WO2018176590A1 - 一种在 wdm 系统中对传输光信号进行安全防护的装置及方法 - Google Patents

一种在 wdm 系统中对传输光信号进行安全防护的装置及方法 Download PDF

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Publication number
WO2018176590A1
WO2018176590A1 PCT/CN2017/084240 CN2017084240W WO2018176590A1 WO 2018176590 A1 WO2018176590 A1 WO 2018176590A1 CN 2017084240 W CN2017084240 W CN 2017084240W WO 2018176590 A1 WO2018176590 A1 WO 2018176590A1
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optical
signal
wdm
wavelength
control
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PCT/CN2017/084240
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English (en)
French (fr)
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王可
张晗
吉建华
徐铭
杨淑雯
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深圳大学
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Publication of WO2018176590A1 publication Critical patent/WO2018176590A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/524—Pulse modulation

Definitions

  • the present invention relates to the field of signal transmission, and more particularly to an apparatus and method for securely protecting transmitted optical signals in a WDM system.
  • the existing WDM optical fiber communication system is composed of a WDM optical transmitter, a WDM optical receiver, and an optical fiber, as shown in FIG.
  • An optical transmitter (1-N) containing N user signals in a WDM optical transmitter forms N conventional single-wavelength optical fiber communication systems, and combines N multiple channels into one optical wave division by a wavelength division multiplexer. Signal output, transmitted to the far end via fiber optics.
  • the remote WDM receiver After receiving the optical wavelength division multiplexing signal, the remote WDM receiver separates N single-wavelength channels by the wave decomposition multiplexer, and each channel is processed by the optical receiver to obtain N user information.
  • Existing WDM fiber-optic communication systems have potential safety hazards that can be eavesdropped.
  • the technical problem to be solved by the present invention is to provide a kind of transmission optical signal in a WDM system that is difficult to be illegally stolen and secure, which is easy to be illegally stolen and insecure in the prior art.
  • Apparatus and method for performing safety protection are provided.
  • the technical solution adopted by the present invention to solve the technical problem is: constructing a device for performing security protection on a transmitted optical signal in a WDM system, including: [0006]
  • the transmitting coding unit is connected between the optical transmitter of the WDM and the transmission fiber, and optically demultiplexes the WDM optical signal into N single-wavelength optical signals, optically codes the obtained optical signals, and Combining the N channels of the optically encoded signals into a WDM optical coded signal, and transmitting the WDM optical coded signal to the transmission fiber; wherein, the carrier wavelength of the coded optical carrier of each channel is different;
  • Receiving a decoding unit receiving the WDM optical coded signal, converting the WDM optical coded signal into an optical signal of the WD M system, and transmitting the optical signal to the optical receiver of the WDM system;
  • a codeword control unit generating a control codeword and transmitting to the transmit coding unit and the receive decoding unit, respectively, wherein the control codeword is used to control parameters of the coded optical carrier of each channel to generate different, corresponding to The coded optical carrier of each channel or control outputs a decoded optical carrier signal of each channel.
  • the coded optical carriers of each channel respectively comprise a plurality of set inter-turn units arranged in sequence, and the wavelength of light in each set inter-turn unit is different from that in the adjacent set inter-turn unit The wavelength of light; the wavelength of the light in the same number of the coded optical carrier of each channel is different.
  • the transmit coding unit further includes a wave decomposition multiplexer, a plurality of light receiving modules, a plurality of light modulation modules, a light source, and a transmit wavelength division multiplexer;
  • the wave decomposition multiplexer includes a An input terminal and a plurality of output terminals connected to an optical transmitter output of the WDM system, wherein the plurality of output ends of the wave decomposition multiplexer are respectively connected to an input end of a light receiving module, and a light receiving module The output end is connected to a modulation signal input end of a light modulation module;
  • the light source comprises a plurality of coded optical carrier signal output ends, and an input end of an optical modulation module is connected to a coded optical carrier signal output end; an output end of the optical modulation module Connected to an input end of the transmitting wavelength division multiplexer, the output end of the transmitting wavelength division multiplexer is connected to a transmission fiber; the number of output terminals of the wave decomposition multiplexer, the number of
  • the light source comprises a broad spectrum light source and an emission wavelength selection switch
  • the emission wavelength selection switch comprises an input end, a control end and a plurality of output ends
  • the wide spectrum light source generates a broad spectrum optical signal
  • the control end of the transmit wavelength selection switch receives the transmit control codeword generated by the codeword control unit as a code conversion control signal, so that the transmit wavelength is selected
  • the plurality of output ends are respectively obtained from the optical signals input by the wide-spectrum light source and respectively outputted in accordance with the The encoded optical carrier signal required to control the codeword is described.
  • the receiving and decoding unit includes a receiving wavelength selection switch, a plurality of optical narrow pulse receiving modules, and a receiving wavelength division multiplexer;
  • the receiving wavelength selection switch includes an input end, a control end, and a plurality of output ends;
  • the input end of the receiving wavelength selection switch is connected to the transmission fiber, and the control end of the receiving wavelength selection switch receives the receiving control code word generated by the code word control unit as a control signal, so that
  • the plurality of output ends of the receiving wavelength selection switch respectively output the modulated coded optical carrier signals output by the optical modulation modules of the transmit coding unit;
  • the plurality of output ends of the receive wavelength selection switches are respectively connected to An input end of the plurality of narrow pulse receiving modules, an output end of an optical narrow pulse receiving module is respectively connected to an input end of the receiving wavelength division multiplexer, and an output end of the receiving wavelength division multiplexer
  • the optical receiver connection of the WDM system is provided to the WDM system.
  • the optical narrow pulse receiving module detects the modulated encoded optical carrier signal received by the optical narrow pulse receiving module, obtains a modulated optical signal, and outputs the modulated optical signal to a corresponding input port of the receiving wavelength division multiplexer.
  • control codeword includes a transmit control codeword and a receive control codeword, and the transmit control codeword and the receive control codeword are respectively sent to the transmit coding unit and the The receiving decoding unit is described.
  • the present invention also relates to a method for security protection of an optical signal transmitted in a WDM system, comprising: after the WDM system outputs the multiplexed optical signal, the optical signal is processed as follows:
  • the WDM system After the WDM system receives the optical signal transmitted on the transmission fiber after the processing, the optical signal is processed as follows:
  • the WDM optical code receives the WDM optical code, demultiplexing the WDM optical code into a modulated coded optical carrier signal of each channel, and performing demodulation to obtain a user optical signal of each channel, and obtaining the obtained channel
  • the user optical signal is multiplexed into an optical signal of the WDM and transmitted to the optical receiver of the WDM system;
  • control codeword is generated and used for the optical signal processing described above, wherein the control codeword is used to control parameters of the coded optical carrier of each channel to generate different coded optical carriers corresponding to each channel or Control The modulated, encoded optical carrier signals of different channels are output.
  • the coded optical carriers of each channel respectively comprise a plurality of set inter-turn units arranged in sequence, and the wavelength of light in each set inter-turn unit is different from that in the adjacent set inter-turn unit The wavelength of light; the wavelength of the light in the same number of the coded optical carrier of each channel is different.
  • the wavelength selection is controlled by controlling the codeword, so that each set wavelength component input to the wavelength selection signal is respectively output to the output end of the wavelength selection switch, thereby obtaining coded light.
  • An apparatus and method for implementing security protection for transmitting optical signals in a WDM system embodying the present invention has the following beneficial effects: It is transmitted after processing an optical signal transmitted on an optical fiber in an existing WDM system. On the optical fiber, the carrier of a user signal changes in the optical signal transmitted on the optical fiber, and the law of variation is determined by the control codeword, so that even if the control codeword is not known, even for the optical fiber. The optical signal on the interception intercepts the optical signal on the optical fiber, and it is impossible to completely demodulate the signal on one channel, so that it is impossible to obtain a user signal. Therefore, it is more difficult to be illegally stolen and the transmission of signals is safer.
  • FIG. 1 is a schematic structural diagram of an apparatus and method for protecting a transmitted optical signal in a WDM system according to an embodiment of the present invention
  • FIG. 2 is a schematic structural view of a transmitting unit in the embodiment
  • FIG. 3 is a schematic structural diagram of a receiving unit in the embodiment.
  • FIG. 4 is a schematic diagram of a first carrier wavelength conversion in one case in the embodiment.
  • FIG. 5 is a flow chart of a method for security protection of transmitted optical signals in a WDM system in the embodiment.
  • FIG. 1 in an embodiment of an apparatus and method for security protection of transmitted optical signals in a WDM system, for an existing WDM system, a light emitter and light in a WDM system
  • the transmission fibers are directly connected between the receivers, and the optical signals transmitted on the transmission fibers are multiplexed signals in the WDM system.
  • the optical transmitter and the optical receiver of the WDM system not only the transmission optical fiber but also the transmission coding unit, the reception decoding unit, and the codeword control unit, and the signal transmitted on the transmission optical fiber are included.
  • it a conventional multiplexed signal, but a new multiplexed signal obtained by processing a conventional multiplexed signal. Even if this signal is illegally obtained, it cannot be decoded because it does not know the control codeword. Therefore, it is possible to protect the transmission content from leakage.
  • the transmission coding unit is connected between the optical transmitter of the WDM and the transmission fiber, and the WDM optical signal is optically demultiplexed into N optical signals of a single wavelength, The obtained optical signals are optically encoded, and the N optically encoded signals are combined into one WDM optical coded signal, and the WDM optical coded signal is transmitted to the transmission optical fiber;
  • N is the WDM optical signal originally The number of channels, in other words, the WDM optical signal is usually obtained by multiplexing N signals; wherein the carrier wavelength of the coded optical carrier of each channel is different; and the input end of the receiving decoding unit and the above transmission fiber Connecting, receiving the WDM optical coded signal, converting the WDM optical coded signal into an optical signal of the WDM system, and transmitting the optical signal to the optical receiver of the WDM system;
  • the codeword control unit is respectively connected to the above-mentioned transmit coding unit and the receive and decode unit, Generating a control codeword and transmitting to the
  • the optical coding includes performing photoelectric conversion on the obtained channel optical signals of the WDM, and separately encoding and modulating optical carriers of the respective channels by using the obtained electrical signals, thereby obtaining each channel.
  • the optical coded signal is obtained by multiplexing the obtained optical coded signals to obtain a WDM optical coded signal.
  • the coded optical carriers of each channel respectively comprise a plurality of set inter-turn units arranged in sequence, and the wavelength of the light in each set of the inter-turn units is different from the adjacent set daytimes.
  • the wavelength of light in the cell; each The wavelengths of the same sequence number of the coded optical carriers of the channels are different in the wavelength of the light in the inter-cell.
  • the multiplexed signal of the WDM system includes multiple channels (ie, multiple user signals, one channel for each user signal), and each channel corresponds to one coded optical carrier, each Although the coded optical carriers of the channel have the same structure, they are sequentially arranged by a plurality of set inter-turn units, but the wavelengths of each coded optical carrier are different, and, in a coded optical carrier, adjacent It is not the same to set the optical carrier in the day unit. The selection of the wavelength of the coded optical carrier and the change of the wavelength in the adjacent set of inter-turn cells are determined by the control codeword.
  • the information content carried by the modulated coded optical carrier can be obtained; and if the control codeword is not known, the first carrier in the current setting unit cannot be predicted.
  • the wavelength does not know the wavelength of the coded optical carrier in the next setting unit, so the information content carried by the modulated coded optical carrier cannot be obtained.
  • the WDM optical transmitter outputs an optical multiplexed signal including optical signals output from a plurality of channels.
  • a wave decomposition multiplexer includes a connection An input end of the optical transmitter output of the WDM system and a plurality of output terminals, wherein the plurality of output ends of the wave decomposition multiplexer are respectively connected to an input end of a light receiving module, and an output of a light receiving module The end is connected to the modulation signal input end of a light modulation module;
  • the light source comprises a plurality of coded optical carrier signal output ends, and the input end of an optical modulation module is connected to a coded optical carrier signal output end;
  • the output end of the optical modulation module is connected And at an input end of the transmitting wavelength division multiplexer,
  • the light source includes a broad spectrum light source and an emission wavelength selection switch
  • the emission wavelength selection switch includes an input end, a control end, and a plurality of output ends
  • the wide spectrum light source generates a broad spectrum optical signal and outputs the The transmitting wavelength selects an input end of the switch
  • the control end of the transmit wavelength selection switch receives the transmit control codeword generated by the codeword control unit as a code conversion control signal, so that the transmit wavelength selects multiple outputs of the switch
  • the ends are respectively obtained from the optical signals input by the wide-spectrum light source and respectively output encoded optical carrier signals that meet the requirements of the control codeword.
  • the signal processing for the transmitting end is a conventional WDM system.
  • the multiplexed signal is demultiplexed, processed to obtain a signal on each channel, and then the user signals (one channel is transmitted by one user signal) on the obtained multiple channels are used as modulation signals to modulate the coded optical carrier corresponding to the channel. signal.
  • there are a plurality of coded optical carrier signals each coded optical carrier signal corresponds to one channel, and each coded optical carrier signal is on the same frame, and the carrier wavelength is different;
  • the wavelength changes every other time during the setting of the inter-turn period; for the wavelength conversion of the encoded optical carrier signal, see Figure 4.
  • An example in which the wavelengths of a plurality of coded optical carrier signals are converted along the inter-turn axis in one case in the present embodiment is shown in FIG.
  • the receiving decoding unit includes a receiving wavelength selection switch, a plurality of optical narrow pulse receiving modules, and a receiving wavelength division multiplexer;
  • the receiving wavelength selection switch includes an input terminal, a control terminal, and a plurality of outputs.
  • the receiving end of the receiving wavelength selection switch is connected to the transmission fiber, and the receiving end of the receiving wavelength selection switch receives the receiving control code word generated by the code word control unit as a control signal, so that the receiving The plurality of output ends of the wavelength selection switch respectively output the modulated coded optical carrier signals output by the optical modulation modules of the transmit coding unit; the plurality of output ends of the receive wavelength selection switches are respectively connected to the plurality of outputs
  • An input end of an optical narrow pulse receiving module, an output end of an optical narrow pulse receiving module is respectively connected to an input end of the receiving wavelength division multiplexer, an output end of the receiving wavelength division multiplexer and the WDM system
  • the light receiver is connected.
  • the narrow pulse receiving module detects the modulated encoded optical carrier signal received therefrom to obtain a modulated optical signal and outputs it to a corresponding input port of the receiving wavelength division multiplexer.
  • the control codeword includes a transmit control codeword and a receive control codeword, and the transmit control codeword and the receive control codeword are respectively sent to the transmit coding unit and the The receiving decoding unit is described.
  • the function of the transmission control codeword and the reception control codeword is such that the above-mentioned transmission wavelength selection and reception wavelength selection are respectively outputting signals at wavelengths corresponding to the set requirements at their different output terminals, so that this is achieved in advance.
  • the foregoing transmit control codeword and the receive control codeword may be the same (may be combined into one control codeword), or may be different, and the specific selection of the transmit wavelength selection and the reception wavelength selection is required. Depending on the situation.
  • the device for performing security protection on the WDM optical transmission signal performs channel separation processing on the optical wavelength division multiplexed signal from the WDM optical transmitter, and each channel is separately received for optical-electrical conversion, and the narrow signal is modulated by the electrical signal.
  • Pulse ie, coded optical carrier signal
  • narrow-light pulse generated by a broad-spectrum supercontinuum source, or generated by a plurality of narrow-width semiconductor gain-dependent lasers of different wavelengths, after wavelength selection (WSS, Wavel ength Selective Switch Module, WSS has one or more input ports, N output ports, controlled by computer, can output any port input light or any part of the input port light to any output port of W SS (port 1 N), one input port can input one or more wavelengths, and one output port can output one or more wavelengths as expected.
  • WSS Wavel ength Selective Switch Module
  • the receiving and decoding unit of the WDM optical transmission signal security protection device is composed of a WSS-Drop wavelength selection switch module, a plurality of optical narrow pulse receiving modules, a wavelength division multiplexer, and a decoding conversion control system (FIG. Not shown in the middle), as shown in Figure 3.
  • the WDM optical code transmitted from the transmission fiber enters the WSS-Drop receiving wavelength selection switch module, and the WSS-Drop receives the wavelength selection switch under the action of the decoding conversion control signal (ie, the reception control code word) sent by the decoding conversion control system.
  • Each output port outputs a single optical carrier, and the wavelength of the carrier is corresponding to the code conversion, so that the wavelength of the single-wave optical signal outputted by each output port (1---N) of the WSS-Drop remains unchanged, and is still ⁇ ⁇ ⁇ 2 , respectively. ..., ⁇ ⁇ .
  • Each signal enters a plurality of narrow-narrow pulse receiving modules, and is restored to each single-channel user signal of a different wavelength, and is multiplexed into a WDM optical signal by a wavelength division multiplexer.
  • the narrow-narrow pulse receiving module sequentially expands the narrow pulse of the light obtained by delaying or expanding, and then returns to the format of the channel optical signal of the WDM and outputs the format.
  • Transform coding is Yaoan control system designed to control the coding rule brightest optical carrier wavelength, as in the first lap ⁇ inches, for the first channel to the second channel are arranged ⁇ different wavelengths person 1 To the person ⁇ In the second inter-turn ⁇ 2 , change the wavelength of each channel; in the third inter-segment 1 3 , change the wavelength of each channel, and so on, as shown in Figure 4.
  • the carrier wavelength changes with time.
  • the determination of the length of the inter-turn, and the selection of its wavelength are determined according to the designed coding transformation law.
  • the segments are not necessarily equal. In this way, the eavesdropper can not obtain the user information by using the spectrum analyzer, so that the system plays a security role.
  • Step S1 l demultiplexes the multiplexed signal of the WDM system to obtain a user signal:
  • the WD is
  • the multiplexed optical signal output by the M system is decomposed and photoelectrically converted according to the channel to obtain a user signal of each channel.
  • Step S12 respectively modulates the obtained user signal to the corresponding coded optical carrier signal, wherein the wavelength of the encoded optical carrier signal varies with the time:
  • the obtained user signals of each channel are respectively for the channel.
  • Encoded optical carrier for modulation wherein, a control codeword is generated and used for optical signal processing in this step and a later step, respectively, and the control codeword is used to control parameters of the coded optical carrier of each channel to generate different, corresponding to The coded optical carrier of each channel or control outputs a modulated, coded optical carrier signal of a different channel.
  • Step S13 multiplexes the obtained plurality of modulated coded optical carrier signals to obtain WDM optical coding: In this step, since a plurality of modulated coded optical carrier signals are generated in the above steps, each channel is modulated. The latter coded optical carrier multiplexing results in WDM optical coding.
  • Step S14 transmits the WDM optical code to the transmission fiber: In this step, the WDM optical code is transmitted to the transmission fiber.
  • Step S15 receives the WDM optical code, and obtains the coded optical carrier signal modulated by the user output:
  • the WDM optical code optical signal
  • the WDM optical code is transmitted on the transmission fiber and then reaches the receiving end, where the WDM Before the optical code has entered the optical receiver of the WDM system, it is processed, that is, the WDM optical code is received, and the WDM optical code is demultiplexed into modulated modulated optical carrier signals of each channel.
  • Step S16 demodulates the output modulated optical carrier signals to obtain respective user signals:
  • the obtained modulated encoded optical carrier signals are demodulated to obtain user signals of respective channels. .
  • Step S17 multiplexes the obtained user signal and outputs it to the optical receiver of the WDM system:
  • the obtained user signals of each channel are multiplexed into WDM optical signals, and transmitted to the optical receiver of the WDM system.
  • the coded optical carriers of each channel respectively comprise a plurality of set inter-turn units arranged in sequence, and the wavelength of the light in each set inter-turn unit is different from the adjacent set inter-turn time.
  • the wavelength of light in the cell; the wavelength of the light in the same number of the coded optical carrier of each channel is different.
  • the code word controls the wavelength selection switch so that each set wavelength component input to the wavelength selection signal is respectively output to the output end of the wavelength selection switch, thereby obtaining a coded optical carrier signal or a modulated coded optical carrier. signal.

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Abstract

本发明涉及一种在WDM系统中对传输光信号进行安全防护的装置，包括：发射编码单元：将WDM光信号进行光波分解复用为N路单一波长的光信号，对得到的各路光信号进行光编码，并将N路经过光编码的信号合为一路WDM光编码信号后传输到传输光纤；接收解码单元：接收所述WDM光编码信号，将WDM光编码信号转换为WDM系统的光信号，传输到WDM系统的光接收器；码字控制单元：产生控制码字并分别传输到所述发射编码单元和接收解码单元。本发明还涉及一种在WDM系统中对传输光信号进行安全防护的方法。实施本发明的一种在WDM系统中对传输光信号进行安全防护的装置及方法，具有以下有益效果：其较难被非法窃取、信号的传输较为安全。

Description

发明名称：一种在 WDM系统中对传输光信号进行安全防护的装置 及方法
技术领域
[0001] 本发明涉及信号传输领域， 更具体地说， 涉及一种在 WDM系统中对传输光信 号进行安全防护的装置及方法。
背景技术
[0002] 已有的 WDM光纤通信系统是由 WDM光发射机、 WDM光接收机和光纤组成， 如图 1所示。 WDM光发射机内含有 N个用户信号的光发射机 （1-N) ， 形成 N个 常规的单波长光纤通信系统， 经波分复用器， 将 N个多路信道合为一路光波分复 用信号输出， 通过光纤传输到远端。 远端 WDM接收机接收到光波分复用信号后 ， 由波分解复用器分离出 N个单波长信道， 各个信道分别经光接收机处理， 获得 N个用户信息。 已有的 WDM光纤通信系统存在可能被窃听的安全隐患， 因为常 规的单波长光纤通信系统工作于 OOK体制， 用能量探测器就能够获取光纤上所 传输的用户信息。 WDM系统中传输了多个用户信息， 提高了系统安全性。 但当 窃听者使用频谱分析仪从 WDM信道中剥离出一个信道， 就仍然能获取用户信息 ， 因而 WDM光纤通信系统仍然是不安全的。
技术问题
[0003] 在此处键入技术问题描述段落。
问题的解决方案
技术解决方案
[0004] 本发明要解决的技术问题在于， 针对现有技术的上述容易被非法窃取信息、 不 安全的缺陷， 提供一种较难被非法窃取、 安全的一种在 WDM系统中对传输光信 号进行安全防护的装置及方法。
[0005] 本发明解决其技术问题所采用的技术方案是： 构造一种在 WDM系统中对传输 光信号进行安全防护的装置， 包括： [0006] 发射编码单元： 连接在 WDM的光发射器和传输光纤之间， 将 WDM光信号进 行光波分解复用为 N路单一波长的光信号， 对得到的各路光信号进行光编码， 并 将 N路经过光编码的信号合为一路 WDM光编码信号， 并将所述 WDM光编码信号 传输到所述传输光纤； 其中， 每个信道的编码光载波的载波波长不相同；
[0007]
接收解码单元： 接收所述 WDM光编码信号， 将所述 WDM光编码信号转换为 WD M系统的光信号， 传输到 WDM系统的光接收器；
[0008] 码字控制单元： 产生控制码字并分别传输到所述发射编码单元和接收解码单 元， 所述控制码字用于控制各信道的编码光载波的参数， 以产生不同的、 对应 于各信道的编码光载波或控制输出不同的、 各信道的解码光载波信号。
[0009] 更进一步地， 每个信道的编码光载波分别包括依次排列的多个设定吋间单元， 每个设定吋间单元中的光波长不同于其相邻的设定吋间单元中的光波长； 每个 信道的编码光载波的相同序号的设定吋间单元中的光波长不同。
[0010] 更进一步地， 所述发射编码单元进一步包括波分解复用器、 多个光接收模块、 多个光调制模块、 光源和发射波分复用器； 所述波分解复用器包括一个连接在 所述 WDM系统的光发射器输出上的输入端和多个输出端， 所述波分解复用器的 多个输出端分别连接在一个光接收模块的输入端上， 一个光接收模块的输出端 连接在一个光调制模块的调制信号输入端； 所述光源包括多个编码光载波信号 输出端， 一个光调制模块的输入端连接在一个编码光载波信号输出端； 光调制 模块的输出端连接在所述发射波分复用器的输入端， 所述发射波分复用器的输 出端与传输光纤连接； 所述波分解复用器的输出端个数、 光接收模块个数、 光 调制模块个数、 编码光载波输出端个数和发射波分复用模块的输入端个数相等
[0011] 更进一步地， 所述光源包括宽谱光源和发射波长选择幵关， 所述发射波长选择 幵关包括输入端、 控制端和多个输出端； 所述宽谱光源产生宽谱光信号并输出 到所述发射波长选择幵关的输入端， 所述发射波长选择幵关的控制端接收码字 控制单元产生的发射控制码字作为编码变换控制信号， 使得所述发射波长选择 幵关的多个输出端分别由所述宽谱光源输入的光信号中得到并分别输出符合所 述控制码字要求的编码光载波信号。
[0012] 更进一步地， 所述接收解码单元包括接收波长选择幵关、 多个光窄脉冲接收模 块和接收波分复用器； 所述接收波长选择幵关包括一个输入端、 一个控制端和 多个输出端； 所述接收波长选择幵关的输入端和所述传输光纤连接， 所述接收 波长选择幵关的控制端接收所述码字控制单元产生的接收控制码字作为控制信 号， 使得所述接收波长选择幵关的多个输出端分别输出所述发射编码单元中各 光调制模块输出的、 已调制的编码光载波信号； 所述接收波长选择幵关的多个 输出端分别连接到所述多个光窄脉冲接收模块的输入端， 一个光窄脉冲接收模 块的输出端分别连接到所述接收波分复用器的输入端， 所述接收波分复用器的 输出端与所述 WDM系统的光接收器连接。
[0013] 更进一步地， 所述光窄脉冲接收模块对其接收到的已调制的编码光载波信号进 行检波， 得到调制的光信号并输出到所述接收波分复用器的相应输入端口上。
[0014] 更进一步地， 所述控制码字包括发射控制码字和接收控制码字， 所述发射控制 码字和所述接收控制码字分别通过独立的光纤输送到所述发射编码单元和所述 接收解码单元。
[0015] 本发明还涉及一种对 WDM系统中传输的光信号安全防护的方法， 包括在 WDM 系统输出复用的光信号后， 对该光信号进行如下处理：
[0016] 将 WDM的光信号按照信道进行分解和光电转换， N路单一波长的光信号， 对 得到的各路光信号进行光编码； 将各信道调制后的编码光载波复用得到 WDM光 编码， 并将所述 WDM光编码传输到所述传输光纤； 其中， 每个信道的编码光载 波的载波波长不相同；
[0017] 在 WDM系统接收到上述经处理后在传输光纤上传输的光信号后， 对该光信 号进行如下处理：
[0018] 接收所述 WDM光编码， 将所述 WDM光编码解复用为各信道的调制后的编码光 载波信号， 并进行解调制， 得到各信道的用户光信号， 将得到的各信道的用户 光信号复用为 WDM的光信号， 传输到 WDM系统的光接收器；
[0019] 其中， 产生控制码字并分别用于上述的光信号处理， 所述控制码字用于控制 各信道的编码光载波的参数， 以产生不同的、 对应于各信道的编码光载波或控 制输出不同的、 各信道的已调制的编码光载波信号。
[0020] 更进一步地， 每个信道的编码光载波分别包括依次排列的多个设定吋间单元， 每个设定吋间单元中的光波长不同于其相邻的设定吋间单元中的光波长； 每个 信道的编码光载波的相同序号的设定吋间单元中的光波长不同。
[0021] 更进一步地， 通过控制码字控制波长选择幵关， 使得输入到该波长选择幵关的 信号中的各设定波长分量分别输出到该波长选择幵关的输出端， 从而得到编码 光载波信号或调制后的编码光载波信号。
发明的有益效果
有益效果
[0022] 实施本发明的一种在 WDM系统中对传输光信号进行安全防护的装置及方法， 具有以下有益效果： 由于对现有的 WDM系统中在光纤上传输的光信号进行处理 后才传输到光纤上， 使得在光纤上传输的光信号中， 一个用户信号的载波是变 化的， 而且变化的规律是由控制码字决定的， 这样， 在不知道控制码字的情况 下， 即使对光纤上的光信号进行了拦截， 取得了光纤上的光信号， 也不可能完 整地解调一个信道上的信号， 进而不可能得到一个用户信号。 所以， 其较难被 非法窃取、 信号的传输较为安全。
对附图的简要说明
附图说明
[0023] 图 1是本发明一种在 WDM系统中对传输光信号安全防护的装置及方法实施例的 该装置的结构示意图；
[0024] 图 2是所述实施例中发射单元的结构示意图；
[0025] 图 3是所述实施例中接收单元的结构示意图；
[0026] 图 4是所述实施例中一种情况下第一载波波长变换的示意图；
[0027] 图 5是所述实施例中一种在 WDM系统中对传输光信号安全防护的方法流程图。
实施该发明的最佳实施例
本发明的最佳实施方式
[0028] 在此处键入本发明的最佳实施方式描述段落。 本发明的实施方式
[0029] 下面将结合附图对本发明实施例作进一步说明。
[0030] 如图 1所示， 在本发明的一种在 WDM系统中对传输光信号进行安全防护的装置 及方法实施例中， 对于现有 WDM系统而言， 在 WDM系统的光发射器和光接收 器之间， 直接连接传输光纤， 且传输光纤上传输的光信号就是 WDM系统中的复 用信号。 而在图 1中， 在 WDM系统的光发射器和光接收器之间， 不仅仅包括传 输光纤， 还包括发射编码单元、 接收解码单元以及码字控制单元， 同吋， 在传 输光纤上传输的信号也不是传统的复用信号， 而是对传统的复用信号进行处理 后， 得到的新的复用信号， 这种信号即使被非法取得， 由于不知道控制码字， 因而不能被解码。 因此能够起到保护传输内容不外泄的作用。
[0031] 在本实施例中， 如图 1所示， 发射编码单元连接在 WDM的光发射器和传输光纤 之间， 将 WDM光信号进行光波分解复用为 N路单一波长的光信号， 对得到的各 路光信号进行光编码， 并将 N路经过光编码的信号合为一路 WDM光编码信号， 并将所述 WDM光编码信号传输到所述传输光纤； N是 WDM光信号中原先就具有 的信道数量， 换句话说， WDM光信号通常是由 N路信号复用后得到的； 其中， 每个信道的编码光载波的载波波长不相同； 而接收解码单元的输入端与上述传 输光纤连接， 接收所述 WDM光编码信号， 将所述 WDM光编码信号转换为 WDM 系统的光信号， 传输到 WDM系统的光接收器； 码字控制单元分别与上述发射编 码单元和接收解码单元连接， 产生控制码字并分别传输到所述发射编码单元和 接收解码单元， 所述控制码字用于控制各信道的编码光载波的参数， 以产生不 同的、 对应于各信道的编码光载波或控制输出不同的、 各信道的已调制的编码 光载波信号。 值得一提的是， 在本实施例中， 上述光编码包括了将得到的 WDM 的信道光信号进行光电转换， 利用得到的电信号分别对各信道的光载波进行编 码调制， 从而得到每个信道的光编码信号； 将得到的各路光编码信号复用后， 得到 WDM光编码信号。
[0032] 在本实施例中， 每个信道的编码光载波分别包括依次排列的多个设定吋间单元 ， 每个设定吋间单元中的光波长不同于其相邻的设定吋间单元中的光波长； 每 个信道的编码光载波的相同序号的设定吋间单元中的光波长不同。 换句话说， 在本实施例中， WDM系统的复用信号中包括多个信道 （即多个用户信号， 每个 用户信号使用一个信道） ， 每个信道均对应于一个编码光载波， 每个信道的编 码光载波虽然其结构相同， 都是由多个设定吋间单元依次排列而成， 但是每个 编码光载波的波长是不同的， 同吋， 在一个编码光载波中， 相邻的设定吋间单 元中的光载波是不相同的。 而编码光载波的波长的选择和相邻设定吋间单元中 波长的变化， 是由控制码字决定的。 在知道控制码字的情况下， 也就能够得到 取得调制后的编码光载波携带的信息内容； 而在不知道控制码字的情况下， 由 于无法预测当前设定吋间单元内第一载波的波长， 也不知道下一个设定吋间单 元内编码光载波的波长， 因而无法得到该调制后的编码光载波携带的信息内容
[0033] 在本实施例中， WDM光发射器输出的是光复用信号， 其中包括了多个信道输 出的光信号。 在上述发射编码单元中， 请参见图 2， 包括波分解复用器、 多个光 接收模块、 多个光调制模块、 光源和发射波分复用器； 所述波分解复用器包括 一个连接在所述 WDM系统的光发射器输出上的输入端和多个输出端， 所述波分 解复用器的多个输出端分别连接在一个光接收模块的输入端上， 一个光接收模 块的输出端连接在一个光调制模块的调制信号输入端； 所述光源包括多个编码 光载波信号输出端， 一个光调制模块的输入端连接在一个编码光载波信号输出 端； 光调制模块的输出端连接在所述发射波分复用器的输入端， 所述发射波分 复用器的输出端与传输光纤连接； 所述波分解复用器的输出端个数、 光接收模 块个数、 光调制模块个数、 编码光载波输出端个数和发射波分复用模块的输入 端个数相等。 在本实施例中， 光源包括宽谱光源和发射波长选择幵关， 所述发 射波长选择幵关包括输入端、 控制端和多个输出端； 所述宽谱光源产生宽谱光 信号并输出到所述发射波长选择幵关的输入端， 所述发射波长选择幵关的控制 端接收码字控制单元产生的发射控制码字作为编码变换控制信号， 使得所述发 射波长选择幵关的多个输出端分别由所述宽谱光源输入的光信号中得到并分别 输出符合所述控制码字要求的编码光载波信号。
[0034] 总体上来讲， 在本实施例中， 对于发射端的信号处理就是将传统的 WDM系统 的复用信号解复用， 经过处理得到每个信道上的信号， 再将得到的多个信道上 的用户信号 （一个信道传输一个用户信号） 作为调制信号， 去调制该信道对应 的编码光载波信号。 也就是说， 在本实施例中， 有多个编码光载波信号， 每个 编码光载波信号对应于一个信道， 每个编码光载波信号在同一个吋间上， 其载 波波长不同； 同吋， 对于一个编码光载波信号而言， 其波长每隔一个设定吋间 周期， 都会变化一次； 对编码光载波信号的波长变换情况， 请参见图 4。 图 4中 给出了本实施例中一种情况下， 多个编码光载波信号的波长沿吋间轴变换的例 子。
[0035] 图 3示出了本实施例中接收解码单元的结构示意图。 在本实施例中， 接收解码 单元包括接收波长选择幵关、 多个光窄脉冲接收模块和接收波分复用器； 所述 接收波长选择幵关包括一个输入端、 一个控制端和多个输出端； 所述接收波长 选择幵关的输入端和所述传输光纤连接， 所述接收波长选择幵关的控制端接收 所述码字控制单元产生的接收控制码字作为控制信号， 使得所述接收波长选择 幵关的多个输出端分别输出所述发射编码单元中各光调制模块输出的、 已调制 的编码光载波信号； 所述接收波长选择幵关的多个输出端分别连接到所述多个 光窄脉冲接收模块的输入端， 一个光窄脉冲接收模块的输出端分别连接到所述 接收波分复用器的输入端， 所述接收波分复用器的输出端与所述 WDM系统的光 接收器连接。 所述光窄脉冲接收模块对其接收到的已调制的编码光载波信号进 行检波， 得到调制的光信号并输出到所述接收波分复用器的相应输入端口上。
[0036] 在本实施例中， 控制码字包括发射控制码字和接收控制码字， 所述发射控制码 字和所述接收控制码字分别通过独立的光纤输送到所述发射编码单元和所述接 收解码单元。 发射控制码字和接收控制码字的作用是使得上述发射波长选择幵 关和接收波长选择幵关分别在其不同的输出端上输出符合设定要求的波长的信 号， 所以， 只要事先实现这一目的， 在本实施例中， 上述发射控制码字和接受 控制码字可以相同 （可以合并为一个控制码字） ， 也可以不同， 需要视上述发 射波长选择幵关和接收波长选择幵关的具体情况而定。
[0037] 对 WDM光传输信号进行安全防护的装置将来自 WDM光发射器的光波分复用信 号进行信道分离处理后， 各信道分别接收进行光-电转换， 用此电信号调制窄光 脉冲 （即编码光载波信号） ， 窄光脉冲由宽谱超连续光源产生， 或由多个不同 波长的窄脉宽半导体增益幵关激光器组产生， 经过波长选择幵关 (WSS , Wavel ength Selective Switch) 模块， WSS有一个或多个输入端口、 N个输出端口， 由计 算机控制， 可以将任意端口输入的光或输入端口输入的光的任意部分， 输出到 W SS的任意输出端口 （端口 1-N) ， 一个输入端口可以输入一个或多个波长， 一个 输出端口可以输出预期的一个或多个波长。 控制 WSS各个输出端口的波长， 即 可转换信道的光载波。 使各信道的光载波随吋间进行跳频变化， 变化规律将遵 循所设计的码字。
[0038] 在本实施例中， WDM光传输信号安全防护装置的接收解码单元由 WSS-Drop波 长选择幵关模块、 多个光窄脉冲接收模块、 波分复用器、 解码变换控制系统 （ 图中未示出） 等组成， 如图 3所示。 自传输光纤传输来的 WDM光编码进入 WSS- Drop接收波长选择幵关模块， 在解码变换控制系统发出的解码变换控制信号 （ 即接收控制码字） 作用下， WSS-Drop接收波长选择幵关的各个输出端口输出单 个光载波， 此载波波长与编码变换的相应， 使 WSS-Drop各个输出端口 （1---N) 输出的单波光信号的波长保持不变， 仍然分别为 λ ρ λ 2、 …、 λ Ν。 各路信号分 别进入多个光窄脉冲接收模块， 还原为原不同波长的各单路用户信号， 经波分 复用器复用为 WDM光信号。 其中， 在需要的吋候， 上述光窄脉冲接收模块将其 得到的光窄脉冲采用延吋或扩展的手段依次展宽后， 使其恢复到 WDM的信道光 信号的格式后输出。
[0039] 编码变换控制系统是要按所设计的编码规则来控制各路光载波波长， 如在第一 个吋间段^内， 对第 1信道至第 Ν个信道分别配置不同的波长人1至人^ 在第 2个吋 间段 τ 2内， 改变各信道的波长； 第 3个吋间段1 3内， 再改变各信道的波长， 依此 类推， 如图 4所示。 对任何一个信道， 载波波长随吋间而改变。 吋间段长短的确 定， 及其波长的选取是依据所设计的编码变换规律确定。 各吋间段不一定相等 。 这样， 窃听者用频谱分析仪就不能获取到用户信息， 从而系统起到安全防护 作用。
[0040] 请参见图 5， 在本实施例中还涉及一种对 WDM系统中传输的光信号安全防护的 方法， 包括如下步骤： [0041] 步骤 Sl l将 WDM系统的复用信号解复用， 得到用户信号： 在本步骤中， 将 WD
M系统输出的复用光信号按照信道进行分解和光电转换， 得到各信道的用户信号
[0042] 步骤 S12将得到的用户信号分别调制对应的编码光载波信号， 其中， 编码光载 波信号的波长随吋间变化： 在本步骤中， 将得到的各信道的用户信号分别对该 信道的编码光载波进行调制； 其中， 产生控制码字并分别用于本步骤和稍后步 骤中的光信号处理， 控制码字用于控制各信道的编码光载波的参数， 以产生不 同的、 对应于各信道的编码光载波或控制输出不同的、 各信道的已调制的编码 光载波信号。
[0043] 步骤 S13将得到的多个调制后的编码光载波信号复用得到 WDM光编码： 在本步 骤中， 由于上述步骤中产生了多个已调制的编码光载波信号， 所以将各信道调 制后的编码光载波复用得到 WDM光编码。
[0044] 步骤 S 14将 WDM光编码传输到传输光纤上： 在本步骤中， 将所述 WDM光编码 传输到所述传输光纤。
[0045] 步骤 S15接收 WDM光编码， 并得到按用户输出调制后的编码光载波信号： 在本 步骤中， 上述 WDM光编码 （光信号） 在传输光纤上传输后到达接收端， 在该 W DM光编码还没有进入 WDM系统的光接收器之前， 对其进行处理， 即接收所述 WDM光编码， 将所述 WDM光编码解复用为各信道的调制后的编码光载波信号
[0046] 步骤 S16对输出的各个调制后的编码光载波信号解调， 得到各用户信号： 在本 步骤中， 对得到的各调制后的编码光载波信号进行解调制， 得到各信道的用户 信号。
[0047] 步骤 S17复用得到的用户信号并输出到 WDM系统的光接收器： 在本步骤中， 将 得到的各信道的用户信号复用为 WDM的光信号， 传输到 WDM系统的光接收器
[0048] 在本实施例中， 每个信道的编码光载波分别包括依次排列的多个设定吋间单 元， 每个设定吋间单元中的光波长不同于其相邻的设定吋间单元中的光波长； 每个信道的编码光载波的相同序号的设定吋间单元中的光波长不同。 通过控制 码字控制波长选择幵关， 使得输入到该波长选择幵关的信号中的各设定波长分 量分别输出到该波长选择幵关的输出端， 从而得到编码光载波信号或调制后的 编码光载波信号。
[0049] 以上所述实施例仅表达了本发明的几种实施方式， 其描述较为具体和详细， 但 并不能因此而理解为对本发明专利范围的限制。 应当指出的是， 对于本领域的 普通技术人员来说， 在不脱离本发明构思的前提下， 还可以做出若干变形和改 进， 这些都属于本发明的保护范围。 因此， 本发明专利的保护范围应以所附权 利要求为准。
工业实用性
[0050] 在此处键入工业实用性描述段落。
序列表自由内容
[0051] 在此处键入序列表自由内容描述段落。

Claims

权利要求书
[权利要求 1] 一种在 WDM系统中对传输光信号进行安全防护的装置， 其特征在于
， 包括： 发射编码单元： 连接在 WDM的光发射器和传输光纤之间， 将 WDM 光信号进行光波分解复用为 N路单一波长的光信号， 对得到的各路光 信号进行光编码， 并将 N路经过光编码的信号合为一路 WDM光编码 信号， 并将所述 WDM光编码信号传输到所述传输光纤； 其中， 每个 信道的编码光载波的载波波长不相同；
接收解码单元： 接收所述 WDM光编码信号， 将所述 WDM光编码 信号转换为 WDM系统的光信号， 传输到 WDM系统的光接收器； 码字控制单元： 产生控制码字并分别传输到所述发射编码单元和接 收解码单元， 所述控制码字用于控制各信道的编码光载波的参数， 以 产生不同的、 对应于各信道的编码光载波或控制输出不同的、 各信道 的解码光载波信号。
[权利要求 2] 根据权利要求 1所述的在 WDM系统中对传输光信号进行安全防护的装 置， 其特征在于， 每个信道的编码光载波分别包括依次排列的多个设 定吋间单元， 每个设定吋间单元中的光波长不同于其相邻的设定吋间 单元中的光波长； 每个信道的编码光载波的相同序号的设定吋间单元 中的光波长不同。
[权利要求 3] 根据权利要求 2所述的在 WDM系统中对传输光信号进行安全防护的装 置， 其特征在于， 所述发射编码单元进一步包括波分解复用器、 多个 光接收模块、 多个光调制模块、 光源和发射波分复用器； 所述波分解 复用器包括一个连接在所述 WDM系统的光发射器输出上的输入端和 多个输出端， 所述波分解复用器的多个输出端分别连接在一个光接收 模块的输入端上， 一个光接收模块的输出端连接在一个光调制模块的 调制信号输入端； 所述光源包括多个编码光载波信号输出端， 一个光 调制模块的输入端连接在一个编码光载波信号输出端； 光调制模块的 输出端连接在所述发射波分复用器的输入端， 所述发射波分复用器的 输出端与传输光纤连接； 所述波分解复用器的输出端个数、 光接收模 块个数、 光调制模块个数、 编码光载波输出端个数和发射波分复用模 块的输入端个数相等。
[权利要求 4] 根据权利要求 3所述的在 WDM系统中对传输光信号进行安全防护的装 置， 其特征在于， 所述光源包括宽谱光源和发射波长选择幵关， 所述 发射波长选择幵关包括输入端、 控制端和多个输出端； 所述宽谱光源 产生宽谱光信号并输出到所述发射波长选择幵关的输入端， 所述发射 波长选择幵关的控制端接收码字控制单元产生的发射控制码字作为编 码变换控制信号， 使得所述发射波长选择幵关的多个输出端分别由所 述宽谱光源输入的光信号中得到并分别输出符合所述控制码字要求的 编码光载波信号。
[权利要求 5] 根据权利要求 4所述的在 WDM系统中对传输光信号进行安全防护的装 置， 其特征在于， 所述接收解码单元包括接收波长选择幵关、 多个光 窄脉冲接收模块和接收波分复用器； 所述接收波长选择幵关包括一个 输入端、 一个控制端和多个输出端； 所述接收波长选择幵关的输入端 和所述传输光纤连接， 所述接收波长选择幵关的控制端接收所述码字 控制单元产生的接收控制码字作为控制信号， 使得所述接收波长选择 幵关的多个输出端分别输出所述发射编码单元中各光调制模块输出的 、 已调制的编码光载波信号； 所述接收波长选择幵关的多个输出端分 别连接到所述多个光窄脉冲接收模块的输入端， 一个光窄脉冲接收模 块的输出端分别连接到所述接收波分复用器的输入端， 所述接收波分 复用器的输出端与所述 WDM系统的光接收器连接。
[权利要求 6] 根据权利要求 5所述的在 WDM系统中对传输光信号进行安全防护的装 置， 其特征在于， 所述光窄脉冲接收模块对其接收到的已调制的编码 光载波信号进行检波， 得到调制的光信号并输出到所述接收波分复用 器的相应输入端口上。
[权利要求 7] 根据权利要求 6所述的在 WDM系统中对传输光信号进行安全防护的装 置， 其特征在于， 所述控制码字包括发射控制码字和接收控制码字， 所述发射控制码字和所述接收控制码字分别通过独立的光纤输送到所 述发射编码单元和所述接收解码单元。
[权利要求 8] —种对 WDM系统中传输的光信号进行安全防护的方法， 其特征在于
， 包括在 WDM系统输出复用的光信号后， 对该光信号进行如下处理 将 WDM的光信号按照信道进行分解和光电转换， N路单一波长的光 信号， 对得到的各路光信号进行光编码； 将各信道调制后的编码光载 波复用得到 WDM光编码， 并将所述 WDM光编码传输到所述传输光 纤； 其中， 每个信道的编码光载波的载波波长不相同；
在 WDM系统接收到上述经处理后在传输光纤上传输的光信号后， 对该光信号进行如下处理：
接收所述 WDM光编码， 将所述 WDM光编码解复用为各信道的调制 后的编码光载波信号， 并进行解调制， 得到各信道的用户光信号， 将 得到的各信道的用户光信号复用为 WDM的光信号， 传输到 WDM系 统的光接收器；
其中， 产生控制码字并分别用于上述的光信号处理， 所述控制码字 用于控制各信道的编码光载波的参数， 以产生不同的、 对应于各信道 的编码光载波或控制输出不同的、 各信道的已调制的编码光载波信号
[权利要求 9] 根据权利要求 8所述的方法， 其特征在于， 每个信道的编码光载波分 别包括依次排列的多个设定吋间单元， 每个设定吋间单元中的光波长 不同于其相邻的设定吋间单元中的光波长； 每个信道的编码光载波的 相同序号的设定吋间单元中的光波长不同。
[权利要求 10] 根据权利要求 9所述的方法， 其特征在于， 通过控制码字控制波长选 择幵关， 使得输入到该波长选择幵关的信号中的各设定波长分量分别 输出到该波长选择幵关的输出端， 从而得到编码光载波信号或调制后 的编码光载波信号。
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