CN108322260B - Method and system for suppressing relative phase noise in coherent optical fiber Raman amplification system - Google Patents
Method and system for suppressing relative phase noise in coherent optical fiber Raman amplification system Download PDFInfo
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- 238000001069 Raman spectroscopy Methods 0.000 title claims abstract description 146
- 239000013307 optical fiber Substances 0.000 title claims abstract description 50
- 230000003321 amplification Effects 0.000 title claims abstract description 21
- 238000003199 nucleic acid amplification method Methods 0.000 title claims abstract description 21
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- 230000001427 coherent effect Effects 0.000 title claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 57
- 230000005540 biological transmission Effects 0.000 claims abstract description 52
- 238000005086 pumping Methods 0.000 claims abstract description 32
- 239000000835 fiber Substances 0.000 claims abstract description 26
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- 238000010168 coupling process Methods 0.000 claims abstract description 10
- 238000005859 coupling reaction Methods 0.000 claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 239000006185 dispersion Substances 0.000 claims description 4
- 230000001629 suppression Effects 0.000 claims description 2
- 238000004891 communication Methods 0.000 abstract description 6
- 230000002401 inhibitory effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 230000002457 bidirectional effect Effects 0.000 description 1
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- 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
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- 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
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- 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
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- 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
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- 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
The invention relates to the technical field of optical fiber communication, in particular to a method and a system for inhibiting relative phase noise in a coherent optical fiber Raman amplification system, wherein the method comprises the following steps that a beam splitter receives forward Raman pump light and splits the forward Raman pump light; coupling 99% of the forward Raman pump light by using a transmitting end beam combiner; thirdly, monitoring the power of the 1% forward Raman pump light in real time by an optical power meter; fourthly, determining the optimal value of the signal light power through a feedback algorithm; fifthly, adjusting the fiber entering power of the transmitted signal light; sixthly, amplifying the signal light entering the transmission optical fiber by the forward Raman pump light; the seventh step is that the signal receiver receives the signal light. The invention improves the prior commercial transmitting end and the forward pumping structure, splits the forward Raman pumping light through a beam splitter, can adjust the fiber entering power of the signal light in real time, compensates part of the relative phase noise of the signal light at the receiving end caused by the power fluctuation of the forward image pumping light, and reduces the noise coefficient of the Raman amplifier.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a method and a system for suppressing relative phase noise in a coherent optical fiber Raman amplification system.
Background
With the development of optical fiber communication technology, the distance of an optical fiber transmission system requiring a single-span electrical-free relay is longer, and the transmission rate is higher, especially for a high-order modulation coherent optical fiber communication system above 100G. In this case, the use of a bidirectional distributed raman amplifier is an effective method for extending the transmission span of an optical fiber; especially in an ultra-long span optical fiber system, a distributed raman amplifier and a more advanced high-order modulation format must be adopted to meet the requirement of an application scene on the optical fiber span.
The pump light in the forward pump distributed Raman amplification interacts with the signal light in the transmission fiber, and the pump light output by the pump light laser has certain power fluctuation which continuously acts with the signal light through cross phase modulation in the transmission fiber, so that the relative phase noise of the signal light is continuously accumulated, and finally the relative phase noise of the signal light at a receiving end is degraded. At present, the performance of a high-order modulation format is limited by the relative phase noise degradation of a receiving end caused by the pump light power fluctuation in the forward pump distributed raman amplification, and the performance influence of an actually used super-long span optical fiber system with a high-order modulation format such as QPSK, 16QAM and the like is more serious.
Because the fluctuation of the signal light power and the fluctuation of the pump light power jointly influence the phase change of the signal light, the relative phase noise caused by a part of pump light can be counteracted by finely adjusting the fiber-entering power of the signal light, so that the phase noise of the signal at the receiving end is improved, the signal-to-noise ratio is improved, and the transmission distance of the system is increased.
Disclosure of Invention
The invention provides a method and a system for inhibiting relative phase noise in a coherent optical fiber Raman amplification system, overcomes the defects of the prior art, and can effectively solve the problems of low signal-to-noise ratio and influence on transmission distance caused by large relative phase noise in the coherent optical fiber Raman amplification system.
One of the technical schemes of the invention is realized by the following measures: a method for suppressing relative phase noise in a coherent fiber Raman amplification system comprises the following steps:
the first step is as follows: the method comprises the following steps that a forward Raman pump module emits forward Raman pump light, a beam splitter receives the forward Raman pump light and splits the forward Raman pump light, 99% of the forward Raman pump light is input into a transmitting end beam combiner, then the second step is carried out, 1% of the forward Raman pump light is input into a light power meter through the beam splitter, and then the third step is carried out;
the second step is that: coupling 99% of the forward Raman pump light by using a transmitting end beam combiner, enabling the coupled forward Raman pump light to enter a transmission optical fiber, and then entering the sixth step;
the third step: the optical power meter receives 1% of the forward Raman pump light, monitors the power of the 1% of the forward Raman pump light in real time to obtain the power fluctuation of the other 99% of the forward Raman pump light, sends the monitored power to the feedback algorithm module, and then enters the fourth step;
the fourth step: the feedback algorithm module receives the power and determines the optimal value of the signal light power through a feedback algorithm, and the specific process is as follows:
(1) solving the following equation according to the parameters of the coherent optical fiber Raman amplification system, and establishing a lookup table of the pump light fluctuation and the corresponding signal light power needing to be changed;
wherein A iss(z, t) is the optical field of the signal light, αsIs a signal light attenuation coefficient, g (z) is a differential Raman gain coefficient of the signal light, β2Is the dispersion parameter, gamma, of the fiber in the vicinity of the signal lightsCoefficient of non-linearity, Ap(z, t) is the pump light field;
(2) when the optical power meter detects the fluctuation of the forward Raman pump optical power, searching the lookup table through a feedback algorithm to find a value required to be adjusted by the signal optical power, namely the optimal value of the signal optical power;
(3) the feedback algorithm module outputs the signal light power value to a signal transmitter, and then the fifth step is carried out;
the fifth step: the signal transmitter controls the signal light power unit according to the signal light power value, adjusts the fiber-entering power of the transmitted signal light, transmits the signal light to the transmitting end beam combiner, and the signal light coupled by the transmitting end beam combiner enters the transmission optical fiber and then enters the sixth step;
and a sixth step: amplifying the signal light entering the transmission optical fiber by the forward Raman pump light, and then entering a seventh step;
the seventh step: the backward Raman pump optical module at the receiving end is not required to be changed, backward Raman pump light is emitted to the transmission optical fiber by the backward Raman pump optical module, and the signal receiver receives the signal light.
The following is further optimization or/and improvement of the technical scheme of the invention:
the concrete process of the sixth step is as follows:
(1) the backward Raman pumping optical module transmits backward Raman pumping light to the receiving end beam combiner;
(2) the receiving end beam combiner couples the backward Raman pump light, and the coupled backward Raman pump light enters the transmission optical fiber to amplify the signal light;
(3) and the signal light reaches the signal receiver through the receiving end beam combiner, and the signal receiver restores the data on the signal light.
The second technical scheme of the invention is realized by the following measures: a suppression system of relative phase noise in a coherent fiber Raman amplification system comprises a forward Raman pumping module, a beam splitter, a signal transmitter, an optical power meter, a feedback algorithm module, a transmitting end beam combiner, a transmission fiber, a backward Raman pumping optical module, a receiving end beam combiner and a signal receiver;
a signal transmitter: for transmitting an optical signal carrying transmission data;
a forward Raman pump module: for emitting forward Raman pump light;
a beam splitter: the optical fiber is used for splitting forward Raman pump light, 99% of the forward Raman pump light is used for being injected into the transmission optical fiber, and 1% of the forward Raman pump light is used for power monitoring.
An optical power meter: the power fluctuation of 1% of the forward Raman pump light output by the beam splitter is monitored;
a feedback algorithm module: the feedback algorithm is used for calculating a value required to be adjusted by the signal light power, namely the optimal value of the signal light power;
a transmitting end beam combiner: the forward Raman pump light source is used for coupling the signal light and the forward Raman pump light into a transmission optical fiber respectively;
a transmission optical fiber: for transmission of optical signals;
a receiving end beam combiner: for coupling backward Raman pump light into the transmission fiber;
backward Raman pump module: used for emitting backward Raman pump light;
the signal receiver: used for receiving optical signals and restoring transmission data.
The invention improves the commercial transmitting end and the forward pumping structure at present, and does not need to change the backward pumping structure at the receiving end, a 99:1 beam splitter is arranged behind the forward Raman pumping module in the original forward pumping structure for splitting light, 99% of the pumping light is used for amplifying the forward Raman pumping, 1% of the pumping light is monitored by a power meter for power, and an algorithm for estimating the change of the relative phase noise of the receiving end according to the monitored power fluctuation of the pumping light is added. Therefore, the invention can adjust the fiber-entering power of the signal light in real time, is used for compensating part of the relative phase noise of the signal light at the receiving end caused by the power fluctuation of the front image pump light, reduces the noise coefficient of the Raman amplifier and increases the transmission distance of the ultra-long span optical fiber communication system.
Drawings
FIG. 1 is a block diagram of the present invention.
FIG. 2 is a flow chart of the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
example 1: as shown in fig. 1 and 2, the method for suppressing relative phase noise in a coherent fiber raman amplification system includes the following steps:
the first step is as follows: the method comprises the following steps that a forward Raman pump module emits forward Raman pump light, a beam splitter receives the forward Raman pump light and splits the forward Raman pump light, 99% of the forward Raman pump light is input into a transmitting end beam combiner, then the second step is carried out, 1% of the forward Raman pump light is input into a light power meter, and then the third step is carried out;
the second step is that: coupling 99% of the forward Raman pump light by using a transmitting end beam combiner, enabling the coupled forward Raman pump light to enter a transmission optical fiber, and then entering the sixth step;
the third step: the optical power meter receives 1% of the forward Raman pump light, monitors the power of the 1% of the forward Raman pump light in real time to obtain the power fluctuation of the other 99% of the forward Raman pump light, sends the monitored power to the feedback algorithm module, and then enters the fourth step;
the fourth step: the feedback algorithm module receives the power and determines the optimal value of the signal light power through a feedback algorithm, and the specific process is as follows:
(1) solving the following equation according to the parameters of the coherent optical fiber Raman amplification system, and establishing a lookup table of the pump light fluctuation and the corresponding signal light power needing to be changed;
wherein A iss(z, t) is the optical field of the signal light, αsIs a signal light attenuation coefficient, g (z) is a differential Raman gain coefficient of the signal light, β2Is the dispersion parameter, gamma, of the fiber in the vicinity of the signal lightsCoefficient of non-linearity, Ap(z, t) is the pump light field;
(2) when the optical power meter detects the fluctuation of the forward Raman pump optical power, searching the lookup table through a feedback algorithm to find a value required to be adjusted by the signal optical power, namely the optimal value of the signal optical power;
(3) the feedback algorithm module outputs the signal light power value to the signal transmitter and then enters the fifth step;
the fifth step: the signal transmitter controls the signal light power unit according to the signal light power value, adjusts the fiber-entering power of the transmitted signal light, transmits the signal light to the transmitting end beam combiner, and the signal light coupled by the transmitting end beam combiner enters the transmission optical fiber and then enters the sixth step;
and a sixth step: amplifying the signal light entering the transmission optical fiber by the forward Raman pump light, and then entering a seventh step;
the seventh step: the backward Raman pump optical module at the receiving end is not required to be changed, backward Raman pump light is emitted to the transmission optical fiber by the backward Raman pump optical module, and the signal receiver receives the signal light.
The beam splitter in the first step is a 99:1 beam splitter, 1% of forward Raman pump light of the beam splitter is subjected to power monitoring by a power meter, 99% of forward Raman pump light of the beam splitter is used for forward Raman pump amplification, the power of the pump light injected into the transmission optical fiber is only reduced by 1%, and the amplification of the transmission signal light is not influenced basically;
according to the equation in the step 1 of the fourth step, the phase deflection of the signal light is related to the fluctuation of the power of the signal light and the power of the pump light, so that when the power of the pump light is increased, the noise of the signal light can be properly reduced to compensate the phase deflection of the signal; when the pump light power is reduced, the signal light power can be properly increased to compensate. The feedback algorithm is used for determining the optimal value of the signal light power fluctuation, so that the signal-to-noise ratio of the receiving end is optimal;
and in the fifth step, the signal transmitter controls the signal light power unit according to the signal light power value, and adjusts the fiber incoming power of the transmitted signal light so as to compensate the deterioration of the relative phase noise of the signal light at the receiving end caused by the fluctuation of the forward Raman pump light.
The invention improves the current commercial transmitting end and forward pumping structure without changing the backward pumping structure at the receiving end, places a 99:1 beam splitter behind the forward Raman pumping module in the original forward pumping structure to split light, uses 99% of the pumping light to amplify the forward Raman pumping, uses a power meter to monitor the power of 1% of the pumping light, and adds an algorithm for estimating the change of the receiving end relative phase noise according to the monitored pumping light power fluctuation, thereby adjusting the fiber entering power of signal light in real time, compensating a part of receiving end relative phase noise caused by the front image pumping light power fluctuation, reducing the noise coefficient of the Raman amplifier, and increasing the transmission distance of the ultra-long span optical fiber communication system.
The following is further optimization or/and improvement of the technical scheme of the invention:
as shown in fig. 1 and 2, the sixth step is implemented as follows:
(1) the backward Raman pumping optical module transmits backward Raman pumping light to the receiving end beam combiner;
(2) the receiving end beam combiner couples the backward Raman pump light, and the coupled backward Raman pump light enters the transmission optical fiber to amplify the signal light;
(3) and the signal light reaches the signal receiver through the receiving end beam combiner, and the signal receiver restores the data on the signal light.
Example 2: as shown in fig. 1 and 2, the system for suppressing relative phase noise in a coherent fiber raman amplification system includes a forward raman pumping module, a beam splitter, a signal transmitter, an optical power meter, a feedback algorithm module, a transmitting end beam combiner, a transmission fiber, a backward raman pumping optical module, a receiving end beam combiner, and a signal receiver;
a signal transmitter: for transmitting an optical signal carrying transmission data;
a forward Raman pump module: for emitting forward Raman pump light;
a beam splitter: the optical fiber is used for splitting forward Raman pump light, 99% of the forward Raman pump light is used for being injected into the transmission optical fiber, and 1% of the forward Raman pump light is used for power monitoring.
An optical power meter: the power fluctuation of 1% of the forward Raman pump light output by the beam splitter is monitored;
a feedback algorithm module: the feedback algorithm is used for calculating a value required to be adjusted by the signal light power, namely the optimal value of the signal light power;
a transmitting end beam combiner: the forward Raman pump light source is used for coupling the signal light and the forward Raman pump light into a transmission optical fiber respectively;
a transmission optical fiber: for transmission of optical signals;
a receiving end beam combiner: for coupling backward Raman pump light into the transmission fiber;
backward Raman pump module: used for emitting backward Raman pump light;
the signal receiver: used for receiving optical signals and restoring transmission data.
The signal transmitter can be used in optical transceiver moduleThe transmitting port of the optical transceiver transmits 40G optical signals with the carrier wave of 1550nm and the format of RZ-DQPSK; the transmission fiber may be a common standard single mode fiber, such as
SMF-28 e; alternatively, ultra-low loss large effective area fibers may be used, e.g.
EX 2000; the beam splitter is a 99:1 beam splitter; the forward Raman pump module, the optical power meter, the transmitting end beam combiner, the receiving end beam combiner, the backward Raman pump module and the signal receiver are all the prior known technologies.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (3)
1. A method for suppressing relative phase noise in a coherent fiber Raman amplification system is characterized by comprising the following steps:
the first step is as follows: the method comprises the following steps that a forward Raman pump module emits forward Raman pump light, a beam splitter receives the forward Raman pump light and splits the forward Raman pump light, 99% of the forward Raman pump light is input into a transmitting end beam combiner, then the second step is carried out, 1% of the forward Raman pump light is input into a light power meter, and then the third step is carried out;
the second step is that: coupling 99% of the forward Raman pump light by using a transmitting end beam combiner, enabling the coupled forward Raman pump light to enter a transmission optical fiber, and then entering the sixth step;
the third step: the optical power meter receives 1% of the forward Raman pump light, monitors the power of the 1% of the forward Raman pump light in real time to obtain the power fluctuation of the other 99% of the forward Raman pump light, sends the monitored power to the feedback algorithm module, and then enters the fourth step;
the fourth step: the feedback algorithm module receives the power and determines the optimal value of the signal light power through a feedback algorithm, and the specific process is as follows:
(1) solving the following equation according to the parameters of the coherent optical fiber Raman amplification system, and establishing a lookup table of the pump light fluctuation and the corresponding signal light power needing to be changed;
wherein A iss(z, t) is the optical field of the signal light, αsIs a signal light attenuation coefficient, g (z) is a differential Raman gain coefficient of the signal light, β2Is the dispersion parameter, gamma, of the fiber in the vicinity of the signal lightsCoefficient of non-linearity, Ap(z, t) is the pump light field;
(2) when the optical power meter detects the fluctuation of the forward Raman pump optical power, searching the lookup table through a feedback algorithm to find a value required to be adjusted by the signal optical power, namely the optimal value of the signal optical power;
(3) the feedback algorithm module outputs the signal light power value to a signal transmitter, and then the fifth step is carried out;
the fifth step: the signal transmitter controls the signal light power unit according to the signal light power value, adjusts the fiber-entering power of the transmitted signal light, transmits the signal light to the transmitting end beam combiner, and the signal light coupled by the transmitting end beam combiner enters the transmission optical fiber and then enters the sixth step;
and a sixth step: amplifying the signal light entering the transmission optical fiber by the forward Raman pump light, and then entering a seventh step;
the seventh step: the backward Raman pump optical module at the receiving end is not required to be changed, backward Raman pump light is emitted to the transmission optical fiber by the backward Raman pump optical module, and the signal receiver receives the signal light.
2. The method for suppressing relative phase noise in a coherent fiber Raman amplification system according to claim 1, wherein the sixth step comprises the following steps:
(1) the backward Raman pumping optical module transmits backward Raman pumping light to the receiving end beam combiner;
(2) the receiving end beam combiner couples the backward Raman pump light, and the coupled backward Raman pump light enters the transmission optical fiber to amplify the signal light;
(3) the signal light reaches the signal receiver through the receiving end beam combiner, and the signal receiver restores the data on the signal light.
3. A suppression system of relative phase noise in a coherent fiber Raman amplification system is characterized by comprising a forward Raman pumping module, a beam splitter, a signal transmitter, an optical power meter, a feedback algorithm module, a transmitting end beam combiner, a transmission fiber, a backward Raman pumping optical module, a receiving end beam combiner and a signal receiver;
a signal transmitter: for transmitting an optical signal carrying transmission data;
a forward Raman pump module: for emitting forward Raman pump light;
a beam splitter: the optical fiber is used for splitting forward Raman pump light, 99% of the forward Raman pump light is used for being injected into the transmission optical fiber, and 1% of the forward Raman pump light is used for monitoring power;
an optical power meter: the system is used for receiving 1% of forward Raman pump light, monitoring the power of the 1% of forward Raman pump light in real time so as to obtain the power fluctuation of the other 99% of forward Raman pump light, and sending the monitored power to the feedback algorithm module;
a feedback algorithm module: the method is used for receiving the power monitored by the optical power meter and determining the optimal value of the signal optical power through a feedback algorithm, and comprises the following specific processes:
(1) solving the following equation according to the parameters of the coherent optical fiber Raman amplification system, and establishing a lookup table of the pump light fluctuation and the corresponding signal light power needing to be changed;
wherein A iss(z, t) is the optical field of the signal light, αsIs the light attenuation coefficient of the signal,g (z) is a differential Raman gain coefficient of the signal light, β2Is the dispersion parameter, gamma, of the fiber in the vicinity of the signal lightsCoefficient of non-linearity, Ap(z, t) is the pump light field;
(2) when the optical power meter detects the fluctuation of the forward Raman pump optical power, searching the lookup table through a feedback algorithm to find a value required to be adjusted by the signal optical power, namely the optimal value of the signal optical power;
(3) the feedback algorithm module outputs the signal light power value to a signal transmitter;
a transmitting end beam combiner: the forward Raman pump light source is used for coupling the signal light and the forward Raman pump light into a transmission optical fiber respectively;
a transmission optical fiber: for transmission of optical signals;
a receiving end beam combiner: for coupling backward Raman pump light into the transmission fiber;
backward Raman pump module: used for emitting backward Raman pump light;
the signal receiver: used for receiving optical signals and restoring transmission data.
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