CN101237294A - Full-light controlled optical switch system - Google Patents
Full-light controlled optical switch system Download PDFInfo
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- CN101237294A CN101237294A CNA2008100343010A CN200810034301A CN101237294A CN 101237294 A CN101237294 A CN 101237294A CN A2008100343010 A CNA2008100343010 A CN A2008100343010A CN 200810034301 A CN200810034301 A CN 200810034301A CN 101237294 A CN101237294 A CN 101237294A
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Abstract
The invention relates to an all-optical controlled optical switch system, wherein, a control signal is continuous light with different wavelengths, and can realize the output of input optical signals from one or a plurality of output ports. Input signal light is divided into two parts; when control light exists, the optical information of one part of input signal light is firstly converted onto the control light through a wavelength converter, the control light with different wavelengths passes through a wavelength routing module, then is separated, and is output from corresponding ports of the wavelength routing module; the other part of signal light is changed into the continuous light through a traveling wave semi-conductor optical amplifier, split through a coupler, and then is input into each second-stage wavelength converter; the control light with the information and the continuous light the wavelength of which is the same as that of the input signal light undergo second wavelength transformation in each second-stage wavelength converter, and the output of the second wavelength converters is the output of the all-optical controlled optical switch system. The invention solves the problem of the all-optical controlled optical switch.
Description
Technical field
The present invention relates to a kind of optical switching system of full photocontrol, be specifically related to a kind of based on Mach-Zehnder interfere type semiconductor optical amplifier (MZI-SOA) optical wavelength conversion and the optical switching system of the full photocontrol of travelling-wave semiconductor optical amplifier (SOA) gain saturation, solve problems such as all-optical switch control, optical switch switching, belong to the optical communication technique field.
Background technology
Wavelength division multiplexing (WDM) transmission technology and full light switching technology are the key technologies of all optical network.Optical switch all plays an important role aspect these two.In the WDM transmission technology, the application scenario of optical switch has wavelength to switch, wavelength is adaptive, the conversion of regularly extraction of light, the regeneration of light code stream, light return-to-zero code (RZ sign indicating number) and light NRZ (NRZ sign indicating number) etc.In full light switching technology, necessary wavelength exchange when optical switch is used for optical switching matrix, the cross-coupled all-optical logic of control of optical cross connect in a large number and selects the wavelength route.Therefore, optical switch is one of basic device of all optical network, also is one of key technology of current obstruction all optical network development.
Novel optical switch mainly is divided into electric control optical switch and optically controlled optical switch two classes.Electric control optical switch has the moving fiber formula, various forms of waveguide switches, thermo-optical switch, liquid crystal optical switch, acousto-optic optical switch, microelectromechanical systems (MEMS) optical switch or the like, and all be the electric switch matrix by the switching system that above electric control optical switch constitutes, the control light signal that this means input will be transformed into the corresponding signal of telecommunication earlier, just can split to close and control, be not easy to all optical network and use.The most potential still optically controlled optical switch, using optically controlled optical switch is the developing direction of all optical network.
Main optically controlled optical switch technology has nonlinear waveguide directional coupler and nonlinear optical fiber loop mirror (NOLM) now.Nonlinear waveguide directional couple optical switch is to be formed by a plurality of directed waveguide coupler cascades.The coupler of this cascade can realize comprising and the logical operation function of many complexity such as door or door, not gate, XOR that the power output of nonlinear coupler depends on coupling length, initial phase difference and input power.In fact because the luminous power that the non-linear coupling of generation needs is very big, also can not move towards practical at present.
NOLM makes according to the Sagnac principle of interference of optical fiber, and optical fiber loop is as kerr medium, and nonlinear interaction (cross-phase modulation) is just finished therein.As not adding control light, output is not output just, just as completely reflecting mirror.If introduce the control light pulse in optical fiber loop by the wave division multiplex coupler clockwise direction because the cross-phase modulation, with the control equidirectional transmission of light and on time domain overlapped that part of pulse light will experience bigger nonlinear phase shift.Cause pulse light generation phase difference on the both direction like this, thereby make nonlinear optical fiber loop mirror output that output be arranged, realized switching manipulation.Relation according to control light and signal light wavelength and polarization direction generally is divided into two classes with nonlinear optical fiber loop mirror: the one, and the wavelength difference, the polarization direction is identical; The 2nd, wavelength is identical, the polarization direction quadrature.Former structure is simple, and switching speed is fast, and the switch energy is low, but the cascade inconvenience is unfavorable for integrated.Latter's cascade is relatively convenient, be beneficial to integrated, but Polarization Control complexity, control light is little to the contribution of phase shift.
All-optical switch in the research also has the dual wavelength Mach-Zehnder to interfere (Mach-Zehnder) type optical switch and Kerr-type optical switch, but their technology more complicated all, and from practicability very big distance is arranged.In addition, existing all-optical switch all can only be realized the break-make of single channel light, can not form the optical switch matrix of the light exchange that is used for optical cross connect effectively.
Summary of the invention
The objective of the invention is to needs, propose a kind of optical switching system of full photocontrol, can realize the light switch function of 1 * N, improve switching speed, promote the performance of the optical switching system in the optical cross connect at the deficiencies in the prior art and real system.
Be to realize this purpose, the present invention is with the wavelength conversion of MZI-SOA, and SOA gain saturation characteristic and wavelength routing module be basic, by twice wavelength conversion, to the optical switching system of realizing full photocontrol with the wavelength route of wiping of the light signal of input signal light.The optical switching system control signal of this full photocontrol is the continuous light of different wave length, can realize that input optical signal exports from arbitrary output port.Input signal light is divided into two parts, during the input of control light, the information of part input signal light transforms to earlier on the control light by wavelength conversion, separate behind the control light process wavelength routing module of different wave length, export from wavelength routing module corresponding ports, another part flashlight becomes continuous light by travelling-wave semiconductor optical amplifier, import each second level wavelength shifter in the back along separate routes through coupler, the control light continuous light identical with input signal light with wavelength that carries information carries out the wavelength conversion second time in partial each wavelength shifter, the output of second level wavelength shifter then is the output of the optical switching system of full photocontrol.
The solution of the present invention specifically describes as follows:
The formation of the optical switching system of full photocontrol of the present invention mainly comprises: MZI-SOA wavelength shifter, travelling-wave semiconductor optical amplifier, wavelength routing module.
Divide two-way output behind flashlight input 1 * 2 coupler, one tunnel output links to each other with the input of travelling-wave semiconductor optical amplifier, and another road output links to each other with the flashlight input of first order MZI-SOA wavelength shifter; The continuous light input of control light input first order MZI-SOA wavelength shifter, the output of first order MZI-SOA wavelength shifter links to each other with the input of wavelength routing module, and each output of wavelength routing module links to each other with the signal input part of a corresponding second level MZI-SOA wavelength shifter respectively; The output of travelling-wave semiconductor optical amplifier links to each other with the input of optical isolator; The input of optical isolator links to each other with the input of 1 * N coupler, the N of a 1 * N coupler output links to each other with the continuous light input of a corresponding second level MZI-SOA wavelength shifter respectively, and the output of second level MZI-SOA wavelength shifter is optical switching system output.
Input signal light is earlier through one 1 * 2 coupler, be divided into two-way then, one tunnel input travelling-wave semiconductor optical amplifier, the flashlight input of another road input first order SOA-MZI wavelength shifter, the continuous light input of control light input first order MZI-SOA wavelength shifter.By modulation of the cross-phase in the MZI-SOA wavelength shifter and interference, the information on the flashlight will be copied on the control light, and the output of first order MZI-SOA wavelength shifter is the control light that carries same information with flashlight.Carry the control light input wavelength routing module of information, the light of the different output output different wave length windows of wavelength routing module, the control optical wavelength that each wavelength window is corresponding different, wavelength routing module corresponding port just has output when having only the input of control corresponding light, and each road control light output of wavelength routing module all links to each other with the signal input part of a MZI-SOA wavelength shifter.
Another road light signal that the input coupler is told will be imported a travelling-wave semiconductor optical amplifier, utilize the gain saturation of travelling-wave semiconductor optical amplifier, the information of flashlight will be wiped free of, be that 0 on the flashlight and 1 all will be amplified to same power level, flashlight becomes continuous light but wavelength is constant.This continuous light through an isolator with link to each other with 1 * N coupler, the effect of isolator is to be used for isolating the oppositely residual light signal of input 1 * N coupler of MZI-SOA wavelength shifter, the continuous light input of continuous light input MZI-SOA wavelength shifter after the shunt of 1 * N coupler, in the MZI-SOA wavelength shifter, the cross-phase modulation takes place and interferes in flashlight in continuous light, signal is modulated on the continuous light of input again on the control light, and continuously light wavelength is exactly a switching system input signal light wavelength, and the information on the light controlled thus transforms on the input optical wavelength once more by the MZI-SOA wavelength shifter to be exported.For the overall optical switching system, as long as the control light input of certain wavelength is arranged, corresponding output port just has flashlight output.
Compare with prior art, the present invention has many-sided superiority.The present invention has realized the optical switching system of full photocontrol by utilizing the gain saturation of twice wavelength conversion and SOA, and this optical switching system is to be controlled by light, so switch is extremely short switching time, has promoted the performance of the optical switching system in the optical cross connect greatly.Optical switching system of the present invention has been realized the light switch function of 1 * N, and it forms device technology maturation, benefit integrated, very fast practicability.Employing based on the wavelength Conversion of the cross-phase of SOA modulation (XPM) also have output signal warble little, signal to noise ratio is high, extinction ratio is high, with advantages such as polarization irrelevant and compact conformation.
Description of drawings
Fig. 1 is the structure chart of MZI-SOA wavelength shifter among the present invention.
Fig. 2 is the optical switching system structure chart of the full photocontrol of the present invention.
Embodiment
In order to understand technical scheme of the present invention better, execution mode is further described below in conjunction with accompanying drawing.
Fig. 1 is the structural representation of MZI-SOA wavelength shifter among the present invention.The MZI-SOA wavelength shifter is made up of two SOA that constitute Mach-Zehnder interference structure (MZI), and a continuous light input port is arranged, an output port, and two flashlight input ports, flashlight can be from arbitrary flashlight input port input.
Continuous light λ
cEnter the MZI-SOA wavelength shifter and be divided into two bundles earlier, when two-beam was propagated in SOA, the effective refractive index of SOA was along with injecting the variation of luminous power and change from the flashlight input, thereby caused continuous light λ
cPhase shift in SOA changes, and by the MZI interference structure, the phase shift variations that cross-phase modulation effect produces can be converted to the variable power of output light, thereby reach flashlight λ
0On information conversion to the input continuous light λ
cOn, realized wavelength conversion.
Fig. 2 is the structural representation that the present invention is based on the all-optical switch system of MZI-SOA wavelength conversion, its main functional modules (device) comprising: MZI-SOA wavelength shifter, travelling-wave semiconductor optical amplifier, wavelength routing module, each module (device) all link to each other by optical fiber.
Flashlight input 1 * 2 coupler, 1 * 2 coupler has two-way output, one tunnel output links to each other with the input of travelling-wave semiconductor optical amplifier, another road output links to each other with the flashlight input of first order MZI-SOA wavelength shifter, the continuous light input of control light input first order MZI-SOA wavelength shifter.The output of first order MZI-SOA wavelength shifter links to each other with the input of wavelength routing module, and each road output of wavelength routing module all links to each other with the flashlight input of a second level MZI-SOA wavelength shifter.The output of travelling-wave semiconductor optical amplifier links to each other with the input of optical isolator, the output of optical isolator links to each other with the input of 1 * N coupler, and the N of 1 * N coupler output links to each other with the continuous light input of a corresponding second level MZI-SOA wavelength shifter respectively.The output of second level MZI-SOA wavelength shifter is optical switching system output.
Wavelength is λ
0Flashlight earlier be divided into two-way at input through 1 * 2 coupler, the flashlight of input MZI-SOA wavelength shifter carries out the cross-gain modulation and interferes control light wavelength λ the control light of input MZI-SOA wavelength shifter
1-λ
nCorresponding each wavelength window of wavelength routing module.After the cross-gain modulation and interfering, the information reproduction on the flashlight carries the control light input wavelength routing module of information to control light.The control light of different wave length is from the different port output of wavelength routing module.The flashlight λ of input travelling-wave semiconductor optical amplifier
0Become continuous light, the continuous light λ of output because of the gain saturation of travelling-wave semiconductor optical amplifier
0Through being divided into the N road by 1 * N coupler behind the isolator, isolator is used for isolating the light signal of reverse output travelling-wave semiconductor optical amplifier.The continuous light input of MZI-SOA wavelength shifter is imported in the output of 1 * N coupler respectively, is λ with wavelength once more with the control light that carries information in the MZI-SOA wavelength shifter
0Continuous light light carry out wavelength conversion second time through cross-gain modulation and interference, information reproduction is arrived λ
0Last output.N output correspondence N wavelength X of control light
1-λ
nThe switching system corresponding port just has output when control photophase wavelength has input.
Claims (1)
1, a kind of optical switching system of full photocontrol, it is characterized in that dividing two-way output behind flashlight input 1 * 2 coupler, one tunnel output links to each other with the input of travelling-wave semiconductor optical amplifier, and another road output links to each other with the flashlight input of first order MZI-SOA wavelength shifter; The continuous light input of control light input first order MZI-SOA wavelength shifter, by modulation of the cross-phase in first order MZI-SOA wavelength shifter and interference, information on the flashlight is transformed on the control light, the output of first order MZI-SOA wavelength shifter links to each other with the input of wavelength routing module, the control light that carries with the same information of flashlight is input to the wavelength routing module, the wavelength routing module arrives different output ports with the control optical routing of the different wave length of input, and each output of wavelength routing module links to each other with the signal input part of a corresponding second level MZI-SOA wavelength shifter respectively; Travelling-wave semiconductor optical amplifier becomes continuous light with flashlight, and its output links to each other with the input of optical isolator; The input of optical isolator links to each other with the input of 1 * N coupler, and the N of a 1 * N coupler output links to each other with the continuous light input of a corresponding second level MZI-SOA wavelength shifter respectively; In the MZI-SOA wavelength shifter of the second level, the information on the control light through cross-phase modulation and interference, transforms on the signal light wavelength and exports once more, and the output of second level MZI-SOA wavelength shifter is optical switching system output.
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| CN2008100343010A CN101237294B (en) | 2008-03-06 | 2008-03-06 | Full-light controlled optical switch system |
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| CN2008100343010A CN101237294B (en) | 2008-03-06 | 2008-03-06 | Full-light controlled optical switch system |
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| CN101237294B CN101237294B (en) | 2012-04-25 |
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Cited By (7)
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| CN103226278A (en) * | 2013-05-21 | 2013-07-31 | 北京交通大学 | Eight-bit full-light comparator based on quantum dot semiconductor optical amplifier |
| CN103297146A (en) * | 2012-03-02 | 2013-09-11 | 北京邮电大学 | Multilevel optical signal generating device and method |
| CN104993870A (en) * | 2015-07-22 | 2015-10-21 | 北京邮电大学 | Radio frequency exchanging device |
| CN105319739A (en) * | 2015-11-26 | 2016-02-10 | 西南交通大学 | Optical switch based on stimulated Brillouin scattering |
| CN106886119A (en) * | 2017-04-19 | 2017-06-23 | 南京恒高光电研究院有限公司 | A kind of optical wavelength converter towards QPSK signals |
| CN106961069A (en) * | 2017-04-25 | 2017-07-18 | 电子科技大学 | High Extinction Ratio periodic pulse signal generation system and method based on feedback arrangement |
| CN110221502A (en) * | 2019-07-04 | 2019-09-10 | 杭州电子科技大学 | A kind of precipitous photoswitch of full light with second order coupled dispersion and active nonlinear birefringence fiber coupler |
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| CN2434686Y (en) * | 2000-07-27 | 2001-06-13 | 浙江大学半导体光电子技术与系统研究所 | Light injection whole internally reflecting 1XN all light switch array |
| CN1175597C (en) * | 2002-11-07 | 2004-11-10 | 上海交通大学 | Buffer-storage-free photo-exchanging matrix based on sharing wavelength convertor |
| CN1549607A (en) * | 2003-05-22 | 2004-11-24 | 上海市激光技术研究所 | MXN light matrix multi-channel exchanging method |
| CN2653792Y (en) * | 2003-07-24 | 2004-11-03 | 华中科技大学 | Full light wave long route cross module |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103297146A (en) * | 2012-03-02 | 2013-09-11 | 北京邮电大学 | Multilevel optical signal generating device and method |
| CN103226278A (en) * | 2013-05-21 | 2013-07-31 | 北京交通大学 | Eight-bit full-light comparator based on quantum dot semiconductor optical amplifier |
| CN103226278B (en) * | 2013-05-21 | 2016-02-03 | 北京交通大学 | Based on 8 full optical comparators of quantum spot semiconductor image intensifer |
| CN104993870A (en) * | 2015-07-22 | 2015-10-21 | 北京邮电大学 | Radio frequency exchanging device |
| CN104993870B (en) * | 2015-07-22 | 2018-10-26 | 北京邮电大学 | A kind of radio frequency exchange device |
| CN105319739A (en) * | 2015-11-26 | 2016-02-10 | 西南交通大学 | Optical switch based on stimulated Brillouin scattering |
| CN105319739B (en) * | 2015-11-26 | 2018-03-27 | 西南交通大学 | Photoswitch based on stimulated Brillouin scattering |
| CN106886119A (en) * | 2017-04-19 | 2017-06-23 | 南京恒高光电研究院有限公司 | A kind of optical wavelength converter towards QPSK signals |
| CN106886119B (en) * | 2017-04-19 | 2019-08-23 | 南京恒高光电研究院有限公司 | A kind of optical wavelength converter towards QPSK signal |
| CN106961069A (en) * | 2017-04-25 | 2017-07-18 | 电子科技大学 | High Extinction Ratio periodic pulse signal generation system and method based on feedback arrangement |
| CN110221502A (en) * | 2019-07-04 | 2019-09-10 | 杭州电子科技大学 | A kind of precipitous photoswitch of full light with second order coupled dispersion and active nonlinear birefringence fiber coupler |
| CN110221502B (en) * | 2019-07-04 | 2022-06-14 | 杭州电子科技大学 | All-optical steep optical switch with second-order coupling dispersion and active nonlinear birefringent optical fiber coupler |
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