CN111404612B - Optical signal amplifying device and transmission system - Google Patents
Optical signal amplifying device and transmission system Download PDFInfo
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- CN111404612B CN111404612B CN202010217118.5A CN202010217118A CN111404612B CN 111404612 B CN111404612 B CN 111404612B CN 202010217118 A CN202010217118 A CN 202010217118A CN 111404612 B CN111404612 B CN 111404612B
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
- H04B10/2525—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion using dispersion-compensating fibres
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2537—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to scattering processes, e.g. Raman or Brillouin scattering
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Abstract
The embodiment of the application discloses optical signal amplification device and transmission system, the device includes: the Raman amplification unit and the positive dispersion compensation unit are arranged between the gain unit and the Raman amplification unit; the Raman amplification unit is used for generating pump light, and the pump light is used for amplifying an input optical signal in the gain unit; and the positive dispersion compensation unit is used for carrying out positive dispersion compensation on the pump light. Therefore, the purposes of inhibiting four-wave mixing and ensuring normal amplification of optical signals are achieved. Meanwhile, the device can weaken channel crosstalk caused by four-wave mixing, enhance the performance of a system and improve the pumping utilization rate in the non-zero dispersion displacement optical fiber.
Description
Technical Field
The application relates to the technical field of optical communication, in particular to an optical signal amplifying device and a transmission system.
Background
Since the four-wave mixing will transfer part of the energy of the optical signal and generate new wavelengths, power loss to a specific channel is caused, so that the energy of the original optical signal is lost and waste of pump light is also caused. Meanwhile, if the new wavelength is the same as a certain wavelength of the original signal segment or is superposed, the problem of channel crosstalk is caused, so that the system performance is greatly reduced. In addition, the four-wave mixing signal generated by the four-wave mixing is continuously amplified as the optical signal with the increase of the transmission distance, and the four-wave mixing signal cannot be eliminated by any method.
However, the low dispersion value of the non-zero dispersion shifted fiber is not sufficient to suppress and cancel the effect of four-wave mixing caused by the increase in optical power. Therefore, in a Dense Wavelength Division Multiplexing (DWDM) system having a non-zero dispersion shifted fiber, how to suppress four-wave mixing when the pump light power is large has become a research focus.
Disclosure of Invention
The embodiment of the application provides an optical signal amplifying device and a transmission system, which can restrain a four-wave mixing effect under the condition that the power of pump light is strong enough and normally amplify an optical signal.
In order to achieve the above purpose, the technical solution of the embodiment of the present application is implemented as follows:
in a first aspect, an embodiment of the present application provides an optical signal amplifying device, where the device includes: the Raman amplification unit and the positive dispersion compensation unit are arranged between the gain unit and the Raman amplification unit;
the Raman amplification unit is used for generating pump light, and the pump light is used for amplifying an input optical signal in the gain unit;
and the positive dispersion compensation unit is used for carrying out positive dispersion compensation on the pump light.
In some embodiments, the positive dispersion compensation unit is further configured to perform positive dispersion compensation on the input optical signal.
In some embodiments, the input optical signal and the pump light are input to the gain unit through the positive dispersion compensation unit;
after the input optical signal and the pump light pass through the positive dispersion compensation unit, the input optical signal is amplified in the gain unit under the action of the pump light.
In some embodiments, the raman amplification unit comprises: a first pump source and a first wavelength division multiplexer;
the first pump source is used for generating the pump light;
the pump light and the input optical signal sequentially pass through the first wavelength division multiplexer and the positive dispersion compensation unit and then are input into the gain unit, and the pump light amplifies the input optical signal in the gain unit.
In some embodiments, the raman amplification unit further comprises: the detector comprises a first coupler, a first detector, a second coupler and a second detector;
the first coupler is used for coupling a first part of the input optical signals to the first detector and inputting a second part of the input optical signals to the first wavelength division multiplexer;
the second coupler is used for coupling a first part of the pump light to the second detector and inputting a second part of the pump light to the first wavelength division multiplexer;
and after the second part of optical signals and the second part of pump light pass through the positive dispersion compensation unit, the second part of optical signals and the second part of pump light are amplified in the gain unit under the action of the second part of pump light.
In some embodiments, the positive dispersion compensation unit is further configured to perform positive dispersion compensation on the amplified optical signal.
In some embodiments, after the pump light passes through the positive dispersion compensation unit, the input optical signal is amplified in the gain unit, and the amplified optical signal is input to the positive dispersion compensation unit.
In some embodiments, the raman amplification unit comprises: a second pump source and a second wavelength division multiplexer;
the second pumping source is used for generating the pumping light;
the pump light is sequentially input to the gain unit through the second wavelength division multiplexer and the positive dispersion compensation unit, the pump light amplifies the input optical signal in the gain unit, and the amplified optical signal is input to the second wavelength division multiplexer after passing through the positive dispersion compensation unit.
In some embodiments, the raman amplification unit further comprises: the third coupler, the fourth coupler, the fifth coupler, the third wavelength division multiplexer, the third detector, the fourth detector, the fifth detector and the sixth detector;
the third coupler is used for coupling a first part of the pump light to the third detector and inputting a second part of the pump light to the second wavelength division multiplexer;
the second part of pump light is input to the gain unit through the second wavelength division multiplexer and the positive dispersion compensation unit in sequence, the second part of pump light amplifies the input optical signal in the gain unit, and the amplified optical signal is input to the second wavelength division multiplexer after passing through the positive dispersion compensation unit;
after the amplified optical signal passes through the positive dispersion compensation unit, the amplified optical signal is transmitted to the fourth coupler through the second wavelength division multiplexer;
the fourth coupler is configured to couple a first part of the amplified optical signals to the fourth detector, and input a second part of the amplified optical signals to the third wavelength division multiplexer.
The third wavelength division multiplexer is used for separating part of the out-of-band amplified spontaneous emission ASE signals in the second part of the amplified optical signals and transmitting the part of the ASE signals to the fifth detector;
the second part of optical signals are input to the fifth coupler through the third wavelength division multiplexer, and the second part of optical signals are output through the fifth coupler;
the fifth coupler is configured to couple a portion of the output optical signal to the sixth detector.
In a second aspect, an embodiment of the present application further provides a transmission system, where the transmission system includes the optical signal amplifying device and the gain unit provided in any embodiment of the present application.
The optical signal amplifying device provided by the above embodiment, the device includes: the Raman amplification unit and the positive dispersion compensation unit are arranged between the gain unit and the Raman amplification unit; the Raman amplification unit is used for generating pump light, and the pump light is used for amplifying an input optical signal in the gain unit; and the positive dispersion compensation unit is used for carrying out positive dispersion compensation on the pump light. Therefore, the optical signal amplification device utilizes the positive dispersion compensation unit to carry out positive dispersion compensation on the pump light, and the phase difference between the pump light is increased in a dispersion increasing mode, so that the phase mismatch is realized, the four-wave mixing is restrained, and the purpose of normal amplification of the optical signal is ensured. Meanwhile, the device can weaken channel crosstalk caused by four-wave mixing, enhance the performance of a system and improve the pumping utilization rate in the non-zero dispersion displacement optical fiber.
Drawings
Fig. 1 is a schematic diagram of a transmission system according to the prior art;
fig. 2 is a schematic structural diagram of an optical signal amplifying device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of an optical signal amplifying apparatus including a forward pumping mode according to an embodiment of the present application;
fig. 4 is a schematic structural diagram illustrating a component of an electronic device including an optical signal amplifying apparatus of a forward pumping type according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical signal amplifying apparatus including a backward pumping mode according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an electronic device including an optical signal amplifying apparatus of a backward pumping type according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a transmission system according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will describe the specific technical solutions of the present application in further detail with reference to the accompanying drawings in the embodiments of the present application. The following examples are intended to illustrate the present application but are not intended to limit the scope of the present application.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Before describing in detail an optical signal amplifying apparatus provided in an embodiment of the present application, a brief description will be given of a technology related to the present application.
The raman scattering effect is a phenomenon in which the optical power inputted to the optical fiber reaches a certain value (500mV, 27dBm or more). The atoms in the crystalline lattice of the fiber are vibrated and interact with each other to produce scattering, which results in the transfer of shorter wavelength light energy to longer wavelength light.
As shown in fig. 1, a transmission system 10 includes an optical transmission device 11, an optical fiber 12, an optical signal amplification device 13, an optical fiber 14, and an optical reception device 15. Wherein, the optical transmitter 11 is used to convert the electrical signal into an optical signal and send the optical signal into the optical fiber 12. The optical signal amplifying device 13 amplifies an optical signal input from the optical fiber 12 and inputs the amplified optical signal to the optical fiber 14. And a light receiving device 15 for converting the optical signal output from the optical fiber 14 into an electrical signal. In addition, optical isolation devices can be arranged at two ends of the optical signal amplification device 13, and the optical isolation devices can prevent light reflection, ensure stable work of the system and reduce noise. An optical filter device is arranged behind the optical isolator device at the output end of the optical signal amplifier device 13. And the optical filtering device is used for filtering the noise of the optical signal amplifying device 13 and improving the signal-to-noise ratio of the system. Here, the optical signal amplifying device 13 functions as a line amplifier for amplifying an optical signal in the line.
It should be noted that the optical signal amplifying device 13 may be disposed at other positions. For example, an optical signal amplifying device may be provided between the light receiving device 15 and the optical fiber 14. The optical signal amplifying device serves as a preamplifier for amplifying the optical signal before the optical signal enters the light receiving device 15, thereby suppressing noise in the light receiving device 15.
The optical signal amplifying device may also be provided between the optical transmitting device 11 and the optical fiber 12. The optical signal amplifying device is used as a power amplifier for increasing the output power, thereby prolonging the communication distance.
DWDM systems have become one of the most efficient ways to implement very large capacity fiber optic communication systems. The fiber Raman amplifier has the advantages of amplifying any wavelength and using the fiber as a gain medium to realize low-noise power amplification. Therefore, the fiber Raman amplifier is widely applied to DWDM systems.
In addition, since the non-zero dispersion shifted fiber has a smaller dispersion and loss in the operating wavelength range around 1550nm as compared with a general single mode fiber, the non-zero dispersion shifted fiber capable of improving the system capacity and extending the transmission distance is used as a transmission medium of a DWDM system.
However, non-zero dispersion shifted fibers currently used on a large scale have a zero dispersion point around 1500nm, while in fiber raman amplifiers the pump wavelength is typically around 1400nm to 1499 nm. In DWDM systems, the phase matching condition can be met exactly if the pump light and its stimulated raman scattering noise or signal wavelength are located exactly near equidistant sidebands on both sides of the zero dispersion wavelength, and significant four-wave mixing can occur if the pump light power is sufficiently strong.
In one aspect of the embodiments of the present application, an optical signal amplifying device is provided. The optical signal amplifying device has a structure as shown in fig. 2, and the optical signal amplifying device 20 includes: a raman amplification unit 201 and a positive dispersion compensation unit 202.
A raman amplification unit 201 for generating pump light, and the pump light amplifies the input optical signal in the gain unit 21.
And a positive dispersion compensation unit 202 for performing positive dispersion compensation on the pump light.
Here, the positive dispersion compensation unit 202 is disposed between the gain unit and the raman amplification unit 201. The positive dispersion compensation unit 202 may be a length of positive dispersion compensation fiber or a chirped fiber grating. The fiber type of the positive dispersion compensation unit 202, the dispersion value of the positive dispersion compensation unit 202, and the fiber length of the positive dispersion compensation unit 202 are determined according to the operating wavelength range, the system fiber type, the system fiber parameters, the system dispersion tolerance, and the pump wavelength. In this way, the positive dispersion compensation unit 202 is integrated into the optical signal amplification device 20, so that a positive dispersion compensation technique is introduced into the optical signal amplification device 20, and the phase mismatch of the pump light is caused by increasing the dispersion, thereby achieving the effect of suppressing the four-wave mixing.
In the present embodiment, the gain unit 21 is both a raman amplification gain medium and a transmission fiber. The gain element 21 may be a non-zero dispersion shifted fiber.
In the above embodiment, the optical signal amplification apparatus performs forward dispersion compensation on the pump light by using the positive dispersion compensation unit, and increases the phase difference between the pump lights by increasing the dispersion, so that the phase mismatch is caused, thereby achieving the purposes of suppressing four-wave mixing and ensuring normal amplification of the optical signal. Meanwhile, the device can weaken channel crosstalk caused by four-wave mixing, enhance the performance of a system and improve the pumping utilization rate in the non-zero dispersion displacement optical fiber.
In some embodiments, the optical signal amplifying apparatus including the forward pumping mode is configured as shown in fig. 3, and the positive dispersion compensation unit 202 is further configured to perform forward dispersion compensation on the input optical signal.
The input optical signal and the pump light are input to the gain unit 21 through the positive dispersion compensation unit 202. After the input optical signal and the pump light pass through the positive dispersion compensation unit 202, the input optical signal is amplified in the gain unit 21 by the pump light. In this way, the optical signal amplification apparatus 20 performs forward dispersion compensation on the input optical signal and the pump light by the positive dispersion compensation unit 202. The compensated optical signal is amplified in the gain unit 21 by the compensated pump light. Meanwhile, the pump light and the input optical signal are transmitted to the gain unit 21 from the same direction, and forward pumping is implemented.
In some embodiments, the electronic device including the optical signal amplifying apparatus of the forward pumping type has a structure as shown in fig. 4, and the raman amplification unit 201 includes: a first pump source 304 and a first wavelength division multiplexer 302.
The first pump source 304 includes at least one raman pump laser for generating pump light. Here, the wavelength of the pump light generated by the raman pump laser may be in the range of 1400nm to 1499 nm. The power of the pump light may be determined according to the insertion loss of the positive dispersion compensation unit 202, the insertion loss of the gain unit 21, the desired gain, and the operating wavelength range.
A first wavelength division multiplexer 302 for combining the pump light and the input optical signal and inputting the combined signal to the positive dispersion compensation unit 202.
The pump light and the input optical signal sequentially pass through the first wavelength division multiplexer 302 and the positive dispersion compensation unit 202 and then are input to the gain unit 21, and the pump light amplifies the optical signal in the gain unit 21.
Here, the optical signal amplifying device 20 generates pump light using the first pump source 304. The pump light and the input optical signal pass through the first wavelength division multiplexer 302 and then are input to the positive dispersion compensation unit 202. The pump light and the input optical signal pass through the positive dispersion compensation unit 202 and are input to the gain unit 21. The pump light amplifies an input optical signal in the gain unit 21. Wherein, the pump light is input from the pump input terminal of the first wavelength division multiplexer 302, and the input optical signal is input from the signal input terminal of the first wavelength division multiplexer 302. The pump light and the input optical signal are output from the common terminal of the first wavelength division multiplexer 302.
In some embodiments, referring to fig. 4, the raman amplification unit 201 further includes: a first coupler 301, a first detector 303, a second coupler 305 and a second detector 306.
The first coupler 301 is configured to couple a first portion of the input optical signals to the first detector 303, and input a second portion of the input optical signals to the first wavelength division multiplexer 302.
The first detector 303 may be a photodetector for detecting the power of an incoming optical signal.
A second coupler 305 for coupling a first part of the pump light to the second detector 306 and for inputting a second part of the pump light to the first wavelength division multiplexer 302.
The second detector 306 may be a photodetector for detecting the power of the pump light generated by the first pump source 304.
The second part of optical signals and the second part of pump light are input to the positive dispersion compensation unit 202 after passing through the first wavelength division multiplexer 302, and after the second part of optical signals and the second part of pump light pass through the positive dispersion compensation unit 202, the second part of optical signals are amplified in the gain unit 21 under the action of the second part of pump light. In this way, the optical signal amplification apparatus 20 combines the second partial optical signal and the second partial pump light by the first wavelength division multiplexer 302, and inputs the combined signal to the positive dispersion compensation unit 202. The optical signal amplification apparatus 20 performs forward dispersion compensation on the second optical signal and the second pump light by using the positive dispersion compensation unit 202. The compensated optical signal is amplified in the gain unit 21 by the compensated pump light.
Here, the optical signal amplifying apparatus 20 separates the input optical signal into the first partial optical signal and the second partial optical signal by the first coupler 301. The optical signal amplifying device 20 couples the first partial optical signal to the first detector 303 using the first coupler 301, and inputs the second partial optical signal to the first wavelength division multiplexer 302. The optical signal amplifying device 20 separates the pump light generated by the first pump source 304 into a first portion of pump light and a second portion of pump light using the second coupler 305. The optical signal amplifying device 20 couples the first part of the pump light to the second detector 306 using the second coupler 305, and inputs the second part of the pump light to the first wavelength division multiplexer 302.
The second portion of the optical signal is input from the signal input of the first wavelength division multiplexer 302 and the second portion of the pump light is input from the pump input of the first wavelength division multiplexer 302. After the second part of optical signals and the second part of pump light are combined by the first wavelength division multiplexer 302, the second part of optical signals and the second part of pump light are output to the positive dispersion compensation unit 202 from a common end of the first wavelength division multiplexer 302. After the second portion of optical signals and the second portion of pump light pass through the positive dispersion compensation unit 202, the second portion of optical signals are amplified in the gain unit 21 under the action of the second portion of pump light.
Here, the optical signal amplification apparatus 20 combines the second partial optical signal and the second partial pump light by the first wavelength division multiplexer 302, and inputs the combined signal to the positive dispersion compensation unit 202. The optical signal amplification apparatus 20 performs forward dispersion compensation on the second optical signal and the second pump light by using the positive dispersion compensation unit 202. The compensated optical signal is amplified in the gain unit 21 by the compensated pump light.
In some embodiments, referring to fig. 4, the optical signal output by the optical source is separated into a first partial optical signal and a second partial optical signal after passing through the first coupler 301. Wherein the first portion of the optical signal is coupled to the first detector 303. The second portion of the optical signal is input to the first wavelength division multiplexer 302.
The pump light generated by the first pump source 304 is separated into a first portion of pump light and a second portion of pump light by passing through the second coupler 305. Wherein a first portion of the pump light is coupled to the second detector 306. The second part of the pump light is input to the first wavelength division multiplexer 302.
The second portion of the optical signal is input from the signal input of the first wavelength division multiplexer 302 and the second portion of the pump light is input from the pump input of the first wavelength division multiplexer 302. The second part of optical signals and the second part of pump light are combined by the first wavelength division multiplexer 302 and then output to the positive dispersion compensation unit 202 from the common end of the first wavelength division multiplexer 302, and the second part of optical signals and the second part of pump light are respectively subjected to forward dispersion compensation in the positive dispersion compensation unit 202. The compensated second part of the optical signal and the compensated second part of the pump light are input to the gain unit 21. The compensated second part of the optical signal is amplified in the gain unit 21 by the compensated second part of the pump light. The amplified second portion of the optical signal is output from the output of the gain cell.
In some embodiments, referring to fig. 4, the optical signal amplifying device 20 further includes: a central control unit 203. The central control unit 203 is connected to a first detector 303.
And the central control unit 203 is used for receiving the detection result sent by the first detector 303 and sending the detection result to the display device. So that the power of the incoming optical signal can be presented to the user by means of the first detector 303 and the central control unit 203.
The central control unit 203 is also connected to a second detector 306. The central control unit 203 is further configured to receive the detection result sent by the second detector 306, and adjust the first pump source 304 according to the detection result. So that a desired pump light power can be generated using the second detector 306 and the central control unit 203.
In some embodiments, the optical signal amplifying apparatus including the backward pumping mode is configured as shown in fig. 5, and the positive dispersion compensation unit 202 is further configured to perform a positive dispersion compensation on the amplified optical signal. Here, after the pump light passes through the positive dispersion compensation section 202, the input optical signal is amplified in the gain section 21, and the amplified optical signal is input to the positive dispersion compensation section 202. In this way, the optical signal amplification apparatus 20 performs forward dispersion compensation on the pump light by the positive dispersion compensation unit 202. The compensated pump light amplifies the input optical signal in the gain unit 21. The optical signal amplification apparatus 20 performs forward dispersion compensation on the amplified optical signal by the positive dispersion compensation unit 202. Meanwhile, the pump light and the input optical signal are transmitted to the gain unit 21 from different directions, thereby realizing backward pumping.
In some embodiments, the electronic circuit including the optical signal amplifying apparatus of the backward pumping type has a structure as shown in fig. 6, and the raman amplification unit 201 includes: a second pump source 401 and a second wavelength division multiplexer 402.
The second pump source 401 includes at least one raman pump laser for generating pump light. Here, the wavelength of the pump light generated by the raman pump laser may be in the range of 1400nm to 1499 nm. The power of the pump light may be determined according to the insertion loss of the positive dispersion compensation unit 202, the insertion loss of the gain unit 21, the desired gain, and the operating wavelength range.
And a second wavelength division multiplexer 402 for inputting the pump light from the pump input terminal and outputting the pump light from the common terminal. It is also used for inputting optical signals from the public end and outputting the optical signals from the signal output end.
The pump light sequentially passes through the second wavelength division multiplexer 402 and the positive dispersion compensation unit 202 and is input to the gain unit 21, the pump light amplifies the input optical signal in the gain unit 21, and the amplified optical signal passes through the positive dispersion compensation unit 202 and is input to the second wavelength division multiplexer 402.
Here, the optical signal amplifying device 20 uses the pump light generated by the second pump source 401. The optical signal amplification apparatus 20 inputs the pump light to the positive dispersion compensation unit 202 by using the second wavelength division multiplexer 402. The optical signal amplification apparatus 20 performs forward dispersion compensation on the pump light by using the positive dispersion compensation unit 202. The compensated pump light amplifies the input optical signal in the gain unit 21. The optical signal amplification apparatus 20 performs forward dispersion compensation on the amplified optical signal by the positive dispersion compensation unit 202, and inputs the compensated optical signal to the second wavelength division multiplexer 402.
Wherein the pump light is input from a pump input terminal of the second wavelength division multiplexer 402 and output from a common terminal of the second wavelength division multiplexer 402. The compensated optical signal is input from the common terminal of the second wavelength division multiplexer 402 and output from the signal output terminal of the second wavelength division multiplexer 402.
In some embodiments, referring to fig. 6, the raman amplification unit 201 further includes: a third coupler 403, a fourth coupler 405, a fifth coupler 406, a third wavelength division multiplexer 407, a third detector 404, a fourth detector 408, a fifth detector 409 and a sixth detector 410.
The amplified optical signal passes through the positive dispersion compensation unit 202, and then is transmitted to the fourth coupler 405 through the second wavelength division multiplexer 402.
A third coupler 403 for coupling a first part of the pump light to the third detector 404 and for inputting a second part of the pump light to the second wavelength division multiplexer 402.
Here, the optical signal amplifying apparatus 20 separates the pump optical signal generated by the second pump source 401 into the first partial pump optical signal and the second partial pump optical signal using the third coupler 403. The optical signal amplifying device 20 couples the first part of the pump optical signal to the third detector 404 by using the third coupler 403, and inputs the second part of the pump optical signal to the pump input terminal of the second wavelength division multiplexer 402. The second partial pump optical signal is output from the common terminal of the second wavelength division multiplexer 402 to the positive dispersion compensation unit 202.
The third detector 404 may be a photodetector for detecting the power of the pump light generated by the second pump source 401.
A fourth coupler 405, configured to couple a first part of the amplified optical signals to the fourth detector 408, and input a second part of the amplified optical signals to the third wavelength division multiplexer 407. Here, the input optical signal is amplified in the gain unit 21 by the second part of the pump light. The optical signal amplification device 20 performs forward dispersion compensation on the amplified optical signal by the positive dispersion compensation unit 202. The optical signal amplifying apparatus 20 transmits the compensated amplified optical signal to the fourth coupler 405 using the second wavelength division multiplexer 402. The optical signal amplifying apparatus 20 separates the compensated amplified optical signal into a first partial optical signal and a second partial optical signal by using the fourth coupler 405, couples the first partial optical signal to the fourth detector 408, and inputs the second partial optical signal to the third wavelength division multiplexer 407.
Wherein the compensated amplified optical signal is input from the common terminal of the second wavelength division multiplexer 402 and output from the signal output terminal of the second wavelength division multiplexer 402.
The fourth detector 408 may be a photodetector for detecting the power of the compensated amplified optical signal.
A third wavelength division multiplexer 407, configured to separate an Amplified Spontaneous Emission (ASE) signal outside a bandwidth of a portion of the second portion of the Amplified optical signal, and transmit a portion of the out-of-band ASE signal to the fifth detector 409.
The fifth detector 409 may be a photo detector for detecting the power of the out-of-band ASE signal.
The second part of the optical signal is input to the fifth coupler 406 through the third wavelength division multiplexer 407, and the second part of the optical signal is output through the fifth coupler 406.
Here, the optical signal amplifying device 20 separates the out-of-band ASE signal in the second part of the optical signal by the third wavelength division multiplexer 407, and inputs the out-of-band ASE signal to the fifth detector 409 and the second part of the optical signal to the fifth coupler 406.
A fifth coupler 406 for coupling a portion of the output optical signal to a sixth detector 410.
The sixth detector 410 may be a photodetector for detecting the power of the output optical signal.
In some embodiments, referring to fig. 6, the pump light generated by the second pump source 401 passes through the third coupler 403 and is separated into a first portion of pump light and a second portion of pump light. The first portion of the pump light is coupled to a third detector 404. The second part of the pump light is input to the second wavelength division multiplexer 402. The second part of the pump light passes through the second wavelength division multiplexer 402 and is input to the positive dispersion compensation unit 202. The second part of the pump light is subjected to forward dispersion compensation in the positive dispersion compensation unit 202. The compensated second portion of the pump light is input to the gain unit 21. Wherein the second part of the pump optical signal is input from the pump input terminal of the second wavelength division multiplexer 402. The second part of the pump optical signal is output from the common terminal of the second wavelength division multiplexer 402.
The optical signal output by the light source enters the gain unit 21. The optical signal output by the light source is amplified in the gain unit 21 under the action of the compensated second part of the pump light. The amplified optical signal passes through the gain section 21 and is input to the positive dispersion compensation section 202. The amplified optical signal is subjected to forward dispersion compensation in the positive dispersion compensation unit 202. The compensated amplified optical signal is input to the second wavelength division multiplexer 402. The compensated amplified optical signal passes through the second wavelength division multiplexer 402 and is input to the fourth coupler 405. Wherein the compensated amplified optical signal is input from the common terminal of the second wavelength division multiplexer 402 and from the signal output terminal of the second wavelength division multiplexer 402.
The compensated amplified optical signal is split into a first partial optical signal and a second partial optical signal by a fourth coupler 405. The first portion of the optical signal is coupled to a fourth detector 408. The second part of the optical signal is input to the third wavelength division multiplexer 407. The second part of the optical signal passes through a third wavelength division multiplexer 407, and an out-of-band ASE signal in the second part of the optical signal is separated. The out-of-band ASE signal is input to the fifth detector 409 through the third wavelength division multiplexer 407. The second partial optical signal passes through the third wavelength division multiplexer 407 and is input to the fifth coupler 406. The second portion of the optical signal is split into two portions of the optical signal by the fifth coupler 406. A part of the optical signal is input from one end of the fifth coupler to the sixth detector 410. The other part of the optical signal is output from the other end of the fifth coupler.
In some embodiments, referring to fig. 6, the optical signal amplifying device 20 further includes a central control unit 203.
The central control unit 203 is configured to adjust a gain control parameter of the optical signal amplifying device 20 according to the first power value measured by the fourth detector 408 and the second power value measured by the sixth detector 410.
In some embodiments, the central control unit 203 is configured to adjust a gain control parameter of the apparatus according to the third power value measured by the fifth detector 409.
In some embodiments, the central control unit 203 is configured to adjust the gain control parameter of the optical signal amplifying device 20 according to the first power value measured by the fourth detector 408, the second power value measured by the sixth detector 410, and the third power value measured by the fifth detector 409.
In some embodiments, the central control unit 203 is also connected to a third detector 404. And the central control unit 203 is configured to receive the detection result sent by the third detector 404, and adjust the second pump source 401 according to the detection result. So that a desired pump light can be generated using the third detector 404 and the central control unit 203.
In another aspect of the embodiments of the present application, a transmission system is further provided. The composition structure of the transmission system is shown in fig. 7, and the transmission system 50 includes the optical signal amplifying device 20 and the gain unit 21 provided in any embodiment of the present application.
In some embodiments, the transmission system may include the optical signal amplification device including the forward pumping scheme provided in any embodiment of the present application and the optical signal amplification device including the backward pumping scheme provided in any embodiment of the present application.
It should be noted that, in the transmission system in the embodiment of the present application, multiple optical signal amplification devices may be used to perform multistage amplification, so that the optical signal will implement distributed raman amplification along the optical fiber.
It will be understood by those of ordinary skill in the art that all or some of the steps of the methods, systems, functional modules/units in the devices disclosed above may be implemented as software, firmware, hardware, and suitable combinations thereof. In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be performed by several physical components in cooperation. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. The protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. An optical signal amplification device, the device comprising: the Raman amplification unit and the positive dispersion compensation unit are arranged between the gain unit and the Raman amplification unit;
the Raman amplification unit is used for generating pump light, and the pump light is used for amplifying an input optical signal in the gain unit;
the positive dispersion compensation unit is used for carrying out positive dispersion compensation on the pump light;
the input optical signal and the pumping light are input to the gain unit through the positive dispersion compensation unit;
after the input optical signal and the pump light pass through the positive dispersion compensation unit, the input optical signal is amplified in the gain unit under the action of the pump light.
2. The apparatus of claim 1, wherein the positive dispersion compensation unit is further configured to perform positive dispersion compensation on the input optical signal.
3. The apparatus of claim 1, wherein the raman amplification unit comprises: a first pump source and a first wavelength division multiplexer;
the first pump source is used for generating the pump light;
the pump light and the input optical signal sequentially pass through the first wavelength division multiplexer and the positive dispersion compensation unit and then are input into the gain unit, and the pump light amplifies the input optical signal in the gain unit.
4. The apparatus of claim 3, wherein the Raman amplification unit further comprises: the detector comprises a first coupler, a first detector, a second coupler and a second detector;
the first coupler is used for coupling a first part of the input optical signals to the first detector and inputting a second part of the input optical signals to the first wavelength division multiplexer;
the second coupler is used for coupling a first part of the pump light to the second detector and inputting a second part of the pump light to the first wavelength division multiplexer;
and after the second part of optical signals and the second part of pump light pass through the positive dispersion compensation unit, the second part of optical signals and the second part of pump light are amplified in the gain unit under the action of the second part of pump light.
5. The apparatus of claim 1, wherein the positive dispersion compensation unit is further configured to perform positive dispersion compensation on the amplified optical signal.
6. The apparatus according to claim 5, wherein the pump light passes through the positive dispersion compensation unit, the input optical signal is amplified in the gain unit, and the amplified optical signal is input to the positive dispersion compensation unit.
7. The apparatus of claim 6, wherein the Raman amplification unit comprises: a second pump source and a second wavelength division multiplexer;
the second pumping source is used for generating the pumping light;
the pump light is sequentially input to the gain unit through the second wavelength division multiplexer and the positive dispersion compensation unit, the pump light amplifies the input optical signal in the gain unit, and the amplified optical signal is input to the second wavelength division multiplexer after passing through the positive dispersion compensation unit.
8. The apparatus of claim 7, wherein the Raman amplification unit further comprises: the third coupler, the fourth coupler, the fifth coupler, the third wavelength division multiplexer, the third detector, the fourth detector, the fifth detector and the sixth detector;
the third coupler is used for coupling a first part of the pump light to the third detector and inputting a second part of the pump light to the second wavelength division multiplexer;
the second part of pump light is input to the gain unit through the second wavelength division multiplexer and the positive dispersion compensation unit in sequence, the second part of pump light amplifies the input optical signal in the gain unit, and the amplified optical signal is input to the second wavelength division multiplexer after passing through the positive dispersion compensation unit;
after the amplified optical signal passes through the positive dispersion compensation unit, the amplified optical signal is transmitted to the fourth coupler through the second wavelength division multiplexer;
the fourth coupler is configured to couple a first part of the amplified optical signals to the fourth detector, and input a second part of the amplified optical signals to the third wavelength division multiplexer;
the third wavelength division multiplexer is used for separating part of out-of-band amplified spontaneous emission ASE signals in the second part of the amplified optical signals and transmitting the part of out-of-band ASE signals to the fifth detector;
the second part of optical signals are input to the fifth coupler through the third wavelength division multiplexer, and the second part of optical signals are output through the fifth coupler;
the fifth coupler is configured to couple a portion of the output optical signal to the sixth detector.
9. A transmission system comprising an optical signal amplification device according to any one of claims 1 to 8 and a gain unit.
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