CN117080847A - Optical amplifier, optical amplifying method and optical fiber communication system - Google Patents

Optical amplifier, optical amplifying method and optical fiber communication system Download PDF

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Publication number
CN117080847A
CN117080847A CN202210507453.8A CN202210507453A CN117080847A CN 117080847 A CN117080847 A CN 117080847A CN 202210507453 A CN202210507453 A CN 202210507453A CN 117080847 A CN117080847 A CN 117080847A
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China
Prior art keywords
pump light
fiber
optical fiber
doped
light
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CN202210507453.8A
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Chinese (zh)
Inventor
何涛
姜恒云
邓宁
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Chengdu Huawei Technology Co Ltd
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Chengdu Huawei Technology Co Ltd
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Priority to CN202210507453.8A priority Critical patent/CN117080847A/en
Priority to PCT/CN2023/092966 priority patent/WO2023217131A1/en
Publication of CN117080847A publication Critical patent/CN117080847A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
    • H01S3/06—Construction or shape of active medium
    • H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
    • H01S3/067—Fibre lasers
    • H01S3/06754—Fibre amplifiers
    • H01S3/06758—Tandem amplifiers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
    • H01S3/09—Processes or apparatus for excitation, e.g. pumping
    • H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
    • H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
    • 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
    • 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
    • H04B10/29—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
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • 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
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J14/00—Optical multiplex systems
    • H04J14/02—Wavelength-division multiplex systems
    • H04J14/0201—Add-and-drop multiplexing
    • H04J14/0202—Arrangements therefor

Abstract

The application provides an optical amplifier, an optical amplifying method and an optical fiber communication system, and belongs to the technical field of optical fiber communication. The optical amplifier includes a first pump module, a first wavelength division multiplexer, and a doped optical fiber. The first pump module is used for outputting Raman pump light. The first wavelength division multiplexer is used for coupling Raman pump light to a doped optical fiber, the doped optical fiber is used for absorbing the Raman pump light, amplifying and outputting signal light input into the optical amplifier, outputting residual pump light in the Raman pump light to a link optical fiber connected with the optical amplifier, and the residual pump light is used as pump light in the link optical fiber. By adopting the scheme of the application, the doped optical fiber and the link optical fiber share the Raman pump light, so that the utilization rate of the pump light can be improved.

Description

Optical amplifier, optical amplifying method and optical fiber communication system
Technical Field
The present application relates to the field of optical fiber communications technologies, and in particular, to an optical amplifier, an optical amplifying method, and an optical fiber communication system.
Background
The optical fiber communication system has the advantages of wide bandwidth, high capacity, low delay and the like, and is widely used for transmitting a large amount of data. With increasing transmission rate, the optical signal-to-noise ratio (optical signal to noise ratio, OSNR) of the optical fiber communication system decreases, and an optical amplifier is also commonly used in the optical fiber communication system to compensate for the optical fiber loss, and the optical amplifier amplifies a signal and brings about a certain noise, and the noise also directly degrades the optical signal-to-noise ratio of the signal. Therefore, the optical amplifier needs to be developed toward a wide bandwidth, low noise, and strong usability.
Currently, doped fiber amplifiers are commonly used as optical amplifiers in fiber optic communication systems. For example, the optical amplifier is an erbium-doped fiber amplifier (Er-doped fiber amplifier, EDFA). Doped fiber amplifiers are usually realized with a high inversion ratio, which requires high power pump light, in order to make the noise relatively small. However, the high-power pump light input doped fiber amplifier has residual pump light, and the residual pump light can be dissipated in the form of heat, so that the utilization rate of the pump light of the optical amplifier is lower.
Disclosure of Invention
The application provides an optical amplifier, an optical amplifying method and an optical fiber communication system, which can improve the utilization rate of pump light.
In a first aspect, the present application provides an optical amplifier comprising a first pump module, a first wavelength division multiplexer (wavelength division multiplexing, WDM) and a doped optical fiber; the first pumping module is used for outputting Raman pump light; the first wavelength division multiplexer is used for coupling the Raman pump light to the doped optical fiber; the doped optical fiber is used for absorbing the Raman pump light, amplifying and outputting the signal light input into the optical amplifier, and outputting the residual pump light in the Raman pump light to the link optical fiber connected with the optical amplifier, wherein the residual pump light is used as the pump light in the link optical fiber.
In the scheme shown in the application, the pumping light used by the optical amplifier is Raman pumping light, the first wavelength division multiplexer couples the Raman pumping light into the doped optical fiber of the optical amplifier, the doped optical fiber absorbs the Raman pumping light, amplifies and outputs the signal light input into the optical amplifier, and outputs the rest pumping light in the Raman pumping light to the link optical fiber connected with the optical amplifier. The link fiber raman amplifies the signal light inputted into the link fiber by using the remaining pump light. By adopting the scheme of the application, the doped optical fiber and the link optical fiber share the Raman pump light, and the link optical fiber is longer on the premise of ensuring the high inversion rate of the doped optical fiber, so that the residual pump light can be absorbed, and the utilization rate of the pump light can be improved. And the Raman pump light is firstly input into the doped optical fiber and is partially absorbed, the power of the residual pump light is reduced compared with the power of the Raman pump light, the power of the residual pump light entering the link optical fiber is reduced to an acceptable range, and the problem that the power of the pump light entering the link optical fiber is too high when the link optical fiber performs Raman amplification on the signal light can be solved, so that pumping protection measures are not needed.
In one example, the direction of transmission of the signal light is opposite to the direction of transmission of the raman pump light transmitted in the doped fiber; the transmission direction of the signal light is opposite to the transmission direction of the rest of the pump light in the link fiber.
In the scheme shown in the application, the transmission direction of the signal light is opposite to the transmission direction of the pump light, so that the reverse pumping of the link optical fiber and the optical amplifier can be realized, and the nonlinear cost of the link optical fiber is lower.
In one example, the transmission direction of the signal light is the same as the transmission direction of the raman pump light transmitted in the doped fiber; the transmission direction of the signal light is the same as the transmission direction of the remaining pump light in the link fiber.
In the scheme shown in the application, the transmission direction of the signal light is the same as the transmission direction of the pump light, so that the co-pumping of the link optical fiber and the optical amplifier can be realized.
In one example, the doped fiber is fused to the link fiber or connected by a fiber connector. In this way, a variety of ways of connecting the doped fiber to the link fiber are provided.
In one example, the first pump module includes a plurality of pump units and a beam combining unit; the multiple pump units are used for outputting multiple pump lights with different wavelengths; the beam combining unit is used for combining the pump light with the different wavelengths into one beam of Raman pump light.
In the scheme shown in the application, the Raman pump light can be obtained by a plurality of pump light beams with different wavelengths.
In one example, the wavelength of the raman pump light ranges from 1400nm to 1520nm.
In one example, the optical amplifier further comprises N doped fiber amplification modules, N being an integer greater than or equal to 1; the 1 st to the N doped fiber amplification modules are sequentially arranged along the transmission direction of the signal light; the first wavelength division multiplexer is positioned between the N doped optical fiber amplifying modules and the doped optical fibers.
In the scheme shown in the application, the optical amplifier can be a multi-stage amplifier, so that the gain of the signal light after passing through the optical amplifier can meet the requirement.
In one example, the optical amplifier further comprises a second pump module and a second wavelength division multiplexer; the second pump module is used for outputting first pump light; the second wavelength division multiplexer is used for coupling the first pumping light to the doped optical fiber; the doped optical fiber is used for absorbing the Raman pump light and the first pump light, amplifying and outputting the signal light, and the transmission direction of the first pump light is opposite to that of the Raman pump light.
In the scheme shown in the application, the optical amplifier adopts a bidirectional pumping mode, so that the gain of the signal light after passing through the optical amplifier can meet the requirement.
In one example, the optical amplifier further comprises an isolation module; the isolation module is used for preventing light transmitted in the direction opposite to the transmission direction of the signal light from passing through.
Thus, the isolation module prevents light transmitted in the reverse direction of the signal light transmission direction from passing through, so that the light transmitted in the reverse direction of the signal light does not influence the optical amplifier.
In a second aspect, the present application provides a method of optical amplification, the method being applied to the optical amplifier of the first aspect or any one of the first aspects, the optical amplifier comprising a first pump module, a first wavelength division multiplexer and a doped optical fiber, the method comprising: the first pump module outputs Raman pump light to the first wavelength division multiplexer; the first wavelength division multiplexer couples the raman pump light to the doped fiber; the doped optical fiber absorbs the raman pump light, amplifies and outputs the signal light input to the optical amplifier, and outputs the remaining pump light in the raman pump light to the link optical fiber connected with the optical amplifier, wherein the remaining pump light is used as the pump light in the link optical fiber.
In the scheme shown in the application, the doped optical fiber and the link optical fiber share the Raman pump light, and on the premise of ensuring the high inversion rate of the doped optical fiber, the link optical fiber is longer and can absorb the residual pump light, so that the utilization rate of the pump light can be improved. And the Raman pump light is firstly input into the doped optical fiber and is partially absorbed, the power of the residual pump light is reduced compared with the power of the Raman pump light, the power of the residual pump light entering the link optical fiber is reduced to an acceptable range, and the problem that the power of the pump light entering the link optical fiber is too high when the link optical fiber performs Raman amplification on the signal light can be solved, so that pumping protection measures are not needed.
In one example, the direction of transmission of the signal light is opposite to the direction of transmission of the raman pump light transmitted in the doped fiber; the transmission direction of the signal light is opposite to the transmission direction of the rest of the pump light in the link fiber.
In the scheme shown in the application, the transmission direction of the signal light is opposite to the transmission direction of the pump light, so that the reverse pumping of the link optical fiber and the optical amplifier can be realized, and the nonlinear cost of the link optical fiber is lower.
In a third aspect, the present application provides an optical fiber communication system, the optical fiber communication system comprising a first network element, a second network element and at least one optical amplifier according to the first aspect or any one of the first aspects; the optical amplifier is located between the first network element and the second network element.
Drawings
Fig. 1 is a schematic diagram of a conventional optical amplifier;
fig. 2 is a schematic diagram of another conventional optical amplifier;
FIG. 3 is a schematic diagram of an optical fiber communication system according to an exemplary embodiment of the present application;
fig. 4 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 5 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 6 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 7 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 8 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 9 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 10 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 11 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 12 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 13 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 14 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 15 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 16 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 17 is a schematic diagram of an optical amplifier according to an exemplary embodiment of the present application;
fig. 18 is a schematic diagram showing performance simulation and actual measurement results of an optical amplifier according to an exemplary embodiment of the present application.
Description of the drawings
1. A first pump module; 2. a first wavelength division multiplexer; 3. doping the optical fiber; 01. a link optical fiber;
4. a doped fiber amplification module; 5. a second pump module; 6. a second wavelength division multiplexer;
7. an isolation module; 8. a gain flattening filter module; 9. a variable optical attenuator (variable optical attenuator, VOA);
11. a pumping unit; 12. and a beam combining unit.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the embodiments of the present application will be described in further detail with reference to the accompanying drawings.
Some term concepts related to the embodiments of the present application are explained below.
1. The raman effect refers to the scattering of light through an optical fiber medium due to frequency changes caused by interaction of incident light with molecular motion. The raman effect is also known as raman scattering.
2. A distributed raman optical amplifier (disturbed Raman amplifier, DRA) is an optical amplifier that uses a link fiber, which may also be referred to as a transmission fiber, as a raman gain medium in long distance transmission. When the pump light of the DRA is obtained by the light beams with different wavelengths, the amplification of the broad-spectrum signal light can be realized.
3. Erbium-doped fiber amplifiers (Er-doped fiber amplifier, EDFA) in which erbium ions are doped in the core through which signal light passes.
The background of the application is described below.
The optical fiber communication system has the advantages of large bandwidth, high capacity, low delay and the like, and is widely applied to the transmission of mass data. As the transmission rate increases, the OSNR of the optical fiber communication system decreases, and an optical amplifier is generally used in the optical fiber communication system to compensate for the optical fiber loss, and the optical amplifier amplifies a signal while bringing about a certain noise, which directly degrades the OSNR of the signal. Therefore, the optical amplifier needs to be developed toward a wide bandwidth, low noise, and strong usability.
Currently, doped fiber amplifiers are commonly used as optical amplifiers in fiber optic communication systems. For example, referring to fig. 1, the optical amplifier is an EDFA, and two cascaded EDFAs are shown, namely EDFA1 and EDFA2. Doped fiber amplifiers are usually realized with a high inversion ratio, which requires high power pump light, in order to make the noise relatively small. However, the high-power pump light input doped fiber amplifier has residual pump light, and the residual pump light can be dissipated in the form of heat, so that the utilization rate of the pump light of the optical amplifier is lower.
In another optical amplifier, DRA and EDFA are mated as a line-side optical amplifier, which is named raman amplification unit (Raman amplifier unit, RAU), the structure of which is shown in fig. 2. In fig. 2, the DRA cascades the EDFA, and the raman pump light is input into the link optical fiber through the wavelength division multiplexer, so as to amplify the signal light, and in the optical amplifier shown in fig. 2, the power of the raman pump light is relatively high, so that the DRA has security risks such as fiber burning and eye security in application, and therefore, a series of measures need to be taken in the aspect of security. For example, an interlock switch at the physical level enables the fiber to shut down the safety protection of the raman pump source. An optical time-domain reflectometer (OTDR) is integrated in the optical amplifier to detect fiber breakage or fiber end surface dirt so as to realize quick closing of the Raman pump source, and the safety measures can play a role in pump safety protection, but do not fundamentally reduce the power of pump light entering the line fiber, and still cause risks of disconnection of the link fiber and the like.
The reason why the raman pump light power is high and the fiber is burned here is that: the connection between the optical amplifier and the link optical fiber is often contaminated, especially some organic substances are adsorbed at the connection, so that high-power raman pump light generates heat at the connection, and the optical fiber is burned out.
Based on the above, the application provides an optical amplifier, wherein raman pump light is firstly input into a doped optical fiber, and after part of the raman pump light is absorbed by the doped optical fiber, the rest pump light is input into a link optical fiber to be used as pump light in the link optical fiber. Therefore, the doped optical fiber and the link optical fiber share the Raman pump light, and the link optical fiber is longer, so that the rest pump light can be fully absorbed, and the utilization rate of the pump light is higher. And because the Raman pump light is firstly absorbed by a part of the doped optical fiber, the power of the pump light entering the link optical fiber can be reduced, and the related pump safety protection during Raman amplification is omitted.
The following describes an application scenario of the optical amplifier in the embodiment of the present application.
The optical amplifier in the embodiment of the application can be applied to an optical fiber communication system. Referring to fig. 3, the optical fiber communication system comprises a first network element 101, a second network element 102 and at least one optical amplifier. The first network element 101 may be a transmitting device in a fiber optic communication system and the second network element 102 may be a receiving device in a fiber optic communication system. Alternatively, the first network element 101 may be any two devices between a transmitting device and a receiving device in a fiber optic communication system.
In one example, the optical amplifier may be implemented as a repeater amplifier of a fiber optic communication system, the repeater amplifier being located intermediate the first network element 101 and the second network element 102.
In another example, the optical amplifier may be used as a pre-amplifier of the optical fiber communication system, where the pre-amplifier is located before the second network element 102, and amplifies the signal light entering the second network element 102.
In another example, the optical amplifier may be used as a post-amplifier of the optical fiber communication system, where the post-amplifier is located after the first network element 101, and amplifies the signal light output by the first network element 101.
The structure of the optical amplifier in the embodiment of the present application is described below.
The optical amplifier comprises a first pump module 1, a first wavelength division multiplexer 2 and a doped optical fiber 3. The first pump module 1 is a light source providing raman pump light. The first pump module 1 is connected with the first wavelength division multiplexer 2, the first wavelength division multiplexer 2 is connected with the doped optical fiber 3, and the doped optical fiber 3 is connected with the link optical fiber 01. The link fiber 01 is a line-side fiber.
The first pump module 1 outputs raman pump light. The first wavelength division multiplexer 2 couples raman pump light to the doped fiber 3. The doped fiber 3 absorbs the raman pump light, amplifies the signal light inputted to the optical amplifier, and outputs the amplified signal light. The raman pump light will have residual pump light after passing through the doped fiber 3. The doped fiber 3 also outputs the remaining pump light of the raman pump light to the link fiber 01. The link fiber 01 absorbs the remaining pump light and raman amplifies the signal light.
Thus, the doped fiber 3 and the link fiber 01 share raman pump light, and the pump light utilization ratio can be made relatively high.
The link fiber 01 is far longer than the doped fiber 3, and can sufficiently absorb the remaining pump light.
In one example, the optical amplifier employs a reverse pumping mode and the link fiber 01 also employs a reverse pumping mode. The reverse pumping mode refers to a pumping mode in which the transmission direction of the signal light is opposite to that of the pump light. Fig. 4 exemplarily provides a schematic structural diagram of the optical amplifier. Referring to fig. 4, the optical amplifier includes a first pump module 1, a first wavelength division multiplexer 2, and a doped optical fiber 3. The first pump module 1 is a light source providing raman pump light. The first wavelength division multiplexer 2 is a three-port device, the first pump module 1 is connected to a first port of the first wavelength division multiplexer 2, a second port of the first wavelength division multiplexer 2 is connected to the doped optical fiber 3, and a third port of the first wavelength division multiplexer 2 can be used as an output port of the optical amplifier. The doped fiber 3 is connected to the link fiber 01, and the link fiber 01 is connected to the signal light input end of the doped fiber 3.
In the optical amplifier shown in fig. 4, the signal light sequentially passes through the link optical fiber 01, the doped optical fiber 3, and the first wavelength division multiplexer 2. After being output from the first pump module 1, the raman pump light sequentially passes through the first wavelength division multiplexer 2, the doped optical fiber 3 and the link optical fiber 01. Specifically, the first pump module 1 outputs raman pump light. The first wavelength division multiplexer 2 couples raman pump light to the doped fiber 3. The doped fiber 3 absorbs the raman pump light, amplifies the signal light inputted into the doped fiber 3, and outputs the amplified signal light. The signal light inputted to the doped fiber 3 is the signal light outputted from the link fiber 01. The doped fiber 3 also outputs the remaining pump light of the raman pump light to the link fiber 01. The link optical fiber 01 is relatively long, and can fully absorb the residual pump light, raman amplify the signal light input into the link optical fiber 01, and output the raman amplified signal light to the doped optical fiber 3, and continue to be amplified, and finally output through the first wavelength division multiplexer 2.
With the optical amplifier shown in fig. 4, since the reverse pumping mode is adopted during raman amplification, the nonlinear cost in the link fiber 01 can be reduced.
In another example, the optical amplifier uses a co-pumping approach and the link fiber 01 also uses a co-pumping approach. The co-pumping mode refers to a pumping mode in which the transmission direction of the signal light is the same as that of the pumping light. Fig. 5 exemplarily provides a schematic structural diagram of the optical amplifier. Referring to fig. 5, the optical amplifier includes a first pump module 1, a first wavelength division multiplexer 2, and a doped optical fiber 3. The first wavelength division multiplexer 2 is a three-port device, the first pump module 1 is connected to a first port of the first wavelength division multiplexer 2, a second port of the first wavelength division multiplexer 2 is connected to the doped optical fiber 3, and a third port of the first wavelength division multiplexer 2 can be used as an input port of the optical amplifier. The doped fiber 3 is connected to the link fiber 01, and the link fiber 01 is connected to the signal light output end of the doped fiber 3.
In the optical amplifier shown in fig. 5, signal light passes through the first wavelength division multiplexer 2, the doped optical fiber 3, and the link optical fiber 01 in this order. After being output from the first pump module 1, the raman pump light sequentially passes through the first wavelength division multiplexer 2, the doped optical fiber 3 and the link optical fiber 01. Specifically, the first pump module 1 outputs raman pump light. The first wavelength division multiplexer 2 couples raman pump light to the doped optical fiber 3 and outputs the received signal light to the doped optical fiber 3. The doped fiber 3 absorbs the raman pump light, amplifies the signal light inputted into the doped fiber 3, and outputs the amplified signal light to the link fiber 01. The doped fiber 3 also outputs the remaining pump light of the raman pump light to the link fiber 01. The link fiber 01 is relatively long, and can sufficiently absorb the remaining pump light, raman amplify the signal light inputted into the link fiber 01, and output the raman amplified signal light.
In one example, the signal light transmitted in the optical amplifier is wavelength division multiplexed signal light. The wavelength division multiplexed signal light includes signal light of a plurality of wavelength bands. For example, the wavelength range of the wavelength division multiplexing signal light may be 1520nm to 1630nm.
In one example, the optical amplifier may be an EDFA, with the doped fiber 3 being doped with at least erbium ions.
In one example, the signal light may be light of a conventional (C) band, light of a long (long) band, or light of a c+l band, and the doped fiber 3 may be a single-mode erbium-doped fiber, a large-mode-field erbium-doped fiber, a double-clad erbium-doped fiber, or the like.
In one example, the doped fiber 3 is directly connected to the link fiber 01, the doped fiber 3 is connected to the link fiber 01 by fusion, or the doped fiber 3 is connected to the link fiber 01 by a fiber connector.
The optical fiber connector may be any connector for connecting optical fibers, and embodiments of the present application are not limited thereto. By fusion-splicing, the loss can be reduced as compared with the optical fiber connector.
In one example, the raman pump light provided by the first pump module 1 comprises pump light of different wavelengths. Specifically, referring to the optical amplifier shown in fig. 6, the first pump module 1 includes a plurality of pump units 11 and a beam combining unit 12, the plurality of pump units 11 are respectively connected to the beam combining unit 12, and the beam combining unit 12 is connected to the first wavelength division multiplexer 2.
The plurality of pump units 11 can output a plurality of pump light with different wavelengths, each pump unit 11 outputs pump light with one wavelength, and the power of the pump light output by the plurality of pump units 11 can be the same or different. The beam combining unit 12 combines a plurality of pump light of different wavelengths into one beam of raman pump light. The beam combining unit 12 outputs raman pump light to the first wavelength division multiplexer 2. Fig. 6 is a schematic diagram of a reverse pumping mode, and the same direction pumping mode is similar, and will not be described herein.
Alternatively, in the case where the plurality of pump units 11 are two pump units 11, the polarization states of the two pump light outputted from the two pump units 11 may be orthogonal, and the beam combining unit 12 may be a polarization beam combiner.
Alternatively, the pump unit 11 may be a semiconductor laser, a fiber laser, a solid state laser, or the like.
Alternatively, the power of the raman pump light may be set according to actual needs. For example, the power of the raman pump light may be set such that the power of the remaining pump light does not burn out.
In one example, the wavelength range of the raman pump light is 1400nm to 1520nm. For example, the signal light is light of a C-band, and the raman pump light of the C-band is obtained by combining two pump lights in the range of 1400nm to 1499nm by the beam combining unit 12.
Alternatively, the wavelengths of the two pump lights are 1427nm and 1465nm.
In one example, the optical amplifier employs a bi-directional pumping scheme, and the raman pump light is transmitted in the opposite direction to the signal light. Specifically, the optical fiber amplifier includes a first pump module 1, a first wavelength division multiplexer 2, a doped optical fiber 3, a second pump module 5, and a second wavelength division multiplexer 6. The second pump module 5 can output a first pump light, which may be a single wavelength pump light. The second pump module 5 is connected to a second wavelength division multiplexer 6. The second wavelength division multiplexer 6 is connected to the doped optical fiber 3, see the optical amplifier shown in fig. 7.
In the optical amplifier shown in fig. 7, the second wavelength division multiplexer 6 receives the signal light input into the optical amplifier, and outputs the signal light to the doped optical fiber 3. The second wavelength division multiplexer 6 also couples the first pump light into the doped fiber 3, the transmission direction of the first pump light in the doped fiber 3 being the same as the transmission direction of the signal light in the doped fiber 3.
The first wavelength division multiplexer 2 couples raman pump light into the doped fiber 3, the transmission direction of the raman pump light in the doped fiber 3 being opposite to the transmission direction of the signal light in the doped fiber 3.
The doped optical fiber 3 absorbs the raman pump light and the first pump light, amplifies the signal light inputted into the doped optical fiber 3, and outputs the amplified signal light to the first wavelength division multiplexer 2. The doped fiber 3 also outputs the remaining pump light of the raman pump light to the link fiber 01. The link optical fiber 01 is relatively long, and can fully absorb the remaining pump light, raman amplify the signal light inputted into the link optical fiber 01, output the raman amplified signal light, and the raman amplified signal light is outputted to the doped optical fiber 3 through the second wavelength division multiplexer 6, and the doped optical fiber 3 continues to amplify the raman amplified signal light, and outputs the amplified signal light to the first wavelength division multiplexer 2. The first wavelength division multiplexer 2 outputs the amplified signal light.
In another example, the optical amplifier also adopts a bidirectional pumping mode, and the transmission direction of the raman pump light is the same as that of the signal light. Specifically, the optical fiber amplifier includes a first pump module 1, a first wavelength division multiplexer 2, a doped optical fiber 3, a second pump module 5, and a second wavelength division multiplexer 6. The second pump module 5 can output a first pump light, which may be a single wavelength pump light. The second pump module 5 is connected to a second wavelength division multiplexer 6. The second wavelength division multiplexer 6 is connected to the doped optical fiber 3, see the optical amplifier shown in fig. 8.
In the optical amplifier shown in fig. 8, the first wavelength division multiplexer 2 receives signal light input to the optical amplifier, and outputs the signal light to the doped optical fiber 3. The first wavelength division multiplexer 2 also couples raman pump light into the doped fiber 3, the transmission direction of the raman pump light in the doped fiber 3 being the same as the transmission direction of the signal light in the doped fiber 3.
The second wavelength division multiplexer 6 couples the first pump light into the doped fiber 3 in a direction opposite to the direction of transmission of the signal light in the doped fiber 3.
The doped optical fiber 3 absorbs the raman pump light and the first pump light, amplifies the signal light inputted into the doped optical fiber 3, and outputs the amplified signal light to the second wavelength division multiplexer 6. The doped fiber 3 also outputs the remaining pump light of the raman pump light to the second wavelength division multiplexer 6. The second wavelength division multiplexer 6 transmits the amplified signal light and the remaining pump light to the link optical fiber 01. The link fiber 01 is relatively long, and can sufficiently absorb the remaining pump light, raman amplify the signal light inputted into the link fiber 01, and output the raman amplified signal light.
In one example, in order that the light output by the optical amplifier does not return to the optical amplifier, an isolation module 7 is also included in the optical amplifier. In the case where the raman pump light is opposite in transmission direction to the signal light, the isolation module 7 is located on the transmission path of the signal light output from the first wavelength division multiplexer 2, see the optical amplifier shown in fig. 9. In the case where the raman pump light and the signal light have the same transmission direction, the isolation module 7 is located on the transmission path of the signal light output from the doped fiber 3, see the optical amplifier shown in fig. 10.
Wherein the isolation module 7 can prevent the light transmitted in the direction opposite to the transmission direction of the signal light from passing through. For example, the isolation module 7 may be an Isolator (ISO).
In one example, in order to flatten the gain spectrum of the signal light output by the optical amplifier, the optical amplifier further comprises a gain flattening filter module 8. In the case where the raman pump light is opposite in transmission direction to the signal light, the gain flattening filter module 8 is located on the transmission path of the signal light output from the first wavelength division multiplexer 2, see the optical amplifier shown in fig. 11. In the case where the raman pump light and the signal light have the same transmission direction, the gain flattening filter module 8 is located on the transmission path of the signal light output from the doped optical fiber 3, see the optical amplifier shown in fig. 12.
The gain flattening filter module 8 may be configured to flattening filter the signal light output from the doped fiber 3. For example, the gain flattening filter module 8 may be a gain flattening filter (gain flattening filters, GFF).
In one example, in order to make the power of the signal light output by the optical amplifier adjustable, the optical amplifier further comprises an adjustable optical attenuator 9. In the case where the raman pump light and the signal light are transmitted in opposite directions, the variable optical attenuator 9 is located on the transmission path of the signal light outputted from the first wavelength division multiplexer 2. In the case where the raman pump light and the signal light have the same transmission direction, the variable optical attenuator 9 is located on the transmission path of the signal light output from the doped fiber 3.
Wherein the variable optical attenuator 9 may be used to attenuate the signal light output by the doped fiber 3.
In an example, in the case where the optical amplifier includes the isolation module 7, the gain flattening filter module 8, and the adjustable optical attenuator 9, the signal light output from the erbium-doped fiber 3 sequentially passes through the isolation module 7, the gain flattening filter module 8, and the adjustable optical attenuator 9, see the optical amplifier shown in fig. 13. The optical amplifier shown in fig. 13 is an example in which the transmission direction of the raman pump light is opposite to that of the signal light, and the transmission direction of the raman pump light may be the same as that of the signal light.
It should be noted that the optical amplifier may also include any two of the isolation module 7, the gain flattening filter module 8, and the adjustable optical attenuator 9.
In one example, the optical amplifier is a multi-stage optical amplifier, and the optical amplifier further includes N doped fiber amplifying modules 4, where N is an integer greater than or equal to 1, and the gain medium of each doped fiber amplifying module 4 may be the same as the material of the doped fiber 3, and each doped fiber amplifying module 4 may amplify the transmitted signal light. The first wavelength division multiplexer 2 is located between the N doped fiber amplification modules 4 and the doped fiber 3. In the case where the raman pump light and the signal light are transmitted in opposite directions, the N doped fiber amplification modules 4 are located on the transmission path of the signal light outputted from the first wavelength division multiplexer 2, and the 1 st to N doped fiber amplification modules 4 are sequentially arranged along the transmission direction of the signal light, see the optical amplifier shown in fig. 14. The value of N in the embodiment of the application can be set according to actual needs.
In another example, the optical amplifier is a multi-stage optical amplifier, and the optical amplifier further includes N doped fiber amplifying modules 4, where N is an integer greater than or equal to 1, and the gain medium of each doped fiber amplifying module 4 may be the same as the material of the doped fiber 3, and each doped fiber amplifying module 4 may amplify the transmitted signal light. The first wavelength division multiplexer 2 is located between the N doped fiber amplification modules 4 and the doped fiber 3. In the case where the raman pump light and the signal light have the same transmission direction, the N doped fiber amplification modules 4 are located on the transmission path of the signal light inputted from the first wavelength division multiplexer 2, and the 1 st to N doped fiber amplification modules 4 are sequentially arranged along the transmission direction of the signal light, see the optical amplifier shown in fig. 15. The value of N in the embodiment of the application can be set according to actual needs.
In the optical amplifier shown in fig. 14 and 15, the power of the signal light can be made to reach the standard by using multi-stage amplification.
Optionally, in the case that the optical amplifier further includes N doped optical fiber amplifying modules 4, the optical amplifier further includes N isolation modules 7, an isolation module 7 is disposed between adjacent doped optical fiber amplifying modules 4, and an isolation module 7 is further disposed on a transmission path of the signal light output by the nth doped optical fiber amplifying module 4, see the optical amplifier shown in fig. 16, and in the optical amplifier shown in fig. 16, the value of N is 2. The isolation module 7 can prevent light transmitted in the direction opposite to the transmission direction of the signal light from passing through.
Alternatively, the doped fiber amplification module 4 may use a co-pumping mode, a counter-pumping mode, or a bi-directional pumping mode.
Alternatively, when the signal light includes light of the C-band, the wavelength of the pump light of the doped fiber amplification module 4 may be 980nm.
Alternatively, the structures of the N doped fiber amplification modules 4 may be identical or not identical. For example, the N doped fiber amplifying modules 4 all adopt a co-pumping mode. For another example, the ith doped fiber amplifying module 4 adopts a co-pumping mode, the jth fiber amplifying module 4 adopts a counter-pumping mode, the values of i and j belong to 1 to N, and i is not equal to j.
In one example, link fiber 01 may be a G652, G653, G654, G655, G656, or G657 model fiber. The embodiments of the present application are merely exemplary to provide several possible optical fibers, and the specific type of the link optical fiber 01 is not limited.
In the embodiment of the application, the doped optical fiber 3 and the link optical fiber 01 share the Raman pump light, and on the premise of ensuring the high inversion rate of the doped optical fiber 3, the link optical fiber is longer, so that the residual pump light can be absorbed, and the utilization rate of the pump light can be further improved. And the Raman pump light is firstly input into the doped optical fiber 3 and is absorbed partially, the power of the residual pump light is reduced compared with the power of the Raman pump light, the power of the residual pump light entering the link optical fiber 01 is reduced to an acceptable range, the problem that the power entering the link optical fiber 01 is too high during Raman amplification can be solved, and pumping protection measures such as OTDR (optical time domain reflectometer) and an interlocking switch are not needed.
In addition, when the transmission directions of the raman pump light and the signal light are opposite, the link optical fiber 01 performs raman amplification, which is equivalent to cascade connection of one DRA and one optical amplifier, and the DRA serves as a first-stage amplifier and the optical amplifier serves as a second-stage amplifier, and since the Noise Figure (NF) of the DRA is relatively low, the noise figure can be effectively low.
In addition, in a future large-capacity optical fiber transmission system, because of the limitation of the OSNR, the optical amplifier with low noise coefficient is a key device for the whole optical fiber transmission system, and the optical amplifier and the link optical fiber 01 are used together as a safe and easy-to-use amplifier in the future.
In the embodiment of the present application, for convenience of explanation and experimental verification, an optical amplifier using two-stage amplification is taken as an example, and referring to the optical amplifier shown in fig. 17, the optical amplifier is a doped optical fiber 3 using an erbium-doped optical fiber. The gain produced by link fiber 01 is denoted as G opt The gain produced by the doped fiber 3 is denoted as G EDF . See the results of the performance simulation and measurement of the optical amplifier shown in fig. 18. In fig. 18, the performance of the optical amplifier includes gain and noise figure, the optical amplifier can achieve 19-25 dB gain, and at the position of the 24dB gain point (i.e., gain gradient is 4 dB), the maximum noise figure is about 2.5dB, and the simulation and actual measurement results are aligned. And from the actual measurement result and the simulation result, the power of the remaining pump light entering the link optical fiber 01 is less than 24.5dBm, wherein the reason for selecting 24.5dBm as the optimal fiber entering power is as follows: the output power of the high power EDFA in the C-band is 24.5dBm, so 24.5dBm is an acceptable value for the incoming power of the link fiber 01, and the external fiber optic connector, i.e. the fiber optic connector, of the present EDFA can be used without safety precautions as such.
For the two-stage optical amplifier shown in fig. 17, the overall noise figure is expressed as nf1+ (l×nf2-1)/G1 (linear unit) NF1 is the noise figure of the first stage of the optical amplifier, NF2 is the noise figure of the second stage of the optical amplifier, G1 is the gain of the first stage of the optical amplifier, and L is the insertion loss between the two stages of the optical amplifier. From this equation, NF1 and G1 are two key parameters that ensure that the overall noise figure of the optical amplifier remains low when NF1 is small enough and G1 is large enough.
Due to G opt And G EDF Is the gain generated by the same pump source (i.e. the first pump module 1), so the two blocks can be regarded as a whole as the first stage of a two-stage optical amplifier, i.e. g1=g opt +G EDF . One of the benefits of this scheme is that the power of the pump light on the line side is reduced, and since the gain of the raman amplification is proportional to the power of the pump light within a certain range, it is obvious that G opt <G Raman (Raman) ，G Raman (Raman) The gain G of the erbium-doped fiber is not the gain obtained when the Raman pump light directly enters the link fiber 01 in the embodiment of the application EDF The gain and noise figure for the entire two-stage optical amplifier must be degraded so that the addition of the erbium doped fiber just increases the gain G1 of the first stage. And g1=g from simulation and actual measurement results opt +G EDF >G Raman (Raman) With reference to the noise figure equation of the two-stage optical amplifier, the addition of the erbium-doped fiber improves G1, and still can keep the overall noise figure at a low level.
The embodiment of the application also provides an optical amplifying method, which is applied to the optical amplifier described in the foregoing. As can be seen from the foregoing description, the optical amplifier comprises a first pump module 1, a first wavelength division multiplexer 2 and a doped optical fiber 3. The first pump module 1 outputs raman pump light to the first wavelength division multiplexer 2, which first wavelength division multiplexer 2 couples raman pump light to the doped fiber 3. The doped fiber 3 absorbs the raman pump light, amplifies and outputs the signal light inputted to the optical amplifier, and outputs the remaining pump light of the raman pump light as the pump light in the link fiber to the link fiber 01 connected to the optical amplifier. In this way, the doped optical fiber 3 and the link optical fiber 01 can share the raman pump light, so that the utilization ratio of the pump light is relatively high.
In one example, the optical amplifier is the optical amplifier shown in fig. 4, and the signal light sequentially passes through the link optical fiber 01, the doped optical fiber 3, and the first wavelength division multiplexer 2. The pump light passes through the first pump module 1, the first wavelength division multiplexer 2, the doped optical fiber 3 and the link optical fiber 01 in sequence. Specifically, the first pump module 1 outputs raman pump light. The first wavelength division multiplexer 2 couples raman pump light to the doped fiber 3. The doped fiber 3 absorbs the raman pump light, amplifies the signal light inputted into the doped fiber 3, and outputs the amplified signal light. The signal light inputted to the doped fiber 3 is the signal light outputted from the link fiber 01. The doped fiber 3 also outputs the remaining pump light of the raman pump light to the link fiber 01. The link optical fiber 01 absorbs the remaining pump light, raman amplifies the signal light inputted into the link optical fiber 01, and the raman amplified signal light is outputted to the doped optical fiber 3, and is continuously amplified, and finally outputted through the first wavelength division multiplexer 2.
Thus, since the reverse pumping mode is adopted during raman amplification, the nonlinear cost in the link fiber 01 can be reduced.
The detailed description of the method of light amplification is referred to in the foregoing description and will not be repeated here.
The terms "first" and "second" and the like in the present application are used to distinguish between identical items or similar items that have substantially the same function and function, and it should be understood that there is no logical or chronological dependency between the "first" and the "second" and that no limitation is imposed on the number and order of execution. It will be further understood that, although the following description uses the terms first, second, etc. to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another element. For example, a first pump module may be referred to as a second pump module, and similarly, a second pump module may be referred to as a first pump module, without departing from the scope of the various examples. The first pump module and the second pump module may both be pump modules, and in some cases may be separate and distinct pump modules.
The term "at least one" in the present application means one or more, and the term "plurality" in the present application means two or more.
The foregoing description is merely illustrative of the present application, and the scope of the present application is not limited thereto, and any equivalent modifications or substitutions will be apparent to those skilled in the art within the scope of the present application, and are intended to be included within the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.

Claims (12)

1. An optical amplifier, characterized in that it comprises a first pump module (1), a first wavelength division multiplexer (2) and a doped optical fiber (3);
the first pumping module (1) is used for outputting Raman pump light;
-the first wavelength division multiplexer (2) is arranged for coupling the raman pump light to the doped optical fiber (3);
the doped optical fiber (3) is used for absorbing the Raman pump light, amplifying and outputting the signal light input into the optical amplifier, and outputting the rest pump light in the Raman pump light to the link optical fiber (01) connected with the optical amplifier, wherein the rest pump light is used as the pump light in the link optical fiber (01).
2. Optical amplifier according to claim 1, characterized in that the transmission direction of the signal light is opposite to the transmission direction of the raman pump light transmitted in the doped fiber (3);
the transmission direction of the signal light is opposite to the transmission direction of the rest of the pump light in the link optical fiber (01).
3. Optical amplifier according to claim 1, characterized in that the transmission direction of the signal light is the same as the transmission direction of the raman pump light transmitted in the doped fiber (3);
the transmission direction of the signal light is the same as the transmission direction of the rest of the pump light in the link optical fiber (01).
4. An optical amplifier according to any one of claims 1 to 3, characterized in that the doped optical fiber (3) is fused to the link optical fiber (01) or connected by an optical fiber connector.
5. Optical amplifier according to any of claims 1 to 4, characterized in that the first pump module (1) comprises a plurality of pump units (11) and a beam combining unit (12);
the plurality of pumping units (11) are used for outputting pumping light with a plurality of different wavelengths;
the beam combining unit (12) is configured to combine the pump light with the plurality of different wavelengths into one beam of the raman pump light.
6. The optical amplifier according to any one of claims 1 to 5, wherein the raman pump light has a wavelength in the range of 1400nm to 1520nm.
7. The optical amplifier according to any one of claims 1 to 6, further comprising N doped fiber amplification modules (4), N being an integer greater than or equal to 1;
the 1 st to the N-th doped fiber amplification modules (4) in the N doped fiber amplification modules (4) are sequentially arranged along the transmission direction of the signal light;
the first wavelength division multiplexer (2) is located between the N doped optical fiber amplifying modules (4) and the doped optical fibers (3).
8. An optical amplifier according to any of claims 1 to 3, characterized in that the optical amplifier further comprises a second pump module (5) and a second wavelength division multiplexer (6);
the second pumping module (5) is used for outputting first pumping light;
-said second wavelength division multiplexer (6) for coupling said first pump light to said doped optical fiber (3);
the doped optical fiber (3) is used for absorbing the Raman pump light and the first pump light, amplifying and outputting the signal light, and the transmission direction of the first pump light is opposite to that of the Raman pump light.
9. An optical amplifier according to any of claims 1 to 8, characterized in that the optical amplifier (1) further comprises an isolation module (7);
the isolation module (7) is used for preventing light transmitted in the direction opposite to the transmission direction of the signal light from passing through.
10. A method of optical amplification, characterized in that it is applied to an optical amplifier according to any of claims 1 to 9, comprising a first pump module (1), a first wavelength division multiplexer (2) and a doped optical fiber (3), the method comprising:
the first pump module (1) outputs Raman pump light to the first wavelength division multiplexer (2);
-the first wavelength division multiplexer (2) coupling the raman pump light to the doped fiber (3);
the doped optical fiber (3) absorbs the Raman pump light, amplifies and outputs the signal light input into the optical amplifier, and outputs the rest of the Raman pump light to the link optical fiber (01) connected with the optical amplifier, wherein the rest of the Raman pump light is used as the pump light in the link optical fiber.
11. Method according to claim 10, characterized in that the transmission direction of the signal light is opposite to the transmission direction of the raman pump light transmitted in the doped fiber (3);
the transmission direction of the signal light is opposite to the transmission direction of the rest of the pump light in the link optical fiber (01).
12. An optical fiber communication system comprising a first network element, a second network element, and at least one optical amplifier according to any one of claims 1 to 9;
the optical amplifier is located between the first network element and the second network element.
CN202210507453.8A 2022-05-10 2022-05-10 Optical amplifier, optical amplifying method and optical fiber communication system Pending CN117080847A (en)

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EP1841022A3 (en) * 1995-03-20 2009-12-02 Fujitsu Limited Apparatus and method for processing an optical signal
WO2001065646A2 (en) * 2000-02-29 2001-09-07 Jds Uniphase Corporation Multiple stage optical fiber amplifier
EP1233484A1 (en) * 2001-02-14 2002-08-21 Alcatel Optical fibre amplifier
KR100757074B1 (en) * 2006-04-06 2007-09-10 한국과학기술연구원 A bidirectional wavelength division multiplexing passive optical network(wdm-pon) based in raman amplification using spectrum sliced amplified spontaneous emission(ase) upstream source pumped by residual raman pump
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