CN108322260A - The suppressing method and system of relative phase noise in coherent optical-fiber Raman amplification system - Google Patents
The suppressing method and system of relative phase noise in coherent optical-fiber Raman amplification system Download PDFInfo
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- CN108322260A CN108322260A CN201711286670.4A CN201711286670A CN108322260A CN 108322260 A CN108322260 A CN 108322260A CN 201711286670 A CN201711286670 A CN 201711286670A CN 108322260 A CN108322260 A CN 108322260A
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 130
- 239000013307 optical fiber Substances 0.000 title claims abstract description 27
- 230000003321 amplification Effects 0.000 title claims abstract description 19
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 19
- 230000001427 coherent effect Effects 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims abstract description 46
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 238000005086 pumping Methods 0.000 claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 3
- 230000001629 suppression Effects 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000004891 communication Methods 0.000 abstract description 4
- 239000000243 solution Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000015556 catabolic process Effects 0.000 description 2
- 238000006731 degradation reaction Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000009916 joint effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
- H04B10/2916—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing using Raman or Brillouin amplifiers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/697—Arrangements for reducing noise and distortion
Abstract
It is the suppressing method and system of relative phase noise in a kind of coherent optical-fiber Raman amplification system the present invention relates to a kind of technical field of optical fiber communication, the former includes to raman pump light and being divided before first step beam splitter receives；The forward direction raman pump light of second step transmitting terminal bundling device pair 99% couples；Third step light power meter monitors the power of the 1% forward direction raman pump light in real time；4th step determines the optimum value of signal light power by feedback algorithm；The launched power of the signal light of 5th step section transmitting；The signal light for entering Transmission Fibers is amplified to raman pump light before 6th step；7th step signal receiver receives signal light.Present invention improves over the transmitting terminal of current commercialization and forward pumping structures, it is divided preceding to raman pump light by a beam splitter, the launched power of the real-time Regulate signal light of energy, compensation reduces the noise coefficient of raman amplifier partially due to the preceding receiving end signal light relative phase noise as caused by pumping light power fluctuation.
Description
Technical field
It is that relative phase is made an uproar in a kind of coherent optical-fiber Raman amplification system the present invention relates to a kind of technical field of optical fiber communication
The suppressing method and system of sound.
Background technology
With the development of Fibre Optical Communication Technology, need the fibre-optic transmission system (FOTS) distance of single spanning distance without electronic relay increasingly longer,
Transmission rate is higher and higher, the high order modulation coherent fiber communication system of especially 100G or more.In this case, using double
It is the effective ways of extended fiber transmission span to distributed raman amplifier；It, must especially in overlength span fibre system
Application scenarios must could be realized to fiber span using distributed raman amplifier and more advanced higher order modulation formats
It is required that.
Pump light will interact in Transmission Fibers with signal light in forward pumping distributed raman amplification, due to pumping
The pump light of light laser output necessarily has certain power swing, this power swing will be logical with signal light in Transmission Fibers
It crosses Cross-phase Modulation constantly to act on so that it constantly accumulates the relative phase noise of signal light, finally receiving terminal is caused to be believed
The relative phase noise degradation of number light.Higher order modulation formats limited performance pumps in forward pumping distributed raman amplification at present
Optical power fluctuation and cause receiving terminal relative phase noise degradation, advanced modulation formats such as QPSK, 16QAM's of actual use etc.
The performance of overlength span fibre system influences more serious.
Due to signal light power fluctuation and pumping light power fluctuation joint effect signal light phase change,
Relative phase noise caused by a part of pump light can be offset by the launched power of fine adjustment signal light, to improve receiving terminal
The phase noise of signal improves signal-to-noise ratio, increases the transmission range of system.
Invention content
The present invention provides the suppressing method and system of relative phase noise in a kind of coherent optical-fiber Raman amplification system, gram
The deficiency of the above-mentioned prior art has been taken, can effectively solve that relative phase noise is big in coherent optical-fiber Raman amplification system, has been caused
Signal-to-noise ratio is low, the problem of influencing transmission range.
One of technical scheme of the present invention is realized by following measures：In a kind of coherent optical-fiber Raman amplification system
The suppressing method of relative phase noise, includes the following steps：
The first step：Before being received to raman pump light, beam splitter before the transmitting of forward direction Raman pump module simultaneously to raman pump light
It is divided, 99% forward direction raman pump light is inputted into transmitting terminal bundling device, enters second step later, beam splitter is by 1%
Forward direction raman pump light input optical power meter enters third and walks later；
Second step：The forward direction raman pump light of transmitting terminal bundling device pair 99% couples, the forward direction Raman pump after coupling
Pu light enters Transmission Fibers, enters the 6th step later；
Third walks：Light power meter receives 1% forward direction raman pump light, monitors the 1% forward direction raman pump light in real time
Power, with the power swing size of this forward direction raman pump light for obtaining other 99%, and the power monitored is sent to
In feedback algorithm module, enter the 4th step later；
4th step：Feedback algorithm module receives the power, the optimum value of signal light power is determined by feedback algorithm, specifically
Process is as follows：
(1), according to the following equations of coherent optical-fiber Raman amplification system parametric solution, establish a pumping light beats with it is corresponding
Need the look-up table of signal light power changed；
Wherein, As(z, t) is the light field of signal light, αsIt is signal light attenuation coefficient, g (z) is that the differential Raman of signal light increases
Beneficial coefficient, β2It is dispersion parameters of the optical fiber near signal light, γsIt is nonlinear factor, Ap(z, t) is pump light light field；
(2), pass through feedback algorithm retrieval to when the fluctuation of Raman pump luminous power before light power meter detects
Table finds the value adjusted needed for signal light power, the as optimum value of signal light power；
(3), feedback algorithm module exports the signal light power value into signal transmitter, enters the 5th step later；
5th step：Signal transmitter controls signal light power unit according to the signal light power value, adjusts the signal of transmitting
The launched power of light, transmitting signal light to transmitting terminal bundling device, the signal light after emitted end bundling device coupling enter transmission light
Fibre enters the 6th step later；
6th step：Forward direction raman pump light is amplified the signal light for entering Transmission Fibers, enters the 7th step later；
7th step：It makes any change without the backward Raman pump optical module to receiving terminal, backward Raman pump optical mode
To raman pump light to Transmission Fibers after block transmitting, signal receiver receives signal light.
Here is the further optimization and/or improvements to foregoing invention technical solution：
The detailed process of above-mentioned 6th step is as follows：
(1), to raman pump light to receiving terminal bundling device after the transmitting of backward Raman pump optical module；
(2), receiving terminal bundling device is coupled to rear to raman pump light, and the backward raman pump light after coupling enters biography
Fibre is lost to be amplified signal light；
(3), signal light pass through receiving terminal bundling device arriving signal receiver, signal receiver by the data on signal light also
Original comes out.
Technical scheme of the present invention second is that being realized by following measures：In a kind of coherent optical-fiber Raman amplification system
The suppression system of relative phase noise, including it is preceding to Raman pump module, beam splitter, signal transmitter, light power meter, feedback calculation
Method module, transmitting terminal bundling device, Transmission Fibers, backward Raman pump optical module, receiving terminal bundling device and signal receiver；
Signal transmitter：For emitting the optical signal for carrying transmission data；
Forward direction Raman pump module：It is preceding to raman pump light for emitting；
Beam splitter：For being divided preceding to raman pump light, 99% forward direction raman pump light is transmitted for injecting
In optical fiber, 1% forward direction raman pump light is for carrying out power monitoring.
Light power meter：Power swing for the 1% forward direction raman pump light for monitoring beam splitter output；
Feedback algorithm module：It is made of feedback algorithm, for calculating the value adjusted needed for signal light power, as signal light
The optimum value of power；
Transmitting terminal bundling device：It is respectively used to signal light and forward direction Raman pump optically coupling in Transmission Fibers；
Transmission Fibers：Transmission for optical signal；
Receiving terminal bundling device：For will after to Raman pump optically coupling in Transmission Fibers；
Backward Raman pump module：For after transmitting to raman pump light；
Signal receiver：For receiving optical signal, transmission data is restored.
Present invention improves over the transmitting terminal of current commercialization and forward pumping structures, without to the backward pump positioned at receiving terminal
Pu structure is modified, and one 99 will be placed behind the forward direction Raman pump module in original forward pumping structure:1 point
Beam device is divided, and is amplified to Raman pump before its 99% pump light is used for carrying out, by its 1% pump light power meter
Power monitoring is carried out, and increases and causes receiving terminal relative phase noise to change according to the pumping light power fluctuation estimation monitored
The algorithm of size.Therefore the launched power of the real-time Regulate signal light of present invention energy, for compensating a part due to preceding as pump light
Receiving end signal light relative phase noise caused by power swing, reduces the noise coefficient of raman amplifier, increases simultaneously
The transmission range of overlength span optical fiber telecommunications system.
Description of the drawings
Attached drawing 1 is the structure diagram of the present invention.
Attached drawing 2 is the flow chart of the present invention.
Specific implementation mode
The present invention is not limited by following embodiments, can be determined according to the technique and scheme of the present invention with actual conditions specific
Embodiment.
With reference to embodiment and attached drawing, the invention will be further described：
Embodiment 1：As shown in attached drawing 1,2, the suppressing method of relative phase noise in the coherent optical-fiber Raman amplification system,
Include the following steps：
The first step：Before being received to raman pump light, beam splitter before the transmitting of forward direction Raman pump module simultaneously to raman pump light
It is divided, 99% forward direction raman pump light is inputted into transmitting terminal bundling device, enters second step later, 1% forward direction is drawn
Graceful pump light input optical power meter enters third and walks later；
Second step：The forward direction raman pump light of transmitting terminal bundling device pair 99% couples, the forward direction Raman pump after coupling
Pu light enters Transmission Fibers, enters the 6th step later；
Third walks：Light power meter receives 1% forward direction raman pump light, monitors the 1% forward direction raman pump light in real time
Power, with the power swing size of this forward direction raman pump light for obtaining other 99%, and the power monitored is sent to
In feedback algorithm module, enter the 4th step later；
4th step：Feedback algorithm module receives the power, the optimum value of signal light power is determined by feedback algorithm, specifically
Process is as follows：
(1), according to the following equations of coherent optical-fiber Raman amplification system parametric solution, establish a pumping light beats with it is corresponding
Need the look-up table of signal light power changed；
Wherein, As(z, t) is the light field of signal light, αsIt is signal light attenuation coefficient, g (z) is that the differential Raman of signal light increases
Beneficial coefficient, β2It is dispersion parameters of the optical fiber near signal light, γsIt is nonlinear factor, Ap(z, t) is pump light light field；
(2), pass through feedback algorithm retrieval to when the fluctuation of Raman pump luminous power before light power meter detects
Table finds the value adjusted needed for signal light power, the as optimum value of signal light power；
(3), enter the 5th step after feedback algorithm module exports the signal light power value into signal transmitter；
5th step：Signal transmitter controls signal light power unit according to the signal light power value, adjusts the signal of transmitting
The launched power of light, transmitting signal light to transmitting terminal bundling device, the signal light after emitted end bundling device coupling enter transmission light
Fibre enters the 6th step later；
6th step：Forward direction raman pump light is amplified the signal light for entering Transmission Fibers, enters the 7th step later；
7th step：It makes any change without the backward Raman pump optical module to receiving terminal, backward Raman pump optical mode
To raman pump light to Transmission Fibers after block transmitting, signal receiver receives signal light.
Here the beam splitter in the first step is one 99:1 beam splitter, by its 1% forward direction raman pump light power
Meter carries out power monitoring, amplifies to Raman pump before its 99% forward direction raman pump light is used for carrying out, here injection transmission
Pumping light power in optical fiber only only reduces 1%, has substantially no effect on its amplification to transmitting signal light；
It can be seen that phase deflection and signal light power and the pump light work(of signal light according to the equation in the 1st step of the 4th step
The fluctuation of rate has relationship, therefore when pumping light power increases, and can suitably reduce signal optical noise and carry out thermal compensation signal phase
Deflection；When pumping light power reduces, it can suitably increase signal light power to compensate.Feedback algorithm is for determining signal light power
The optimum value of fluctuation makes the signal-to-noise ratio of receiving terminal be optimal；
Signal transmitter controls signal light power unit according to the signal light power value in 5th step, adjusts the signal of transmitting
The launched power of light is made an uproar with a part of relative phase of receiving end signal light caused by forward direction Raman pump light beats of compensation
The deterioration of sound.
Present invention improves over the transmitting terminal of current commercialization and forward pumping structures, without to the backward pump positioned at receiving terminal
Pu structure is modified, and one 99 will be placed behind the forward direction Raman pump module in original forward pumping structure:1 point
Beam device is divided, and is amplified to Raman pump before its 99% pump light is used for carrying out, by its 1% pump light power meter
Power monitoring is carried out, and increases and causes receiving terminal relative phase noise to change according to the pumping light power fluctuation estimation monitored
The algorithm of size, so as to the launched power of real-time Regulate signal light, for compensating a part due to preceding as pumping light power wave
Receiving end signal light relative phase noise caused by dynamic, reduces the noise coefficient of raman amplifier, while increasing overlength
The transmission range of span optical fiber telecommunications system.
Here is the further optimization and/or improvements to foregoing invention technical solution：
As shown in attached drawing 1,2, the detailed process of the 6th step is as follows：
(1), to raman pump light to receiving terminal bundling device after the transmitting of backward Raman pump optical module；
(2), receiving terminal bundling device is coupled to rear to raman pump light, and the backward raman pump light after coupling enters biography
Fibre is lost to be amplified signal light；
(3), signal light pass through receiving terminal bundling device arriving signal receiver, signal receiver by the data on signal light also
Original comes out.
Embodiment 2：As shown in attached drawing 1,2, the suppression system of relative phase noise in the coherent optical-fiber Raman amplification system,
Including preceding to Raman pump module, beam splitter, signal transmitter, light power meter, feedback algorithm module, transmitting terminal bundling device, biography
Lose fine, backward Raman pump optical module, receiving terminal bundling device and signal receiver；
Signal transmitter：For emitting the optical signal for carrying transmission data；
Forward direction Raman pump module：It is preceding to raman pump light for emitting；
Beam splitter：For being divided preceding to raman pump light, 99% forward direction raman pump light is transmitted for injecting
In optical fiber, 1% forward direction raman pump light is for carrying out power monitoring.
Light power meter：Power swing for the 1% forward direction raman pump light for monitoring beam splitter output；
Feedback algorithm module：It is made of feedback algorithm, for calculating the value adjusted needed for signal light power, as signal light
The optimum value of power；
Transmitting terminal bundling device：It is respectively used to signal light and forward direction Raman pump optically coupling in Transmission Fibers；
Transmission Fibers：Transmission for optical signal；
Receiving terminal bundling device：For will after to Raman pump optically coupling in Transmission Fibers；
Backward Raman pump module：For after transmitting to raman pump light；
Signal receiver：For receiving optical signal, transmission data is restored.
Here it is 1550nm, format RZ- that the transmitting carrier wave of the emission port in optical transceiver module, which can be used, in signal transmitter
The 40G optical signals of DQPSK；Transmission Fibers can select common standard single mode optical fiber, such asSMF-28e；Also it can be selected
Ultra-low loss large effective area fiber, such asEX2000；Beam splitter is 99:1 beam splitter；Forward direction is drawn
Graceful pump module, light power meter, transmitting terminal bundling device, receiving terminal bundling device, backward Raman pump module and signal receiver are equal
For existing known technology.
The above technical characteristic constitutes highly preferred embodiment of the present invention, is imitated with stronger adaptability and best implementation
Fruit can increase and decrease non-essential technical characteristic, to meet the needs of different situations according to actual needs.
Claims (3)
1. the suppressing method of relative phase noise in a kind of coherent optical-fiber Raman amplification system, it is characterised in that including following step
Suddenly：
The first step：To raman pump light before the transmitting of forward direction Raman pump module, beam splitter to raman pump light and carries out before receiving
99% forward direction raman pump light is inputted transmitting terminal bundling device, enters second step later, by 1% forward direction Raman pump by light splitting
Pu light input optical power meter enters third and walks later；
Second step：The forward direction raman pump light of transmitting terminal bundling device pair 99% couples, the forward direction raman pump light after coupling
Into Transmission Fibers, enter the 6th step later；
Third walks：Light power meter receives 1% forward direction raman pump light, monitors the work(of the 1% forward direction raman pump light in real time
The power monitored with the power swing size of this forward direction raman pump light for obtaining other 99%, and is sent to feedback by rate
In algoritic module, enter the 4th step later；
4th step：Feedback algorithm module receives the power, and the optimum value of signal light power, detailed process are determined by feedback algorithm
It is as follows：
(1) according to the following equations of coherent optical-fiber Raman amplification system parametric solution, establish a pumping light beats in requisition for
The look-up table of the signal light power of change；
Wherein, As(z, t) is the light field of signal light, αsIt is signal light attenuation coefficient, g (z) is the differential Raman gain system of signal light
Number, β2It is dispersion parameters of the optical fiber near signal light, γsIt is nonlinear factor, Ap(z, t) is pump light light field；
(2) it, by feedback algorithm retrieval table, is found to when the fluctuation of Raman pump luminous power before light power meter detects
The value adjusted needed for signal light power, the as optimum value of signal light power；
(3) feedback algorithm module exports the signal light power value into signal transmitter, enters the 5th step later；
5th step：Signal transmitter controls signal light power unit according to the signal light power value, adjusts the signal light of transmitting
Launched power, transmitting signal light to transmitting terminal bundling device, the signal light after emitted end bundling device coupling enter Transmission Fibers, it
Enter the 6th step afterwards；
6th step：Forward direction raman pump light is amplified the signal light for entering Transmission Fibers, enters the 7th step later；
7th step：It makes any change without the backward Raman pump optical module to receiving terminal, backward Raman pump optical module hair
To raman pump light to Transmission Fibers after penetrating, signal receiver receives signal light.
2. the suppressing method of relative phase noise, feature in coherent optical-fiber Raman amplification system according to claim 1
It is that the detailed process of the 6th step is as follows：
(1) to raman pump light to receiving terminal bundling device after backward Raman pump optical module transmitting；
(2) receiving terminal bundling device is coupled to rear to raman pump light, and the backward raman pump light after coupling enters transmission light
Fibre is amplified signal light；
(3) signal light passes through receiving terminal bundling device arriving signal receiver, and signal receiver goes out the data convert on signal light
Come.
3. the suppression system of relative phase noise in a kind of coherent optical-fiber Raman amplification system, it is characterised in that including preceding to Raman
Pump module, beam splitter, signal transmitter, light power meter, feedback algorithm module, transmitting terminal bundling device, Transmission Fibers, backward drawing
Graceful pumping optical module, receiving terminal bundling device and signal receiver；
Signal transmitter：For emitting the optical signal for carrying transmission data；
Forward direction Raman pump module：It is preceding to raman pump light for emitting；
Beam splitter：For being divided preceding to raman pump light, 99% forward direction raman pump light is for injecting Transmission Fibers
In, 1% forward direction raman pump light is for carrying out power monitoring.
Light power meter：Power swing for the 1% forward direction raman pump light for monitoring beam splitter output；
Feedback algorithm module：It is made of feedback algorithm, for calculating the value adjusted needed for signal light power, as signal light power
Optimum value；
Transmitting terminal bundling device：It is respectively used to signal light and forward direction Raman pump optically coupling in Transmission Fibers；
Transmission Fibers：Transmission for optical signal；
Receiving terminal bundling device：For will after to Raman pump optically coupling in Transmission Fibers；
Backward Raman pump module：For after transmitting to raman pump light；
Signal receiver：For receiving optical signal, transmission data is restored.
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| CN201711286670.4A CN108322260B (en) | 2017-12-07 | 2017-12-07 | Method and system for suppressing relative phase noise in coherent optical fiber Raman amplification system |
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| CN201711286670.4A CN108322260B (en) | 2017-12-07 | 2017-12-07 | Method and system for suppressing relative phase noise in coherent optical fiber Raman amplification system |
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Cited By (1)
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| CN112671465A (en) * | 2020-11-24 | 2021-04-16 | 深圳市宇虹飞科技有限公司 | Method and system for compensating noise of optical communication system |
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