CN111490445B - Amplifier based on distributed filter - Google Patents
Amplifier based on distributed filter Download PDFInfo
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- CN111490445B CN111490445B CN202010314929.7A CN202010314929A CN111490445B CN 111490445 B CN111490445 B CN 111490445B CN 202010314929 A CN202010314929 A CN 202010314929A CN 111490445 B CN111490445 B CN 111490445B
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- filter
- optical fiber
- input end
- wavelength division
- division multiplexer
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- 239000013307 optical fiber Substances 0.000 claims abstract description 62
- 230000003321 amplification Effects 0.000 claims abstract description 53
- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 53
- 238000001914 filtration Methods 0.000 claims abstract description 48
- 230000003287 optical effect Effects 0.000 claims abstract description 36
- 239000000835 fiber Substances 0.000 claims description 45
- 239000010409 thin film Substances 0.000 claims description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000001069 Raman spectroscopy Methods 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- 229910052691 Erbium Inorganic materials 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 239000000969 carrier Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
- H01S3/06758—Tandem amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—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
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06716—Fibre compositions or doping with active elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
Abstract
本发明公开了一种基于分布式滤波器的放大器，包括泵浦光源、第一光隔离器、滤波放大模块和第二光隔离器；所述泵浦光源的输出端通过光纤与滤波放大模块的输入端连接，所述滤波放大模块的输出端与第二光隔离器的输入端连接，所述第二光隔离器的输出端为基于分布式滤波器的放大器的输出端；所述第一光隔离器的输入端与信号光源连接，其输出端与第一波分复用器的输入端连接。本发明实现放大功能的光纤距离较长，在实现放大功能的光纤上放置N个滤波器，实现多级降噪，进一步提升信噪比。
The invention discloses an amplifier based on a distributed filter, comprising a pump light source, a first optical isolator, a filter amplifying module and a second optical isolator; The input end is connected, and the output end of the filtering and amplifying module is connected with the input end of the second optical isolator, and the output end of the second optical isolator is the output end of the amplifier based on the distributed filter; the first optical isolator The input end of the isolator is connected to the signal light source, and the output end of the isolator is connected to the input end of the first wavelength division multiplexer. In the present invention, the distance of the optical fiber for realizing the amplification function is relatively long, and N filters are placed on the optical fiber for realizing the amplifying function, so as to realize multi-stage noise reduction and further improve the signal-to-noise ratio.
Description
Technical Field
The invention belongs to the field of optical fiber sensing, and particularly relates to an amplifier based on a distributed filter.
Background
Erbium-doped fiber amplifiers and raman fiber amplifiers are widely used in the fields of fiber communication, fiber lasers and fiber sensing, and become indispensable optical amplification devices. The wavelength division multiplexing technology enables the capacity of optical fiber communication to be continuously improved, more multi-path optical carriers can be simultaneously transmitted in one optical fiber, and the successful application of the erbium-doped optical fiber amplifier and the Raman optical fiber amplifier enables the wavelength division multiplexing technology to really play a role, realizes long-distance and high-capacity all-optical transmission, and lays a foundation for long-distance optical fiber communication and long-distance optical fiber sensing. When the basic erbium-doped fiber amplifier and the raman fiber amplifier amplify signal light, noise amplification or new noise generation is caused, and when the signal light is weak and the signal-to-noise ratio is low, the noise has a large influence on the system performance.
Disclosure of Invention
Aiming at the defects in the prior art, the amplifier based on the distributed filter solves the problem that the erbium-doped fiber amplifier and the Raman fiber amplifier in the prior art can cause noise amplification or generate new noise when amplifying signal light.
In order to achieve the purpose of the invention, the invention adopts the technical scheme that: a distributed filter-based amplifier comprises a pumping light source, a first optical isolator, a filtering amplification module and a second optical isolator;
the output end of the pumping light source is connected with the input end of the filtering amplification module through an optical fiber, the output end of the filtering amplification module is connected with the input end of a second optical isolator, and the output end of the second optical isolator is the output end of an amplifier based on a distributed filter; the input end of the first optical isolator is connected with the signal light source, and the output end of the first optical isolator is connected with the input end of the first wavelength division multiplexer.
Furthermore, the filtering and amplifying module comprises an optical fiber with an amplifying function, and the optical fiber with the amplifying function is provided with N filters.
Furthermore, the optical fiber with the amplification function is an erbium-doped optical fiber or a single-mode optical fiber.
Further, the filtering and amplifying module further comprises a first wavelength division multiplexer; the filter is a long-period fiber grating filter, and N long-period fiber grating filters are engraved on the optical fiber with the amplification function;
the input end of the first wavelength division multiplexer is the input end of the filtering amplification module, and the output end of the first wavelength division multiplexer is connected with the second optical isolator through an optical fiber with an amplification function.
Furthermore, the filtering and amplifying module further comprises a first wavelength division multiplexer, and the filter is a thin film filter;
the input end of the first wavelength division multiplexer is the input end of the filtering amplification module, and the output end of the first wavelength division multiplexer, the N thin film filters and the second optical isolator are sequentially connected through optical fibers with an amplification function.
Further, the filter is the filtering structure, the filtering amplification module includes a plurality of N filtering structures that connect gradually through the optic fibre that has the amplification function, the filtering amplification module is connected with second optical isolator through the optic fibre that has the amplification function.
Further, the filtering structure comprises a second wavelength division multiplexer, an ultra-narrow line width filter and a third wavelength division multiplexer which are connected in sequence; the input end of the second wavelength division multiplexer is the input end of the filter structure, the output end of the second wavelength division multiplexer is connected with the input end of the third wavelength division multiplexer, and the output end of the third wavelength division multiplexer is the output end of the filter structure.
The invention has the beneficial effects that:
(1) the invention realizes the amplification of weak signal light by utilizing erbium-doped fiber or common single-mode fiber under the action of pump light, simultaneously realizes the graded amplification by utilizing multi-stage filtering, adds a filter to inhibit newly generated noise light after each grade of amplification, and keeps the pump light and the signal light to realize the low-noise amplification.
(2) When the filter is a long-period fiber grating, the fiber grating is inscribed on the optical fiber with the amplification function, so that the optical fiber with the amplification function reduces the fusion points of the optical fiber, reduces the loss and better ensures the intensity of signal light.
(3) When the filter is of a filtering structure, the filter is easy to obtain, can better retain signal light and pump light, and can inhibit the generation of noise.
(4) The optical fiber with the amplification function has longer time in actual operation, can amplify signals and transmit the signals, realizes amplification and transmission, is favorable for reducing cost, and has great application potential in the field of ultra-long distance distributed optical fiber sensing and the field of ultra-long distance optical fiber communication.
Drawings
Fig. 1 is a schematic diagram of an amplifier based on a distributed filter according to the present invention;
FIG. 2 is a schematic diagram of an amplifier including an erbium doped fiber and a long period fiber grating filter;
FIG. 3 is a schematic diagram of an amplifier including a single mode fiber and a long period fiber grating filter;
FIG. 4 is a schematic diagram of an amplifier including an erbium doped fiber and a thin film filter;
FIG. 5 is a schematic diagram of an amplifier including a single mode fiber and a thin film filter;
FIG. 6 is a schematic diagram of an amplifier including an erbium doped fiber and a filtering structure;
FIG. 7 is a schematic diagram of an amplifier including a single mode fiber and a filtering structure;
fig. 8 is a schematic diagram of a filtering structure according to the present invention.
Detailed Description
The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and it will be apparent to those skilled in the art that various changes may be made without departing from the spirit and scope of the invention as defined and defined in the appended claims, and all matters produced by the invention using the inventive concept are protected.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
As shown in fig. 1, a distributed filter-based amplifier includes a pump light source, a first optical isolator, a filtering amplification module, and a second optical isolator;
the output end of the pumping light source is connected with the input end of the filtering amplification module through an optical fiber, the output end of the filtering amplification module is connected with the input end of a second optical isolator, and the output end of the second optical isolator is the output end of an amplifier based on a distributed filter; the input end of the first optical isolator is connected with the signal light source, and the output end of the first optical isolator is connected with the input end of the first wavelength division multiplexer.
The filtering and amplifying module comprises an optical fiber with an amplifying function, and N filters are arranged on the optical fiber with the amplifying function.
The optical fiber with the amplification function is an erbium-doped optical fiber or a single-mode optical fiber, and the filter is a long-period fiber grating filter, a thin-film filter or a filtering structure.
Example one
In this embodiment, the central wavelength of the signal light emitted by the signal light source is 1550nm, the filter is a long-period fiber grating filter, and the filtering and amplifying module further includes a first wavelength division multiplexer, where N is 4.
As shown in fig. 2, when the fiber with amplification function is an erbium-doped fiber, the wavelength of light emitted by the pumping light source is 980nm, and N long-period fiber grating filters are inscribed on the erbium-doped fiber; the input end of the first wavelength division multiplexer is the input end of the filtering amplification module, and the output end of the first wavelength division multiplexer is connected with the second optical isolator through the erbium-doped optical fiber.
As shown in fig. 3, when the optical fiber with the amplification function is a single-mode optical fiber, the wavelength of the light emitted by the pump light source is 1450nm, and N long-period fiber grating filters are engraved on the single-mode optical fiber; the input end of the first wavelength division multiplexer is the input end of the filtering amplification module, and the output end of the first wavelength division multiplexer is connected with the second optical isolator through a single-mode optical fiber.
Example two
In this embodiment, the central wavelength of the signal light emitted by the signal light source is 1550nm, the filter is a thin film filter, and the filtering and amplifying module further includes a first wavelength division multiplexer, where N is 10.
As shown in fig. 4, when the fiber with amplification function is an erbium-doped fiber, the wavelength of light emitted by the pump light source is 980nm, the input end of the first wavelength division multiplexer is the input end of the filtering and amplifying module, and the output end thereof, the N thin-film filters and the second optical isolator are sequentially connected through the erbium-doped fiber.
As shown in fig. 5, when the optical fiber with the amplification function is a single-mode optical fiber, the wavelength of the light emitted by the pump light source is 1450nm, the input end of the first wavelength division multiplexer is the input end of the filtering and amplifying module, and the output end of the first wavelength division multiplexer, the N thin-film filters, and the second optical isolator are sequentially connected through the single-mode optical fiber.
EXAMPLE III
In this embodiment, the central wavelength of the signal light emitted by the signal light source is 1550nm, the filter has a filter structure, and N is 2.
As shown in fig. 6, when the fiber with amplification function is an erbium-doped fiber, the wavelength of light emitted by the pump light source is 980nm, the filtering and amplifying module includes N filtering structures sequentially connected through the erbium-doped fiber, and the filtering and amplifying module is connected with the second optical isolator through the erbium-doped fiber.
As shown in fig. 7, when the optical fiber with the amplification function is a single-mode optical fiber, the wavelength of the light emitted by the pump light source is 1450nm, the filtering and amplification module includes N filtering structures sequentially connected through the single-mode optical fiber, and the filtering and amplification module is connected with the second optical isolator through the single-mode optical fiber.
As shown in fig. 8, the filtering structure includes a second wavelength division multiplexer, an ultra-narrow linewidth filter, and a third wavelength division multiplexer, which are connected in sequence; the input end of the second wavelength division multiplexer is the input end of the filter structure, the output end of the second wavelength division multiplexer is connected with the input end of the third wavelength division multiplexer, and the output end of the third wavelength division multiplexer is the output end of the filter structure.
The working principle of the invention is as follows: the erbium-doped optical fiber or the single-mode optical fiber is used for realizing the amplification of a weak light signal under the action of pump light, and meanwhile, the multistage filter is used for realizing the stage amplification, new noise can be generated after each stage of signal light is amplified, the filter is used for filtering the noise after each stage of amplification, the intensity of the signal light is improved after the multistage amplification and the filtering, and meanwhile, the lower noise intensity is ensured, and the signal to noise ratio is improved.
The invention has the beneficial effects that:
(1) the invention realizes the amplification of weak signal light by utilizing erbium-doped fiber or common single-mode fiber under the action of pump light, simultaneously realizes the graded amplification by utilizing multi-stage filtering, adds a filter to inhibit newly generated noise light after each grade of amplification, and keeps the pump light and the signal light to realize the low-noise amplification.
(2) When the filter is a long-period fiber grating, the fiber grating is inscribed on the optical fiber with the amplification function, so that the optical fiber with the amplification function reduces the fusion points of the optical fiber, reduces the loss and better ensures the intensity of signal light.
(3) When the filter is of a filtering structure, the filter is easy to obtain, can better retain signal light and pump light, and can inhibit the generation of noise.
(4) The optical fiber with the amplification function has longer time in actual operation, can amplify signals and transmit the signals, realizes amplification and transmission, is favorable for reducing cost, and has great application potential in the field of ultra-long distance distributed optical fiber sensing and the field of ultra-long distance optical fiber communication.
Claims (5)
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| CN202010314929.7A CN111490445B (en) | 2020-04-21 | 2020-04-21 | Amplifier based on distributed filter |
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| CN202010314929.7A CN111490445B (en) | 2020-04-21 | 2020-04-21 | Amplifier based on distributed filter |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219043A (en) * | 1997-12-05 | 1999-06-09 | 清华大学 | Method of realizing dynamic gain spectrum equalization of wave-sharing complex system and its equalizing amplifier |
| CN1266995A (en) * | 1999-03-11 | 2000-09-20 | 三星电子株式会社 | Erbium doped optic fibre having grating formed therein and mfg. method thereof |
| CN102201642A (en) * | 2011-04-20 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | Method for protecting pumping source of optical device |
| CN104184038A (en) * | 2014-07-18 | 2014-12-03 | 浙江大学 | Er-doped optical fiber source and near-Gaussian spectrum output generating method thereof |
| CN104319611A (en) * | 2014-11-19 | 2015-01-28 | 天津光电通信技术有限公司 | Low-noise remote pump EDFA |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6897998B2 (en) * | 2002-11-19 | 2005-05-24 | The Boeing Company | Non-linear optical carrier frequency converter |
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2020
- 2020-04-21 CN CN202010314929.7A patent/CN111490445B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1219043A (en) * | 1997-12-05 | 1999-06-09 | 清华大学 | Method of realizing dynamic gain spectrum equalization of wave-sharing complex system and its equalizing amplifier |
| CN1266995A (en) * | 1999-03-11 | 2000-09-20 | 三星电子株式会社 | Erbium doped optic fibre having grating formed therein and mfg. method thereof |
| CN102201642A (en) * | 2011-04-20 | 2011-09-28 | 深圳市大族激光科技股份有限公司 | Method for protecting pumping source of optical device |
| CN104184038A (en) * | 2014-07-18 | 2014-12-03 | 浙江大学 | Er-doped optical fiber source and near-Gaussian spectrum output generating method thereof |
| CN104319611A (en) * | 2014-11-19 | 2015-01-28 | 天津光电通信技术有限公司 | Low-noise remote pump EDFA |
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