CN103117812A - Regenerator suitable for wavelength division multiplex-differential phase shift keying (WDM-DPSK) optical signals - Google Patents
Regenerator suitable for wavelength division multiplex-differential phase shift keying (WDM-DPSK) optical signals Download PDFInfo
- Publication number
- CN103117812A CN103117812A CN2013100254821A CN201310025482A CN103117812A CN 103117812 A CN103117812 A CN 103117812A CN 2013100254821 A CN2013100254821 A CN 2013100254821A CN 201310025482 A CN201310025482 A CN 201310025482A CN 103117812 A CN103117812 A CN 103117812A
- Authority
- CN
- China
- Prior art keywords
- coupler
- wdm
- phase
- light
- dpsk
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Abstract
The invention relates to the technical field of optical signal regeneration, and discloses a regenerator suitable for wavelength division multiplex-differential phase shift keying (WDM-DPSK) optical signals. The regenerator comprises a first pump laser, a second pump laser, a first polarization controller, a second polarization controller, a first coupler, a second coupler, a first medium, a second medium and a phase regulating module. The second pump laser is connected with an input end of the first polarization controller, and an output end of the first polarization controller is connected with the first coupler. An output end of the first pump laser is connected with an input end of the first coupler. An output end of the first coupler is connected with an input end of the second coupler. The optical signals are incident from an input end of the second polarization controller, an output end of the second polarization controller is connected with the input end of the second coupler, and an output end of the second coupler is connected with the second medium through the first medium. The phase regulating module is connected with two ends of the second medium. By means of the regenerator suitable for the WDM-DPSK optical signals, regeneration of the WDM-DPSK optical signals is achieved.
Description
Technical field
The present invention relates to the optical regeneration technical field, particularly a kind of regenerator that is applicable to the WDM-DPSK light signal.
Background technology
After Fibre Optical Communication Technology occurs, optical fiber telecommunications system is keeping development fast always.In the last few years, along with the user's who uses broadband the business that number constantly increases, Fiber to the home (FTTH) extensively advances etc., people were also more and more higher to flow and the bandwidth requirement of backbone network.At present, what actual transmission system was used is the light signal of intensity modulated coding (OOK), the transmission capacity of individual channel has realized 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 has also received increasing concern simultaneously.But, along with the significantly lifting of transmission rate and the continuous increase of wavelength division multiplexing (WDM) channel number, the problems such as dispersion, nonlinear effect inevitably to transmission system, have been brought, cause shape and the frequency spectrum of light signal that distortion has all occurred, reduced the quality of signal transmission, cause the raising of the receiving terminal error rate, thereby worsened the transmission performance of system.
For this reason, the light signal of differential phase-shift keying (DPSK) (DPSK) phase-modulation has obtained more concern.This is that the DPSK light signal not only has the improvement of 3dB aspect receiving sensitivity because with respect to the OOK light signal, for optical fiber dispersion and nonlinear effect etc., higher tolerance is arranged simultaneously.Yet what adopt due to the DPSK light signal is phase encoded format, is easy to be subject to the impact of linearity and nonlinear phase noise, thereby worsens the transmission performance of DPSK light signal.The linear phase noise comes from spontaneous radiation (ASE) noise in phase-modulator and erbium-doped fiber amplifier etc., and the nonlinear phase noise is the conversion to phase noise by amplitude noise caused based on the Gordon-Mollenauer effect originated from optical fiber.In order to suppress phase noise, can use the phase place regenerator amplified based on the fiber phase sensitive parameter to realize the phase place regeneration of DPSK light signal.In addition, optical fiber can with transmission bandwidth 300nm is probably arranged, in order to utilize transmission bandwidth large in monomode fiber to meet the demand of information capacity, must in same monomode fiber, transmit the light carrier with a plurality of different wave lengths of signal, the wavelength-division multiplex technique that Here it is has extensively adopted at present simultaneously.Therefore, when dpsk signal obtains more and more the concern, the WDM-DPSK signal can greatly improve the performance of optical fiber telecommunications system in future in application.
In addition, in following optical-fiber network, wavelength shifter is to increase the optical switching network flexibility, reduces the necessary device blocked.The wavelength shifter of comparative maturity is the transducer of light-electrical-optical type at present, at first the light signal of transmission is converted into to the signal of telecommunication, after timing regeneration, produce the signal of telecommunication and the clock signal of regeneration, recycle the laser modulation of this signal of telecommunication to standard, the signal of telecommunication is converted into to light signal and realizes the wavelength translation function.But the wavelength shifter of this light-electrical-optical type must be through the conversion of the signal of telecommunication, cost is relatively high, complicated structure.In addition, because the relatively narrow and response speed of the response wave length bandwidth of the photo-detector in wavelength shifter is slow, therefore this wavelength shifter is difficult to realize the wavelength conversion of the wdm optical signal of broadband high-speed rate.
At present, the DPSK optical signal regenerator of researcher's design generally all is based on the four-wave mixing effect of the degeneracy of interference ring structure.But this optical signal regenerator generally can only be realized single-channel signal regeneration, is not suitable for wdm system, but also the impact of the phase noise that the sound wave Brillouin scattering (GAWBS) of easily being guided causes, the transmission performance of deterioration 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 high nonlinear dispersion shifted fibers, and the light signal of each channel is realized respectively to phase place regeneration.This system configuration complexity, 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 of the WDM-DPSK of being applicable to light signal, and it has realized the regeneration to the 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 adjusted module; The output of described the second pump laser is connected with the input of described the first Polarization Controller, and the output of described the first Polarization Controller is connected with described the first coupler; The output of described the first pump laser is connected with the input of described the first coupler; The output of described the first coupler is connected with the input of described the second coupler; The WDM-DPSK light signal is from the input incident of described the second Polarization Controller, the output of described the second Polarization Controller is connected with the input of the second coupler, and the output of described the second coupler is connected with described the second Kerr nonlinearity medium by described the first Kerr nonlinearity medium; Described phase adjusted module connects the two ends of the second Kerr nonlinearity medium.
Further, also comprise: the first phase-modulator and the second phase-modulator; Described the first pump laser is connected with described the first coupler by described the first phase-modulator, and described the second pump laser is connected with described the first Polarization Controller by described the second phase-modulator.
Further, also comprise: the first image intensifer and the second image intensifer; Described the first pump laser is connected with described the first coupler by described the first image intensifer, and described the second pump laser is connected with described the first Polarization Controller by described the second image intensifer.
Further, also comprise: the first image intensifer and the second image intensifer; Described the first phase-modulator is connected with described the first coupler by described the first image intensifer, and described the second phase-modulator is connected with described the first Polarization Controller by described the second image intensifer.
Further, also comprise: the first band pass filter and the second band pass filter; Described the first image intensifer is connected with described the first coupler by described the first band pass filter, and described the second image intensifer is connected with described the first Polarization Controller by described the second band pass filter.
Further, also comprise: the 3rd image intensifer; Described the 3rd image intensifer is arranged between the input of described phase adjusted module and described the second Kerr nonlinearity medium.
Further, described phase adjusted module 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 the first Kerr nonlinearity medium and described the 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 the 3rd Polarization Controller; Described the 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 adjusted module 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 the first Kerr nonlinearity medium and described the 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 the 3rd Polarization Controller; Described the 3rd coupler is arranged on the output of described the 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 the second Kerr nonlinearity medium and described the 3rd coupler.
Further, also comprise: the 3rd band pass filter; Described the 3rd band pass filter is arranged between described analyzer and described the 3rd coupler.
Beneficial effect of the present invention is:
The regenerator that is applicable to the WDM-DPSK light signal provided by the invention, first by the first Kerr nonlinearity medium, produce the ideler frequency light corresponding with WDM-DPSK light, regulate by the phase adjusted module again and lock the phase relation between pump light, flashlight and ideler frequency light, making the Phase sensitive amplification process of the second Kerr nonlinearity medium there is maximum phase sensitive gain; Then utilize the power of the 3rd image intensifer conditioning signal light that the second Kerr nonlinearity medium is operated under the gain saturation state, so just realized phase place regeneration and amplitude regeneration to the WDM-DPSK light signal simultaneously.In addition, the present invention can also select to leach ideler frequency light by regulating analyzer, thereby has realized the function of wavelength conversion, and operation and simple in structure, and cost is lower.The present invention is than the phase sensitive parameter amplifying signal regenerator of the four-wave mixing effect of the degeneracy based on the interference ring structure, can be applicable to very easily wdm system, the phase noise of simultaneously having avoided the sound wave Brillouin scattering (GAWBS) by the guiding type to cause, have better signal regeneration performance; The present invention is compared to general wdm optical signal phase place regenerator, and it is simple in structure, and cost is lower, is very suitable for practical application.In addition, the present invention also has good function expansibility, can be by a plurality of regenerator cascades, to realize better signal regeneration performance.
The accompanying drawing explanation
Fig. 1 is the structural representation of existing wdm optical signal phase place regenerator;
The structural representation of the regenerator that is applicable to the WDM-DPSK light signal that Fig. 2 provides for the embodiment of the present invention one;
The transmission of phase function of the flashlight in the second highly nonlinear optical fiber Phase sensitive amplification process in the regenerator that is applicable to the 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 in the regenerator that is applicable to the WDM-DPSK light signal that Fig. 4 provides for the embodiment of the present invention;
The PHASE DISTRIBUTION figure of the WDM-DPSK light signal that Fig. 5 is the first channel before the regenerator that is applicable to the WDM-DPSK light signal provided by the embodiment of the present invention;
The PHASE DISTRIBUTION figure of the WDM-DPSK light signal that Fig. 6 is the first channel after the regenerator that is applicable to the WDM-DPSK light signal provided by the embodiment of the present invention;
The PHASE DISTRIBUTION figure of the WDM-DPSK light signal that Fig. 7 is second channel before the regenerator that is applicable to the WDM-DPSK light signal provided by the embodiment of the present invention;
The PHASE DISTRIBUTION figure of the WDM-DPSK light signal that Fig. 8 is second channel after the regenerator that is applicable to the WDM-DPSK light signal provided by the embodiment of the present invention.
Wherein, 1-the first pump laser, 2-the first phase-modulator, 3-the first erbium-doped fiber amplifier, 4-the first band pass filter, 5-the first fiber coupler, 6-the second fiber coupler, the 7-piezoelectric ceramic, the 8-optical phase-locked loop, 9-the 3rd fiber coupler, 10-the 3rd band pass filter, the 11-analyzer, 12-the second highly nonlinear optical fiber, 13-the 3rd Polarization Controller, the 14-polarization beam combiner, the 15-polarization beam apparatus, 16-the first highly nonlinear optical fiber, 17-the first Polarization Controller, 18-the second band pass filter, 19-the second erbium-doped fiber amplifier, 20-the second Polarization Controller, 21-the 3rd erbium-doped fiber amplifier, 22-the second phase-modulator, 23-the second pump laser.
Embodiment
Reach for further setting forth the present invention technological means and the effect that predetermined goal of the invention is taked, below in conjunction with accompanying drawing and preferred embodiment, embodiment and the operation principle of the regenerator that is applicable to the WDM-DPSK light signal that foundation the present invention is proposed are elaborated.
Embodiment mono-:
Referring to Fig. 2, the regenerator that is applicable to the WDM-DPSK light signal that the embodiment of the present invention provides comprises: the first pump laser 1, the second pump laser 23, the first Polarization Controller 17, the second Polarization Controller 20, the first coupler, the second coupler, the first Kerr nonlinearity medium, the second Kerr nonlinearity medium, phase adjusted module, 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; The WDM-DPSK light signal is from the input incident 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.The phase adjusted module connects the two ends of the second Kerr nonlinearity medium.The 3rd image intensifer is arranged between the input of phase adjusted module and the second Kerr nonlinearity medium.Preferably, the phase adjusted module 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.The 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.The 3rd band pass filter 10 is arranged between analyzer 11 and the 3rd coupler.
Spontaneous radiation (ASE) noise brought by image intensifer for filtering, the 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 produced in order to suppress stimulated Brillouin scattering (SBS) that pump light causes in transmission medium, the first phase-modulator 2 is arranged between the first pump laser 1 and the first image intensifer, the 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 the first image intensifer is that the first erbium-doped fiber amplifier 3, the second image intensifers are that the second erbium-doped fiber amplifier 19, the three image intensifers are the 3rd erbium-doped fiber amplifier 21; Coupler is fiber coupler, and the first coupler is that the first fiber coupler 5, the second couplers are that the second fiber coupler 6, the three couplers are the 3rd fiber coupler 9.The Kerr nonlinearity medium comprises: highly nonlinear optical fiber and silica-based waveguides etc.In the present embodiment, the Kerr nonlinearity medium is highly nonlinear optical fiber, and the first Kerr nonlinearity medium is that the first highly nonlinear optical fiber 16, the second Kerr nonlinearity media are the second highly nonlinear optical fiber 12.
The regenerator that is applicable to the WDM-DPSK light signal that the embodiment of the present invention provides, first by the first Kerr nonlinearity medium, produce the ideler frequency light corresponding with WDM-DPSK light, regulate by the phase adjusted module again and lock the phase relation between pump light, flashlight and ideler frequency light, making the Phase sensitive amplification process of the second Kerr nonlinearity medium there is maximum phase sensitive gain; Then utilize the power of the 3rd erbium-doped fiber amplifier conditioning signal light that the second Kerr nonlinearity medium is operated under the gain saturation state, so just realized phase place regeneration and amplitude regeneration to the WDM-DPSK light signal simultaneously.
The regenerator that is applicable to the WDM-DPSK light signal that the embodiment of the present invention provides in use, at first sends out continuous pump light Px by the first pump laser 1, by the second pump laser 23, sends out continuous pump light Py; Pump light Px is through the first phase-modulator 2, and carried out power amplification by the first erbium-doped fiber amplifier 3.Pump light Py is through the second phase-modulator 22, and carried out power amplification by the second erbium-doped fiber amplifier 19; The pump light Py that the first 17 pairs of Polarization Controllers power is exaggerated carries out the polarization adjusting, to guarantee from the polarization direction of the pump light Py of the first Polarization Controller 17 output and the polarization direction quadrature of pump light Px.Pump light Px and pump light Py are 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 from the polarization direction of the WDM-DPSK flashlight of the second Polarization Controller 20 output.From pump light Px, the pump light Py of the first fiber coupler 5 outputs and the WDM-DPSK light of exporting from the second Polarization Controller 20, by the second fiber coupler 6, be coupled.Pump light Px, pump light Py and WDM-DPSK light by the second fiber coupler 6 couplings are admitted to the first highly nonlinear optical fiber 16, and utilize the four-wave mixing effect in the first highly nonlinear optical fiber 16 to generate one group of ideler frequency light that polarization direction is identical with the polarization direction of pump light Py, and guarantee the WDM-DPSK flashlight of output and ideler frequency light has higher yield value and power is basic identical.Here it should be noted that, in the present embodiment, for the WDM-DPSK light with different capacity and wavelength, can realize the power adjustments to pump light by the drive current of regulating pump laser, can realize the adjusting to the output wavelength of pump light by the knob of regulating the output wavelength on pump laser, thereby guarantee from the WDM-DPSK flashlight of the first highly nonlinear optical fiber 16 outputs and ideler frequency light has higher yield value and power is basic identical.Arrive polarization beam apparatus 15 from pump light Px, pump light Py, WDM-DPSK light and the ideler frequency light of the first highly nonlinear optical fiber 16 outputs, pump light Py and ideler frequency light that polarization beam apparatus 15 is identical by polarization direction leach, and 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 the optical path difference that can regulate pump light Py and ideler frequency light by the control voltage of regulating optical phase-locked loop 8, thereby 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 relation that has maximum phase sensitive yield value in the second highly nonlinear optical fiber 12, be pump light Px, the phase place of pump light Py and with the phase place of WDM-DPSK light, the difference of the phase place of ideler frequency light is-pi/2, be θ
px, Py, s, i=φ
px+ φ
py-φ
i-φ
s=pi/2, wherein, θ
px, Py, s, ithe phase difference that means four bundle light waves, φ
pxthe phase place that means pump light Px, φ
pythe phase place that means pump light Py, φ
sthe phase place that means flashlight, φ
ithe phase place that means ideler frequency light, and lock this phase relation by the disturbance that suppresses external environment, to guarantee in the second highly nonlinear optical fiber 12 thering is maximum phase sensitive gain and there is best phase place regenerability.Then, the pump light Px of polarization beam combiner 14 outputs, pump light Py, WDM-DPSK light and ideler frequency light incide the second highly nonlinear optical fiber 12 simultaneously.As shown in Figure 3, the second highly nonlinear optical fiber 12 can produce the transmission of phase function of notch cuttype based on four-wave mixing effect in the Phase sensitive amplification process, when the phase difference of input light equals π, the phase difference of output light also equals π, thereby the phase noise of WDM-DPSK light signal can be removed, realize the phase place regeneration of light signal.Because the phase difference of WDM-DPSK light is π, therefore can realize the phase place regeneration to WDM-DPSK light.Here it should be noted that, by the drive current knob on the control panel of regulating the 3rd erbium-doped fiber amplifier 21, regulate the drive current of the 3rd erbium-doped fiber amplifier 21, thereby regulate the Output optical power of the 3rd erbium-doped fiber amplifier 21, by the increase of output power of the light signal of each channel of WDM-DPSK light, to certain value, the regenerator that is applicable to WDM-DPSK light that the embodiment of the present invention is provided is operated in the 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, the second highly nonlinear optical fiber 12 can produce the flashlight gain transfer function, as shown in Figure 4, the power of the flashlight of input is larger, its gain is just less, thereby the power that has guaranteed output signal light remains unchanged, and then has suppressed the amplitude noise of signal, realized the amplitude regeneration of light signal.
From Fig. 5, Fig. 6, Fig. 7 and Fig. 8, the dpsk signal light of two channels by optical regenerator before with by comparing after optical regenerator, the phase angle of flashlight distributes and obviously to reduce, this illustrates that its phase noise has all obtained obvious inhibition.
It should be noted that, by regulating the direction of analyzer 11, can selectivity leach WDM-DPSK light or ideler frequency light, then by residual pump light and spontaneous radiation (ASE) noise of the 3rd band pass filter 10 filterings, thereby obtain WDM-DPSK light or the ideler frequency light of regenerating.When leaching the WDM-DPSK light time, illustrate by the embodiment of the present invention and realized signal regeneration; When leaching the ideler frequency light time, the function that has realized the wavelength conversion by the embodiment of the present invention is described.
The embodiment of the present invention is than the phase sensitive parameter amplifying signal regenerator of the four-wave mixing effect of the degeneracy based on the interference ring structure, can be applicable to very easily wdm system, the phase noise of simultaneously having avoided the sound wave Brillouin scattering (GAWBS) by the guiding type to cause, have better signal regeneration performance; The embodiment of the present invention is than existing wdm optical signal phase place regenerator, and it is simple in structure, and cost is lower, is very suitable for practical application.In addition, the embodiment of the present invention also has good function expansibility, can be by a plurality of regenerator cascades, to realize better signal regeneration performance.
Embodiment bis-:
The regenerator that is applicable to the WDM-DPSK light signal that the embodiment of the present invention provides 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 adjusted module, 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; The WDM-DPSK light signal is from the input incident 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.The phase adjusted module connects the two ends of the second Kerr nonlinearity medium.The 3rd image intensifer is arranged between the input of phase adjusted module and the second Kerr nonlinearity medium.Preferably, the phase adjusted module 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.The 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.The 3rd band pass filter is arranged between analyzer and the 3rd coupler.
Spontaneous radiation (ASE) noise for filtering is brought by image intensifer, be arranged on the first band pass filter 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 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 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.The Kerr nonlinearity medium comprises: highly nonlinear optical fiber and silica-based waveguides etc.In the present embodiment, the Kerr nonlinearity medium is highly nonlinear optical fiber, and 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.
The regenerator that is applicable to the WDM-DPSK light signal that the embodiment of the present invention provides in use, at first sends out continuous pump light Px by the first pump laser, by the second pump laser, sends out continuous pump light Py; 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; The pump light Py that the first Polarization Controller is exaggerated power carries out the polarization adjusting, to guarantee from the polarization direction of the pump light Py of the first Polarization Controller output and the polarization direction quadrature of pump light Px.Pump light Px and pump light Py are 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 from the polarization direction of the WDM-DPSK flashlight of the second Polarization Controller output.From pump light Px, the pump light Py of the first fiber coupler output and the WDM-DPSK light of exporting from the second Polarization Controller, by the second fiber coupler, be coupled.Pump light Px, pump light Py and WDM-DPSK light by the second fiber coupler coupling are admitted to the first highly nonlinear optical fiber, and utilize the four-wave mixing effect in the first highly nonlinear optical fiber to generate one group of ideler frequency light that polarization direction is identical with the polarization direction of pump light Py, and guarantee the WDM-DPSK flashlight of output and ideler frequency light has higher yield value and power is basic identical.Here it should be noted that, in the present embodiment, for the WDM-DPSK light with different capacity and wavelength, can realize the power adjustments to pump light by the drive current of regulating pump laser, can realize the adjusting to the output wavelength of pump light by the knob of regulating the output wavelength on pump laser, thereby guarantee from the WDM-DPSK flashlight of the first highly nonlinear optical fiber output and ideler frequency light has higher yield value and power is basic identical.Arrive polarization beam apparatus from pump light Px, pump light Py, WDM-DPSK light and the ideler frequency light of the first highly nonlinear optical fiber output, pump light Py and ideler frequency light that polarization beam apparatus is identical by polarization direction leach, and 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 the optical path difference that can regulate pump light Py and ideler frequency light by the control voltage of regulating optical phase-locked loop, thereby regulate the phase difference of pump light Py and ideler frequency light, meet the initial phase relation that there is maximum phase sensitive yield value in the second highly nonlinear optical fiber with the phase relation that realizes pump light Px, pump light Py, WDM-DPSK flashlight and ideler frequency light, be pump light Px, pump light Py phase place and with the difference of the phase place of the phase place of WDM-DPSK light, ideler frequency light for-pi/2, i.e. θ
px, Py, s, i=φ
px+ φ
py-φ
i-φ
s=-pi/2, wherein, θ
px, Py, s, ithe phase difference that means four bundle light waves, φ
pxthe phase place that means pump light Px, φ
pythe phase place that means pump light Py, φ
sthe phase place that means flashlight, φ
ithe phase place that means ideler frequency light; And lock this phase relation by the disturbance that suppresses external environment, to guarantee in the second highly nonlinear optical fiber thering is maximum phase sensitive gain and there is 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, the second highly nonlinear optical fiber can produce the transmission of phase function of notch cuttype based on four-wave mixing effect in the Phase sensitive amplification process, when the phase difference of input light equals π, the phase difference of output light also equals π, thereby the phase noise of WDM-DPSK light signal can be removed, realize the phase place regeneration of light signal.Because the phase difference of WDM-DPSK light is π, therefore can realize the phase place regeneration to WDM-DPSK light.Here it should be noted that, by the drive current knob on the control panel of regulating the 3rd erbium-doped fiber amplifier, regulate the drive current of the 3rd erbium-doped fiber amplifier, thereby regulate the Output optical power of the 3rd erbium-doped fiber amplifier, by the increase of output power of the light signal of each channel of WDM-DPSK light, to certain value, the regenerator that is applicable to WDM-DPSK light that the embodiment of the present invention is provided is operated in the 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, the second highly nonlinear optical fiber can produce the flashlight gain transfer function, as shown in Figure 4, the power of the flashlight of input is larger, its gain is just less, thereby the power that has guaranteed output signal light remains unchanged, and then has suppressed the amplitude noise of signal, realized the amplitude regeneration of light signal.
From Fig. 5, Fig. 6, Fig. 7 and Fig. 8, the dpsk signal light of two channels by optical regenerator before with by comparing after optical regenerator, the phase angle of flashlight distributes and obviously to reduce, this illustrates that its phase noise has all obtained obvious inhibition.
It should be noted that, by regulating the direction of analyzer, can selectivity leach WDM-DPSK light or ideler frequency light, then by residual pump light and spontaneous radiation (ASE) noise of the 3rd band pass filter filtering, thereby obtain WDM-DPSK light or the ideler frequency light of regenerating.When leaching the WDM-DPSK light time, illustrate by the embodiment of the present invention and realized signal regeneration; When leaching the ideler frequency light time, the function that has realized the wavelength conversion by the embodiment of the present invention is described.
The embodiment of the present invention is than the phase sensitive parameter amplifying signal regenerator of the four-wave mixing effect of the degeneracy based on the interference ring structure, can be applicable to very easily wdm system, the phase noise of simultaneously having avoided the sound wave Brillouin scattering (GAWBS) by the guiding type to cause, have better signal regeneration performance; The embodiment of the present invention is than existing wdm optical signal phase place regenerator, and it is simple in structure, and cost is lower, is very suitable for practical application.In addition, the embodiment of the present invention also has good function expansibility, can be by a plurality of regenerator cascades, to realize better signal regeneration performance.
It should be noted last that, above embodiment is only unrestricted in order to technical scheme of the present invention to be described, although with reference to example, the present invention is had been described in detail, those of ordinary skill in the art is to be understood that, can modify or be equal to replacement technical scheme of the present invention, and not breaking away from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of claim scope of the present invention.
Claims (10)
1. a regenerator that is applicable to the 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 adjusted module; The output of described the second pump laser is connected with the input of described the first Polarization Controller, and the output of described the first Polarization Controller is connected with described the first coupler; The output of described the first pump laser is connected with the input of described the first coupler; The output of described the first coupler is connected with the input of described the second coupler; The WDM-DPSK light signal is from the input incident of described the second Polarization Controller, the output of described the second Polarization Controller is connected with the input of the second coupler, and the output of described the second coupler is connected with described the second Kerr nonlinearity medium by described the first Kerr nonlinearity medium; Described phase adjusted module connects the two ends of the second Kerr nonlinearity medium.
2. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 1, is characterized in that, also comprises: the first phase-modulator and the second phase-modulator; Described the first pump laser is connected with described the first coupler by described the first phase-modulator, and described the second pump laser is connected with described the first Polarization Controller by described the second phase-modulator.
3. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 1, is characterized in that, also comprises: the first image intensifer and the second image intensifer; Described the first pump laser is connected with described the first coupler by described the first image intensifer, and described the second pump laser is connected with described the first Polarization Controller by described the second image intensifer.
4. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 2, is characterized in that, also comprises: the first image intensifer and the second image intensifer; Described the first phase-modulator is connected with described the first coupler by described the first image intensifer, and described the second phase-modulator is connected with described the first Polarization Controller by described the second image intensifer.
5. the regenerator that is applicable to the WDM-DPSK light signal as described as claim 3 or 4, is characterized in that, also comprises: the first band pass filter and the second band pass filter; Described the first image intensifer is connected with described the first coupler by described the first band pass filter, and described the second image intensifer is connected with described the first Polarization Controller by described the second band pass filter.
6. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 1, is characterized in that, also comprises: the 3rd image intensifer; Described the 3rd image intensifer is arranged between the input of described phase adjusted module and described the second Kerr nonlinearity medium.
7. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 1, is characterized in that, described phase adjusted module 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 the first Kerr nonlinearity medium and described the 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 the 3rd Polarization Controller; Described the 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.
8. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 6, is characterized in that, described phase adjusted module 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 the first Kerr nonlinearity medium and described the 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 the 3rd Polarization Controller; Described the 3rd coupler is arranged on the output of described the second Kerr nonlinearity medium, and described optical phase-locked loop connects piezoelectric ceramic and the 3rd coupler.
9. be applicable to as claimed in claim 7 or 8 the regenerator of WDM-DPSK light signal, it is characterized in that, also comprise: analyzer; Described analyzer is arranged between described the second Kerr nonlinearity medium and described the 3rd coupler.
10. the regenerator that is applicable to the WDM-DPSK light signal as claimed in claim 9, is characterized in that, also comprises: the 3rd band pass filter; Described the 3rd band pass filter is arranged between described analyzer and described the 3rd coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025482.1A CN103117812B (en) | 2013-01-24 | 2013-01-24 | A kind of regenerator being applicable to WDM-DPSK light signal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310025482.1A CN103117812B (en) | 2013-01-24 | 2013-01-24 | A kind of regenerator being applicable to WDM-DPSK light signal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103117812A true CN103117812A (en) | 2013-05-22 |
| CN103117812B CN103117812B (en) | 2015-08-05 |
Family
ID=48416095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310025482.1A Active CN103117812B (en) | 2013-01-24 | 2013-01-24 | A kind of regenerator being applicable to WDM-DPSK light signal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103117812B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885266A (en) * | 2014-03-13 | 2014-06-25 | 江苏金迪电子科技有限公司 | Double-conjugation pumping modulating signal all-optical regeneration device and method based on optical frequency comb |
| CN106169690A (en) * | 2016-09-22 | 2016-11-30 | 电子科技大学 | A kind of Gao Zhongying mode locked fiber laser and the method producing Gao Zhongying pulse thereof |
| CN108599855A (en) * | 2018-03-15 | 2018-09-28 | 电子科技大学 | A kind of flexibly adjustable more full light 2R regenerating units of level |
| WO2019033331A1 (en) * | 2017-08-14 | 2019-02-21 | 电子科技大学 | All-optical regenerator self-adapting apparatus |
| CN111856836A (en) * | 2020-09-21 | 2020-10-30 | 南京信息工程大学 | Orthogonal mode optical parametric amplification method and device |
| CN112383362A (en) * | 2020-10-17 | 2021-02-19 | 北京邮电大学 | Method and system for regenerating MPSK (Multi-phase Shift keying) signal carrying ASE (amplified spontaneous emission) noise |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202334535U (en) * | 2011-11-14 | 2012-07-11 | 电子科技大学 | Bi-directional multichannel light-operated optical information processing device |
-
2013
- 2013-01-24 CN CN201310025482.1A patent/CN103117812B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN202334535U (en) * | 2011-11-14 | 2012-07-11 | 电子科技大学 | Bi-directional multichannel light-operated optical information processing device |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103885266A (en) * | 2014-03-13 | 2014-06-25 | 江苏金迪电子科技有限公司 | Double-conjugation pumping modulating signal all-optical regeneration device and method based on optical frequency comb |
| 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 |
| CN106169690A (en) * | 2016-09-22 | 2016-11-30 | 电子科技大学 | A kind of Gao Zhongying mode locked fiber laser and the method producing Gao Zhongying pulse thereof |
| 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 |
| WO2019033331A1 (en) * | 2017-08-14 | 2019-02-21 | 电子科技大学 | All-optical regenerator self-adapting apparatus |
| CN108599855A (en) * | 2018-03-15 | 2018-09-28 | 电子科技大学 | A kind of flexibly adjustable more full light 2R regenerating units of level |
| CN111856836A (en) * | 2020-09-21 | 2020-10-30 | 南京信息工程大学 | Orthogonal mode optical parametric amplification method and device |
| CN112383362A (en) * | 2020-10-17 | 2021-02-19 | 北京邮电大学 | Method and system for regenerating MPSK (Multi-phase Shift keying) signal carrying ASE (amplified spontaneous emission) noise |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103117812B (en) | 2015-08-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Turukhin et al. | 105.1 Tb/s power-efficient transmission over 14,350 km using a 12-core fiber | |
| US6473214B1 (en) | Methods of and apparatus for optical signal transmission | |
| Liu et al. | Nonlinearity-free coherent transmission in hollow-core antiresonant fiber | |
| US7515834B2 (en) | Upgraded optical communication system with increased transmission capacity and method | |
| CN103117812B (en) | A kind of regenerator being applicable to WDM-DPSK light signal | |
| CN101432998A (en) | Partial DPSK (PDPSK) transmission systems | |
| US20080075463A1 (en) | WDM optical transmission system and WDM optical transmission method | |
| CN104330939A (en) | SBS broadband tunable optical fiber delay system | |
| Zhang et al. | Real-time transmission of single-carrier 400 Gb/s and 600 Gb/s 64QAM over 200km-span link | |
| Buchali et al. | Performance and advantages of 100 Gb/s QPSK/8QAM hybrid modulation formats | |
| CN102929072B (en) | Full-optical-wavelength conversion simplifying device and full-optical-wavelength conversion simplifying method of polarization multiplexing system without polarization crosstalk | |
| Busson et al. | Unrepeatered C-band transmission of 35.5 Tb/s capacity over 291 km using 128 GBd DP-16-QAM | |
| Koch et al. | Experimental demonstration of a silicon-photonics WDM NFT soliton transmitter | |
| CN110050421A (en) | A kind of device and method generating optical signal | |
| US20040047633A1 (en) | System and method for high bit-rate optical time division multiplexing (OTDM) | |
| Buchali et al. | Amplifier less 400 Gb/s coherent transmission at short reach | |
| Zhang et al. | Remotely pumped EDFA-based 40-Gb/s downstream and 10-Gb/s upstream long-reach WDM PON employing RSOA and FBG equalizer | |
| US7123835B2 (en) | Method and system for increasing the capacity and spectral efficiency of optical transmission | |
| Xiaolei et al. | Experimental investigation of wavelength division multiplexing secure communications with chaotic optical channel | |
| CN101494502B (en) | Method and apparatus for generating clear alternation mark reversion light modulation signal | |
| Yu et al. | 56Gb/s chirp-managed symbol transmission with low-cost, 10-G class LD for 400G intra-data center interconnection | |
| WO2019055362A1 (en) | Optical communication with low temporal coherence light | |
| Naughton et al. | Error-free 10Gb/s duobinary transmission over 215km of SSMF using a hybrid photonic integrated reflective modulator | |
| CN112564809B (en) | Few-mode all-optical regeneration device and method based on loop merging | |
| Arikawa | Long-Haul Transmission over Coupled MCF with Coupled Core EDFA |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |