CN206594426U - Area of light polarization locking device based on nonlinear fiber gain polarization sensitivity of quantum - Google Patents
Area of light polarization locking device based on nonlinear fiber gain polarization sensitivity of quantum Download PDFInfo
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- CN206594426U CN206594426U CN201720285536.1U CN201720285536U CN206594426U CN 206594426 U CN206594426 U CN 206594426U CN 201720285536 U CN201720285536 U CN 201720285536U CN 206594426 U CN206594426 U CN 206594426U
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Abstract
Locking device is polarized the utility model discloses the area of light based on nonlinear fiber gain polarization sensitivity of quantum, it is characterized in that, including the optics scrambler being linked in sequence, optical amplifier, the first wavelength division multiplexer, low birefringent fiber, the second wavelength division multiplexer and optical filter, it is connected, is connected provided with the second pumping source by the second Polarization Controller with the second wavelength division multiplexer with the first wavelength division multiplexer by the first Polarization Controller provided with the first pumping source.The advantage of this device is in response to that speed is fast, easy to operate, practicality is good.
Description
Technical field
The utility model is related to area of light signal processing technology, is specifically the light based on nonlinear fiber gain polarization sensitivity of quantum
Domain polarizes locking device.
Background technology
Light wave belongs to transverse electro-magnetic wave, and polarization characteristic is one of its build-in attribute.In Fibre Optical Communication Technology, light wave polarization characteristic
The performance of partial photonic device is govern, promotes the rapid hair of various new polarization correlation function area of light signal transacting photonic devices
Exhibition.Therefore, light wave polarization evolution and its manipulation are the hot technologys of field fiber.Either polarize the solution of relevant issues still
The application of polarization-dependent effects, it is important to how to implement the manipulation to light wave polarization orientation.Always there is material in actual fiber waveguide
The microdefect of material or structure, the evolution of light wave polarization orientation in a fiber has random character, causes light wave in optical fiber inclined
The manipulation for orientation of shaking is extremely difficult.Most easy light wave polarization manipulation passive optical device is polarizer：Adjust the saturating of polarizer
Light orientation, can export linear polarized beams at any angle.The defect of the device is the light wave amplitude and light of polarizer output
Ripple input polarization orientation is closely related.It is complicated anti-that traditional active light wave polarization control method is based on optical active devices fusion
Feedback algorithm, such as population optimizing algorithm, simulated annealing optimizing algorithm, genetic algorithm etc., these algorithms are shown in actual applications
Go out efficiency and advantage, but limited at a high speed and in superelevation speed system by electronic device response speed bottleneck.
The optical fiber third-order nonlinear optical effect response time is extremely short, and non-linear gain have it is polarization correlated, therefore, base
It can implement area of light polarization to incident light wave in optical fiber third-order non-linear Polarization-Dependent Gain to lock.Traditionally, area of light polarization locking
Design includes " structure in the same direction " and " reverse geometry ".Pumping light wave and signal light-wave are in the same direction in a fiber in " structure in the same direction "
Transmission, polarization locking efficiency high, fast response time, it is adaptable to the area of light polarization locking of high-speed optical signal；However, " structure in the same direction "
The serious problems of presence are：Because pump light wave polarization is orientated random evolution in a fiber, the output of signal light-wave is set to polarize tool
There are randomness and unpredictability, and can not effectively implement to export it regulation of polarization orientation.Pump light in " reverse geometry "
Ripple and signal light-wave reverse transfer in a fiber, its advantage is that the output polarization orientation of signal light-wave is inclined by the input of pumping light wave
Orientation of shaking locking and regulation.The defect of " reverse geometry " is：Response speed is slow, and general response speed is only musec order；Pump
Pu light wave power is high, it is necessary to which 8W or more than 8W can just make signal light-wave degree of polarization be more than 0.9, and practicality is low.
Utility model content
The purpose of this utility model is to provide a kind of based on nonlinear fiber gain polarization in view of the shortcomings of the prior art
The area of light polarization locking device of correlation.
The advantage of this device is in response to that speed is fast, easy to operate, practicality is good.
This area of light polarization locking means are implemented to divide provided with second nonlinear pumping light wave to first order nonlinear pumping light wave
Cloth, reversely non-linear amplification, not only increase the polarization relevant nonlinear gain of signal light-wave and reduce non-linear pumping
The power requirement of light wave, can easily be accommodated while also taking the output polarization of signal light-wave.
Realizing the technical scheme of the utility model purpose is：
Area of light polarization locking device based on nonlinear fiber gain polarization sensitivity of quantum, including the optics being linked in sequence are disturbed partially
Device, optical amplifier, the first wavelength division multiplexer, low birefringent fiber, the second wavelength division multiplexer and optical filter, provided with first
Pumping source is connected by the first Polarization Controller with the first wavelength division multiplexer, and the second Polarization Controller is passed through provided with the second pumping source
It is connected with the second wavelength division multiplexer.
First wavelength division multiplexer is to the first pumping source after Polarization Control and disturbs signal light-wave implementation conjunction beam to the rear, forward direction
Inject low birefringent fiber；Second wavelength division multiplexer by after the second pumping source after Polarization Control to injection low birefringent fiber,
And export the signal light-wave of area of light polarization locking.
The service band of the optical amplifier covers C+L wave bands.
The low birefringent fiber is C+L wave band single-mode fibers, and the PMD Coefficient of low birefringent fiber is not more than
0.05ps/。
First pumping source is first order nonlinear pumping source, and the first pumping source is produced through the first Polarization Controller to be had really
Determine the non-linear pumping light wave of fl transmission of polarization orientation, the non-linear pumping light wave of fl transmission in low birefringent fiber with letter
The transmission direction of number light wave is identical.
Second pumping source is second nonlinear pumping source, and the second pumping source is produced through the second Polarization Controller to be had really
Determine the non-linear pumping light wave of reverse transfers of polarization orientation, the non-linear pumping light wave of reverse transfers in low birefringent fiber with letter
The first order nonlinear pumping light wave transmission direction that number light wave, the first pumping source are produced is opposite.
It is related that the non-linear pumping light wave of fl transmission implements polarization in low birefringent fiber to input lightwave signal
When stimulated Raman scattering amplifies, the non-linear pumping frequency of light wave of fl transmission is equal to signal light-wave frequency and low birefringent fiber
Raman frequency shift sum.
It is related that the non-linear pumping light wave of fl transmission implements polarization in low birefringent fiber to input lightwave signal
When parameter amplifies, the absolute value of the difference of the wavelength of the non-linear pumping light wave of fl transmission and the zero-dispersion wavelength of low birefringent fiber
Less than 10nm.
The non-linear pumping light wave of reverse transfers is real to the non-linear pumping light wave of fl transmission in low birefringent fiber
The related stimulated Raman scattering amplification of polarization is applied, the non-linear pumping frequency of light wave of reverse transfers is equal to the non-linear pump light of fl transmission
The Raman frequency shift sum of wave frequency rate and low birefringent fiber.
Area of light polarization locking means based on nonlinear fiber gain polarization sensitivity of quantum, including it is described based on nonlinear fiber
The area of light polarization locking device of gain polarization sensitivity of quantum, is comprised the following steps that：
（1）Input lightwave signal disturb partially with amplification：Signal light-wave is inputted into optics scrambler so that disturb flashlight to the rear
The degree of polarization of ripple is less than 0.10, then inputs optical amplifier by signal light-wave to the rear is disturbed, low to injecting by optical amplifier
The signal light-wave power of birefringence fiber implements control；
（2）The polarization orientation control of first order nonlinear pumping light wave：The first order nonlinear pump light of first pumping source output
Ripple inputs the first Polarization Controller, and the polarization orientation of first order nonlinear pumping light wave is implemented to control by the first Polarization Controller
System；
（3）The polarization relevant nonlinear amplification of signal light-wave：The signal light-wave after inclined, amplification will be disturbed and with determination polarization
The first order nonlinear pumping light wave of orientation the first wavelength division multiplexer of input, then closed beam by the first wavelength division multiplexer and inputted low jointly
Birefringence fiber, in low birefringent fiber, first order nonlinear pumping light wave is put to signal light-wave implementation polarization relevant nonlinear
Greatly；
（4）The polarization orientation control of second nonlinear pumping light wave：The second nonlinear pumping that second pumping source is exported
Light wave inputs the second Polarization Controller, and the polarization orientation of second nonlinear pumping light wave is implemented to control by the second Polarization Controller
System；
（5）The non-linear amplification of first order nonlinear pumping light wave：To have by the second wavelength division multiplexer and determine that polarization takes
To second nonlinear pumping light wave reversely input low birefringent fiber, in low birefringent fiber, second nonlinear pump light
Ripple implements non-linear amplification to first order nonlinear pumping light wave and nonlinear polarization is locked；
（6）Obtain the signal light-wave of polarization locking：Optical filter filters out the remnants of the second wavelength division multiplexer coupling output
Fl transmission first order nonlinear pumping light wave and remaining optical noise, obtain the signal light-wave of polarization locking.
Step（3）In, implement the related stimulated Raman scattering of polarization to signal light-wave when first order nonlinear pumping light wave and amplify
When, the peak power of the first order nonlinear pumping light wave of the first pumping source output is not more than 3.5W, second pumping source
The peak power of the second nonlinear pumping light wave of output is not more than 3.5W, and the service band of first wavelength division multiplexer is
14XXnm/15XXnm, the service band of second wavelength division multiplexer is 13XXnm/15XXnm.
Step（3）In, when first order nonlinear pumping light wave implements polarization associated arguments amplification to signal light-wave, described the
The peak power of the first order nonlinear pumping light wave of one pumping source output is less than 1W, the second order non-linear of the second pumping source output
Property pumping light wave peak power be not more than 3.5W, the operation wavelength of first wavelength division multiplexer is 1550 ± 50nm, described
The service band of second wavelength division multiplexer is 14XXnm/15XXnm.
The output polarization orientation of signal light-wave is locked and adjusted by the second Polarization Controller.
This area of light polarization locking device is provided with the non-linear pumping light wave of two ranks, wherein：First order nonlinear pumping light wave with
Signal light-wave symport, and implement efficient nonlinear polarization locking to signal light-wave；Second nonlinear pumping light wave and one
The non-linear pumping light wave reverse transfer of rank, and nonlinear polarization locking is implemented to first order nonlinear pumping light wave.
The advantage of this device is in response to that speed is fast, easy to operate, practicality is good.
This area of light polarization locking means are implemented to divide provided with second nonlinear pumping light wave to first order nonlinear pumping light wave
Cloth, reversely non-linear amplification, not only increase the polarization relevant nonlinear gain of signal light-wave and reduce non-linear pumping
The power requirement of light wave, can easily be accommodated while also taking the output polarization of signal light-wave.
Brief description of the drawings
Fig. 1 is the structural representation of device in embodiment；
Fig. 2 is the method flow schematic diagram of embodiment.
In figure, the low birefringent fiber 5. second of 1. optics scrambler, 2. 3. first wavelength division multiplexer of optical amplifier 4.
The Polarization Controller 10. of 8. first pumping source of wavelength division multiplexer 6. optical filter, 7. first Polarization Controller 9. second
Two pumping sources.
Embodiment
The utility model content is further elaborated with reference to the accompanying drawings and examples, but is not to of the present utility model
Limit.
Embodiment：
Reference picture 1, the area of light polarization locking device based on nonlinear fiber gain polarization sensitivity of quantum, including be linked in sequence
Optics scrambler 1, optical amplifier 2, the first wavelength division multiplexer 3, low birefringent fiber 4, the second wavelength division multiplexer 5 and optics filter
Ripple device 6, is connected provided with the first pumping source 8 by the first Polarization Controller 7 with the first wavelength division multiplexer 3, provided with the second pumping source
10 are connected by the second Polarization Controller 9 with the second wavelength division multiplexer 5.
First wavelength division multiplexer 3 is to the first pumping source 8 after Polarization Control and disturbs signal light-wave implementation conjunction beam to the rear, preceding
To injection low birefringent fiber 4；Second wavelength division multiplexer 5 by after the second pumping source 10 after Polarization Control to injection low-birefringence
Optical fiber 4, and export the signal light-wave of area of light polarization locking.
The service band of the optical amplifier 2 covers C+L wave bands.
The low birefringent fiber 4 is C+L wave band single-mode fibers, and the PMD Coefficient of low birefringent fiber 4 is not more than
0.05ps/。
First pumping source 8 is first order nonlinear pumping source, and the first pumping source 8 produces tool through the first Polarization Controller 7
There is the non-linear pumping light wave of fl transmission for determining polarization orientation, the non-linear pumping light wave of fl transmission is in low birefringent fiber 4
In it is identical with the transmission direction of signal light-wave.
Second pumping source 10 is second nonlinear pumping source, and the second pumping source 10 is produced through the second Polarization Controller 9
With the non-linear pumping light wave of reverse transfers for determining polarization orientation, the non-linear pumping light wave of reverse transfers is in low birefringent fiber
It is opposite with the first order nonlinear pumping light wave transmission direction that signal light-wave, the first pumping source 8 are produced in 4.
It is related that the non-linear pumping light wave of fl transmission implements polarization in low birefringent fiber 4 to input lightwave signal
When stimulated Raman scattering amplifies, the non-linear pumping frequency of light wave of fl transmission is equal to signal light-wave frequency and low birefringent fiber 4
Raman frequency shift sum.
It is related that the non-linear pumping light wave of fl transmission implements polarization in low birefringent fiber 4 to input lightwave signal
Parameter amplify when, the difference of the wavelength of the non-linear pumping light wave of fl transmission and the zero-dispersion wavelength of low birefringent fiber 4 it is absolute
Value is less than 10nm.
The non-linear pumping light wave of reverse transfers is real to the non-linear pumping light wave of fl transmission in low birefringent fiber 4
The related stimulated Raman scattering amplification of polarization is applied, the non-linear pumping frequency of light wave of reverse transfers is equal to the non-linear pump light of fl transmission
The Raman frequency shift sum of wave frequency rate and low birefringent fiber 4.
Reference picture 2, the area of light polarization locking means based on nonlinear fiber gain polarization sensitivity of quantum, including it is described based on light
The polarization correlated area of light polarization locking device of fine non-linear gain, is comprised the following steps that：
（1）Input lightwave signal disturb partially with amplification：Signal light-wave is inputted into optics scrambler so that disturb flashlight to the rear
The degree of polarization of ripple is less than 0.10, then inputs optical amplifier by signal light-wave to the rear is disturbed, low to injecting by optical amplifier
The signal light-wave power of birefringence fiber implements control；
（2）The polarization orientation control of first order nonlinear pumping light wave：The first order nonlinear pump light of first pumping source output
Ripple inputs the first Polarization Controller, and the polarization orientation of first order nonlinear pumping light wave is implemented to control by the first Polarization Controller
System；
（3）The polarization relevant nonlinear amplification of signal light-wave：The signal light-wave after inclined, amplification will be disturbed and with determination polarization
The first order nonlinear pumping light wave of orientation the first wavelength division multiplexer of input, then closed beam by the first wavelength division multiplexer and inputted low jointly
Birefringence fiber, in low birefringent fiber, first order nonlinear pumping light wave is put to signal light-wave implementation polarization relevant nonlinear
Greatly；
（4）The polarization orientation control of second nonlinear pumping light wave：The second nonlinear pumping that second pumping source is exported
Light wave inputs the second Polarization Controller, and the polarization orientation of second nonlinear pumping light wave is implemented to control by the second Polarization Controller
System；
（5）The non-linear amplification of first order nonlinear pumping light wave：To have by the second wavelength division multiplexer and determine that polarization takes
To second nonlinear pumping light wave reversely input low birefringent fiber, in low birefringent fiber, second nonlinear pump light
Ripple implements non-linear amplification to first order nonlinear pumping light wave and nonlinear polarization is locked；
（6）Obtain the signal light-wave of polarization locking：Optical filter filters out the remnants of the second wavelength division multiplexer coupling output
Fl transmission first order nonlinear pumping light wave and remaining optical noise, obtain the signal light-wave of polarization locking.
In this example：
First order nonlinear pumping light wave is implemented the related stimulated Raman scattering of polarization to signal light-wave and amplified；
The output polarization orientation of the signal light-wave is locked and adjusted by the second Polarization Controller 9.
Input lightwave signal wavelength is located at C-band, specially 1550nm, and its input power is -10dBm；
The center operating wavelength of optics scrambler 1 is 1550nm, and output degree of polarization is less than 5%；
The service band of optical amplifier 2 covers C-band, and its saturation output power is 25dBm, noise coefficient 3.3-
5.8dB；
The service band of first wavelength division multiplexer 3 is 1455nm/1550nm, and the service band of the second wavelength division multiplexer 5 is
1365nm/1550nm；
Low birefringent fiber 4 is run in C+L wave bands for single mode, and its Raman frequency shift is 13.2THz, and Raman gain coefficienct is
0.76/W/km, PMD Coefficient is 0.02ps.km-1/2, fiber lengths are 3.25km；
The first order nonlinear pumping optical wavelength of first pumping source 8 output is 1451nm, and watt level is 3.5W；
The second nonlinear pumping optical wavelength of second pumping source 10 output is 1364nm, and watt level is 3.5W；
The polarization Stokes vector of second nonlinear pumping light wave of second pumping source 10 output is specially（0,1,0）.
Detailed process is：
（1）Input lightwave signal disturb partially with amplification：It is υ by frequencysSignal light-wave input optics scrambler 1 so that
The degree of polarization for disturbing signal light-wave to the rear is less than 0.05, to reduce the power fluctuation of polarization locking signal light wave, improves polarization locking
The optical s/n ratio of signal light-wave；Then, signal light-wave input optical amplifier 2 to the rear will be disturbed, passes through the optical amplifier 2
Control is implemented to the power of signal light-wave, makes signal light-wave with first order nonlinear pumping light wave in Raman frequency shift Δ υB =
Stimulated raman scattering in 13.2THz low birefringent fiber 4 is fully carried out, and then obtains maximum signal light-wave polarization
Degree.
（2）The polarization orientation control of first order nonlinear pumping light wave：The frequency of first pumping source 8 output is υB1Single order it is non-
Linear pump light wave inputs the first Polarization Controller 7, by first Polarization Controller 7 to first order nonlinear pumping light wave
Polarization orientation implements control, is exported with the signal light-wave degree of polarization for obtaining maximum；
The frequency υ of first order nonlinear pumping light waveB1With the frequency υ of signal light-waves, low birefringent fiber 4 Raman frequency shift
ΔυBMeet：υB1 = υs + ΔυB。
（3）The polarization relevant nonlinear amplification of signal light-wave:Signal partially, after amplification is disturbed by 3 pairs of the first wavelength division multiplexer
Light wave and implement to close beam with the first order nonlinear pumping light wave for determining polarization orientation and input low birefringent fiber 4；Described
In low birefringent fiber 4, first order nonlinear pumping light wave is implemented the related stimulated Raman scattering of polarization to signal light-wave and amplified, and makes light
The polarization evolution of signal light-wave is locked by the polarization orientation of first order nonlinear pumping light wave in fibre.
（4）The polarization orientation control of second nonlinear pumping light wave:The frequency that second pumping source 10 is exported is υB2Two
The non-linear pumping light wave of rank inputs the second Polarization Controller 9, by second Polarization Controller 9 to second nonlinear pump light
The polarization orientation of ripple implements control；
The frequency υ of second nonlinear pumping light waveB2With the frequency υ of first order nonlinear pumping light waveB1, low birefringent fiber 4
Raman frequency shift Δ υBMeet：υB2 = υB1 + ΔυB。
（5）The non-linear amplification of first order nonlinear pumping light wave:To be had by the second wavelength division multiplexer 5 and determine polarization orientation
Second nonlinear pumping light wave reversely input low birefringent fiber 4；In the low birefringent fiber 4, second nonlinear pump
Pu light wave is implemented the related stimulated Raman scattering of polarization to first order nonlinear pumping light wave and amplified, and makes first order nonlinear pumping light wave
Polarization state is locked by the polarization orientation of second nonlinear pumping light wave, and and then makes the polarization state of signal light-wave by second nonlinear
The polarization orientation locking of pumping light wave.
（6）Obtain the signal light-wave of polarization locking：Optical filter 6 filters out the coupling of the second wavelength division multiplexer 5 output
Remaining first order nonlinear pumping light wave and remaining optical noise, obtain polarization locking signal light-wave；The output of signal light-wave
Polarization orientation regulation is implemented to complete by the second Polarization Controller 9.
The output degree of polarization of the signal light-wave exported through optical filter is more than 0.9；
The polarization locking bandwidth of area of light polarization locking device signal light-wave based on nonlinear fiber gain polarization sensitivity of quantum
More than 6THz；
As the second pumping source 10 of second nonlinear pumping light wave first order nonlinear pumping light wave is implemented it is distributed by
Swash Raman scattering amplification, first order nonlinear pumping light wave is kept higher power transmission in low birefringent fiber 4, add one
Polarization related Raman gain of the non-linear pumping light wave of rank to signal light-wave, effectively reduces the defeated of first order nonlinear pumping light wave
Enter power requirement, improve polarization locking efficiency.
Claims (6)
1. the area of light polarization locking device based on nonlinear fiber gain polarization sensitivity of quantum, it is characterized in that, including be linked in sequence
Optics scrambler, optical amplifier, the first wavelength division multiplexer, low birefringent fiber, the second wavelength division multiplexer and optical filter,
It is connected provided with the first pumping source by the first Polarization Controller with the first wavelength division multiplexer, it is inclined by second provided with the second pumping source
The controller that shakes is connected with the second wavelength division multiplexer.
2. the area of light polarization locking device according to claim 1 based on nonlinear fiber gain polarization sensitivity of quantum, it is special
Levying is, first pumping source is first order nonlinear pumping source, and the first pumping source is produced to have through the first Polarization Controller and determined
The non-linear pumping light wave of fl transmission of polarization orientation, the non-linear pumping light wave of fl transmission in low birefringent fiber with signal
The transmission direction of light wave is identical.
3. the area of light polarization locking device according to claim 1 based on nonlinear fiber gain polarization sensitivity of quantum, it is special
Levying is, second pumping source is second nonlinear pumping source, and the second pumping source is produced to have through the second Polarization Controller and determined
The non-linear pumping light wave of reverse transfers of polarization orientation, the non-linear pumping light wave of reverse transfers in low birefringent fiber with signal
The first order nonlinear pumping light wave transmission direction that light wave, the first pumping source are produced is opposite.
4. the area of light polarization locking device according to claim 2 based on nonlinear fiber gain polarization sensitivity of quantum, it is special
Levying is, implementing the related excited Raman of polarization to signal light-wave in low birefringent fiber when the non-linear pumping light wave of fl transmission puts
When big, the non-linear pumping frequency of light wave of fl transmission be equal to signal light-wave frequency and low birefringent fiber Raman frequency shift it
With.
5. the area of light polarization locking device according to claim 2 based on nonlinear fiber gain polarization sensitivity of quantum, it is special
Levying is, when the non-linear pumping light wave of fl transmission implements polarization associated arguments amplification in low birefringent fiber to signal light-wave
When, the absolute value of the difference of the zero-dispersion wavelength of the non-linear pumping optical wavelength of fl transmission and low birefringent fiber is less than
10nm。
6. the area of light polarization locking device according to claim 3 based on nonlinear fiber gain polarization sensitivity of quantum, it is special
Levying is, the non-linear pumping frequency of light wave of reverse transfers is equal to the non-linear pumping frequency of light wave of fl transmission and low birefringent light
Fine Raman frequency shift sum.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106842765A (en) * | 2017-03-23 | 2017-06-13 | 桂林电子科技大学 | Area of light polarization locking device and locking means based on nonlinear fiber gain polarization sensitivity of quantum |
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| CN106842765A (en) * | 2017-03-23 | 2017-06-13 | 桂林电子科技大学 | Area of light polarization locking device and locking means based on nonlinear fiber gain polarization sensitivity of quantum |
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