CN221283194U - Erbium-doped fiber amplifier supporting LP-band - Google Patents
Erbium-doped fiber amplifier supporting LP-band Download PDFInfo
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- CN221283194U CN221283194U CN202322854833.1U CN202322854833U CN221283194U CN 221283194 U CN221283194 U CN 221283194U CN 202322854833 U CN202322854833 U CN 202322854833U CN 221283194 U CN221283194 U CN 221283194U
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- 239000000835 fiber Substances 0.000 title claims abstract description 177
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 239000013307 optical fiber Substances 0.000 claims abstract description 39
- 230000005540 biological transmission Effects 0.000 claims abstract description 9
- 229910052691 Erbium Inorganic materials 0.000 claims description 39
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 39
- 230000003044 adaptive effect Effects 0.000 claims description 27
- 238000005086 pumping Methods 0.000 claims description 17
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- 238000003199 nucleic acid amplification method Methods 0.000 description 9
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- 238000010168 coupling process Methods 0.000 description 1
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Abstract
The utility model relates to an erbium-doped fiber amplifier supporting LP-band. The erbium-doped fiber amplifier comprises an erbium-doped fiber amplifying main body part, an input signal port and an output signal port, wherein the erbium-doped fiber amplifying main body part at least comprises four stages of erbium-doped fiber units, and each stage of erbium-doped fiber unit comprises an erbium-doped fiber; according to the transmission path of the LP-band optical signal, the four stages of erbium-doped fiber units in the erbium-doped fiber amplifying main body part are a first stage erbium-doped fiber unit, a second stage erbium-doped fiber unit, a third stage erbium-doped fiber unit and a fourth stage erbium-doped fiber unit in sequence. The utility model can reduce the noise during the transmission of the LP-band and improve the performance of the erbium-doped optical fiber amplifier.
Description
Technical Field
The utility model relates to an erbium-doped fiber amplifier, in particular to an erbium-doped fiber amplifier supporting LP-band.
Background
In order to fully exploit the upper limit of the communication bandwidth, lower laying cost of wavelength division multiplexing and higher transmission capacity of the optical communication network, the optical communication network becomes the preferred scheme and research hotspot in the field of optical fiber communication, wherein the optical fiber amplifier (EDFA) is included, but the wider wavelength bandwidth puts higher demands on other devices of the system.
For the erbium-doped fiber amplifier working in C-band (1520 nm-1560 nm), the application range is saturated, the application requirement cannot be met, the long-band LP-band (1575 nm-1626.5 nm) can not only effectively increase the communication bandwidth, but also can effectively avoid the performance attenuation caused by FWM effect because the long-band can use more dispersion shift fiber, and the wide attention of people is gradually drawn.
However, compared with the EDFA operating in C-band, the gain effect of the EDFA of LP-band is not ideal, the noise coefficient is not good, and the practical application requirement is difficult to meet.
Disclosure of Invention
The utility model aims to overcome the defects in the prior art and provide an erbium-doped fiber amplifier supporting LP-band, which can reduce noise during LP-band transmission and improve the performance of the erbium-doped fiber amplifier.
According to the technical proposal provided by the utility model, the erbium-doped fiber amplifier supporting the LP-band comprises an erbium-doped fiber amplifying main body part, an input signal port for loading the LP-band optical signal to the erbium-doped fiber amplifying main body part and an output signal port for outputting the LP-band optical signal after gain amplification by the erbium-doped fiber amplifying main body part,
The erbium-doped fiber amplifying main body part at least comprises four stages of erbium-doped fiber units, and each stage of erbium-doped fiber unit comprises an erbium-doped fiber;
According to the transmission path of the LP-band optical signal, the four stages of erbium-doped fiber units in the erbium-doped fiber amplifying main body part are a first stage erbium-doped fiber unit, a second stage erbium-doped fiber unit, a third stage erbium-doped fiber unit and a fourth stage erbium-doped fiber unit in sequence,
The first-stage erbium-doped optical fiber unit is connected with the input signal port, the fourth-stage erbium-doped optical fiber unit is connected with the output signal port, and the first-stage erbium-doped optical fiber unit, the second-stage erbium-doped optical fiber unit, the third-stage erbium-doped optical fiber unit and the fourth-stage erbium-doped optical fiber unit are sequentially and adaptively connected in series;
the LP-band optical signal loaded by the input signal port is amplified by the first stage erbium-doped optical fiber unit, the second stage erbium-doped optical fiber unit, the third stage erbium-doped optical fiber unit and the fourth stage erbium-doped optical fiber unit in turn, and is output by the output signal port.
The first-stage erbium-doped optical fiber unit comprises a first optical splitter which is connected with an input signal port in an adaptive manner, and the first optical splitter is connected with a first photoelectric detector and a first isolator in an adaptive manner;
the output end of the first isolator is connected with the 1600nm connecting end of the first wavelength division multiplexer, and the 980nm connecting end of the first wavelength division multiplexer is connected with the first pumping source in an adaptive manner;
the common end of the first wavelength division multiplexer is connected with the first IGFF units in an adaptive manner through the first section of erbium-doped fiber, and is connected with the second stage of erbium-doped fiber units in an adaptive manner through the first IGFF units.
The first isolator is a two-stage isolator;
The light splitting proportion of the first light splitter is 5/95, wherein 95% light splitting ports of the first light splitter are connected with the input end of the first isolator, and 5% light splitting ports of the first light splitter are connected with the first photoelectric detector.
The second stage erbium doped fiber unit includes a second wavelength division multiplexer, wherein,
The input end of the second wavelength division multiplexer is connected with the output end of the first IGFF units, the 980nm connecting end of the second wavelength division multiplexer is connected with the second pumping source, the public end of the second wavelength division multiplexer is connected with one end of the second section of erbium-doped fiber, and the other end of the second section of erbium-doped fiber is connected with the second IGFF units in an adaptive mode.
The third stage erbium doped fiber unit comprises a third optical splitter for adaptively connecting with the second IGFF units, wherein,
The third optical splitter is also connected with the variable attenuator and the second photoelectric detector in an adapting way;
The variable attenuator is connected with the input end of the fourth optical splitter, the fourth optical splitter is connected with the fourth wavelength division multiplexer and the third photoelectric detector in an adaptive manner, and the 980nm connecting end of the fourth wavelength division multiplexer is connected with the fourth pumping source;
the public end of the fourth wavelength division multiplexer is connected with one end of the third section of erbium-doped fiber, and the other end of the third section of erbium-doped fiber is connected with the third IGFF unit in an adaptive mode.
And further comprises a gain enhancement unit, wherein,
The gain enhancement unit comprises a third wavelength division multiplexer arranged in the second-stage erbium-doped optical fiber unit, a fifth wavelength division multiplexer arranged in the third-stage erbium-doped optical fiber unit and a second optical splitter which is adaptively connected with the third wavelength division multiplexer and the fifth wavelength division multiplexer;
The other end of the second section of erbium-doped fiber is connected with the common end of a third wavelength division multiplexer, and the 1600nm connecting end of the third wavelength division multiplexer is connected with a second IGFF unit in an adaptive manner and is connected with a third-stage erbium-doped fiber unit in an adaptive manner through a second IGFF unit;
The other end of the third section of erbium-doped fiber is connected with the common end of a fifth wavelength division multiplexer, and the 1600nm connecting end of the fifth wavelength division multiplexer is connected with a third IGFF unit and is adaptively connected with a fourth-stage erbium-doped fiber unit through the third IGFF unit;
The second beam splitter is connected with a third pump source;
The light splitting ratio of the second light splitter is 49/51, wherein the 51% light splitting end of the second light splitter is connected with the 980nm connecting end of the third wavelength division multiplexer, and the 49% light splitting end of the second light splitter is connected with the 980nm connecting end of the fifth wavelength division multiplexer.
The light splitting proportion of the third light splitter is 1/99, wherein 99% of the light splitting ends of the third light splitter are connected with the variable attenuator, and 1% of the light splitting ends of the third light splitter are connected with the second photoelectric detector;
The light splitting proportion of the fourth light splitter is 1/99, wherein 99% of the light splitting ends of the fourth light splitter are connected with the 1600nm connecting end of the fourth wavelength division multiplexer, and 1% of the light splitting ends of the fourth light splitter are connected with the third photoelectric detector.
The fourth stage erbium-doped fiber unit includes a sixth wavelength division multiplexer for adaptively connecting the third IGFF units, wherein,
The 1600nm connecting end of the sixth wavelength division multiplexer is connected with the third IGFF units, the 980nm connecting end of the sixth wavelength division multiplexer is connected with the fifth pumping source, and the public end of the sixth wavelength division multiplexer is connected with one end of the fourth section of erbium-doped fiber;
The other end of the fourth section of erbium-doped fiber is connected with the public end of the seventh wavelength division multiplexer, the 1600nm connecting end of the seventh wavelength division multiplexer is connected with the second isolator, and the 980nm connecting end of the seventh wavelength division multiplexer is connected with the sixth pumping source;
the second isolator is adapted to be connected to the output signal port.
The second isolator is connected with the output signal port in a matching way through a fifth optical splitter, wherein,
The light splitting ratio of the fifth light splitter is 1/99, wherein 99% light splitting end of the fifth light splitter is connected with the output signal port, and 1% light splitting end of the fifth light splitter is connected with the fourth photoelectric detector.
The center wavelength of pump light generated by the first pump source, the second pump source, the third pump source, the fourth pump source, the fifth pump source and the sixth pump source is 980nm;
the power of the fourth pumping source and the sixth pumping source is 775mW;
The power of the first pump source, the second pump source, the third pump source and the fifth pump source is 680mW.
The utility model has the advantages that: the erbium-doped fiber amplifying main body part at least comprises four stages of erbium-doped fiber units, and each erbium-doped fiber unit comprises one erbium-doped fiber, so that the effective amplification of the LP-band optical signal gain is realized by only relying on one gain fiber, namely the erbium-doped fiber; when the four-stage erbium-doped fiber unit forms the erbium-doped fiber amplifying main body part, the amplifying gain of the LP-band optical signal is overlapped, the problem that the gain of the traditional erbium-doped fiber amplifier to the LP-band optical signal is lower is solved, the noise during the transmission of the LP-band can be reduced, the performance of the erbium-doped fiber amplifier is improved, and the application bandwidth of the EDFA can be effectively expanded.
Drawings
Fig. 1 is a schematic diagram of an erbium doped fiber amplifier according to an embodiment of the present utility model.
Reference numerals illustrate: 1-input signal port, 2-first splitter, 3-first isolator, 4-first wavelength division multiplexer, 5-first stage erbium doped fiber, 6-first IGFF unit, 7-second wavelength division multiplexer, 8-second stage erbium doped fiber, 9-third wavelength division multiplexer, 10-second IGFF unit, 11-first photodetector, 12-first pump source, 13-second pump source, 14-third pump source, 15-second splitter, 16-third splitter, 17-variable attenuator, 18-fourth splitter, 19-fourth wavelength division multiplexer, 20-third stage erbium doped fiber, 21-fifth wavelength division multiplexer, 22-third IGFF unit, 23-second photodetector, 24-third photodetector, 25-fourth pump source, 26-sixth wavelength division multiplexer, 27-fourth stage erbium doped fiber, 28-seventh wavelength division multiplexer, 29-fifth pump source, 31-fifth pump source, 32-sixth pump source, and 32-fifth pump port.
Detailed Description
The utility model will be further described with reference to the following specific drawings and examples.
In order to reduce noise during transmission of LP-band and improve performance of the erbium doped fiber amplifier, in one embodiment of the present utility model, for an erbium doped fiber amplifier supporting LP-band, the erbium doped fiber amplifier includes an erbium doped fiber amplifying body part, an input signal port 1 for loading an LP-band optical signal into the erbium doped fiber amplifying body part, and an output signal port 31 for outputting an LP-band optical signal gain-amplified by the erbium doped fiber amplifying body part, wherein,
The erbium-doped fiber amplifying main body part at least comprises four stages of erbium-doped fiber units, and each stage of erbium-doped fiber unit comprises an erbium-doped fiber;
According to the transmission path of the LP-band optical signal, the four stages of erbium-doped fiber units in the erbium-doped fiber amplifying main body part are a first stage erbium-doped fiber unit, a second stage erbium-doped fiber unit, a third stage erbium-doped fiber unit and a fourth stage erbium-doped fiber unit in sequence,
The first-stage erbium-doped fiber unit is connected with the input signal port 1, the fourth-stage erbium-doped fiber unit is connected with the output signal port 31, and the first-stage erbium-doped fiber unit, the second-stage erbium-doped fiber unit, the third-stage erbium-doped fiber unit and the fourth-stage erbium-doped fiber unit are sequentially and adaptively connected in series;
The LP-band optical signal loaded through the input signal port 1 is sequentially gain-amplified by the first-stage erbium-doped optical fiber unit, the second-stage erbium-doped optical fiber unit, the third-stage erbium-doped optical fiber unit and the fourth-stage erbium-doped optical fiber unit, and is output through the output signal port 31.
An embodiment of an erbium doped fiber amplifier supporting LP-band is shown in fig. 1, where the input signal port 1 and the output signal port 31 are used as input and output ends of the whole erbium doped fiber amplifier, where the input signal port 1 is adaptively connected through the output signal port 31 of the erbium doped fiber amplifying body, that is, the input signal port 1 is formed, and the erbium doped fiber amplifying body and the output signal port 31 cooperate to form the erbium doped fiber amplifier.
In order to reduce noise and improve performance, in one embodiment of the present utility model, the erbium-doped fiber amplifying body portion includes at least four stages of erbium-doped fiber units, and each erbium-doped fiber unit includes one erbium-doped fiber therein, so that effective amplification of the LP-band optical signal gain is achieved by only one gain fiber, i.e., the erbium-doped fiber. In addition, when the four-stage erbium-doped fiber unit forms the erbium-doped fiber amplifying main body part, the amplifying gain of the LP-band optical signal is overlapped, the problem that the gain of the traditional erbium-doped fiber amplifier to the LP-band optical signal is lower is solved, and the application bandwidth of the EDFA is effectively expanded.
In fig. 1, four stages of erbium-doped fiber units are sequentially connected in an adaptive manner, an LP-band optical signal enters an erbium-doped fiber amplifying main body portion through an input signal port 1, and sequentially passes through a first stage erbium-doped fiber unit, a second stage erbium-doped fiber unit, a third stage erbium-doped fiber unit and a fourth stage erbium-doped fiber unit to be subjected to gain amplification, and is output through an output signal port 31. When the erbium-doped fiber amplification main body portion includes more stages of erbium-doped fiber units, reference is made to the description herein. The case where the erbium-doped fiber amplification main body portion includes four stages of erbium-doped fiber units will be specifically described with reference to fig. 1.
In one embodiment of the present utility model, the first stage erbium doped fiber unit includes a first optical splitter 2 adaptively connected to the input signal port 1, where the first optical splitter 2 is adaptively connected to the first photodetector 11 and the first isolator 3;
the output end of the first isolator 3 is connected with the 1600nm connecting end of the first wavelength division multiplexer 4, and the 980nm connecting end of the first wavelength division multiplexer 4 is connected with the first pump source 12 in an adaptive manner;
the common end of the first wavelength division multiplexer 4 is connected to the first IGFF (Isolator + GAIN FLATTENING FILTER) unit 6 in an adaptive manner through the first erbium-doped fiber section 5, and to the second-stage erbium-doped fiber unit in an adaptive manner through the first IGFF unit 6.
In fig. 1, the first separator 3 is a two-stage separator;
The light splitting ratio of the first light splitter 2 is 5/95, wherein 95% of light splitting ports of the first light splitter 2 are connected with the input end of the first isolator 3, and 5% of light splitting ports of the first light splitter 2 are connected with the first photoelectric detector 11.
In a specific implementation, the first pump source 12 is mainly configured to generate pump light with a center wavelength of 980nm, and the power of the first pump source 12 may be 680mW, where the power is the rated power of the first pump source 12, and the following description of the pump source power is the rated power. The first IGFF unit 6 may take the form commonly used in the art, in order to enable isolation and filtering. The first optical splitter 2, the first isolator 3, the first wavelength division multiplexer 4 and the first length of erbium doped fiber 5 may all take conventional forms so as to be capable of performing gain amplification on the LP-band signal through the first stage erbium doped fiber unit.
In one embodiment of the utility model, the second stage erbium doped fiber unit comprises a second wavelength division multiplexer 7, wherein,
The input end of the second wavelength division multiplexer 7 is connected with the output end of the first IGFF unit 6, the 980nm connecting end of the second wavelength division multiplexer 7 is connected with the second pumping source 13, the public end of the second wavelength division multiplexer 7 is connected with one end of the second section of erbium-doped fiber 8, and the other end of the second section of erbium-doped fiber 8 is connected with the second IGFF unit 10 in an adapting mode.
Specifically, the second pump source 13 is configured to generate pump light, where a center wavelength of the pump light generated by the second pump source 13 is 980nm, and a power of the second pump source 13 is 680mW. The second IGFF unit 10 may take the form commonly used in the art, in order to enable isolation and filtering. The second wavelength division multiplexer 7 and the second erbium doped fiber section 8 can be in conventional forms, so as to amplify the LP-band optical signal by using the second stage erbium doped fiber unit.
In one embodiment of the utility model, the third stage erbium doped fiber unit includes a third splitter 16 for mating with the second IGFF unit 10, wherein,
The third beam splitter 16 is also connected with a variable attenuator 17 and a second photodetector 23 in an adapting manner;
The variable attenuator 17 is connected with the input end of the fourth optical splitter 18, the fourth optical splitter 18 is connected with the fourth wavelength division multiplexer 19 and the third photoelectric detector 24 in an adapting way, and the 980nm connecting end of the fourth wavelength division multiplexer 19 is connected with the fourth pumping source 25;
The common end of the fourth wavelength division multiplexer 19 is connected to one end of the third segment of erbium-doped fiber 20, and the other end of the third segment of erbium-doped fiber 20 is connected to the third IGFF unit 22, and is connected to the fourth stage of erbium-doped fiber unit in an adaptive manner through the third IGFF unit 22.
Further, the light splitting ratio of the third light splitter 16 is 1/99, wherein 99% of the light splitting ends of the third light splitter 16 are connected with the variable attenuator 17, and 1% of the light splitting ends of the third light splitter 16 are connected with the second photoelectric detector 23;
The light splitting ratio of the fourth light splitter 18 is 1/99, wherein 99% of the light splitting ends of the fourth light splitter 18 are connected to the 1600nm connection end of the fourth wavelength division multiplexer 19, and 1% of the light splitting ends of the fourth light splitter 18 are connected to the third photodetector 24.
Specifically, the fourth pump source 25 is configured to generate pump light, the center wavelength of the pump light generated by the fourth pump source 25 is 980nm, and the power of the fourth pump source 25 is 775mW. The third IGFF unit 22 may take the form commonly used in the art to enable isolation and filtering.
In addition, the third optical splitter 16, the variable attenuator 17, the fourth optical splitter 18, the fourth wavelength division multiplexer 19, the third erbium doped fiber 20, the third IGFF unit 22, the second photodetector 23 and the third photodetector 24 may all take conventional forms, and may be specifically selected according to the need so as to be able to gain-amplify the LP-band optical signal.
In an embodiment of the utility model, a gain enhancement unit is further comprised, wherein,
The gain enhancement unit comprises a third wavelength division multiplexer 9 arranged in the second-stage erbium-doped optical fiber unit, a fifth wavelength division multiplexer 21 arranged in the third-stage erbium-doped optical fiber unit, and a second optical splitter 15 which is adaptively connected with the third wavelength division multiplexer 9 and the fifth wavelength division multiplexer 21;
The other end of the second section of erbium-doped fiber 8 is connected with the common end of the third wavelength division multiplexer 9, and the 1600nm connecting end of the third wavelength division multiplexer 9 is connected with the second IGFF unit 10 in an adaptive manner and is connected with the third stage of erbium-doped fiber unit in an adaptive manner through the second IGFF unit 10;
The other end of the third section of erbium-doped fiber 20 is connected with the common end of the fifth wavelength division multiplexer 21, and the 1600nm connecting end of the fifth wavelength division multiplexer 21 is connected with the third IGFF unit 22 and is adaptively connected with the fourth-stage erbium-doped fiber unit through the third IGFF unit 22;
The second beam splitter 15 is connected with the third pump source 14;
The beam splitting ratio of the second beam splitter 15 is 49/51, wherein the 51% beam splitting end of the second beam splitter 15 is connected to the 980nm connection end of the third wavelength division multiplexer 9, and the 49% beam splitting end of the second beam splitter 15 is connected to the 980nm connection end of the fifth wavelength division multiplexer 21.
As can be seen from fig. 1 and the above description, after the LP-band optical signal is gain-amplified by the first-stage erbium-doped optical fiber unit, the second-stage erbium-doped optical fiber unit, and the third-stage erbium-doped optical fiber unit, since the length of the erbium-doped optical fiber is long, gain amplification by the gain-enhancing unit is required to be performed in order to achieve gain amplification of the signal. One embodiment of a gain enhancement unit is shown in fig. 1.
Specifically, the third pump source 14 is configured to generate pump light, and the center wavelength of the pump light generated by the third pump source 14 is 980nm, and the power of the third pump source 14 is 680mW. In addition, the third wavelength division multiplexer 9, the fifth wavelength division multiplexer 21, and the second optical splitter 15 may take conventional forms.
In one embodiment of the utility model, the fourth stage erbium doped fiber unit includes a sixth wavelength division multiplexer 26 for adaptively coupling to the third IGFF unit 22, wherein,
The 1600nm connection end of the sixth wavelength division multiplexer 26 is connected with the third IGFF unit 22, the 980nm connection end of the sixth wavelength division multiplexer 26 is connected with the fifth pump source 32, and the public end of the sixth wavelength division multiplexer 26 is connected with one end of the fourth section of erbium-doped fiber 27;
The other end of the fourth section of erbium-doped fiber 27 is connected with the common end of the seventh wavelength division multiplexer 28, the 1600nm connecting end of the seventh wavelength division multiplexer 28 is connected with the second isolator 29, and the 980nm connecting end of the seventh wavelength division multiplexer 28 is connected with the sixth pumping source 33;
the second isolator 29 is connected to the output signal port fitting 31.
In practice, the second isolator 29 is connected by a fifth splitter 30, which is adapted to the output signal port 31, wherein,
The light splitting ratio of the fifth light splitter 30 is 1/99, wherein 99% of the light splitting ends of the fifth light splitter 30 are connected with the output signal port 31, and 1% of the light splitting ends of the fifth light splitter 30 are connected with the fourth photodetector 34.
Specifically, the fifth pump source 32 and the sixth pump source 33 are configured to generate pump light, where the center wavelength of the generated pump light is 980nm; the power of the sixth pump source 33 is 775mW; the power of the fifth pump source 32 was 680mW.
In particular, the second isolator 29 may be a single-stage isolator, and the sixth wavelength division multiplexer 26, the fourth erbium doped fiber 27, the seventh wavelength division multiplexer 28, and the fifth optical splitter 30 may be conventional, and may be selected as needed.
In specific implementation, the length ratios of the first section of erbium-doped fiber 5, the second section of erbium-doped fiber 8, the third section of erbium-doped fiber 20, and the fourth section of erbium-doped fiber 27 may be: 1:1:2:1.5; of course, other conditions may be employed for the specific length ratio, as long as the reduction of noise in transmitting LP-band is achieved.
Claims (10)
1. An erbium-doped fiber amplifier supporting LP-band, characterized in that the erbium-doped fiber amplifier comprises an erbium-doped fiber amplifying main body part, an input signal port for loading an LP-band optical signal into the erbium-doped fiber amplifying main body part, and an output signal port for outputting the LP-band optical signal after gain-amplifying by the erbium-doped fiber amplifying main body part,
The erbium-doped fiber amplifying main body part at least comprises four stages of erbium-doped fiber units, and each stage of erbium-doped fiber unit comprises an erbium-doped fiber;
According to the transmission path of the LP-band optical signal, the four stages of erbium-doped fiber units in the erbium-doped fiber amplifying main body part are a first stage erbium-doped fiber unit, a second stage erbium-doped fiber unit, a third stage erbium-doped fiber unit and a fourth stage erbium-doped fiber unit in sequence,
The first-stage erbium-doped optical fiber unit is connected with the input signal port, the fourth-stage erbium-doped optical fiber unit is connected with the output signal port, and the first-stage erbium-doped optical fiber unit, the second-stage erbium-doped optical fiber unit, the third-stage erbium-doped optical fiber unit and the fourth-stage erbium-doped optical fiber unit are sequentially and adaptively connected in series;
the LP-band optical signal loaded by the input signal port is amplified by the first stage erbium-doped optical fiber unit, the second stage erbium-doped optical fiber unit, the third stage erbium-doped optical fiber unit and the fourth stage erbium-doped optical fiber unit in turn, and is output by the output signal port.
2. The LP-band supported erbium doped fiber amplifier of claim 1, wherein: the first-stage erbium-doped optical fiber unit comprises a first optical splitter which is connected with an input signal port in an adaptive manner, and the first optical splitter is connected with a first photoelectric detector and a first isolator in an adaptive manner;
the output end of the first isolator is connected with the 1600nm connecting end of the first wavelength division multiplexer, and the 980nm connecting end of the first wavelength division multiplexer is connected with the first pumping source in an adaptive manner;
the common end of the first wavelength division multiplexer is connected with the first IGFF units in an adaptive manner through the first section of erbium-doped fiber, and is connected with the second stage of erbium-doped fiber units in an adaptive manner through the first IGFF units.
3. The LP-band supported erbium doped fiber amplifier of claim 2, wherein: the first isolator is a two-stage isolator;
The light splitting proportion of the first light splitter is 5/95, wherein 95% light splitting ports of the first light splitter are connected with the input end of the first isolator, and 5% light splitting ports of the first light splitter are connected with the first photoelectric detector.
4. The LP-band supported erbium doped fiber amplifier of claim 2, wherein: the second stage erbium doped fiber unit includes a second wavelength division multiplexer, wherein,
The input end of the second wavelength division multiplexer is connected with the output end of the first IGFF units, the 980nm connecting end of the second wavelength division multiplexer is connected with the second pumping source, the public end of the second wavelength division multiplexer is connected with one end of the second section of erbium-doped fiber, and the other end of the second section of erbium-doped fiber is connected with the second IGFF units in an adaptive mode.
5. The LP-band supported erbium doped fiber amplifier of claim 4, wherein: the third stage erbium doped fiber unit comprises a third optical splitter for adaptively connecting with the second IGFF units, wherein,
The third optical splitter is also connected with the variable attenuator and the second photoelectric detector in an adapting way;
The variable attenuator is connected with the input end of the fourth optical splitter, the fourth optical splitter is connected with the fourth wavelength division multiplexer and the third photoelectric detector in an adaptive manner, and the 980nm connecting end of the fourth wavelength division multiplexer is connected with the fourth pumping source;
the public end of the fourth wavelength division multiplexer is connected with one end of the third section of erbium-doped fiber, and the other end of the third section of erbium-doped fiber is connected with the third IGFF unit in an adaptive mode.
6. The LP-band supported erbium doped fiber amplifier of claim 5, wherein: and further comprises a gain enhancement unit, wherein,
The gain enhancement unit comprises a third wavelength division multiplexer arranged in the second-stage erbium-doped optical fiber unit, a fifth wavelength division multiplexer arranged in the third-stage erbium-doped optical fiber unit and a second optical splitter which is adaptively connected with the third wavelength division multiplexer and the fifth wavelength division multiplexer;
The other end of the second section of erbium-doped fiber is connected with the common end of a third wavelength division multiplexer, and the 1600nm connecting end of the third wavelength division multiplexer is connected with a second IGFF unit in an adaptive manner and is connected with a third-stage erbium-doped fiber unit in an adaptive manner through a second IGFF unit;
The other end of the third section of erbium-doped fiber is connected with the common end of a fifth wavelength division multiplexer, and the 1600nm connecting end of the fifth wavelength division multiplexer is connected with a third IGFF unit and is adaptively connected with a fourth-stage erbium-doped fiber unit through the third IGFF unit;
The second beam splitter is connected with a third pump source;
The light splitting ratio of the second light splitter is 49/51, wherein the 51% light splitting end of the second light splitter is connected with the 980nm connecting end of the third wavelength division multiplexer, and the 49% light splitting end of the second light splitter is connected with the 980nm connecting end of the fifth wavelength division multiplexer.
7. The LP-band supported erbium doped fiber amplifier of claim 5 or 6, wherein: the light splitting proportion of the third light splitter is 1/99, wherein 99% of the light splitting ends of the third light splitter are connected with the variable attenuator, and 1% of the light splitting ends of the third light splitter are connected with the second photoelectric detector;
The light splitting proportion of the fourth light splitter is 1/99, wherein 99% of the light splitting ends of the fourth light splitter are connected with the 1600nm connecting end of the fourth wavelength division multiplexer, and 1% of the light splitting ends of the fourth light splitter are connected with the third photoelectric detector.
8. The LP-band supported erbium doped fiber amplifier of claim 5 or 6, wherein: the fourth stage erbium-doped fiber unit includes a sixth wavelength division multiplexer for adaptively connecting the third IGFF units, wherein,
The 1600nm connecting end of the sixth wavelength division multiplexer is connected with the third IGFF units, the 980nm connecting end of the sixth wavelength division multiplexer is connected with the fifth pumping source, and the public end of the sixth wavelength division multiplexer is connected with one end of the fourth section of erbium-doped fiber;
The other end of the fourth section of erbium-doped fiber is connected with the public end of the seventh wavelength division multiplexer, the 1600nm connecting end of the seventh wavelength division multiplexer is connected with the second isolator, and the 980nm connecting end of the seventh wavelength division multiplexer is connected with the sixth pumping source;
the second isolator is adapted to be connected to the output signal port.
9. The LP-band supported erbium doped fiber amplifier of claim 8, wherein: the second isolator is connected with the output signal port in a matching way through a fifth optical splitter, wherein,
The light splitting ratio of the fifth light splitter is 1/99, wherein 99% light splitting end of the fifth light splitter is connected with the output signal port, and 1% light splitting end of the fifth light splitter is connected with the fourth photoelectric detector.
10. The LP-band supported erbium doped fiber amplifier of claim 8, wherein: the center wavelength of pump light generated by the first pump source, the second pump source, the third pump source, the fourth pump source, the fifth pump source and the sixth pump source is 980nm;
the power of the fourth pumping source and the sixth pumping source is 775mW;
The power of the first pump source, the second pump source, the third pump source and the fifth pump source is 680mW.
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