CN106100737B - Method and apparatus for sending signal in point-to-point configuration - Google Patents

Method and apparatus for sending signal in point-to-point configuration Download PDF

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Publication number
CN106100737B
CN106100737B CN201610533456.3A CN201610533456A CN106100737B CN 106100737 B CN106100737 B CN 106100737B CN 201610533456 A CN201610533456 A CN 201610533456A CN 106100737 B CN106100737 B CN 106100737B
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signal
olt
downlink
uplink
optical
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CN106100737A (en
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E.戈特瓦尔德
S.斯莫洛尔茨
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Xiaoyang Network Co Ltd
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Xiaoyang Network Co Ltd
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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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2589—Bidirectional transmission
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • 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
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • H04B10/25752—Optical arrangements for wireless networks
    • H04B10/25753—Distribution optical network, e.g. between a base station and a plurality of remote units
    • 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
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H04L27/2096—Arrangements for directly or externally modulating an optical carrier
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0278—WDM optical network architectures
    • H04J14/0282—WDM tree architectures
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0298—Wavelength-division multiplex systems with sub-carrier multiplexing [SCM]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention relates to the method and apparatus for sending signal in point-to-point configuration.Bi-direction data signal is exchanged between center cell and multiple network terminals.Data-signal (DS1-DS10) is modulated to subcarrier (ω by the modulator unit (MOD_OLT) of the center cell1- ω10) on, two optics single sideband singals (LSB) and (USB) are generated, and combine two sideband signals using the carrier signal (CW, CWI) Jing Guo 180 ° of phase shifts.The optical network unit selects its associated downlink signal and generates associated uplink signal.The frequency of the downlink signal and uplink signal is selected such that reflection will not be interfered with signals selected at optical network unit, and will not interfere with the uplink signal received at center cell.

Description

Method and apparatus for sending signal in point-to-point configuration
The application is the divisional application for the application for a patent for invention that national application number is 200880132856.7, the patent of invention The applying date of application be on December 30th, 2008, it is entitled " in point-to-point configuration send signal method and Device ".
Technical field
The present invention relates to a kind of for sending the method and apparatus (arrangement) of signal in point-to-point configuration.
Background technique
Point-to-multipoint delivery network (such as passive optical network (PON)) includes center cell (OLT) and passes through optical fiber The optical network unit (ONU) of connection.Usually as time diversity multiplex (TDM) on the down direction from OLT to ONU Signal sends data-signal, and usually as the burst signal of time multiplexing on the up direction from ONU to OLT To send data-signal.Time division multiplexing on down direction, which is sent, needs complexity with the burst mode transmission on up direction Time management, and burst mode transmission lead to lower data rate.
Katsuimi Takano, N. Hanzawa, S. Tanji and K. Nakagawa are in " Experimental Demonstration of Optically Phase-Shifted SSB Modulation with Fiber-Based Optical Hubert Transformers", National Fiber Optic Engineers Conference, OSA Technical Digest Series (CD) (Optical Society of America, 2007) , paper It is described in JThA48.
Summary of the invention
Therefore, it is an object of the present invention to provide one kind for utilizing high data in two directions with reasonable cost The point-to-point configuration of rate progress bi-directional data transmission.
According to the present invention, it provides a kind of for being sent out between center cell and multiple network units in point-to-point configuration The method for sending data-signal, wherein having following steps in the center cell: first group of signal modulation is carried to first group of pair On wave；Institute's modulating subcarrier signal in first group of combination (combine)；By second group of signal modulation to second group of subcarrier On；Combine institute's modulating subcarrier signal in second group；Generate the lower single-side belt including optical carrier and first group of downlink signal Optical signalling；Generate the upper single-side belt optical signalling (USB) including identical optical carrier and second group of downlink signal；By two Single-side belt (sideband) signal is combined into transmission signal, wherein obtaining 180 ° of phase differences of their optical carrier signal；It will The transmission signal is sent to network unit；And it is selected in optical network unit and demodulates associated downlink signal.
Such modulation reduces implementation cost, and passes through the combination of single sideband singal and suppressed optical carrier Improve frequency spectrum and power efficiency.
Preferably, the optical network unit generates optics uplink signal, and optical carrier is assigned to received Downlink signal.
It is also advantageous that being tuned to the continuous wave light source in the optical network unit, so as to associated Downlink signal carries out coherent demodulation and selection, and the carrier frequency to determine uplink signal.
Identical CW frequency be used in ONU so as to received associated downlink signal carry out demodulation and by Carrier frequency as ONU uplink signal, and optics uplink signal generated can be readily recognized at OLT.
It is advantageously modulated using subcarrier phase or phase difference, this is because in high receiver sensitivity and ONU The simplicity that uplink signal generates.
The method is sent suitable for bi-directional data, wherein downlink signal and uplink signal are sent by single fiber, and The frequency of downlink signal and the carrier wave of uplink signal are selected such that downlink signal and uplink signal are being converted into electricity respectively After subband signal (electrical subband signal), reflection signal will not be interfered with the signal.
It is improved further in the case where the method is below: the subcarrier of downlink signal and the subcarrier of uplink signal It is selected such that after converting the signal into subband signal, the harmonic frequency of the subcarrier signal will not be with other Signal interferes.
These features avoid as reflection and harmonic distortion and caused by damage, and allow to carry out on single fiber high Qualitative data is sent.
One is also provided for passing through single fiber between center cell and multiple network units in point-to-point configuration The preferred embodiment for sending signal, includes: first group of subband modulator in the modulation unit of OLT transmitter, data is believed It number is modulated on first group of electricity subcarrier；Institute's modulating subcarrier signal is combined into the first subband by the first combiner；Second group Subband modulator, will be in data signal modulation to second group of electricity subcarrier；Second combiner, institute's modulating subcarrier signal It is combined into the second subband；First single side-band modulator receives first subband to be used for modulated optical carrier wave and generate First single sideband singal；Second single side-band modulator, receive second subband with for modulate the optical carrier and Generate the second single sideband singal；Delay element generates 180 ° of phase shifts between the carrier wave of the single sideband singal；And addition Two single sideband singals are combined into transmission signal by device (adder).
The generation of single sideband singal including multiple subcarrier signals reduces the workload of technical aspect.In addition, passing through Generating and combine two single sideband singals and eliminating optical carrier in the case where no any optical filter reduces into This.
According to the technical restriction of mixer (hybrid), it may be necessary to which the multiple mixers of application are so as to for each data Hilbert transformation, and the other combiner of application is individually performed to combine the equiphase component of the data-signal in signal.
Other favorable characteristics of the method and device are described in the dependent claims.
Detailed description of the invention
Of the invention example of the description including currently preferred embodiment with reference to the accompanying drawings, in which:
Fig. 1 shows the simplified block diagram of PON system；
Fig. 2 shows the simplified embodiments of OLT transmitter according to the present invention；
Fig. 3 shows the second embodiment of OLT transmitter；
Fig. 4 shows one embodiment of the generation of subcarrier and modulated signal in OLT transmitter；
Fig. 5 shows the simplified illustration of optical modulator；
Fig. 6 shows improved OLT optical modulation unit；
Fig. 7 shows the frequency diagram sent by the bi-directional data of single fiber；
Fig. 8 shows the simplified embodiment of ONU transceiver；
Fig. 9 shows the sub-bands of frequencies figure in the electrical domain (electrical domain) of different ONU；
Figure 10 shows the simplified embodiment of OLT transceiver；
Figure 11 shows the sub-bands of frequencies figure in the electrical domain of OLT；And
Figure 12 shows one embodiment of advanced (advanced) OLT.
Specific embodiment
Fig. 1 shows the passive optical network PON of an example as point-to-point configuration.Center cell OLT(optics Line terminal) it is directly connected to multiple optical network unit ONU1-ONU10 or is attached thereto by Metropolitan Area Network (MAN) MN.Each ONU Common optical fiber FI is connected to by deconcentrator (line-splitter) LSP.For the bi-directional data between OLT and each ONT Transmission is usually using one or two optical fiber FI.Each ONU passes through OLT and communicates with each other.
Fig. 2 shows the modulation unit MOD_OLT of OLT transmitter comprising subcarrier modulator (such as phase-modulator PM1-PM10), continuous wave source LA and two single side-band modulators SSM_L and SSM_U.First group of data-signal DS1-DS5 It is modulated onto subcarrier ω1、ω3、…、ω9On.Institute's modulating subcarrier letter is combined by power divider or wavelength division multiplexer COL Number DB1, DB3 ..., DB9, and obtained lower subcarrier band (lower subcarrier-band) SBL is fed to One single side-band modulator SSM_L.Second group of data-signal DS6-DS10 is modulated onto subcarrier ω2、ω4、…、ω10On.It is logical Cross combiner COU combination institute's modulating subcarrier signal DB2, DB4 ..., DB10, and upper subcarrier band SBU is fed to the Two single side-band modulator SSM_U.
Optical carrier signal CW(carrier frequency f is generated by continuous wave source (laser) LAC) and be fed to two Single side-band modulator.Optics single side-band modulator SSM_L and SSM_U generate different single sideband singals, that is, include that odd number pair carries The lower sideband signal LSB of wave signal and upper side band signal USB including even sub-carriers signal.One sideband signals (such as USB) postponed 180 ° of (phase shift) about described carrier signal by (tunable) delay line or phase shifter TD.Then in adder Two sidebands are combined into double-side band in (power divider) AD and send signal DST.It is important that the carrier wave of two sideband signals There is 180 ° of phase difference between CW and CWI, carrier power is reduced to by this to be substantially zero.
Fig. 3 show using each subcarrier mixer H1, H3 ... modulation unit MOD2_OLT second embodiment. It illustrate only the device for generating lower sideband LSB.It is converted according to Hilbert, from institute modulating subcarrier signal DB1-DB9 Export SBL_0 ° and SBL_90 ° of modulated signal component with 90 ° of phase shifts.Pass through other two combiner COM11 and COM12 group Close all modulated signals with same phase component.SBL_0 ° and SBL_90 ° of obtained subband signal component represents lower pair Carrier frequency band SBL.Two SBL_0 ° and SBL_90 ° of obtained modulated signal components all by as SBL_0 ° of modulated signal and SBL_90 ° is fed to the first single side-band modulator SSM-L for modulating carrier signal CW.
The single side-band modulator has Mach-Zehnder interferometer structure.Such as it is obtained by different bias voltages Obtain the necessary phase difference between the optical carrier signal in the upper and lower branch of the single side-band modulator.
Upper subband SBU is generated in identical device, and lower subband is added by adder AD.
Of course, it is possible to which application generates all common methods of single sideband singal.About the present invention, it is important that by identical Continuous wave light source (mainly laser source) provides the optical carrier of two single side-band modulators, and adds 180 ° of phase difference. As a result, optical carrier is eliminated, so that signal energy is only contained in the portions of the spectrum of carry information, and for For the general modulation compared with low modulation index, most of energy will be comprised in carrier wave.
Fig. 4 shows another OLT modulation unit MOD3_OLT for generating electric subcarrier and modulated signal.First by Data-signal DS1-DS10 is modulated to from common electrical subcarrier signal ω by modulator PM1-PM10ECDerived each subcarrier On.Then institute's modulation signal feeds to other modulator M1-M10(frequency mixer, multiplier or frequency converter), and By applying different conversion signal ωCO1-10It is converted.Subcarrier signal DB1- is exported from filter FI1-FI10 DB10.Combiner COL and COU combine each subcarrier signal as previously mentioned.Mixer HL and HU receive each subcarrier band, and And modulated signal I, Q according to Hilbert transformation output Jing Guo phase shift.
Fig. 5 shows the simplified embodiment of optical modulator, has the first separator for receiving continuous wave signal CW (splitter) SP1, two optical branchings BR1, the BR2 controlled by electrical modulation signal u1, u2, and the institute of combination Liang Ge branch Second separator SP2(combiner of modulated optical signal).
Inferior division BR2 includes for carrying out correct phase-adjusted delay line DL.Also by applying different biased electricals Pressure obtains the phase shift of time delay.
Export the function of the single side-band modulator by SBL_0 ° and SBL_90 ° driving in general form now.Index (index) k refers to the signal of single-side belt.Wherein m- modulation index (for N=10, about < 0.06), ω-base band angular frequency, s- Modulated signal (symbol), the t- time:
The modulated signal obtained in top set BR1 is:
(1)
It is in inferior division BR2:
(2).
The electric field for carrying out the continuous glistening light of waves of self-excitation light source is following (for simplicity by amplitude set to 1):
(3).
Therefore it is obtained in top set BR1:
(4)
And it is obtained in branch 2:
(5)
θ=90 ° are obtained:
(6).
Utilize following addition theorem:
We are accurately obtained in branch 1:
(9)
, and pass through small signal approximation (m < < 1):
(10).
It is accurately obtained in inferior division BR2:
(11)
, and pass through small signal approximation (m < < 1):
(12).
The superposition (small signal approximation) of field causes:
(13)
ByWith, it obtains:
(14).
Therefore we are in upper angular frequencyc+ωkPlace obtains having modulation sk(t) phase-modulated wave.Carrier wave is, and E institute's modulating parts are:
(15).
In the case where θ=270 °, we are in lower corner frequency ωc-ωkPlace obtains having modulation sk(t) phase-modulated wave.
Fig. 6 shows the OLT modem devices MOA_OLT including two single side-band modulators SSM_L and SSM_U.
Electric subcarrier band SBL, SBU are broken down into two signals Jing Guo 90 ° of phase shifts, with modulated signal u1, u2 It is consistent.
Herein, top set includes delay line TD, leads to 180 ° of carrier phase between single sideband singal.
Power control member PC1 and delay control PHC are inserted in top set.Inferior division includes the second power control member Part PC2.Each optical modulator SSM_L and SSM_U includes additional correcting electrode CE1, CE2, each, which is received, carrys out self-regulated The correction signal SC1 and SC2 of system control (not shown).The correction signal can also be added in modulated signal.
According to (9) and (11), the signal generation in the case of no small signal approximation, output signal tool are described accurately There is the distortion of 2 times and more high order.These distortions can be corrected in the first approximation, this is by application from being used for approximate (10) (12) small signal approximation more high order extension (higher order expansion) derived from adequately correction signal and It realizes.
(16).
Fig. 7 shows the frequency diagram by the bi-directionally sent optical signalling of single fiber.For example, for downlink and/or Uplink signal can apply phase or phase difference phase-modulation.The optics downlink signal D1-D10 that downlink sends signal DST is carried The information of subcarrier signal DB1-DB10.In this embodiment, 10 signals are only sent in the downstream direction, and in up direction 10 signal U1-U10 of upper transmission.According to fig. 2, downlink signal D1, D3 of lower subband ... carry odd-numbered 1,3 ..., 9, and Downlink signal D2, D4 of upper side band ... carry even-numbered 2,4 ..., 10.Shown in upper part "UplinkWavelength-division multiplexHair The number of delivering letters" UST associated uplink signal U1-U10.In order to allow to be easily identified and for technical reasons, they It is arranged near associated down channel, will be explained below.The optical carrier frequency of downlink transmission signal DST fCWith the optical carrier frequency f of uplink signalONU1- fONU10Show the frequency relation of the signal.Signal is reflected by horizontal line It indicates.
Special channel separation (frequency distance between adjacent channel) n Δ (n=3,4) is selected for two reasons.First It is in order to avoid due to being damaged caused by reflection.Followed by cause in order to avoid the harmonic wave of the carrier wave due to electronics band signal Damage (Fig. 9, Figure 11).The frequency distance of downlink signal D1 and D2 and uplink signal U1 and U2 are 4 Δs.It is also possible that 6 Δ,8Δ,….The spacing of every other channel channel adjacent thereto (such as CH4 and CH6) is 3 Δs (and 6 Δs, 9 Δs, 12 Δ ...), wherein minimum delta=(1.2-1.5) BW(BW- sends signal DST bandwidth).If channel separation is greater than minimum spacing 3 Δ, 4 Δs, then can be with the higher frequency tolerance of accept channel.
Fig. 8 shows the block diagram of ONU transceiver RX_ONT comprising the balance cross polarization for coherent demodulation (polarisation) diversity receiver CRX, tunable laser TL(continuous wave light source) and ONU transmitter TX_ONU.? Hamacher, M., Heidrich H., Kruger, U., Stenzel, R., Bauer, J.G., Albrecht, H.'s “Coherent receiver front-end module including a polarization diversity waveguide OIC and a high-speed InGaAs twin-dual p-i-n photodiode OEIC both Based on InP ", IEEE Photonics Technology Letters 4 (1992), Nr.11, S.1234-7; The coherent receiver is described in ISSN:1041-1135.
The cross polarization diversity receiver CRX_ONU passes through the reception signal and laser signal ω that will be independent of polarizationONU Superposition sends signal DST to convert downlink.Received transmission signal is converted into downlink electronic band DSB.Laser frequency quilt Be tuned to preset frequency, such as fONU1.Specific downlink signal (such as D1) is then converted into its frequency corresponding to band logical (bandpath) electronic signal of frequency.The downstream electrical signals are selected by filter and judging unit FD, and other signals and Component is then blocked.
The modulation and amplification for optics uplink signal (such as U1) are executed in ONU transmitter TX_ONU.It will be identical Tunable laser signal ωONU1(respectively about all ONU: carrier frequency fONU1- fONU10) be fed to optical modulator MO with As carrier signal, modulated by upstream data signals US1.Pass through separator LSP(Fig. 1) the optics uplink of each ONU is believed It number is combined into uplink and sends signal UST.
Control unit CON_ONU controls tunable laser TL.It therefore, can be by receiving via control bus CB It controls information and ONU is adapted into each down channel.Laser frequency can be higher or lower than signals selected optical carrier frequency Rate.It is likely to use the identical laser signal divided by separator SP for receiver and transmitter in both cases.
Fig. 9 shows four electronic band frequency spectrums of ONU1-ONU4.Spectrum intensity is depicted as frequencies/channels spacing f/ Δ Function.About the first upper left ONU 1(), received downlink sends signal DST and is converted into downlink subband DSS1(telecommunications Number frequency spectrum；Upper left).The label D1-D10 of downlink signal is also used for the electronics band signal in ONU reception.It is being converted into electronics After band signal, the first optics downlink signal D1 corresponds to the first subband down channel CHD1 and is selected by bandpass filter BP It selects；The every other downlink signal of two sidebands and the reflective portion RU1-RU10 of uplink signal U1-U10 are by the band Pass filter blocks.Other of Fig. 9 diagrammatically show the electronic band frequency spectrum of downlink subband DSS2-DSS4.These different frequency spectrums It is by utilizing different frequency fONU2- fONU10(figure is converted obtained from the downlink signal received in ONU2-ONU4 6).Herein, selected signal is always assigned to identical downlink sub-band channel CHD1.In every other ONU, institute The downlink signal received is converted into similar subband signal.For the sake of clarity, before illustrate only in these diagrams 10 channels (number corresponding to f/ Δ).
Figure 10 shows the simplified embodiment of the OLT including receiver RX_OLT and transmitter TX_OLT.Uplink sends letter The received uplink signal U1-U10 of number UST is also converted into uplink electricity by balance cross polarization diversity receiver CRX_ONT Subband signal USS.Optics OLT carrier signal CW is also used for this conversion.Then in processing unit PU (such as with telecommunications Pass through filter after number mixing) separation uplink electronics band signal U1-U10, and it is fed to individual digit receiver RX1-RX10 is to regain upstream data signals US1-US10.
OLT transmitter TX_OLT consists essentially of the modulation unit and amplifier having been noted above.
Figure 11 shows the electric frequency spectrum of the uplink signal received at the OLT being converted into after uplink electronic band USS. The label U1-U10 of uplink signal is also used for the electric signal of OLT subband.All reflective portion RD1-RD10 of downlink signal Falling in each uplink subband signal USS(, it corresponds to U1-U10) between.Such as it is filtered by the different RX-BP of the processing unit The separation of wave device sub-band channel CHU1,3,4,6 ..., the uplink subband signal USS that receives in CHU15.
Figure 12 shows one embodiment of the OLT_A of advanced networks.Since the channel number of every CW is for physical cause And it is restricted, therefore multiple transmitter TX1_OLT-TX32_OLT(are set in the olt and each generate double-side band transmission Signal DST1-DST32).Each output signal DST1-DST32 is combined by wavelength division multiplexer MUX and passes through circulator (circulator) CI is sent.
The uplink wavelength-division multiplex signals UST1-UST32 received from circulator CI output, and demultiplexed by wavelength-division Subcarrier multiplexing, which is de-multiplexed into, with device (wavelength division demultiplexer) DMUX sends signal UST1-UST32.Signals are sent to these in OLT receiver RX_OLT1-RX_OLT32 each of work as and is concerned with Demodulation, and convert thereof into uplink electronic band (such as USS in Figure 11).Each uplink signal is subsequently isolated and respectively by it Export or be sent to another ONU.
The present invention is not limited to the details of principle described above.It is intended that the scope of the present invention be defined by the claims appended hereto, And therefore the present invention should be comprising falling in all changes and modification within the scope of the equivalent expression of claims.Especially in energy In the case where enough acquisition high speed processors with reasonable prices, Digital data processing can be used to substitute analogue data processing.
Appended drawing reference
OLT- center cell (optical line terminals)
ONU- optical line units
MN- Metropolitan Area Network (MAN)
FI- optical fiber
LSP- separator
MOD_OLT- modulation unit
DS1, DS2 ... the-the first, second data-signal
PM1, PM2 ... the-the first, second phase-modulator
DB1, DB2 ... the-the first, second subcarrier signal
ω1, ω2...-subcarrier
The first, second combiner of CO1, CO2-
Subcarrier band under SBL-
The upper subcarrier band of SBU-
LA- continuous wave light source/laser
The continuous glistening light of waves/the carrier signal of CW-
Carrier signal of the CWI- Jing Guo reverse phase (inverted)/phase shift
ωCThe angular frequency of-CW
LSB- lower sideband
USB- upper side band
AD- adder
DL- time delay
DST-(double-side band) downlink transmission signal
The second modulation unit of MOD2_OLT-
H1, H2 ... the-the first, second mixer (Hilbert filter)
COM11, COM12 ...-other combiner
SBL_0 °, SBL_90 °-subcarrier band Jing Guo phase shift
MOD3_OLT- third modulation unit
ωECCommon electrical carrier signal
ωCO1-10Conversion signal
FI1-FI10 --- the first-the ten filter
DB1-DB10 --- subcarrier signal (SBL+SBU)
The first modulated signal of u1-
The second modulated signal of u2-
BR1- top set
BR2- inferior division
The first, second separator of SP1, SP2-
DL- delay line
The-the first electric field of E1 (t)
The-the second electric field of E2 (t)
E- summations of ∑
MD- carrier delay line
MOA_OLT-OLT modulating device
The first mixer of HL- (Hilbert filter)
The second mixer of HU- (Hilbert filter)
The first correcting electrode of CE1-
The second correcting electrode of CE2-
The first, second power control member of PC1, PC2-
PHC- phase controlling
SPC-CW separator
The first, second correction signal of SC1, SC2-
D1, D2 ... the-the first, second downlink signal
U1-U10 --- the first, second uplink signal
D1-D10 --- downlink signal
DST- downlink sends signal
UST- uplink sends signal
RX_ONU-ONU receiver
TX_ONU-ONU transmitter
FD- filter and judging unit
TL- tunable laser
ωONUOptics ONU carrier wave
fONU- ONU optical carrier frequency
SPL- laser signal separator
CON_ONU-ONU control unit
CB- control bus
The first, second uplink of U1, U2- (data) signal
The reflection of the first up channel of RU1-
The reflection of the second up channel of RU2-
DSS1-DSS4 --- downlink sub-channels ONU1-ONU4
RX_OLT-OLT cross polarization diversity receiver
PD- processing and judging unit
TX_OLT-OLT transmitter
PU- receiver processing unit
RX1-RX10- digit receiver
The source LA-CW
USS- uplink subband (signal)
CW1-CW32 --- the source 1-32.CW
TX1-TX32 --- 1-32. transmitter
RX1-RX32 --- 1-32. receiver
MUX- wavelength division multiplexer
DMUX- Wave decomposing multiplexer
CI- circulator
DST1-DST32 --- 1-32 downlink sends signal

Claims (4)

1. a kind of method that multiple optical signallings are bidirectionally sent via single fiber,
Wherein, multiple optics downlink signals are sent in the downstream direction and multiple optics uplink signals are sent out in the upstream direction It send,
Wherein, the frequency spacing between two contiguous downstream signals in the downlink signal is 2 n Δs, wherein n =2,3,4 ..., and Δ corresponds to minimum channel spacing, and
Frequency spacing between every other adjacent downlink signal is 3 k Δs, wherein k=1,2,3 ..., and And wherein, uplink signal is sent using sitgnal distancel identical with associated downlink signal.
2. the method according to claim 1, wherein Δ is equal to 1.2-1.5 times of the bandwidth of downstream transmission signals.
3. according to the method for any one of preceding claims, wherein sending optics downlink signal to multiple from optical line terminals Optical network unit, and wherein from the multiple network unit to be sent to the optowire whole for the optically row signal End.
4. according to the method described in claim 3, wherein each optical network unit uses the same laser separated by separator Signal is to send its corresponding uplink signal and to receive corresponding downlink signal.
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CN1897502A (en) * 2005-07-12 2007-01-17 阿尔卡特公司 Transmission method and processing unit for a modulated optical signal

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