CN107196180B - Cascade remote optical amplification system - Google Patents
Cascade remote optical amplification system Download PDFInfo
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- CN107196180B CN107196180B CN201710533741.XA CN201710533741A CN107196180B CN 107196180 B CN107196180 B CN 107196180B CN 201710533741 A CN201710533741 A CN 201710533741A CN 107196180 B CN107196180 B CN 107196180B
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- H—ELECTRICITY
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- 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
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- 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
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- 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
- H01S3/0915—Processes or apparatus for excitation, e.g. pumping using optical pumping by incoherent light
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- 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
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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Abstract
The present invention provides a cascaded remote optical amplification system, the system comprises an optical transmitting device, 2 forward remote gain modules, a front end composite pump source, 2 backward remote gain modules, a rear end composite pump source and an optical receiving device; the light emitting device is used for generating input signal light of the system; the first output end of the front-end composite pump source is connected with the second input end of the 1 st forward remote gain module RGU11 through the 1 st section of front-end bypass optical fiber; the second output end of the front end composite pump source is connected with the second input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end bypass optical fiber; the first output end of the rear-end composite pump source is connected with the second input end of the 1 st backward remote gain module RGU1 through the 1 st section of rear-end bypass optical fiber; the second output end of the rear-end composite pump source is connected with the second input end of the 2 nd backward remote gain module RGU2 through the 2 nd section of rear-end bypass optical fiber; the invention has long transmission distance and good gain flatness.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a cascade remote optical amplification system.
Background
In special application occasions of submarine transmission or land, an active relay and monitoring system cannot be established in a transmission link due to natural condition limitation; or the operation and maintenance cost after the active relay is used is not acceptable to operators, and the single-span unrepeatered transmission distance must be increased. The absorption and scattering of the optical fiber cause the attenuation of the optical signal, the dispersion of the optical fiber causes the pulse broadening, the optical signal to noise ratio is reduced, the error rate is increased, and the transmission distance of the communication system is limited. The most important limiting factor of the relay-free transmission distance is as follows: signal power is limited (the signal power at the receiving end is too low to meet the minimum sensitivity requirement of the receiver), optical signal to noise ratio (OSNR) is limited, dispersion is limited and nonlinearity is limited (e.g., stimulated raman scattering SRS, stimulated brillouin scattering SBS, etc.).
Although the traditional remote pump amplification technology can provide a certain gain, when the pump power exceeds 1W, serious spontaneous Raman laser is generated in the optical fiber, if the amplification is carried out along the path, the spontaneous Raman laser can cause interference to a transmission signal, and error codes of a system are caused. If bypass amplification is adopted, the raman self-excitation effect also causes the waste of pumping power, so that the effective pumping power entering the gain module is limited, and the further improvement of the transmission distance is limited.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a cascade remote optical amplification system which can obviously improve the optical transmission distance, and the system can realize high-order remote pumping amplification by adopting a composite pumping source with very low cost so as to further improve the transmission distance; the composite pumping source overcomes the nonlinear phenomena of stimulated Brillouin scattering, raman lasing and the like caused by the fact that the power density of a pumping source formed by a traditional single coherent light source is too high in an optical fiber, so that the pumping power reaching a remote gain module is higher, and a larger gain is generated in the remote gain module. The technical scheme adopted by the invention is as follows:
the cascade remote optical amplification system combining a forward pumping mode and a reverse pumping mode comprises an optical transmitting device, 2 forward remote gain modules, a front end composite pumping source, 2 backward remote gain modules, a rear end composite pumping source and an optical receiving device; the light emitting device is used for generating input signal light of the system;
the output end of the light emitting device is connected with the first input end of the 1 st forward remote gain module RGU11 through the 1 st section of front end transmission optical fiber, and the output end of the 1 st forward remote gain module RGU11 is connected with the first input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end transmission optical fiber; the output end of the 2 nd forward remote gain module RGU12 is connected with the first input end of the 2 nd backward remote gain module RGU2 through an intermediate transmission optical fiber; the output end of the 2 nd backward remote gain module RGU2 is connected with the first input end of the 1 st backward remote gain module RGU1 through the 2 nd section of rear end transmission optical fiber; the output end of the 1 st backward remote gain module RGU1 is connected with the input end of the light receiving device through the 1 st section of rear end transmission optical fiber;
the front-end composite pump source and the rear-end composite pump source have the same structure and both comprise a first output end and a second output end;
the first output end of the front-end composite pump source is connected with the second input end of the 1 st forward remote gain module RGU11 through the 1 st section of front-end bypass optical fiber; the second output end of the front end composite pump source is connected with the second input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end bypass optical fiber;
the first output end of the rear-end composite pump source is connected with the second input end of the 1 st backward remote gain module RGU1 through the 1 st section of rear-end bypass optical fiber; the second output end of the rear-end composite pump source is connected with the second input end of the 2 nd backward remote gain module RGU2 through the 2 nd section of rear-end bypass optical fiber;
the first output ends of the front-end composite pump source and the rear-end composite pump source are used for outputting at least 1-order pump light generated by the 1-order incoherent pump source;
the second output ends of the front-end composite pump source and the rear-end composite pump source are used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal optical spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal optical spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source.
Further, the front end composite pump source and the rear end composite pump source comprise a 1-order incoherent pump source, a 2-order coherent pump source, a broadband combiner and a power beam splitter; wherein the 1-order incoherent pump source is one, and the 2-order coherent pump source is one or a plurality of the 2-order incoherent pump sources;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the composite pump source; the public end of the broadband combiner is used as a second output end of the composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the composite pump source;
the 1-order incoherent pumping source adopts an incoherent broadband light source; the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source.
Further, the method comprises the steps of,
the center wavelength of the 1-order incoherent pump source is between 1420nm and 1480nm, and the 3dB bandwidth is between 10 nm and 100 nm;
the central wavelength of the 2-order coherent pump source is 1320 nm-1380 nm, and the 3dB bandwidth is 0.1-5 nm;
the power of the 2-order coherent pump source is higher than that of the 1-order incoherent pump source.
Further, the length of the front-end bypass optical fiber of the 1 st section is equal to the length of the front-end transmission optical fiber of the 1 st section, and the length of the front-end bypass optical fiber of the 2 nd section is equal to the sum of the lengths of the front-end transmission optical fibers of the 1 st section and the 2 nd section;
the length of the 1 st section of rear end bypass optical fiber is equal to the length of the 1 st section of rear end transmission optical fiber, and the length of the 2 nd section of rear end bypass optical fiber is equal to the sum of the lengths of the 1 st section of rear end transmission optical fiber and the 2 nd section of rear end transmission optical fiber.
The invention also provides a cascade remote optical amplification system in a forward pumping mode, which comprises an optical transmitting device, 2 forward remote gain modules, a front-end composite pumping source and an optical receiving device; the light emitting device is used for generating input signal light of the system;
the output end of the light emitting device passes through the 1 st section front end transmission optical fiber a first input of the 1 st forward remote gain module RGU11 is connected, the output end of the 1 st forward remote gain module RGU11 is connected with the first input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end transmission optical fiber; the output end of the 2 nd forward remote gain module RGU12 is connected with an optical receiving device through an intermediate transmission optical fiber;
the front-end composite pump source comprises a first output end and a second output end;
the first output end of the front-end composite pump source is connected with the second input end of the 1 st forward remote gain module RGU11 through the 1 st section of front-end bypass optical fiber; the second output end of the front end composite pump source is connected with the second input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end bypass optical fiber;
the first output end of the front-end composite pump source is used for outputting at least 1-order pump light generated by the 1-order incoherent pump source;
the second output end of the front-end composite pump source is used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal optical spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal optical spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source.
Further, the front-end composite pump source comprises a 1-order incoherent pump source, a 2-order coherent pump source, a broadband combiner and a power beam splitter; wherein the 1-order incoherent pump source is one, and the 2-order coherent pump source is one or a plurality of the 2-order incoherent pump sources;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the front-end composite pumping source; the public end of the broadband combiner is used as a second output end of the front-end composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the front-end composite pump source;
the 1-order incoherent pumping source adopts an incoherent broadband light source; the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source.
Further, the method comprises the steps of,
the center wavelength of the 1-order incoherent pump source is between 1420nm and 1480nm, and the 3dB bandwidth is between 10 nm and 100 nm;
the central wavelength of the 2-order coherent pump source is 1320 nm-1380 nm, and the 3dB bandwidth is 0.1-5 nm;
the power of the 2-order coherent pump source is higher than that of the 1-order incoherent pump source.
The invention also provides a cascade remote optical amplification system in a reverse pumping mode, which comprises an optical transmitting device, 2 backward remote gain modules, a rear-end composite pumping source and an optical receiving device; the light emitting device is used for generating input signal light of the system;
the output end of the light emitting device is connected with the first input end of the 2 nd backward remote gain module RGU2 through an intermediate transmission optical fiber; the output end of the 2 nd backward remote gain module RGU2 is connected with the first input end of the 1 st backward remote gain module RGU1 through the 2 nd section of rear end transmission optical fiber; the output end of the 1 st backward remote gain module RGU1 is connected with the light receiving device through the 1 st section of rear end transmission optical fiber;
the rear end composite pump source comprises a first output end and a second output end;
the first output end of the rear-end composite pump source is connected with the second input end of the 1 st backward remote gain module RGU1 through the 1 st section of rear-end bypass optical fiber; the second output end of the rear-end composite pump source is connected with the second input end of the 2 nd backward remote gain module RGU2 through the 2 nd section of rear-end bypass optical fiber;
the first output end of the back-end composite pump source is used for outputting at least 1-order pump light generated by the 1-order incoherent pump source;
the second output end of the back end composite pump source is used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal optical spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal optical spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source.
Further, the back-end composite pump source comprises a 1-order incoherent pump source, a 2-order coherent pump source, a broadband combiner and a power beam splitter; wherein the 1-order incoherent pump source is one, and the 2-order coherent pump source is one or a plurality of the 2-order incoherent pump sources;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the rear-end composite pumping source; the public end of the broadband combiner is used as a second output end of the rear-end composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the rear-end composite pump source;
the 1-order incoherent pumping source adopts an incoherent broadband light source; the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source.
Further, the method comprises the steps of,
the center wavelength of the 1-order incoherent pump source is between 1420nm and 1480nm, and the 3dB bandwidth is between 10 nm and 100 nm;
the central wavelength of the 2-order coherent pump source is 1320 nm-1380 nm, and the 3dB bandwidth is 0.1-5 nm;
the power of the 2-order coherent pump source is higher than that of the 1-order incoherent pump source.
The invention has the advantages that:
1) The remote pump source (front end composite pump source and rear end composite pump source) selects a coherent light source and an incoherent light source to be combined, the high power characteristic of the coherent light source and the broadband spectrum characteristic of the incoherent light source are fully utilized, a broadband 1-order pump source with enhanced power is obtained, the 1-order pump source is used as a direct pump source of the erbium-doped optical fiber, and high gain is obtained in the erbium-doped optical fiber;
2) The frequency selection of the two light sources of the remote pump source is innovative: the frequency components of the two light sources together with the frequency of the input signal light form a 3-stage cascaded raman shift: the coherent light source is 2 stages, and the incoherent light source is 1 stage; the signal light is of level 0; the pump light emitted by the two light sources is synthesized by the wavelength combiner and then enters the bypass optical fiber, the 2-order coherent pump light in the bypass optical fiber transfers the power to the 1-order incoherent pump light, and the 1-order incoherent pump light is amplified, so that the optical fiber loss is effectively overcome, and the pump light can be transmitted to a farther place; in this way, the transmission distance is effectively prolonged.
3) The composite pump source has obvious cost advantage by adopting 2 light sources to replace the traditional multiple semiconductor lasers with different wavelengths.
4) The nonlinear phenomena of stimulated Brillouin scattering, raman spontaneous emission and the like caused by overhigh power density of a pumping source formed by a traditional single coherent light source in an optical fiber are overcome, so that the pumping power of the erbium-doped optical fiber in a remote gain module is higher, and further, larger gain is generated in the remote gain module, and the larger gain also means a longer transmission distance.
Drawings
Fig. 1 is a schematic diagram of raman pump frequency shift.
Fig. 2 is a schematic diagram of a cascade remote optical amplification system combining a forward pumping mode and a reverse pumping mode according to the present invention.
Fig. 3 is a schematic diagram of the raman pump frequency shift of the present invention.
Fig. 4 is a schematic diagram of a remote gain module according to the present invention.
FIG. 5 is a block diagram of a composite pump source of the present invention.
FIG. 6 is another block diagram of a composite pump source of the present invention.
Fig. 7 is a schematic diagram of a tandem remote optical amplification system in a forward pumping mode according to the present invention.
Fig. 8 is a schematic diagram of a tandem remote optical amplification system of the reverse pumping mode of the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
The principle of the high-order Raman pumping frequency shift is that high-power short-wavelength pumping light is used for transferring power to long-wavelength pumping light through a gain fiber, and then long-wavelength pumping light is used for pumping signal light; as shown in fig. 1, the signal light spectrum of wavelength 15xx nanometers is located at the 2-order raman shift of the pump light spectrum of wavelength 13xx nanometers, and the signal light spectrum of wavelength 15xx nanometers is located at the 1-order raman shift of the pump light spectrum of wavelength 14xx nanometers; the transfer process of the pump is from 13xx- >14xx- >15xx nanometers; p21 and P22 are 2-order pump light, P11, P12, P13 and P14 are 1-order pump light, and light of 15xx nanometers is signal light;
the 1-order pump light and the 2-order pump light are both generated by a coherent light source, and the coherent light source can adopt a Raman fiber laser or a semiconductor laser, and has the characteristics of good monochromaticity, consistent phase, high output power and the like; however, because the bandwidth of the coherent light source is narrow, for example, its 3dB bandwidth is typically between 0.1 and 3 nm; in order to obtain a flat gain characteristic, for example, 4 to 6 semiconductor lasers are generally required to obtain a flat gain of 1dB, and if the gain flatness of 0.5dB is required to be obtained, 8 to 10 semiconductor lasers with different wavelengths are generally required to be combined to form a composite pumping source;
the invention utilizes the principle and improves the compound pump source, designs a cascade remote optical amplification system, and the following is a specific implementation mode of the cascade remote optical amplification system:
a cascade remote optical amplification system combining a forward pumping mode and a reverse pumping mode; as shown in fig. 2;
the system comprises an optical emission device, 2 forward remote gain modules, a front end composite pump source, 2 backward remote gain modules, a rear end composite pump source and an optical receiving device; the light emitting device can generate input signal light of the system;
the output end of the light emitting device is connected with the first input end of the 1 st forward remote gain module RGU11 through the 1 st section of front end transmission optical fiber, and the output end of the 1 st forward remote gain module RGU11 is connected with the first input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end transmission optical fiber; the output end of the 2 nd forward remote gain module RGU12 is connected with the first input end of the 2 nd backward remote gain module RGU2 through an intermediate transmission optical fiber; the output end of the 2 nd backward remote gain module RGU2 is connected with the first input end of the 1 st backward remote gain module RGU1 through the 2 nd section of rear end transmission optical fiber; the output end of the 1 st backward remote gain module RGU1 is connected with the input end of the light receiving device through the 1 st section of rear end transmission optical fiber;
the front-end composite pump source and the rear-end composite pump source have the same structure and both comprise a first output end and a second output end;
the first output end of the front-end composite pump source is connected with the second input end of the 1 st forward remote gain module RGU11 through the 1 st section of front-end bypass optical fiber; the second output end of the front end composite pump source is connected with the second input end of the 2 nd forward remote gain module RGU12 through the 2 nd section of front end bypass optical fiber;
the first output end of the rear-end composite pump source is connected with the second input end of the 1 st backward remote gain module RGU1 through the 1 st section of rear-end bypass optical fiber; the second output end of the rear-end composite pump source is connected with the second input end of the 2 nd backward remote gain module RGU2 through the 2 nd section of rear-end bypass optical fiber;
the first output ends of the front-end composite pump source and the rear-end composite pump source are used for outputting at least 1-order pump light generated by the 1-order incoherent pump source; the first output ends of the front-end composite pump source and the rear-end composite pump source can also contain 2-order pump light generated by a 2-order coherent pump source;
the second output ends of the front-end composite pump source and the rear-end composite pump source are used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
in terms of frequency selection, the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal light spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal light spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source, as shown in fig. 3;
the optical launch device and the front-end compound pump source are typically located at the same location, such as in the same launch room, whereby the length of the segment 1 front-end bypass fiber is equal to the length of the segment 1 front-end transmission fiber, as shown by length L11 in fig. 2; the length of the 2 nd front-end bypass fiber is equal to the sum of the lengths of the 1 st and 2 nd front-end transmission fibers, as shown by the length l11+l12 in fig. 2; of course, it is also possible that the front-end compound pump is provided separately from the light emitting device.
The optical receiving device and the back-end composite pump source are typically disposed at the same location, such as in the same receiving room, whereby the length of the 1 st section of back-end bypass fiber is equal to the length of the 1 st section of back-end transmission fiber, as shown by length L1 in fig. 2; the length of the 2 nd section of rear end bypass fiber is equal to the sum of the lengths of the 1 st and 2 nd sections of rear end transmission fiber, as shown by the length L1+L2 in FIG. 2; of course, it is also possible that the rear end compound pump source is provided separately from the light receiving device.
The length of the intermediate transmission optical fiber is L3; the lengths of the L1 and the L11 are 70-100 km, and the lengths of the L2 and the L12 are 40-80 km;
the forward remote gain module and the backward remote gain module can adopt the same structure, and comprise a built-in combiner, a gain fiber and an isolator; the first input end of the built-in combiner is used as the first input end of the forward remote gain module or the backward remote gain module, and the second input end of the built-in combiner is used as the second input end of the forward remote gain module or the backward remote gain module; the public end of the built-in combiner is connected with one end of the gain optical fiber; the other end of the gain fiber is connected with one end of the isolator, and the other end of the isolator is used as the output end of the forward remote gain module or the backward remote gain module;
the structures of the front-end composite pump source and the rear-end composite pump source are shown in fig. 5 and 6, and the front-end composite pump source comprises a 1-order incoherent pump source, a 2-order coherent pump source, a broadband combiner and a power beam splitter; wherein the 1-order incoherent pump source is usually one, and the 2-order coherent pump source can be one or a plurality of the 1-order incoherent pump sources;
two connection modes can be arranged in the composite pump source; as shown in fig. 5 and 6, respectively;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the composite pump source; the public end of the broadband combiner is used as a second output end of the composite pump source; when only one 2-order coherent pump source exists, a front-end combiner is not needed; in the connection mode, only 1-order pump light exists in the first output end of the composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the composite pump source; when only one 2-order coherent pump source exists, a front-end combiner is not needed; in the connection mode, the first output end and the second output end of the composite pump source both contain 1-order pump light and 2-order pump light;
the 1-order incoherent pumping source adopts an incoherent broadband light source, the central wavelength is 1420-1480 nm, and the 3dB bandwidth is 10-100 nm; the 1-order incoherent pump source can adopt a spontaneous radiation light source or an LED light source, and is not of a laser type;
the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source; the power of the 2-order coherent pump source is higher than that of the 1-order incoherent pump source, and is usually higher than 1W, and the pump power of the 1-order incoherent pump source is generally within 1W; the central wavelength of the 2-order coherent pump source is 1320 nm-1380 nm, and the 3dB bandwidth is 0.1-5 nm;
in the example shown in FIG. 3, 2-order coherent pump sources in the wavelength range 1320nm to 1380nm are employed; p21 and P22 are 2-order pump light;
for the forward pumping part (comprising a front-end composite pump source, a forward remote gain module RGU11 and an RGU 12) of the cascade remote optical amplification system, if the first output end of the front-end composite pump source only contains 1-order pump light, the 1-order pump light reaches the RGU11 through a 1 st section of front-end bypass optical fiber with the length of L11, signal light sent by an optical emission device through a transmission optical fiber enters an erbium-doped optical fiber in the forward remote gain module, encounters the residual 1-order pump light transmitted by the front-end composite pump source, and is coupled and amplified in the erbium-doped optical fiber, and an amplified optical signal can be continuously transmitted along a subsequent transmission optical fiber;
for the case that the output end of the front-end composite pump source contains 1-order pump light and 2-order pump light, before the pump light reaches the forward remote gain module, the power of the 2-order pump light is transferred to the 1-order pump light through Raman frequency shift in the front-end bypass optical fiber, so that the signal power of the 1-order pump light is increased, and the 1-order pump light is further pushed to RGU12 with a longer receiving distance (distance L11+L12); the RGU12 can be placed farther from the light emitting device to enable the signal light to gain anyway;
the combination of the composite pump source reduces the power requirement on the 1 st-order incoherent pump source, and because the power of the 2 nd-order coherent pump source is transferred to the 1 st-order incoherent pump source in the bypass optical fiber through Raman frequency shift, the transfer is gradually carried out in transmission, so that large 1 st-order pump power cannot occur everywhere in the optical fiber.
By selecting a 2-order coherent light source with high power and a broadband 1-order incoherent light source with lower power and cascading Raman frequency shift formed by the two frequencies, pump light of a direct pump source of signal light is amplified while being transmitted in a bypass optical fiber. The pumping light source overcomes the nonlinear phenomena of stimulated Brillouin scattering, raman laser and the like caused by overhigh power density of a Raman pumping source formed by a traditional single coherent light source in an optical fiber, can inject higher 1-order power and 2-order power, improves pumping power reaching a remote gain module RGU, and generates larger gain in the RGU; injecting higher pump power without lasing means that the pump power can be pushed further away, further increasing the distance of the remote gain module from its remote pump source (which is equivalent to the distance of the remote gain module from the light emitting or receiving device), further increasing the transmission distance.
The other advantage of the improved composite pump source is obvious, the combined Raman pump source formed by combining the 2-order coherent light source and the 1-order incoherent light source fully utilizes the characteristics of good monochromaticity, consistent phase and high power output of the coherent light source, and simultaneously utilizes the characteristic of wide bandwidth of the incoherent light source, so that the broadband flat high-gain spectrum can be realized by only two light sources. By adopting a small number of light sources, a 1-order flat gain spectrum with higher power can be obtained, and the cost is saved.
The optical transmitting device is shown in fig. 2, and comprises a transmitting end TX, a dispersion pre-compensation module (DCM near TX in fig. 2) and a power amplifier; the optical receiving device comprises a pre-amplifier, a dispersion compensating module (DCM near RX in figure 2) and a receiving end RX; these two parts are not the focus of the present invention, and the technology is mature and will not be described in detail.
(II) a cascade remote optical amplification system adopting a forward pumping mode;
based on fig. 2, the rear end composite pump source, two backward remote gain modules RGU1, RGU2, and corresponding rear end bypass optical fiber and rear end transmission optical fiber are removed, so that the cascade remote optical amplification system in the forward pumping mode shown in fig. 7 is formed; the principle of operation is similar to that of fig. 2;
a third cascade remote optical amplification system of reverse pumping mode;
based on fig. 2, the front-end composite pump source, the two forward remote gain modules RGU11, RGU12, and the corresponding front-end bypass fiber and front-end transmission fiber are removed, so as to form the backward pumping type cascade remote optical amplification system shown in fig. 8; the principle of operation is similar to that of fig. 2.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (10)
1. The cascade remote optical amplification system is characterized by comprising an optical emission device, 2 forward remote gain modules, a front-end composite pump source, 2 backward remote gain modules, a rear-end composite pump source and an optical receiving device; the light emitting device is used for generating input signal light of the system;
the output end of the light emitting device is connected with the first input end of a 1 st forward remote gain module (RGU 11) through a 1 st section of front end transmission optical fiber, and the output end of the 1 st forward remote gain module (RGU 11) is connected with the first input end of a 2 nd forward remote gain module (RGU 12) through a 2 nd section of front end transmission optical fiber; the output of the 2 nd forward remote gain module (RGU 12) is connected to the first input of the 2 nd backward remote gain module (RGU 2) through an intermediate transmission fiber; the output end of the 2 nd backward remote gain module (RGU 2) is connected with the first input end of the 1 st backward remote gain module (RGU 1) through the 2 nd section of rear end transmission optical fiber; the output end of the 1 st backward remote gain module (RGU 1) is connected with the input end of the light receiving device through the 1 st section of rear end transmission optical fiber;
the front-end composite pump source and the rear-end composite pump source have the same structure and both comprise a first output end and a second output end;
the first output end of the front end composite pump source is connected with the second input end of the 1 st forward remote gain module (RGU 11) through the 1 st section of front end bypass optical fiber; the second output end of the front end composite pump source is connected with the second input end of the 2 nd forward remote gain module (RGU 12) through the 2 nd section of front end bypass optical fiber;
the first output end of the rear-end composite pump source is connected with the second input end of the 1 st backward remote gain module (RGU 1) through the 1 st section of rear-end bypass optical fiber; the second output end of the rear end composite pump source is connected with the second input end of a 2 nd backward remote gain module (RGU 2) through a 2 nd section of rear end bypass optical fiber;
the first output ends of the front-end composite pump source and the rear-end composite pump source are used for outputting at least 1-order pump light generated by the 1-order incoherent pump source;
the second output ends of the front-end composite pump source and the rear-end composite pump source are used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal optical spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal optical spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source.
2. The cascaded remote optical amplification system of claim 1,
the front end composite pump source and the rear end composite pump source comprise a 1-order incoherent pump source, one or more 2-order coherent pump sources, a broadband combiner and a power beam splitter;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the composite pump source; the public end of the broadband combiner is used as a second output end of the composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the composite pump source;
the 1-order incoherent pumping source adopts an incoherent broadband light source; the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source.
3. The cascaded remote optical amplification system of claim 2,
the center wavelength of the 1-order incoherent pump source is between 1420nm and 1480nm, and the 3dB bandwidth is between 10 nm and 100 nm;
the central wavelength of the 2-order coherent pump source is 1320 nm-1380 nm, and the 3dB bandwidth is 0.1-5 nm;
the power of the 2-order coherent pump source is higher than that of the 1-order incoherent pump source.
4. The cascaded remote optical amplification system of claim 1,
the length of the front-end bypass optical fiber of the 1 st section is equal to the length of the front-end transmission optical fiber of the 1 st section, and the length of the front-end bypass optical fiber of the 2 nd section is equal to the sum of the lengths of the front-end transmission optical fibers of the 1 st section and the 2 nd section;
the length of the 1 st section of rear end bypass optical fiber is equal to the length of the 1 st section of rear end transmission optical fiber, and the length of the 2 nd section of rear end bypass optical fiber is equal to the sum of the lengths of the 1 st section of rear end transmission optical fiber and the 2 nd section of rear end transmission optical fiber.
5. The cascade remote optical amplification system is characterized by comprising an optical emission device, 2 forward remote gain modules, a front-end composite pump source and an optical receiving device; the light emitting device is used for generating input signal light of the system;
the output end of the light emitting device is connected with the first input end of a 1 st forward remote gain module (RGU 11) through a 1 st section of front end transmission optical fiber, and the output end of the 1 st forward remote gain module (RGU 11) is connected with the first input end of a 2 nd forward remote gain module (RGU 12) through a 2 nd section of front end transmission optical fiber; the output end of the 2 nd forward remote gain module (RGU 12) is connected with the light receiving device through an intermediate transmission optical fiber;
the front-end composite pump source comprises a first output end and a second output end;
the first output end of the front end composite pump source is connected with the second input end of the 1 st forward remote gain module (RGU 11) through the 1 st section of front end bypass optical fiber; the second output end of the front end composite pump source is connected with the second input end of the 2 nd forward remote gain module (RGU 12) through the 2 nd section of front end bypass optical fiber;
the first output end of the front-end composite pump source is used for outputting at least 1-order pump light generated by the 1-order incoherent pump source;
the second output end of the front-end composite pump source is used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal optical spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal optical spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source.
6. The cascaded remote optical amplification system of claim 5,
the front-end composite pump source comprises a 1-order incoherent pump source, one or more 2-order coherent pump sources, a broadband combiner and a power beam splitter;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the front-end composite pumping source; the public end of the broadband combiner is used as a second output end of the front-end composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the front-end composite pump source;
the 1-order incoherent pumping source adopts an incoherent broadband light source; the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source.
7. The cascaded remote optical amplification system of claim 5,
the center wavelength of the 1-order incoherent pump source is between 1420nm and 1480nm, and the 3dB bandwidth is between 10 nm and 100 nm;
the central wavelength of the 2-order coherent pump source is 1320 nm-1380 nm, and the 3dB bandwidth is 0.1-5 nm;
the power of the 2-order coherent pump source is higher than that of the 1-order incoherent pump source.
8. The cascade remote optical amplification system is characterized by comprising an optical emission device, 2 backward remote gain modules, a rear-end composite pump source and an optical receiving device; the light emitting device is used for generating input signal light of the system;
the output end of the light emitting device is connected with the first input end of a 2 nd backward remote gain module (RGU 2) through an intermediate transmission optical fiber; the output end of the 2 nd backward remote gain module (RGU 2) is connected with the first input end of the 1 st backward remote gain module (RGU 1) through the 2 nd section of rear end transmission optical fiber; the output end of the 1 st backward remote gain module (RGU 1) is connected with the light receiving device through the 1 st section of rear end transmission optical fiber;
the rear end composite pump source comprises a first output end and a second output end;
the first output end of the rear-end composite pump source is connected with the second input end of the 1 st backward remote gain module (RGU 1) through the 1 st section of rear-end bypass optical fiber; the second output end of the rear end composite pump source is connected with the second input end of a 2 nd backward remote gain module (RGU 2) through a 2 nd section of rear end bypass optical fiber;
the first output end of the back-end composite pump source is used for outputting at least 1-order pump light generated by the 1-order incoherent pump source;
the second output end of the back end composite pump source is used for outputting 1-order pump light generated by the 1-order incoherent pump source and 2-order pump light generated by the 2-order coherent pump source;
the 1-order incoherent pump source and the 2-order coherent pump source have the following characteristics: the input signal optical spectrum is located at the 2 nd order raman shift of the 2 nd order coherent pump source spectrum, the input signal optical spectrum is located at the 1 st order raman shift of the 1 st order incoherent pump source spectrum, and the 1 st order incoherent pump source spectrum is located at the 1 st order raman shift of the 2 nd order coherent pump source.
9. The cascaded remote optical amplification system of claim 8, wherein,
the back end composite pump source comprises a 1-order incoherent pump source, one or more 2-order coherent pump sources, a broadband combiner and a power beam splitter;
2-order pump light output by a 2-order coherent pump source, or 2-order pump light after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the input end of the power beam splitter; one output end of the power beam splitter is connected with the other input end of the broadband wave device; the other output end of the power beam splitter is used as a first output end of the rear-end composite pumping source; the public end of the broadband combiner is used as a second output end of the rear-end composite pump source;
or 2-order pump light output by a 2-order coherent pump source, or 2-order pump light output by a plurality of 2-order coherent pump sources after being combined by a front-end combiner is connected to one input end of a broadband combiner; the output of the 1-order incoherent pump source is connected with the other input end of the broadband combiner, the public end of the broadband combiner is connected with the input end of the power beam splitter, and the two output ends of the power beam splitter are respectively used as a first output end and a second output end of the rear-end composite pump source;
the 1-order incoherent pumping source adopts an incoherent broadband light source; the 2-order coherent pump source adopts a Raman fiber laser or a semiconductor laser light source.
10. The cascaded remote optical amplification system of any one of claims 1-9,
the forward remote gain module and the backward remote gain module comprise a built-in combiner, a gain optical fiber and an isolator; the first input end of the built-in combiner is used as the first input end of the forward remote gain module or the backward remote gain module, and the second input end of the built-in combiner is used as the second input end of the forward remote gain module or the backward remote gain module; the public end of the built-in combiner is connected with one end of the gain optical fiber; the other end of the gain fiber is connected with one end of the isolator, and the other end of the isolator is used as the output end of the forward remote gain module or the backward remote gain module.
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| CN112490830A (en) * | 2020-11-16 | 2021-03-12 | 武汉光迅电子技术有限公司 | Remote pumping system for increasing distance between pumping unit and gain unit |
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