CN103117812B - A kind of regenerator being applicable to WDM-DPSK light signal - Google Patents
A kind of regenerator being applicable to WDM-DPSK light signal Download PDFInfo
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- CN103117812B CN103117812B CN201310025482.1A CN201310025482A CN103117812B CN 103117812 B CN103117812 B CN 103117812B CN 201310025482 A CN201310025482 A CN 201310025482A CN 103117812 B CN103117812 B CN 103117812B
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Abstract
The present invention relates to optical regeneration technical field, disclose a kind of regenerator being applicable to WDM-DPSK light signal, comprise the first pump laser, the second pump laser, the first Polarization Controller, the second Polarization Controller, the first coupler, the second coupler, first medium, second medium and phase adjustment block; Second pump laser is connected with the input of the first Polarization Controller, and the output of the first Polarization Controller is connected with the first coupler; The output of the first pump laser is connected with the input of the first coupler; The output of the first coupler is connected with the input of the second coupler; Light signal is incident from the input of the second Polarization Controller, and the output of the second Polarization Controller is connected with the input of the second coupler, and the output of the second coupler is connected with second medium by first medium; Phase adjustment block connects the two ends of second medium.Present invention achieves the regeneration to WDM-DPSK light signal.
Description
Technical field
The present invention relates to optical regeneration technical field, particularly a kind of regenerator being applicable to WDM-DPSK light signal.
Background technology
After Fibre Optical Communication Technology occurs, optical fiber telecommunications system remains always and develops fast.In the last few years, along with using, the number of user in broadband constantly increased, the business of fiber to the home (FTTH) extensively advances, people to the flow of backbone network and bandwidth requirement also more and more higher.At present, actual transmission system uses the light signal of intensity modulated coding (OOK), the transmission capacity of individual channel has achieved the upgrading from 2.5Gb/s to 40Gb/s, the commercialization application of the light signal transmission system of 100Gb/s is also in iterative method, and the optical signal transmission of 400Gb/s also receives increasing concern simultaneously.But, along with the significantly lifting of transmission rate and the continuous increase of wavelength division multiplexing (WDM) channel number, inevitably bring the problem such as dispersion, nonlinear effect to transmission system, the shape of light signal and frequency spectrum is caused all to there occurs distortion, reduce the quality of signal transmission, cause the raising of the receiving terminal error rate, thus be degrading the transmission performance of system.
For this reason, the light signal of differential phase-shift keying (DPSK) (DPSK) phase-modulation obtains more concern.This is because relative to OOK light signal, DPSK light signal not only has the improvement of 3dB in receiving sensitivity, has higher tolerance for optical fiber dispersion and nonlinear effect etc. simultaneously.But due to the employing of DPSK light signal is phase encoded format, is easy to be subject to impact that is linear and nonlinear phase noise, thus worsens the transmission performance of DPSK light signal.Linear phase noise comes from spontaneous radiation (ASE) noise etc. in phase-modulator and erbium-doped fiber amplifier, nonlinear phase noise be then originate from optical fiber based on Gordon-Mollenauer effect cause by the conversion of amplitude noise to phase noise.In order to suppress phase noise, the phase place regenerator amplified based on fiber phase sensitive parameter can be used to realize the phase place regeneration of DPSK light signal.In addition, optical fiber can transmission bandwidth probably have 300nm, in order to utilize transmission bandwidth large in monomode fiber to meet the demand of information capacity, the light carrier of the multiple different wave lengths with signal must be transmitted, the wavelength-division multiplex technique that Here it is has extensively adopted at present in same monomode fiber simultaneously.Therefore, while dpsk signal obtains more and more concern, WDM-DPSK signal greatly can improve the performance of optical fiber telecommunications system in future in application.
In addition, in the optical-fiber network in future, wavelength shifter increases optical switching network flexibility, reduces the necessary device blocked.The wavelength shifter of current comparative maturity is the transducer of light-electrical-optical type, namely first the light signal of transmission is converted into the signal of telecommunication, after timing regeneration, produce the signal of telecommunication and the clock signal of regeneration, recycling the laser modulation of this signal of telecommunication to standard, is that light signal is to realize wavelength convert function by transform electrical signals.But the wavelength shifter of this light-electrical-optical type must through the conversion of the signal of telecommunication, and cost is relatively high, complicated structure.In addition, the response wave length bandwidth due to the photo-detector in wavelength shifter is relatively narrow and response speed is slow, and therefore this wavelength shifter is difficult to the wavelength convert of the wdm optical signal realizing broadband high-speed rate.
At present, the DPSK optical signal regenerator of researcher's design is all generally the four-wave mixing effect of the degeneracy based on interference ring structure.But this optical signal regenerator generally can only realize single-channel signal regeneration, is not suitable for wdm system, but also the impact of phase noise that the sound wave Brillouin scattering (GAWBS) of easily being guided causes, worsen the transmission performance of light signal.And the basic structure of general wdm optical signal phase place regenerator, as shown in Figure 1, comprise a WDM demodulation multiplexer and a WDM multiplexer, each channel branch road comprises a pump laser, image intensifer, phase-locked loop and two sections of high nonlinear dispersion shifted fibers, realizes phase place regeneration respectively to the light signal of each channel.This system configuration is complicated, and cost is high, is not suitable for practical application.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of regenerator being applicable to WDM-DPSK light signal, it achieves the regeneration to WDM-DPSK light signal.
For solving the problems of the technologies described above, the regenerator that the invention provides a kind of WDM-DPSK of being applicable to light signal comprises: the first pump laser, the second pump laser, the first Polarization Controller, the second Polarization Controller, the first coupler, the second coupler, the first Kerr nonlinearity medium, the second Kerr nonlinearity medium and phase adjustment block; The output of described second pump laser is connected with the input of described first Polarization Controller, and the output of described first Polarization Controller is connected with described first coupler; The output of described first pump laser is connected with the input of described first coupler; The output of described first coupler is connected with the input of described second coupler; WDM-DPSK light signal is incident from the input of described second Polarization Controller, the output of described second Polarization Controller is connected with the input of the second coupler, and the output of described second coupler is connected with described second Kerr nonlinearity medium by described first Kerr nonlinearity medium; Described phase adjustment block connects the two ends of the second Kerr nonlinearity medium.
Further, also comprise: first phase modulator and second phase modulator; Described first pump laser is connected with described first coupler by described first phase modulator, and described second pump laser is connected with described first Polarization Controller by described second phase modulator.
Further, also comprise: the first image intensifer and the second image intensifer; Described first pump laser is connected with described first coupler by described first image intensifer, and described second pump laser is connected with described first Polarization Controller by described second image intensifer.
Further, also comprise: the first image intensifer and the second image intensifer; Described first phase modulator is connected with described first coupler by described first image intensifer, and described second phase modulator is connected with described first Polarization Controller by described second image intensifer.
Further, also comprise: the first band pass filter and the second band pass filter; Described first image intensifer is connected with described first coupler by described first band pass filter, and described second image intensifer is connected with described first Polarization Controller by described second band pass filter.
Further, also comprise: the 3rd image intensifer; Described 3rd image intensifer is arranged between the input of described phase adjustment block and described second Kerr nonlinearity medium.
Further, described phase adjustment block comprises: polarization beam apparatus, polarization beam combiner, piezoelectric ceramic, optical phase-locked loop, the 3rd coupler and the 3rd Polarization Controller; Described polarization beam apparatus and described polarization beam combiner are arranged between described first Kerr nonlinearity medium and described second Kerr nonlinearity medium; One end of described piezoelectric ceramic is connected with polarization beam apparatus, and the other end of piezoelectric ceramic is connected with polarization beam combiner by described 3rd Polarization Controller; Described 3rd coupler is arranged on the output of the second Kerr nonlinearity medium, and described optical phase-locked loop connects piezoelectric ceramic and the 3rd coupler.
Further, described phase adjustment block comprises: polarization beam apparatus, polarization beam combiner, piezoelectric ceramic, optical phase-locked loop, the 3rd coupler and the 3rd Polarization Controller; Described polarization beam apparatus and described polarization beam combiner are arranged between described first Kerr nonlinearity medium and described 3rd image intensifer; One end of described piezoelectric ceramic is connected with polarization beam apparatus, and the other end of piezoelectric ceramic is connected with polarization beam combiner by described 3rd Polarization Controller; Described 3rd coupler is arranged on the output of described second Kerr nonlinearity medium, and described optical phase-locked loop connects piezoelectric ceramic and the 3rd coupler.
Further, also comprise: analyzer; Described analyzer is arranged between described second Kerr nonlinearity medium and described 3rd coupler.
Further, also comprise: the 3rd band pass filter; Described 3rd band pass filter is arranged between described analyzer and described 3rd coupler.
Beneficial effect of the present invention is:
The regenerator being applicable to WDM-DPSK light signal provided by the invention, first produce the ideler frequency light corresponding with WDM-DPSK light by the first Kerr nonlinearity medium, regulated by phase adjustment block again and lock pump light, phase relation between flashlight and ideler frequency light, making the Phase sensitive amplification process of the second Kerr nonlinearity medium have maximum phase sensitive gain; Then utilize the power of the 3rd image intensifer conditioning signal light to make the second Kerr nonlinearity media operation under gain saturation state, so just achieve the phase place regeneration to WDM-DPSK light signal and amplitude regeneration simultaneously.In addition, the present invention can also select to leach ideler frequency light by regulating analyzer, thus achieves the function of wavelength convert, and operation and structure are simply, and cost is lower.The present invention is compared to the phase sensitive parameter amplifying signal regenerator of the four-wave mixing effect of the degeneracy based on interference ring structure, wdm system can be applicable to very easily, avoid the phase noise caused by the sound wave Brillouin scattering (GAWBS) of guided simultaneously, there is better signal regeneration performance; The present invention is compared to general wdm optical signal phase place regenerator, and its structure is simple, and cost is lower, is very suitable for practical application.In addition, the present invention also has good function expansibility, can by multiple regenerator cascade, to realize better signal regeneration performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing wdm optical signal phase place regenerator;
The structural representation being applicable to the regenerator of WDM-DPSK light signal that Fig. 2 provides for the embodiment of the present invention one;
The phase transmission function of the flashlight in the second highly nonlinear optical fiber Phase sensitive amplification process being applicable in the regenerator of WDM-DPSK light signal that Fig. 3 provides for the embodiment of the present invention;
The gain transfer function of the flashlight in the second highly nonlinear optical fiber Phase sensitive amplification process being applicable in the regenerator of WDM-DPSK light signal that Fig. 4 provides for the embodiment of the present invention;
The PHASE DISTRIBUTION figure be applicable to before the regenerator of WDM-DPSK light signal that the WDM-DPSK light signal that Fig. 5 is the first channel is being provided by the embodiment of the present invention;
The PHASE DISTRIBUTION figure be applicable to after the regenerator of WDM-DPSK light signal that the WDM-DPSK light signal that Fig. 6 is the first channel is being provided by the embodiment of the present invention;
The PHASE DISTRIBUTION figure be applicable to before the regenerator of WDM-DPSK light signal that the WDM-DPSK light signal that Fig. 7 is second channel is being provided by the embodiment of the present invention;
The PHASE DISTRIBUTION figure be applicable to after the regenerator of WDM-DPSK light signal that the WDM-DPSK light signal that Fig. 8 is second channel is being provided by the embodiment of the present invention.
Wherein, 1-first pump laser, 2-first phase modulator, 3-first erbium-doped fiber amplifier, 4-first band pass filter, 5-first fiber coupler, 6-second fiber coupler, 7-piezoelectric ceramic, 8-optical phase-locked loop, 9-the 3rd fiber coupler, 10-the 3rd band pass filter, 11-analyzer, 12-second highly nonlinear optical fiber, 13-the 3rd Polarization Controller, 14-polarization beam combiner, 15-polarization beam apparatus, 16-first highly nonlinear optical fiber, 17-first Polarization Controller, 18-second band pass filter, 19-second erbium-doped fiber amplifier, 20-second Polarization Controller, 21-the 3rd erbium-doped fiber amplifier, 22-second phase modulator, 23-second pump laser.
Embodiment
For setting forth the present invention further for the technological means reaching predetermined goal of the invention and take and effect, below in conjunction with accompanying drawing and preferred embodiment, the embodiment being applicable to the regenerator of WDM-DPSK light signal proposed according to the present invention and operation principle are described in detail.
Embodiment one:
See Fig. 2, the regenerator of what the embodiment of the present invention provided be applicable to WDM-DPSK light signal comprises: the first pump laser 1, second pump laser 23, first Polarization Controller 17, second Polarization Controller 20, first coupler, the second coupler, the first Kerr nonlinearity medium, the second Kerr nonlinearity medium, phase adjustment block, the first image intensifer, the second image intensifer, the 3rd image intensifer, the 3rd band pass filter 10 and analyzer 11; The output of the second pump laser 23 is connected with the input of the first Polarization Controller 17 by the second image intensifer, and the output of the first Polarization Controller 17 is connected with the first coupler; The output of the first pump laser 1 is connected with the input of the first coupler by the first image intensifer; The output of the first coupler is connected with the input of the second coupler; WDM-DPSK light signal is incident from the input of the second Polarization Controller 20, the output of the second Polarization Controller 20 is connected with the input of the second coupler, and the output of the second coupler is connected with the second Kerr nonlinearity medium by the first Kerr nonlinearity medium.Phase adjustment block connects the two ends of the second Kerr nonlinearity medium.3rd image intensifer is arranged between the input of phase adjustment block and the second Kerr nonlinearity medium.Preferably, phase adjustment block comprises: polarization beam apparatus 15, polarization beam combiner 14, piezoelectric ceramic 7, optical phase-locked loop 8, the 3rd coupler and the 3rd Polarization Controller 13; Polarization beam combiner 14 and polarization beam apparatus 15 are arranged between the first Kerr nonlinearity medium and the 3rd image intensifer, and the first Kerr nonlinearity medium, polarization beam apparatus 15, polarization beam combiner 14 and the 3rd image intensifer are linked in sequence.One end of piezoelectric ceramic 7 is connected with polarization beam apparatus 15, and the other end of piezoelectric ceramic 7 is connected with polarization beam combiner 14 by the 3rd Polarization Controller 13.3rd coupler is arranged on the output of the second Kerr nonlinearity medium, and optical phase-locked loop 8 connects piezoelectric ceramic 7 and the 3rd coupler.Analyzer 11 is arranged between the second Kerr nonlinearity medium and the 3rd coupler.3rd band pass filter 10 is arranged between analyzer 11 and the 3rd coupler.
In order to spontaneous radiation (ASE) noise that filtering is brought by image intensifer, first band pass filter 4 is arranged between the first image intensifer and the first coupler, the second band pass filter 18 is arranged between the second image intensifer and the first Polarization Controller 17 simultaneously.
The noise that the stimulated Brillouin scattering (SBS) caused in transmission medium to suppress pump light produces, first phase modulator 2 is arranged between the first pump laser 1 and the first image intensifer, second phase modulator 22 is arranged between the second pump laser 23 and the second image intensifer simultaneously.
Preferably, image intensifer is erbium-doped fiber amplifier, and namely the first image intensifer is the first erbium-doped fiber amplifier 3, second image intensifer be the second erbium-doped fiber amplifier the 19, three image intensifer is the 3rd erbium-doped fiber amplifier 21; Coupler is fiber coupler, and namely the first coupler is the first fiber coupler 5, second coupler be the second fiber coupler the 6, three coupler is the 3rd fiber coupler 9.Kerr nonlinearity medium comprises: highly nonlinear optical fiber and silica-based waveguides etc.In the present embodiment, Kerr nonlinearity medium is highly nonlinear optical fiber, and namely the first Kerr nonlinearity medium is the first highly nonlinear optical fiber 16, second Kerr nonlinearity medium is the second highly nonlinear optical fiber 12.
The regenerator of what the embodiment of the present invention provided be applicable to WDM-DPSK light signal, first produce the ideler frequency light corresponding with WDM-DPSK light by the first Kerr nonlinearity medium, regulated by phase adjustment block again and lock pump light, phase relation between flashlight and ideler frequency light, making the Phase sensitive amplification process of the second Kerr nonlinearity medium have maximum phase sensitive gain; Then utilize the power of the 3rd erbium-doped fiber amplifier conditioning signal light to make the second Kerr nonlinearity media operation under gain saturation state, so just achieve the phase place regeneration to WDM-DPSK light signal and amplitude regeneration simultaneously.
What the embodiment of the present invention provided is applicable to the regenerator of WDM-DPSK light signal in use, first sends out continuous print pump light Px by the first pump laser 1, sends out continuous print pump light Py by the second pump laser 23; Pump light Px through first phase modulator 2, and is carried out power amplification by the first erbium-doped fiber amplifier 3.Pump light Py through second phase modulator 22, and is carried out power amplification by the second erbium-doped fiber amplifier 19; The pump light Py that first Polarization Controller 17 pairs power is exaggerated carries out polarization adjustment, orthogonal with the polarization direction of pump light Px to guarantee the polarization direction of the pump light Py exported from the first Polarization Controller 17.Pump light Px and pump light Py is coupled by the first fiber coupler 5 again.Meanwhile, the WDM-DPSK light signal incided in the second Polarization Controller 20 carries out Polarization Modulation through the second Polarization Controller 20, consistent with the polarization direction of pump light Px to guarantee the polarization direction of the WDM-DPSK flashlight exported from the second Polarization Controller 20.From first fiber coupler 5 export pump light Px, pump light Py and from second Polarization Controller 20 export WDM-DPSK light be coupled by the second fiber coupler 6.The first highly nonlinear optical fiber 16 is admitted to by pump light Px, pump light Py and WDM-DPSK light that the second fiber coupler 6 is coupled, and utilize the four-wave mixing effect in the first highly nonlinear optical fiber 16 to generate one group of polarization direction ideler frequency light identical with the polarization direction of pump light Py, and ensure the WDM-DPSK flashlight that exports and ideler frequency light has higher yield value and power is substantially identical.Here it should be noted that, in the present embodiment, for the WDM-DPSK light with different capacity and wavelength, can by regulating the power adjustments of drive current realization to pump light of pump laser, by the adjustment regulating the knob of the output wavelength on pump laser can realize the output wavelength to pump light, thus ensure the WDM-DPSK flashlight that exports from the first highly nonlinear optical fiber 16 and ideler frequency light has higher yield value and power is substantially identical.The pump light Px, pump light Py, WDM-DPSK light and the ideler frequency light that export from the first highly nonlinear optical fiber 16 arrive polarization beam apparatus 15, and pump light Py identical for polarization direction and ideler frequency light leach by polarization beam apparatus 15, are transferred to piezoelectric ceramic 7.Pump light Py and ideler frequency light arrive polarization beam combiner 14 through piezoelectric ceramic 7 and the 3rd Polarization Controller 13 successively; And pump light Px and WDM-DPSK light directly output to polarization beam combiner 14 from polarization beam apparatus 15.It should be noted that, because piezoelectric ceramic 7 is connected with optical phase-locked loop 8, therefore can by the optical path difference regulating the control voltage of optical phase-locked loop 8 to regulate pump light Py and ideler frequency light, thus regulate the phase difference of pump light Py and ideler frequency light, to realize pump light Px, pump light Py, the phase relation of WDM-DPSK flashlight and ideler frequency light meets the initial phase relationship in the second highly nonlinear optical fiber 12 with maximum phase sensitive yield value, i.e. pump light Px, the phase place of pump light Py and the phase place with WDM-DPSK light, the difference of the phase place of ideler frequency light is-pi/2, i.e. θ
px, Py, s, i=φ
px+ φ
py-φ
i-φ
s=pi/2, wherein, θ
px, Py, s, irepresent the phase difference of four bundle light waves, φ
pxrepresent the phase place of pump light Px, φ
pyrepresent the phase place of pump light Py, φ
srepresent the phase place of flashlight, φ
irepresent the phase place of ideler frequency light, and by suppressing the disturbance of external environment to lock this phase relation, to guarantee having maximum phase sensitive gain in the second highly nonlinear optical fiber 12 and have best phase place regenerability.Then, the pump light Px of polarization beam combiner 14 output, pump light Py, WDM-DPSK light and ideler frequency light incide the second highly nonlinear optical fiber 12 simultaneously.As shown in Figure 3, second highly nonlinear optical fiber 12 can produce the phase transmission function of notch cuttype in Phase sensitive amplification process based on four-wave mixing effect, namely when the phase difference inputting light equals π, the phase difference exporting light also equals π, thus the phase noise of WDM-DPSK light signal can be removed, realize the phase place regeneration of light signal.Phase difference due to WDM-DPSK light is π, therefore can realize regenerating the phase place of WDM-DPSK light.Here it should be noted that, by regulating the drive current knob on the control panel of the 3rd erbium-doped fiber amplifier 21, regulate the drive current of the 3rd erbium-doped fiber amplifier 21, thus regulate the Output optical power of the 3rd erbium-doped fiber amplifier 21, the power of the light signal of each channel of WDM-DPSK light is increased to certain value, and the regenerator being applicable to WDM-DPSK light that the embodiment of the present invention is provided is operated in gain saturation state.When pump light Px, pump light Py, WDM-DPSK light and ideler frequency light are injected into the second highly nonlinear optical fiber 12, second highly nonlinear optical fiber 12 can produce flashlight gain transfer function, as shown in Figure 4, the power of the flashlight namely inputted is larger, its gain is less, thus ensure that the power of output signal light remains unchanged, and then inhibit the amplitude noise of signal, achieve the amplitude regeneration of light signal.
From Fig. 5, Fig. 6, Fig. 7 and Fig. 8, the dpsk signal light of two channels by before optical regenerator with by comparing after optical regenerator, the phase angle distribution of flashlight obviously reduces, and this illustrates that its phase noise all obtains obvious suppression.
It should be noted that, by regulating the direction of analyzer 11, selectivity can leach WDM-DPSK light or ideler frequency light, then pass through the residual pump light of the 3rd band pass filter 10 filtering and spontaneous radiation (ASE) noise, thus obtain WDM-DPSK light or the ideler frequency light of regeneration.When leaching the WDM-DPSK light time, illustrating and achieving signal regeneration by the embodiment of the present invention; When leaching ideler frequency light, the function being achieved wavelength convert by the embodiment of the present invention is described.
The embodiment of the present invention is compared to the phase sensitive parameter amplifying signal regenerator of the four-wave mixing effect of the degeneracy based on interference ring structure, wdm system can be applicable to very easily, avoid the phase noise caused by the sound wave Brillouin scattering (GAWBS) of guided simultaneously, there is better signal regeneration performance; The embodiment of the present invention is compared to existing wdm optical signal phase place regenerator, and its structure is simple, and cost is lower, is very suitable for practical application.In addition, the embodiment of the present invention also has good function expansibility, can by multiple regenerator cascade, to realize better signal regeneration performance.
Embodiment two:
The regenerator of what the embodiment of the present invention provided be applicable to WDM-DPSK light signal comprises: the first pump laser, the second pump laser, the first Polarization Controller, the second Polarization Controller, the first coupler, the second coupler, the first Kerr nonlinearity medium, the second Kerr nonlinearity medium, phase adjustment block, the first image intensifer, the second image intensifer, the 3rd image intensifer, the 3rd band pass filter and analyzer; The output of the second pump laser is connected with the input of the first Polarization Controller by the second image intensifer, and the output of the first Polarization Controller is connected with the first coupler; The output of the first pump laser is connected with the input of the first coupler by the first image intensifer; The output of the first coupler is connected with the input of the second coupler; WDM-DPSK light signal is incident from the input of the second Polarization Controller, and the output of the second Polarization Controller is connected with the input of the second coupler, and the output of the second coupler is connected with the second Kerr nonlinearity medium by the first Kerr nonlinearity medium.Phase adjustment block connects the two ends of the second Kerr nonlinearity medium.3rd image intensifer is arranged between the input of phase adjustment block and the second Kerr nonlinearity medium.Preferably, phase adjustment block comprises: polarization beam apparatus, polarization beam combiner, piezoelectric ceramic, optical phase-locked loop, the 3rd coupler and the 3rd Polarization Controller; Polarization beam combiner and polarization beam apparatus are arranged between the first Kerr nonlinearity medium and the 3rd image intensifer, and the first Kerr nonlinearity medium, polarization beam apparatus, polarization beam combiner and the 3rd image intensifer are linked in sequence.One end of piezoelectric ceramic is connected with polarization beam apparatus, and the other end of piezoelectric ceramic is connected with polarization beam combiner by the 3rd Polarization Controller.3rd coupler is arranged on the output of the second Kerr nonlinearity medium, and optical phase-locked loop connects piezoelectric ceramic and the 3rd coupler.Analyzer is arranged between the second Kerr nonlinearity medium and the 3rd coupler.3rd band pass filter is arranged between analyzer and the 3rd coupler.
In order to spontaneous radiation (ASE) noise that filtering is brought by image intensifer, the first band pass filter is arranged between the first image intensifer and the first coupler, the second band pass filter is arranged between the second image intensifer and the first Polarization Controller simultaneously.
Preferably, image intensifer is erbium-doped fiber amplifier, and namely the first image intensifer is the first erbium-doped fiber amplifier, and the second image intensifer is the second erbium-doped fiber amplifier, and the 3rd image intensifer is the 3rd erbium-doped fiber amplifier; Coupler is fiber coupler, and namely the first coupler is the first fiber coupler, and the second coupler is the second fiber coupler, and the 3rd coupler is the 3rd fiber coupler.Kerr nonlinearity medium comprises: highly nonlinear optical fiber and silica-based waveguides etc.In the present embodiment, Kerr nonlinearity medium is highly nonlinear optical fiber, and namely the first Kerr nonlinearity medium is the first highly nonlinear optical fiber, and the second Kerr nonlinearity medium is the second highly nonlinear optical fiber.
What the embodiment of the present invention provided is applicable to the regenerator of WDM-DPSK light signal in use, first sends out continuous print pump light Px by the first pump laser, sends out continuous print pump light Py by the second pump laser; Pump light Px is carried out power amplification by the first erbium-doped fiber amplifier.Pump light Py is carried out power amplification by the second erbium-doped fiber amplifier; First Polarization Controller carries out polarization adjustment to the pump light Py that power is exaggerated, orthogonal with the polarization direction of pump light Px to guarantee the polarization direction of the pump light Py exported from the first Polarization Controller.Pump light Px and pump light Py is coupled by the first fiber coupler again.Meanwhile, the WDM-DPSK light signal incided in the second Polarization Controller carries out Polarization Modulation through the second Polarization Controller, consistent with the polarization direction of pump light Px to guarantee the polarization direction of the WDM-DPSK flashlight exported from the second Polarization Controller.From first fiber coupler export pump light Px, pump light Py and from second Polarization Controller export WDM-DPSK light be coupled by the second fiber coupler.The first highly nonlinear optical fiber is admitted to by pump light Px, the pump light Py of the second fiber coupler coupling and WDM-DPSK light, and utilize the four-wave mixing effect in the first highly nonlinear optical fiber to generate one group of polarization direction ideler frequency light identical with the polarization direction of pump light Py, and ensure the WDM-DPSK flashlight that exports and ideler frequency light has higher yield value and power is substantially identical.Here it should be noted that, in the present embodiment, for the WDM-DPSK light with different capacity and wavelength, can by regulating the power adjustments of drive current realization to pump light of pump laser, by the adjustment regulating the knob of the output wavelength on pump laser can realize the output wavelength to pump light, thus ensure the WDM-DPSK flashlight that exports from the first highly nonlinear optical fiber and ideler frequency light has higher yield value and power is substantially identical.The pump light Px, pump light Py, WDM-DPSK light and the ideler frequency light that export from the first highly nonlinear optical fiber arrive polarization beam apparatus, and pump light Py identical for polarization direction and ideler frequency light leach by polarization beam apparatus, are transferred to piezoelectric ceramic.Pump light Py and ideler frequency light arrive polarization beam combiner through piezoelectric ceramic and the 3rd Polarization Controller successively; And pump light Px and WDM-DPSK light directly output to polarization beam combiner from polarization beam apparatus.It should be noted that, because piezoelectric ceramic is connected with optical phase-locked loop, therefore can by the optical path difference regulating the control voltage of optical phase-locked loop to regulate pump light Py and ideler frequency light, thus regulate the phase difference of pump light Py and ideler frequency light, the initial phase relationship in the second highly nonlinear optical fiber with maximum phase sensitive yield value is met with the phase relation realizing pump light Px, pump light Py, WDM-DPSK flashlight and ideler frequency light, namely pump light Px, pump light Py phase place and be-pi/2, i.e. θ with the difference of the phase place of WDM-DPSK light, the phase place of ideler frequency light
px, Py, s, i=φ
px+ φ
py-φ
i-φ
s=-pi/2, wherein, θ
px, Py, s, irepresent the phase difference of four bundle light waves, φ
pxrepresent the phase place of pump light Px, φ
pyrepresent the phase place of pump light Py, φ
srepresent the phase place of flashlight, φ
irepresent the phase place of ideler frequency light; And by suppressing the disturbance of external environment to lock this phase relation, to guarantee having maximum phase sensitive gain in the second highly nonlinear optical fiber and have best phase place regenerability.Then, the pump light Px of polarization beam combiner output, pump light Py, WDM-DPSK light and ideler frequency light incide the second highly nonlinear optical fiber simultaneously.As shown in Figure 3, second highly nonlinear optical fiber can produce the phase transmission function of notch cuttype in Phase sensitive amplification process based on four-wave mixing effect, namely when the phase difference inputting light equals π, the phase difference exporting light also equals π, thus the phase noise of WDM-DPSK light signal can be removed, realize the phase place regeneration of light signal.Phase difference due to WDM-DPSK light is π, therefore can realize regenerating the phase place of WDM-DPSK light.Here it should be noted that, by regulating the drive current knob on the control panel of the 3rd erbium-doped fiber amplifier, regulate the drive current of the 3rd erbium-doped fiber amplifier, thus regulate the Output optical power of the 3rd erbium-doped fiber amplifier, the power of the light signal of each channel of WDM-DPSK light is increased to certain value, and the regenerator being applicable to WDM-DPSK light that the embodiment of the present invention is provided is operated in gain saturation state.When pump light Px, pump light Py, WDM-DPSK light and ideler frequency light are injected into the second highly nonlinear optical fiber, second highly nonlinear optical fiber can produce flashlight gain transfer function, as shown in Figure 4, the power of the flashlight namely inputted is larger, its gain is less, thus ensure that the power of output signal light remains unchanged, and then inhibit the amplitude noise of signal, achieve the amplitude regeneration of light signal.
From Fig. 5, Fig. 6, Fig. 7 and Fig. 8, the dpsk signal light of two channels by before optical regenerator with by comparing after optical regenerator, the phase angle distribution of flashlight obviously reduces, and this illustrates that its phase noise all obtains obvious suppression.
It should be noted that, by regulating the direction of analyzer, selectivity can leach WDM-DPSK light or ideler frequency light, then pass through the residual pump light of the 3rd band pass filter filtering and spontaneous radiation (ASE) noise, thus obtain WDM-DPSK light or the ideler frequency light of regeneration.When leaching the WDM-DPSK light time, illustrating and achieving signal regeneration by the embodiment of the present invention; When leaching ideler frequency light, the function being achieved wavelength convert by the embodiment of the present invention is described.
The embodiment of the present invention is compared to the phase sensitive parameter amplifying signal regenerator of the four-wave mixing effect of the degeneracy based on interference ring structure, wdm system can be applicable to very easily, avoid the phase noise caused by the sound wave Brillouin scattering (GAWBS) of guided simultaneously, there is better signal regeneration performance; The embodiment of the present invention is compared to existing wdm optical signal phase place regenerator, and its structure is simple, and cost is lower, is very suitable for practical application.In addition, the embodiment of the present invention also has good function expansibility, can by multiple regenerator cascade, to realize better signal regeneration performance.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (7)
1. one kind is applicable to the regenerator of WDM-DPSK light signal, it is characterized in that, comprising: the first pump laser, the second pump laser, the first Polarization Controller, the second Polarization Controller, the first coupler, the second coupler, the first Kerr nonlinearity medium, the second Kerr nonlinearity medium and phase adjustment block; The output of described second pump laser is connected with the input of described first Polarization Controller, and the output of described first Polarization Controller is connected with described first coupler; The output of described first pump laser is connected with the input of described first coupler; The output of described first coupler is connected with the input of described second coupler; WDM-DPSK light signal is incident from the input of described second Polarization Controller, the output of described second Polarization Controller is connected with the input of the second coupler, and the output of described second coupler is connected with described second Kerr nonlinearity medium by described first Kerr nonlinearity medium; Described phase adjustment block connects the two ends of the second Kerr nonlinearity medium; Also comprise: the 3rd image intensifer; Described 3rd image intensifer is arranged between the input of described phase adjustment block and described second Kerr nonlinearity medium; Described phase adjustment block comprises: polarization beam apparatus, polarization beam combiner, piezoelectric ceramic, optical phase-locked loop, the 3rd coupler and the 3rd Polarization Controller; Described polarization beam apparatus and described polarization beam combiner are arranged between described first Kerr nonlinearity medium and described 3rd image intensifer, and the first Kerr nonlinearity medium, polarization beam apparatus, polarization beam combiner and the 3rd image intensifer are linked in sequence; One end of described piezoelectric ceramic is connected with polarization beam apparatus, and the other end of piezoelectric ceramic is connected with polarization beam combiner by described 3rd Polarization Controller; Described 3rd coupler is arranged on the output of described second Kerr nonlinearity medium, and described optical phase-locked loop connects piezoelectric ceramic and the 3rd coupler.
2. be applicable to the regenerator of WDM-DPSK light signal as claimed in claim 1, it is characterized in that, also comprise: first phase modulator and second phase modulator; Described first pump laser is connected with described first coupler by described first phase modulator, and described second pump laser is connected with described first Polarization Controller by described second phase modulator.
3. be applicable to the regenerator of WDM-DPSK light signal as claimed in claim 1, it is characterized in that, also comprise: the first image intensifer and the second image intensifer; Described first pump laser is connected with described first coupler by described first image intensifer, and described second pump laser is connected with described first Polarization Controller by described second image intensifer.
4. be applicable to the regenerator of WDM-DPSK light signal as claimed in claim 2, it is characterized in that, also comprise: the first image intensifer and the second image intensifer; Described first phase modulator is connected with described first coupler by described first image intensifer, and described second phase modulator is connected with described first Polarization Controller by described second image intensifer.
5. the regenerator being applicable to WDM-DPSK light signal as described in claim 3 or 4, is characterized in that, also comprise: the first band pass filter and the second band pass filter; Described first image intensifer is connected with described first coupler by described first band pass filter, and described second image intensifer is connected with described first Polarization Controller by described second band pass filter.
6. be applicable to the regenerator of WDM-DPSK light signal as claimed in claim 1, it is characterized in that, also comprise: analyzer; Described analyzer is arranged between described second Kerr nonlinearity medium and described 3rd coupler.
7. be applicable to the regenerator of WDM-DPSK light signal as claimed in claim 6, it is characterized in that, also comprise: the 3rd band pass filter; Described 3rd band pass filter is arranged between described analyzer and described 3rd coupler.
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| CN103885266B (en) * | 2014-03-13 | 2016-05-04 | 江苏金迪电子科技有限公司 | Based on the full light phase regenerating unit of biconjugate pumping phase modulated signal and method |
| CN106169690B (en) * | 2016-09-22 | 2019-11-22 | 电子科技大学 | A kind of method that Gao Zhongying mode locked fiber laser generates high repetition pulse |
| CN107579777B (en) * | 2017-08-14 | 2019-09-24 | 电子科技大学 | A kind of full light regenerator self-reacting device |
| CN108599855B (en) * | 2018-03-15 | 2020-12-01 | 电子科技大学 | Flexible and adjustable multi-level all-optical 2R regeneration device |
| CN111856836A (en) * | 2020-09-21 | 2020-10-30 | 南京信息工程大学 | Orthogonal mode optical parametric amplification method and device |
| CN112383362B (en) * | 2020-10-17 | 2021-12-03 | 北京邮电大学 | Method and system for regenerating MPSK (Multi-phase Shift keying) signal carrying ASE (amplified spontaneous emission) noise |
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| JP4504634B2 (en) * | 2003-06-05 | 2010-07-14 | 関西電力株式会社 | Optical pulse train converter |
| CN101963735A (en) * | 2010-08-17 | 2011-02-02 | 西南交通大学 | All-optical information processing scheme for polarization multiplexing system |
| CN102305985A (en) * | 2011-08-31 | 2012-01-04 | 山西大同大学 | Method and device for all-optical regeneration of high-speed differential quadrature reference phase shift keying (DQPSK) modulation signal |
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