CN101237295B - Full-light multicast optical switch system - Google Patents
Full-light multicast optical switch system Download PDFInfo
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- CN101237295B CN101237295B CN2008100343025A CN200810034302A CN101237295B CN 101237295 B CN101237295 B CN 101237295B CN 2008100343025 A CN2008100343025 A CN 2008100343025A CN 200810034302 A CN200810034302 A CN 200810034302A CN 101237295 B CN101237295 B CN 101237295B
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Abstract
The invention relates to an all-optical multicast optical switch system. A control signal is continuous light with different wavelengths and is reversely input into an SOA-XGM wavelength converter; one part of input signal light enters the wavelength converter, is reversely converted onto control light through cross-gain modulation, and is output in a corresponding second-stage SOA-XGM wavelength converter through a wavelength routing module; the other part of the input signal light is changed into the continuous light through a traveling wave semi-conductor optical amplifier and input into a 1 multiplied by N coupler through an optical isolator, each output end of the 1 multiplied by N coupler is respectively connected with a corresponding second-stage SOA-XGM wavelength converter; in the second-stage wavelength converter, the information on the control light is reversely converted onto the wavelength of the signal light again through the cross-gain modulation, the output of the second-stage wavelength converter is the output of the all-optical multicast optical switch system. The all-optical multicast optical switch system solves the problem of optical signal multicast in the optical switch system by taking advantage of two times of wavelength transformations and the gain saturation of the SOA.
Description
Technical field
The present invention relates to a kind of full-light multicast optical switch system, relate in particular to the full-light multicast optical switch system of a kind of based semiconductor image intensifer cross-gain modulation (SOA-XGM) optical wavelength changer and semiconductor optical amplifier (SOA) gain saturation, solve problems such as all-optical switch control, optical switch switching and light signal multicast, belonged 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 dual wavelength Mach-Zehnder (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 at the deficiencies in the prior art and real system, a kind of full-light multicast optical switch system is proposed, not only can realize the light switch function of 1 * N, also the may command light signal is exported from one or more ports, improve switching speed and be exceedingly fast, promote the performance of the optical switching system in the optical cross connect, very ripe and benefit integrated because of forming device again simultaneously, comparatively fast practicability can further promote performance along with development of technologies again.
For realizing this purpose, the present invention is with the wavelength conversion of based semiconductor image intensifer (SOA) cross-gain modulation (XGM), SOA gain saturation characteristic and wavelength routing module are the basis, by twice wavelength conversion, the wiping with the wavelength route of light signal of input signal light realized full-light multicast optical switch system.In this full-light multicast optical switch system, control signal is the continuous light of different wave length, can import the control light of 1 or several different wave lengths simultaneously.Control light oppositely injects the SOA-XGM wavelength shifter, modulates the information reciprocal transformation to control light through cross-gain.Carry the control light input wavelength routing module of reverse information, and export from corresponding port, each output of wavelength routing module all is reversely connected to the reverse input end of each second level SOA-XGM wavelength shifter, carries out the also output of the wavelength conversion second time in the SOA-XGM wavelength shifter of each second level.
The solution of the present invention specifically describes as follows:
The main formation of full-light multicast optical switch system of based semiconductor image intensifer cross-gain modulation (SOA-XGM) wavelength conversion comprises: SOA-XGM wavelength shifter, travelling-wave semiconductor optical amplifier, wavelength routing module; Flashlight is divided into two-way by the input coupler, wherein the input of one road flashlight and travelling-wave semiconductor optical amplifier links to each other, another road flashlight is connected to the reverse input end of first order SOA-XGM wavelength shifter, control light is from the positive input input of first order SOA-XGM wavelength shifter, and the output of the long converter of first order SOA-XGM is connected to the input of wavelength routing module.Each output of wavelength routing module is connected respectively to the reverse input end of a corresponding second level SOA-XGM 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, the positive input of the second level SOA-XGM wavelength shifter that each output of 1 * N coupler is corresponding with respectively links to each other, and the output of each second level SOA-XGM wavelength shifter is exactly the output of full-light multicast optical switch system.
In full-light multicast optical switch system based on SOA-XGM wavelength conversion scheme, the flashlight of input is divided into two-way through the input coupler earlier, one road flashlight is under the control of the control light (continuous light) of different wave length, carry out the wavelength conversion first time at first order SOA-XGM wavelength shifter place through cross-gain modulation (XGM), signals reverse is transformed on the control light, control light is selected output port through a wavelength routing module, have only the port of corresponding control optical wavelength that output is arranged, the reverse input end that second level SOA-XGM wavelength shifter is all imported in each port output carries out the wavelength conversion second time; Another road flashlight is through a travelling-wave semiconductor optical amplifier, utilize the gain saturation characteristic of travelling-wave semiconductor optical amplifier that flashlight is become continuous light, the effect of optical isolator is to isolate the oppositely residual light of input travelling-wave semiconductor optical amplifier, the continuous light of travelling-wave semiconductor optical amplifier output and import each second level SOA-XGM wavelength shifter in the back along separate routes through 1 * N coupler, in the SOA-XGM wavelength shifter of each second level, the information on the control light is also exported to signal light wavelength through the cross-gain modulating transformation once more.Because the wavelength conversion of the SOA-XGM of the first order can be simultaneously with the signal transformation of flashlight to the control light of a plurality of wavelength, promptly can control the output of a plurality of second level SOA-XGM wavelength shifter, thereby realize multicast functionality.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.
The SOA-XGM wavelength shifter is to utilize the characteristic of semiconductor optical amplifier gain saturation to realize, i.e. consumption owing to charge carrier in the semiconductor optical amplifier occurs gaining with injecting the phenomenon that the luminous power increase reduces.When the flashlight of intensity modulated is imported, consumed carrier concentration, gain is reached capacity.When flashlight was high level, the charge carrier of consumption was many, and the gain of then surveying light is little, otherwise when flashlight was low level, the charge carrier of consumption was few, then surveyed light and obtained big gain.Modulate so output light is transfused to signal, and by behind the semiconductor optical amplifier (SOA), it will carry the information reverse with input signal.Advantages such as the SOA-XGM wavelength shifter has simple in structure, easy realization, conversion efficiency height, and conversion range is wide.By adopting the SOA that is not subjected to the polarization restriction, can also realize the polarization irrelevantization of wavelength Conversion.
Compare with prior art, the present invention has many-sided superiority.The present invention is by utilizing the gain saturation of twice wavelength conversion and SOA, realized the multicast optical switch system of full photocontrol, because this full-light multicast optical switch system is to be controlled by light, so switch is extremely short switching time, different with other all-optical switch scheme, this system has realized the light switch function of 1 * N, also can control light signal simultaneously and export from one or more ports, and it forms device technology maturation, comparatively fast practicability.
Description of drawings
Fig. 1 is the structural representation of SOA-XGM wavelength shifter among the present invention.
Fig. 2 is a full-light multicast optical switch system structure chart 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 the SOA-XGM wavelength shifter that adopts of the present invention.The SOA-XGM wavelength shifter is in series by a SOA amplifier and a reverse input coupler, has a positive input, a reverse input end and an output.Flashlight λ
0From the input of SOA-XGM wavelength shifter reverse input end, continuous light λ
cFrom the positive input input of SOA-XGM wavelength shifter, the signal after the output output wavelength conversion of SOA-XGM wavelength shifter, signal wavelength is λ
c
The SOA-XGM wavelength shifter is the wavelength shifter of structure a kind of cross-gain modulation the simplest, the easiest realization, has the flashlight λ of modulation intelligence
0Enter the wavelength shifter from positive and negative different directions respectively with continuous detection light λ c, the information reciprocal transformation on the cross-gain modulation back flashlight λ 0 is to surveying on the light λ c.
Fig. 2 has provided the structural representation of the full-light multicast optical switch system that the present invention is based on the SOA-XGM wavelength conversion, its main functional modules (device) comprising: SOA-XGM wavelength shifter, travelling-wave semiconductor optical amplifier, wavelength routing module, coupler, each module (device) all link to each other by optical fiber.
As shown in Figure 2, flashlight is divided into two-way output behind the input coupler, wherein the output of one road flashlight links to each other with the input of travelling-wave semiconductor optical amplifier, another road flashlight output is connected to the reverse input end of first order SOA-XGM wavelength shifter, control light is from the positive input input of first order SOA-XGM wavelength shifter, and the output of first order SOA-XGM wavelength shifter is connected to the input of wavelength routing module.Each output of wavelength routing module is connected respectively to the reverse input end of a corresponding second level SOA-XGM 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, the positive input of the second level SOA-XGM wavelength shifter that each output of 1 * N coupler is corresponding with respectively links to each other, and the output of second level SOA-XGM wavelength shifter is exactly the output of full-light multicast optical switch system.
The flashlight λ of input
0Be divided into two-way at the first input coupler of input, the flashlight λ of input SOA-XGM wavelength shifter through 1 * 2
0Carry out the cross-gain modulation with the control light of reverse input SOA-XGM wavelength shifter, the information reciprocal transformation on the flashlight is controlled light wavelength λ to control light
1-λ
nCorresponding each wavelength window of wavelength routing module, control light has only a wavelength in the time of clean culture, the only combination of several different wavelengths of light of control in the time of multicast.Carry the control light input wavelength routing module of reverse information, the control light of different wave length is from the different port output of wavelength routing module, and the reverse input end of the second level SOA-XGM wavelength shifter of input correspondence.The flashlight of input travelling-wave semiconductor optical amplifier is because the gain saturation of travelling-wave semiconductor optical amplifier is become continuous light, this continuous light is divided into the N road by 1 * N coupler after through an optical isolator, and optical isolator is used for isolating the light signal of reverse input travelling-wave semiconductor optical amplifier.The positive input of corresponding second level SOA-XGM wavelength shifter is imported in the output of 1 * N coupler respectively, carries out the also output of the wavelength conversion second time with the control light that carries information in the SOA-XGM wavelength shifter of the second level.The combination of control light wavelength has determined the output of signal in the corresponding port.
Claims (1)
1. full-light multicast optical switch system, it is characterized in that: flashlight is divided into two-way output behind the input coupler, wherein one tunnel output links to each other with the input of travelling-wave semiconductor optical amplifier, and another road output is connected to the reverse input end of first order semiconductor optical amplifier cross-gain modulation SOA-XGM wavelength shifter; Described SOA-XGM wavelength shifter is in series by SOA semiconductor optical amplifier and reverse input coupler, has a positive input, a reverse input end and an output; Control light is from the positive input input of first order SOA-XGM wavelength shifter, signal on the flashlight is modulated reciprocal transformation to control light through cross-gain in first order SOA-XGM wavelength shifter, the output of first order SOA-XGM wavelength shifter connects the input of wavelength routing module, and each output of wavelength routing module is connected respectively to the reverse input end of a corresponding second level SOA-XGM wavelength shifter; Travelling-wave semiconductor optical amplifier utilizes the gain saturation characteristic that flashlight is become continuous light, and its output 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, the positive input of the second level SOA-XGM wavelength shifter that each output of 1 * N coupler is corresponding with respectively links to each other, in the SOA-XGM wavelength shifter of the second level, the information of control on the light once more through the cross-gain modulating transformation to signal light wavelength, the output of second level SOA-XGM wavelength shifter is exactly the output of full-light multicast optical switch system.
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| CN2008100343025A CN101237295B (en) | 2008-03-06 | 2008-03-06 | Full-light multicast optical switch system |
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| CN2008100343025A CN101237295B (en) | 2008-03-06 | 2008-03-06 | Full-light multicast optical switch system |
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| CN101237295B true CN101237295B (en) | 2011-05-11 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1373380A (en) * | 2002-04-12 | 2002-10-09 | 上海交通大学 | Switch array based on arc waveguide all-optical switch |
| CN1392696A (en) * | 2002-07-09 | 2003-01-22 | 华中科技大学 | NXN light exchanging structure in full photo exchanging nodal point |
| CN1410789A (en) * | 2001-09-21 | 2003-04-16 | 迪森科技有限公司 | All optical switch system and its method |
| US6711316B2 (en) * | 2001-07-25 | 2004-03-23 | Jds Uniphase Inc. | Wavelength cross-connect |
| CN1737627A (en) * | 2004-08-19 | 2006-02-22 | 冲电气工业株式会社 | Optical switch |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6711316B2 (en) * | 2001-07-25 | 2004-03-23 | Jds Uniphase Inc. | Wavelength cross-connect |
| CN1410789A (en) * | 2001-09-21 | 2003-04-16 | 迪森科技有限公司 | All optical switch system and its method |
| CN1373380A (en) * | 2002-04-12 | 2002-10-09 | 上海交通大学 | Switch array based on arc waveguide all-optical switch |
| CN1392696A (en) * | 2002-07-09 | 2003-01-22 | 华中科技大学 | NXN light exchanging structure in full photo exchanging nodal point |
| CN1737627A (en) * | 2004-08-19 | 2006-02-22 | 冲电气工业株式会社 | Optical switch |
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