CN109742645B - High-efficiency L-band remote amplifier - Google Patents
High-efficiency L-band remote amplifier Download PDFInfo
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- CN109742645B CN109742645B CN201910213495.9A CN201910213495A CN109742645B CN 109742645 B CN109742645 B CN 109742645B CN 201910213495 A CN201910213495 A CN 201910213495A CN 109742645 B CN109742645 B CN 109742645B
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Abstract
The invention provides a high-efficiency L-band remote amplifier, which comprises a remote passive gain module group and a remote pumping unit group; in the remote passive gain module group, the signal light input end is connected with the 1 port of the first optical fiber circulator, the 2 port of the first optical fiber circulator is connected with one end of the third reflector, and the other end of the third reflector is connected with the signal end of the first combiner; the 3 port of the first optical fiber circulator is connected with a signal light output end, and the signal light output end is used for being connected with a main optical path transmission optical fiber; the reflection end of the first combiner is connected with the first reflector, the public end of the first combiner is connected with one end of the erbium-doped optical fiber, the other end of the erbium-doped optical fiber is connected with the public end of the second combiner, the signal end of the second combiner is connected with the second reflector, and the reflection end of the second combiner is connected with the pumping light input end; the remote pumping unit group is used for generating first-order Raman pumping light with a plurality of different wavelengths relative to the signal light; the invention can improve the gain efficiency of the erbium-doped fiber and avoid nonlinear lasing.
Description
Technical Field
The present invention relates to an optical amplifier, and more particularly, to an L-band remote amplifier for use in optical communication and optical transmission systems.
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.
Erbium Doped Fiber Amplifiers (EDFAs) are the most mature amplifiers. Among them, the C-band erbium-doped fiber amplifier (1527 to 1568 nm) has been widely used in communication lines. The gain of the L-band erbium-doped fiber amplifier is 1570-1610 nm. Since the working wavelength of the L-band EDFA is far away from the stimulated absorption and emission peaks of the erbium-doped fiber, a large amount of inversion particles are consumed by the spontaneous emission light amplified by the reverse C-band near the pump input end, and the amplification effect of the L-band signal light is affected.
The remote pump L-band amplifier can prolong the transmission distance of a single-span repeater-free system. The remote amplifier is arranged in the middle of the line to amplify weak signals, so that the optical signal to noise ratio of a receiving end can be improved, and the sensitivity of the receiver is further improved. The gain fiber (erbium-doped fiber) of the remote amplifier is separated from the pump light, the pump for generating the pump light needs to supply power, and the pump light is generally placed in a signal transmitting end or receiving end machine room, and the pump light sends power to the gain fiber through a section of transmission fiber; the length of the transmission fiber is too long, so that the optical power sent to the gain fiber is too small, and the gain generated in the gain fiber is small; the length of the transmission fiber is too short, and although the pump power reaching the gain fiber is relatively high, the effect of extending the distance of the unrepeatered transmission system is limited, so various methods are needed to be conceived to improve the gain of the remote amplifier on the premise of keeping the length of the transmission fiber.
Although increasing the pump light power can increase the gain of the amplifier, in the remote amplifier, for example, for an L-band remote amplifier, the pump light power exceeding the raman threshold value at a wavelength of 1480nm is not as high as possible, and raman lasing signals are easily formed, the lasing signal wavelength is in the vicinity of 1590nm, and these lasing signals interfere with the actual transmission signal (L-band, 1570 to 1610 nm), resulting in performance degradation. Experiments show that when the power of 1480nm pump light at the transmitting end exceeds 1W, spontaneous Raman scattering is caused in the pump transmission fiber, so that the system performance is seriously reduced, and the unrepeatered transmission distance is shortened.
On the one hand, it is desirable to increase the pump power into the erbium fibers to obtain a large gain, and on the other hand, in the case of insufficient pump power resources, improving the gain efficiency of the erbium fibers of the remote passive pump module is also an effective way to increase the unrepeatered transmission distance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a high-efficiency L-band remote amplifier which can improve the gain efficiency of an erbium-doped fiber, and can improve the maximum allowable pumping fiber-entering power by taking a plurality of first-order Raman pump lights with dispersed wavelengths as pump lights entering the erbium-doped fiber so as to avoid nonlinear lasing; the transmission distance of the unrepeatered system can be extended. The technical scheme adopted by the invention is as follows:
a high-efficiency L-band remote amplifier comprises a remote passive gain module group and a remote pumping unit group;
the remote passive gain module group comprises a signal light input end, a first optical fiber circulator, a first reflector, a first combiner, an erbium-doped optical fiber, a second combiner, a second reflector, a signal light output end, a pump light input end and a third reflector;
for the first optical fiber circulator, light can only be transmitted along the direction of 1 port- >2 port- >3 port of the first optical fiber circulator; the 3-port to 1-port direction is not communicated;
the signal light input end is connected with the 1 port of the first optical fiber circulator, the 2 port of the first optical fiber circulator is connected with one end of the third reflector, and the other end of the third reflector is connected with the signal end of the first combiner; the 3 port of the first optical fiber circulator is connected with a signal light output end, and the signal light output end is used for being connected with a main optical path transmission optical fiber;
the reflection end of the first combiner is connected with the first reflector, the public end of the first combiner is connected with one end of the erbium-doped optical fiber, the other end of the erbium-doped optical fiber is connected with the public end of the second combiner, the signal end of the second combiner is connected with the second reflector, and the reflection end of the second combiner is connected with the pumping light input end;
the pump light input end is connected with the output of the remote pump unit group;
the remote pumping unit group is used for generating first-order Raman pumping light with a plurality of different wavelengths relative to the signal light;
the reflection wavelength range of the first reflector corresponds to the wavelength range of the pump light entering the erbium-doped fiber from the remote pump unit group;
the third reflector has a central reflection wavelength of 1530nm to 1540nm, and reflects light within the reflection bandwidth and transmits light outside the reflection bandwidth.
Further, the second reflector comprises a second optical fiber circulator, for which light can only be transmitted along the 1 port- >2 port- >3 port direction, and the 3 port-to-1 port direction is not communicated; the 2 port of the second optical fiber circulator is connected with the signal end of the second multiplexer, and the 3 port is connected with the 1 port through a section of optical fiber.
Or alternatively, the process may be performed,
the second reflector adopts an optical fiber annular mirror, the optical fiber annular mirror comprises a 50:50 optical splitter, and two 50% output ports of the optical splitter are connected through optical fibers.
Further, the central reflection wavelength of the third reflector is 1533nm, and the reflection bandwidth is 0.2 nm-2 nm.
Further, the remote pumping unit group comprises a high-order Raman pumping laser, a first auxiliary pumping adjustment module, a pumping transmission optical fiber and a second auxiliary pumping adjustment module;
the high-order Raman pump laser is used for generating n-order Raman pump light relative to the signal light, wherein n is more than or equal to 2; the output end of the high-order Raman pump laser is connected with one end of a first auxiliary pump adjusting module, the other end of the first auxiliary pump adjusting module is connected with one end of a second auxiliary pump adjusting module through a pump transmission optical fiber, and the other end of the second auxiliary pump adjusting module is connected with the pump light input end of the remote passive gain module group;
the first auxiliary pump adjusting module and the second auxiliary pump adjusting module comprise Bragg reflection fiber gratings, the first auxiliary pump adjusting module, the pump transmission fiber and the second auxiliary pump adjusting module form a laser resonant cavity, and a plurality of first-order Raman pump lights with different wavelengths relative to the signal light are obtained through the frequency selection function of the fiber gratings.
Further, the high-order raman pump laser generates 2-order raman pump light with respect to the signal light;
the first auxiliary pump adjusting module and the second auxiliary pump adjusting module comprise at least 2 Bragg reflection fiber gratings, and the quantity of the Bragg reflection fiber gratings is the same;
each Bragg reflection fiber grating in the first auxiliary pump adjusting module and the second auxiliary pump adjusting module is a fiber grating which corresponds to the first Stokes frequency shift of 2-order Raman pump light and has different reflection wavelengths;
in the first auxiliary pump adjusting module and the second auxiliary pump adjusting module, the Bragg reflection fiber gratings are arranged in pairs according to the order of being close to the pump transmission optical fibers, and the reflection wavelengths of the Bragg reflection fiber gratings in the same pair are the same;
the Bragg reflection fiber grating in the second auxiliary pump adjusting module is a semi-transparent and semi-reflective grating.
Still further, the method further comprises the steps of,
the reflectivity of the Bragg reflection fiber bragg grating in the first auxiliary pump adjusting module is more than 99%;
the reflectivity of the Bragg reflection fiber bragg gratings in the second auxiliary pump adjustment module is less than 30%.
Or, further, the high-order raman pump laser generates 3-order raman pump light with respect to the signal light;
the first auxiliary pump adjusting module and the second auxiliary pump adjusting module comprise at least 3 Bragg reflection fiber gratings, and the number of the Bragg reflection fiber gratings is the same; wherein, 1 fiber grating corresponding to the first-order Stokes shift of 3-order Raman pump light, and at least 2 fiber gratings corresponding to the second-order Stokes shift of 3-order Raman pump light and having different reflection wavelengths;
in the first auxiliary pump adjusting module and the second auxiliary pump adjusting module, the Bragg reflection fiber gratings are arranged in pairs according to the order of being close to the pump transmission optical fibers, and the reflection wavelengths of the Bragg reflection fiber gratings in the same pair are the same;
in the first auxiliary pump adjusting module and the second auxiliary pump adjusting module, the fiber gratings corresponding to the first-order Stokes shift of the 3-order Raman pump light are positioned close to the order position of the pumping transmission fiber or away from the order position of the pumping transmission fiber relative to all fiber gratings corresponding to the second-order Stokes shift of the 3-order Raman pump light;
in the second auxiliary pump adjusting module, the fiber grating corresponding to the second Stokes shift of the 3-order Raman pump light is a semi-transparent semi-reflective grating.
Still further, the method further comprises the steps of,
the reflectivity of the Bragg reflection fiber bragg grating in the first auxiliary pump adjusting module is more than 99%;
in the second auxiliary pump adjustment module, the reflectivity of the fiber grating corresponding to the first-order Stokes shift of the 3-order Raman pump light is more than 99%, and the reflectivity of the fiber grating corresponding to the second-order Stokes shift of the 3-order Raman pump light is less than 30%.
Further, the erbium-doped fiber is an L-band erbium-doped fiber.
The invention has the advantages that:
1) The bait fiber gain is more effectively improved through the action of three reflectors in the remote passive gain module group; the first reflector reflects pump light near 1480nm and the second reflector reflects signal light to form a double-pass structure; the third reflector reflects the spontaneous radiation light near 1533nm and forms secondary pumping to the L-band signal; can fully utilize the residual pump light, the spontaneous emission light and the signal light, improve the pump light efficiency, and has the characteristics of high gain and low noise
2) The remote pumping unit group can greatly improve the maximum allowable pumping fiber entering power by utilizing the Raman frequency shift principle, avoid nonlinear laser emission, and obtain first-order Raman pump light with a plurality of scattered frequencies (wavelengths) relative to the signal light as the pump light of the erbium-doped fiber amplifier.
The high-efficiency L-band remote amplifier can greatly prolong the distance between the remote passive gain module group and a receiving end machine room, and further can greatly prolong the transmission distance of a relay-free system.
Drawings
FIG. 1 is a schematic diagram of the structural composition of the present invention.
Fig. 2 is a schematic structural view of a second reflector according to the present invention.
Fig. 3 is a schematic view of another structure of the second reflector of the present invention.
Fig. 4 is a schematic diagram of a remote pump unit set according to the present invention.
Fig. 5 is a schematic diagram of another configuration of the remote pump unit set of the present invention.
Detailed Description
The invention will be further described with reference to the following specific drawings and examples.
The invention provides a high-efficiency L-band remote amplifier (hereinafter referred to as an amplifier), which is applicable to a different fiber transmission structure, wherein a main optical path transmission optical fiber and a pumping transmission optical fiber are separated;
as shown in fig. 1, the high-efficiency L-band remote amplifier provided by the invention comprises a remote passive gain module group and a remote pumping unit group;
the remote passive gain module group comprises a signal light input end 10, a first optical fiber circulator 20, a first reflector 30, a first combiner 41, an erbium-doped optical fiber 50, a second combiner 42, a second reflector 60, a signal light output end 70, a pump light input end 80 and a third reflector 140;
the first optical fiber circulator 20 has the characteristic of unidirectional transmission, and light can only be transmitted along the direction of 1 port- >2 port- >3 port; the 3-port to 1-port direction is not communicated;
the signal light input end 10 is connected with the 1 port of the first optical fiber circulator 20, the 2 port of the first optical fiber circulator 20 is connected with one end of the third reflector 140, and the other end of the third reflector 140 is connected with the signal end of the first combiner 41; the 3 port of the first fiber circulator 20 is connected with a signal light output end 70, and the signal light output end 70 is used for being connected with a main optical path transmission fiber 90;
the reflection end of the first combiner 41 is connected with the first reflector 30, the public end of the first combiner 41 is connected with one end of the erbium-doped fiber 50, the other end of the erbium-doped fiber 50 is connected with the public end of the second combiner 42, the signal end of the second combiner 42 is connected with the second reflector 60, and the reflection end of the second combiner 42 is connected with the pump light input end 80;
the pump light input end 80 is connected with the output of the remote pump unit group;
for the signal light of the L wave band needing to be amplified, the wavelength is 1570 nm-1610 nm;
the remote pumping unit group is used for generating first-order Raman pumping light with respect to signal light of a plurality of different wavelengths, for example, the first-order Raman pumping light generated and output by the remote pumping unit group comprises two wavelengths of 1480nm and 1470nm or three wavelengths of 1465nm, 1475nm and 1485nm; the wavelength range of the first-order Raman pump light can be 1460 nm-1490 nm;
the reflection wavelength range of the first reflector 30 corresponds to the wavelength range of the pump light entering the erbium doped fiber 50 from the remote pump cell group; for example, in this example, the reflection wavelength range of the first reflector 30 is 1460nm to 1490nm; the first reflector 30 may employ a reflective fiber grating; the first reflector 30 is used for reflecting the residual pump light back to the erbium-doped fiber 50, so as to improve the pump light efficiency;
the third reflector 140 has a central reflection wavelength of 1530nm to 1540nm, typically a central reflection wavelength of 1533nm and a reflection bandwidth of 0.2nm to 2nm, and reflects light within the reflection bandwidth of the central reflection wavelength and transmits light outside the reflection bandwidth; the third reflector 140 may employ a reflective fiber grating; the function is to fully utilize the spontaneous emission light of the C wave band, and the spontaneous emission light is fed back to the erbium-doped fiber 50 by utilizing the fiber bragg grating to form secondary pumping;
the signal light is amplified in the erbium-doped fiber 50 by first-order raman pump light of several different wavelengths from the remote pump unit group; then enters a long-distance main optical path transmission optical fiber 90 through the 3 port of the first optical fiber circulator 20 and the signal light output end 70;
the second reflector 60 may employ a fiber optic circulator or a fiber optic annular mirror; the second reflector 60 is used for returning all the signal light from the second combiner 42 to the erbium-doped fiber, so that the gain of the erbium fiber is enhanced; the combined action of the three reflectors can more effectively improve the pumping efficiency and increase the erbium fiber gain. For example, under the condition of the same pumping power, the transmission signal can obtain larger gain and lower noise, and the erbium fiber cost can be saved;
an example of the second reflector 60 is shown in fig. 2, and includes a second optical fiber circulator 60a, where the second optical fiber circulator 60a has a unidirectional transmission characteristic, and light can only transmit along a 1 port- >2 port- >3 port direction thereof; the 3-port to 1-port direction is not communicated; the 2 port of the second optical fiber circulator 60a is connected with the signal end of the second combiner 42, and the 3 port is connected with the 1 port through a section of optical fiber; the specific process comprises the following steps: the signal light is output from the signal end of the second combiner 42, enters the 2 port of the second optical fiber circulator 60a, is output from the 3 port, and is directly connected with the 1 port, so that the signal light enters the second optical fiber circulator 60a from the 1 port, is output from the 2 port of the second optical fiber circulator 60a, and returns to the second combiner 42;
as another example of the second reflector 60, as shown in fig. 3, the second reflector 60 is a fiber optic annular mirror, and the fiber optic annular mirror includes a 50:50 optical splitter 60b, and two 50% output ports of the optical splitter 60b are connected by optical fiber fusion; the fiber loop mirror can theoretically reflect 100% of the signal light from the second combiner 42 back to the erbium-doped fiber, and forms a double-pass structure for the amplified signal, so that the signal is amplified again; the double-pass structure not only can improve the signal gain, but also can reduce the length of erbium fibers and reduce the requirement on pumping power;
the erbium-doped fiber 50 is an L-band erbium-doped fiber, the length is 7 meters, and the absorption coefficient at 1530nm is 25-30 dB/m;
the remote pump unit group in the invention forms a plurality of first-order Raman pump lights with different wavelengths relative to the signal light while realizing the transmission of the pump power, the power of each wavelength is only a plurality of mW, and the total power does not exceed a Raman threshold, so that the problem that the conventional remote amplifier generates Stokes shift on 1480nm pump light in a transmission optical fiber to form 1590nm lasing signals and causes interference on amplified L-band signal light can be avoided;
the high-efficiency L-band remote amplifier provided by the invention is pumped by a different-fiber pumping mode, pump light does not transmit pump power to a remote passive gain module group through a main optical path transmission optical fiber, and pump power is transmitted to the remote passive gain module group through a section of pump transmission optical fiber which is the same as or similar to the distance of the main optical path transmission optical fiber;
in fig. 1, the remote pump unit group includes a high-order raman pump laser 120, a first auxiliary pump adjustment module 110, a pump delivery fiber 130, a second auxiliary pump adjustment module 100;
the high-order Raman pump laser 120 is used for generating n-order Raman pump light relative to the signal light, wherein n is more than or equal to 2; the output end of the high-order Raman pump laser 120 is connected with one end of a first auxiliary pump adjusting module 110, the other end of the first auxiliary pump adjusting module 110 is connected with one end of a second auxiliary pump adjusting module 100 through a pump transmission optical fiber 130, and the other end of the second auxiliary pump adjusting module 100 is connected with the pump light input end 80 of the remote passive gain module group;
the first auxiliary pump adjusting module 110 and the second auxiliary pump adjusting module 100 comprise Bragg reflection fiber gratings, the first auxiliary pump adjusting module 110, the pump transmission fiber 130 and the second auxiliary pump adjusting module 100 form a laser resonant cavity, and a plurality of first-order Raman pump lights with different wavelengths relative to signal lights are obtained through the frequency selection function of the fiber gratings;
in this example, the first-order raman pump light is obtained by raman shift of the high-order raman pump light of the high-order raman pump laser 120;
a first embodiment of a remote pump unit group is shown in fig. 4;
the high-order raman pump laser 120 generates 2-order raman pump light having a wavelength of 1390nm with respect to the signal light;
the first auxiliary pump adjusting module 110 and the second auxiliary pump adjusting module 100 each comprise at least 2 bragg reflection fiber gratings, and the number of the bragg reflection fiber gratings is the same;
each bragg reflection fiber grating in the first auxiliary pump adjustment module 110 and the second auxiliary pump adjustment module 100 is a fiber grating corresponding to the first stokes shift of the 2-order raman pump light and having different reflection wavelengths;
in the first auxiliary pump adjustment module 110 and the second auxiliary pump adjustment module 100, the bragg reflection fiber gratings are arranged in pairs in the order of approaching the pump transmission fiber 130, and the reflection wavelengths of the bragg reflection fiber gratings in the same pair are the same; for example, the bragg reflection fiber gratings FBG1 and FBG1 'are paired, the reflection wavelength is 1470nm, the bragg reflection fiber gratings FBG2 and FBG2' are paired, and the reflection wavelength is 1480nm;
in fig. 4, the reflection wavelengths of the two bragg reflection fiber gratings FBG2 and FBG1 in the first auxiliary pump adjusting module 110 are 1480nm and 1470nm respectively, the reflectivity is greater than 99%, and the reflection bandwidth is 0.5-2 nm; the connection mode between the fiber gratings is a fusion welding mode, and the intrinsic loss of each fiber grating is less than 0.5dB;
the reflection wavelengths of the two bragg reflection fiber gratings FBG2', FBG1' in the second auxiliary pump adjustment module 100 are 1480nm and 1470nm respectively, the bragg reflection fiber gratings in the second auxiliary pump adjustment module 100 are both semi-transparent and semi-reflective gratings, and the reflectivity is generally less than 30%;
the 1390nm wavelength 2-order raman pump light generates primary stokes light in the pump delivery fiber 130 and is reflected by the fiber bragg grating within the auxiliary pump adjustment module to form an enhanced laser signal and output; specifically: the two auxiliary pump tuning modules 110, 100 and the pump delivery fiber 130 form a laser resonator with a wavelength of 1390nm (l 2 rd ) When the pump light of the pump light enters the resonant cavity and reaches the threshold value of the laser resonant cavity, stokes frequency shift occurs, the pump light is converted into low-frequency long-wave photons, and photons of 1470 and 1480nm are selected from gain spectrums due to the frequency selecting effect of the fiber bragg grating, and the intensity in the resonant cavity is continuously enhanced; the reflectivity of the second auxiliary pump adjusting module 100 is designed to be 15%, and 85% of laser light is finally output from the laser resonant cavity to enter the remote passive gain module group;
if the first auxiliary pump tuning module 110 and the second auxiliary pump tuning module 100 each include 3 bragg reflection fiber gratings, the reflection wavelengths may be 1465nm, 1475nm, 1485nm;
a second embodiment of a remote pump unit group is shown in fig. 5;
the high-order raman pump laser 120 generates 3-order raman pump light having a wavelength of 1300nm with respect to the signal light;
the first auxiliary pump adjusting module 110 and the second auxiliary pump adjusting module 100 each comprise at least 3 bragg reflection fiber gratings, and the number of the bragg reflection fiber gratings is the same; wherein, 1 fiber grating corresponding to the first-order stokes shift of the 3-order raman pump light, such as FBG0 and FBG0' in fig. 5, and at least 2 fiber gratings corresponding to the second-order stokes shift of the 3-order raman pump light and having different reflection wavelengths, such as FBG1, FBG2 and FBG1' and FBG2' in fig. 5;
in the first auxiliary pump adjustment module 110 and the second auxiliary pump adjustment module 100, the bragg reflection fiber gratings are arranged in pairs in the order of approaching the pump transmission fiber 130, and the reflection wavelengths of the bragg reflection fiber gratings in the same pair are the same; for example, the bragg reflection fiber gratings FBG0 and FBG0' are paired, the reflection wavelength is 1390nm, the bragg reflection fiber gratings FBG1 and FBG1' are paired, the reflection wavelength is 1470nm, the bragg reflection fiber gratings FBG2 and FBG2' are paired, and the reflection wavelength is 1480nm;
in the first auxiliary pump adjustment module 110 and the second auxiliary pump adjustment module 100, the fiber gratings (such as FBG 0) corresponding to the first stokes shift of the 3-order raman pump light are located near the order of the pump transmission fiber 130 or away from the order of the pump transmission fiber 130, relative to all the fiber gratings (such as FBG1 and FBG 2) corresponding to the second stokes shift of the 3-order raman pump light; for example, in the first auxiliary pump adjustment module 110, the FBG0 is located at the side close to the pump transmission fiber 130 compared to the FBG1 and the FBG2, or the FBG0 is located at the left side (the side away from the pump transmission fiber 130) of the two fiber gratings FBG1 and FBG 2;
the three Bragg reflection fiber gratings FBG2, FBG1 and FBG0 in the first auxiliary pump adjusting module 110 respectively have reflection wavelengths of 1480nm, 1470nm and 1390nm, the reflectivities are all more than 99%, and the reflection bandwidths are 0.5-2 nm; the connection mode between the fiber gratings is a fusion welding mode, and the intrinsic loss of each fiber grating is less than 0.5dB;
the three bragg reflection fiber gratings FBG2', FBG1', FBG0 'in the second auxiliary pump adjustment module 100 have reflection wavelengths of 1480nm, 1470nm, 1390nm, respectively, the reflectivity of the fiber grating FBG0' corresponding to the first stokes shift of the 3-order raman pump light is greater than 99%, and the reflectivity of the fiber gratings FBG1 and FBG2 corresponding to the second stokes shift of the 3-order raman pump light are both semi-transparent and semi-reflective gratings, respectively, smaller than 30%;
the remote pumping unit group generates first-order Raman pumping light relative to the signal light by utilizing the principle of Raman scattering frequency shift; the 3-order raman pump light (1300 nm) is first subjected to a first-order stokes shift (1-order raman shift) in the pump transmission fiber 130, and is reflected by the 1390nm fiber grating in the auxiliary pump adjustment module to FBG0, FBG0', when the first-order raman shift light (1390 nm) is strong enough to exceed a threshold value, the raman shift (2-order raman shift with respect to the pump light) is further generated, and new shift lights 1470nm and 1480nm are generated due to the frequency selection effect of the fiber grating.
Specifically: the two auxiliary pump tuning modules 110, 100 and the pump delivery fiber 130 form a laser resonator with a wavelength of 1300nm (l 3 rd ) When the pump light enters the resonant cavity and reaches the threshold value of the laser resonant cavity, the first-order Stokes frequency shift occurs, the pump light is converted into low-frequency long-wave photons (1390 nm), the photons of 1390nm are continuously enhanced due to the frequency selection effect of the fiber grating, when the pump light is enhanced to a certain extent and exceeds the threshold value, the Raman frequency shift occurs to the light of 1390nm, the light of 1470nm and 1480nm is selected due to the frequency selection effect of the fiber grating, and the intensity in the resonant cavity is continuously enhanced. The light reflectivity of 1390nm in the second auxiliary pump tuning module 100 is designed to be greater than 99% in order to form 1390nm laser light within the resonant cavity; the light reflectances of 1470nm and 1480nm are designed to be less than 15 to 30%. Most of the 1470nm and 1480nm wavelength lasers will eventually be output from the laser resonator and into the remote passive gain module set.
If the first auxiliary pump tuning module 110 and the second auxiliary pump tuning module 100 each include 4 bragg reflection fiber gratings, the reflection wavelengths may be 1390nm, 1465nm, 1475nm, 1485nm;
finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (10)
1. The high-efficiency L-band remote amplifier is characterized by comprising a remote passive gain module group and a remote pumping unit group;
the remote passive gain module group comprises a signal light input end (10), a first optical fiber circulator (20), a first reflector (30), a first combiner (41), an erbium-doped optical fiber (50), a second combiner (42), a second reflector (60), a signal light output end (70), a pumping light input end (80) and a third reflector (140);
for the first fiber circulator (20), light can only be transmitted along the direction of 1 port- >2 port- >3 port of the first fiber circulator; the 3-port to 1-port direction is not communicated;
the signal light input end (10) is connected with the 1 port of the first optical fiber circulator (20), the 2 port of the first optical fiber circulator (20) is connected with one end of the third reflector (140), and the other end of the third reflector (140) is connected with the signal end of the first combiner (41); the 3 port of the first optical fiber circulator (20) is connected with a signal light output end (70), and the signal light output end (70) is used for being connected with a main optical path transmission optical fiber (90);
the reflection end of the first combiner (41) is connected with the first reflector (30), the public end of the first combiner (41) is connected with one end of the erbium-doped fiber (50), the other end of the erbium-doped fiber (50) is connected with the public end of the second combiner (42), the signal end of the second combiner (42) is connected with the second reflector (60), and the reflection end of the second combiner (42) is connected with the pumping light input end (80);
the pump light input end (80) is connected with the output of the remote pump unit group;
the remote pumping unit group is used for generating first-order Raman pumping light with a plurality of different wavelengths relative to the signal light;
the reflection wavelength range of the first reflector (30) corresponds to the pump wavelength range entering the erbium doped fiber (50) from the remote pump unit group;
the third reflector (140) has a central reflection wavelength of 1530nm to 1540nm, and reflects light within the reflection bandwidth and transmits light outside the reflection bandwidth.
2. The efficient L-band remote amplifier of claim 1,
the second reflector (60) comprises a second optical fiber circulator (60 a), and for the second optical fiber circulator (60 a), light can only be transmitted along the 1 port- >2 port- >3 port direction, and the 3 port-to-1 port direction is not communicated; the 2 port of the second optical fiber circulator (60 a) is connected with the signal end of the second multiplexer (42), and the 3 port is connected with the 1 port through a section of optical fiber.
3. The efficient L-band remote amplifier of claim 1,
the second reflector (60) adopts a fiber optic annular mirror, the fiber optic annular mirror comprises a 50:50 optical splitter (60 b), and two 50% output ports of the optical splitter (60 b) are connected through optical fibers.
4. The efficient L-band remote amplifier of claim 1,
the central reflection wavelength of the third reflector (140) is 1533nm, and the reflection bandwidth is 0.2 nm-2 nm.
5. The efficient L-band remote amplifier of claim 1,
the remote pump unit group comprises a high-order Raman pump laser (120), a first auxiliary pump adjusting module (110), a pump transmission optical fiber (130) and a second auxiliary pump adjusting module (100);
the high-order Raman pump laser (120) is used for generating n-order Raman pump light relative to the signal light, wherein n is more than or equal to 2; the output end of the high-order Raman pump laser (120) is connected with one end of a first auxiliary pump adjusting module (110), the other end of the first auxiliary pump adjusting module (110) is connected with one end of a second auxiliary pump adjusting module (100) through a pump transmission optical fiber (130), and the other end of the second auxiliary pump adjusting module (100) is connected with a pump light input end (80) of a remote passive gain module group;
the first auxiliary pump adjusting module (110) and the second auxiliary pump adjusting module (100) comprise Bragg reflection fiber gratings, the first auxiliary pump adjusting module (110), the pump transmission fiber (130) and the second auxiliary pump adjusting module (100) form a laser resonant cavity, and a plurality of first-order Raman pump lights with different wavelengths relative to the signal light are obtained through the frequency selection function of the fiber gratings.
6. A high efficiency L-band remote amplifier as set out in claim 5,
a higher order raman pump laser (120) generating 2 nd order raman pump light relative to the signal light;
the first auxiliary pump adjusting module (110) and the second auxiliary pump adjusting module (100) comprise at least 2 Bragg reflection fiber gratings, and the number of the Bragg reflection fiber gratings is the same;
each Bragg reflection fiber grating in the first auxiliary pump adjusting module (110) and the second auxiliary pump adjusting module (100) is a fiber grating which corresponds to one-stage Stokes shift of 2-order Raman pump light and has different reflection wavelengths;
in the first auxiliary pump adjusting module (110) and the second auxiliary pump adjusting module (100), the Bragg reflection fiber gratings are arranged in pairs according to the order of approaching to the pump transmission fiber (130), and the reflection wavelengths of the Bragg reflection fiber gratings in the same pair are the same;
the Bragg reflection fiber grating in the second auxiliary pump adjustment module (100) is a semi-transparent and semi-reflective grating.
7. A high efficiency L-band remote amplifier as set out in claim 6,
the reflectivity of the Bragg reflection fiber bragg gratings in the first auxiliary pump adjusting module (110) is greater than 99%;
the bragg-reflection fiber gratings in the second auxiliary pump adjustment module (100) each have a reflectivity of less than 30%.
8. A high efficiency L-band remote amplifier as set out in claim 5,
the high-order raman pump laser (120) generates 3-order raman pump light relative to the signal light;
the first auxiliary pump adjusting module (110) and the second auxiliary pump adjusting module (100) comprise at least 3 Bragg reflection fiber gratings, and the number of the Bragg reflection fiber gratings is the same; wherein, 1 fiber grating corresponding to the first-order Stokes shift of 3-order Raman pump light, and at least 2 fiber gratings corresponding to the second-order Stokes shift of 3-order Raman pump light and having different reflection wavelengths;
in the first auxiliary pump adjusting module (110) and the second auxiliary pump adjusting module (100), the Bragg reflection fiber gratings are arranged in pairs according to the order of approaching to the pump transmission fiber (130), and the reflection wavelengths of the Bragg reflection fiber gratings in the same pair are the same;
in the first auxiliary pump adjustment module (110) and the second auxiliary pump adjustment module (100), the fiber gratings corresponding to the first-order stokes shift of the 3-order raman pump light are positioned close to the order position of the pump transmission fiber (130) or away from the order position of the pump transmission fiber (130) relative to all fiber gratings corresponding to the second-order stokes shift of the 3-order raman pump light;
in the second auxiliary pump adjustment module (100), the fiber grating corresponding to the second-order Stokes shift of the 3-order Raman pump light is a semi-transparent semi-reflective grating.
9. A high efficiency L-band remote amplifier as set out in claim 8,
the reflectivity of the Bragg reflection fiber bragg gratings in the first auxiliary pump adjusting module (110) is greater than 99%;
in the second auxiliary pump adjustment module (100), the reflectivity of the fiber grating corresponding to the first-order Stokes shift of the 3-order Raman pump light is more than 99%, and the reflectivity of the fiber grating corresponding to the second-order Stokes shift of the 3-order Raman pump light is less than 30%.
10. The efficient L-band remote amplifier of claim 1,
the erbium-doped fiber (50) is an L-band erbium-doped fiber.
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| CN111257274B (en) * | 2019-12-09 | 2023-09-19 | 长春理工大学 | Blood alcohol testing device based on 1.7 mu m wave band dual-wavelength laser light source |
| CN111490826B (en) * | 2020-04-10 | 2021-11-16 | 武汉光迅科技股份有限公司 | Remote pump amplifier and optical communication system |
| 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 |
| CN114744480B (en) * | 2021-01-07 | 2024-05-28 | 中国石油天然气集团有限公司 | Light distribution type amplifying structure |
| CN112953640B (en) * | 2021-01-18 | 2022-10-14 | 中国南方电网有限责任公司超高压输电公司 | Cascade remote pump amplification system, remote gain unit and signal light amplification method |
| CN115940991B (en) * | 2023-03-01 | 2023-06-13 | 中国电子科技集团公司第十研究所 | High-isolation L-band receiving and transmitting passive annular component and working method thereof |
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