CN214313856U - Bidirectional optical amplifier of single-core bidirectional communication system - Google Patents
Bidirectional optical amplifier of single-core bidirectional communication system Download PDFInfo
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- CN214313856U CN214313856U CN202120546557.0U CN202120546557U CN214313856U CN 214313856 U CN214313856 U CN 214313856U CN 202120546557 U CN202120546557 U CN 202120546557U CN 214313856 U CN214313856 U CN 214313856U
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Abstract
The utility model belongs to the technical field of the fiber communication technique and specifically relates to indicate a two-way optical amplifier of single core two-way communication system, it includes first dispersion compensation optical fiber, second dispersion compensation optical fiber, first wavelength division multiplexer, second wavelength division multiplexer, third wavelength division multiplexer, first pump light source, second pump light source, third pump light source, first wave filter, second wave filter and erbium-doped optical fiber. The utility model realizes the function of bidirectional amplification; the influence of dispersion under the long-distance communication condition can be effectively reduced, and the gain effect of Raman amplification is obviously improved; the signal-to-noise ratio of the transmission signal is improved.
Description
Technical Field
The utility model belongs to the technical field of the fiber communication technique and specifically relates to indicate a two-way optical amplifier of single core two-way communication system.
Background
With the continuous development of internet technology, the optical fiber communication technology has also advanced greatly, wherein the optical fiber amplifier is a key device for increasing the laying distance of the optical fiber. A commonly used optical fiber amplifier is a unidirectional erbium-doped optical fiber amplifier, and the principle of the amplifier is that input light enters an erbium-doped optical fiber, and population inversion is realized under the action of pump light, so that erbium ions are subjected to stimulated radiation to generate photons with the same wavelength as the input light, and the function of optical amplification is realized; the optical isolator with one-way transmission is added in the structure, so that the amplifier is ensured to have higher signal-to-noise ratio.
However, the main problem faced by the bidirectional erbium-doped fiber amplifier is that if the pump light energy is too high, the optical amplifier will generate self-excitation effect due to the back rayleigh scattering effect, so that the optical signal-to-noise ratio of the output light is deteriorated; the common method for preventing self-excitation is to add an isolator after the erbium-doped fiber to limit the direction of the optical path, which is also the reason why the common optical amplifier is mostly unidirectional.
With the development of Wavelength Division Multiplexing (WDM), many channels are often transmitted in one optical fiber, and in some special applications, communication systems with different channels and different directions are transmitted in one optical fiber; in this case, the conventional unidirectional fiber amplifier cannot be used, and a bidirectional fiber amplifier is required.
Disclosure of Invention
The utility model provides a bidirectional optical amplifier of a single-core bidirectional communication system aiming at the problems of the prior art, which realizes the function of bidirectional amplification; the influence of dispersion under the long-distance communication condition can be effectively reduced, and the gain effect of Raman amplification is obviously improved; the signal-to-noise ratio of the transmission signal is improved.
In order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model provides a two-way optical amplifier of single core two-way communication system, including first dispersion compensation optic fibre, second dispersion compensation optic fibre, first wavelength division multiplexer, second wavelength division multiplexer, third wavelength division multiplexer, first pump light source, second pump light source, third pump light source, first wave filter, second wave filter and erbium-doped fiber; the output end of the first dispersion compensation optical fiber is connected with a first wavelength division multiplexer, the first pumping light source is connected with the first wavelength division multiplexer in a coupling mode, the first wavelength division multiplexer is connected with a second wavelength division multiplexer through a first filter, the second pumping light source is connected with the second wavelength division multiplexer in a coupling mode, the second wavelength division multiplexer is connected with a second filter through the erbium-doped optical fiber, the second filter is connected with a third wavelength division multiplexer, the third pumping light source is connected with the third wavelength division multiplexer in a coupling mode, and the third wavelength division multiplexer is connected with the input end of the second dispersion compensation optical fiber.
Wherein, the first pumping light source and the third pumping light source are 1455nm pumping light sources.
Wherein the second pump light source is a 1480nm pump light source.
The erbium-doped optical fiber is a quartz optical fiber doped with erbium ions.
The utility model has the advantages that:
the utility model introduces the combination of the Raman amplifier and the traditional erbium-doped fiber amplifier, and realizes the function of bidirectional amplification; the first dispersion compensation fiber and the second dispersion compensation fiber are added in the amplifier, so that the influence of dispersion under the long-distance communication condition can be effectively reduced, and the gain effect of Raman amplification is obviously improved; the Raman amplifier can realize the function of distributed amplification by matching with the preorder communication optical fiber and the postorder communication optical fiber; due to the introduction of the Raman amplifier, the gain of the erbium-doped fiber amplifier can be properly reduced, so that the scattered light on a path is reduced, the influence of self excitation of the amplifier on input light is also reduced, and the signal-to-noise ratio of a transmission signal is improved.
Drawings
Fig. 1 is a schematic structural diagram of a bidirectional optical amplifier of a single-core bidirectional communication system according to the present invention.
The reference numerals in fig. 1 include:
1. a first dispersion compensating fiber; 2. a first wavelength division multiplexer; 3. a first pump light source; 4. a first filter; 5. a second pump light source; 6. a second wavelength division multiplexer; 7. an erbium-doped fiber; 8. a second filter; 9. a third pump light source; 10. a third wavelength division multiplexer; 11. a second dispersion compensating fiber.
Detailed Description
In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention will be described in detail with reference to the accompanying drawings.
A bidirectional optical amplifier of a single-core bidirectional communication system, as shown in fig. 1, includes a first dispersion compensation fiber 1, a second dispersion compensation fiber 11, a first wavelength division multiplexer 2, a second wavelength division multiplexer 6, a third wavelength division multiplexer 10, a first pump light source 3, a second pump light source 5, a third pump light source 9, a first filter 4, a second filter 8 and an erbium-doped fiber 7; the output end of the first dispersion compensation fiber 1 is connected with the first wavelength division multiplexer 2, the first pump light source 3 is coupled with the first wavelength division multiplexer 2, the first wavelength division multiplexer 2 is connected with the second wavelength division multiplexer 6 through the first filter 4, the second pump light source 5 is coupled with the second wavelength division multiplexer 6, the second wavelength division multiplexer 6 is connected with the second filter 8 through the erbium-doped fiber 7, the second filter 8 is connected with the third wavelength division multiplexer 10, the third pump light source 9 is coupled with the third wavelength division multiplexer 10, and the third wavelength division multiplexer 10 is connected with the input end of the second dispersion compensation fiber 11. Wherein, the first pump light source 3 and the third pump light source 9 are 1455nm pump light sources. Wherein, the second pump light source 5 is a 1480nm pump light source. The erbium-doped fiber 7 is a silica fiber doped with erbium ions.
The erbium-doped fiber 7 is a silica fiber doped with erbium ions, and can generate photons with the same wavelength as the input light through the transition of the erbium ions under the excitation of pump light, thereby realizing the function of optical signal amplification.
The filter filters the pumping light emitted by the pumping light source and the noise generated in the amplification process, reduces the influence of the noise on the optical communication system, and improves the signal to noise ratio of the signal.
The pumping source is 1455nm and 1480nm, both of which are semiconductor lasers, the light source with 1455nm wavelength is used for Raman amplification, and the light source with 1480nm wavelength is used for amplification of the erbium-doped fiber 7.
The wavelength division multiplexer serves as a coupler in the amplifier, plays a role of mixing pump light generated by the pump light source and input light, and is a passive optical device.
The dispersion compensation fiber has two functions in the system: the Raman fiber dispersion compensation system has the advantages that firstly, the optical fiber dispersion caused by long-distance transmission is compensated, the quality of signals is improved, and secondly, the Raman fiber dispersion compensation system is matched with a Raman amplification system, so that the amplification gain is obviously increased.
In the embodiment, the Raman fiber amplifier and the bidirectional erbium-doped fiber 7 amplifier are mixed, so that the optical amplification function is realized at the relay node; the dispersion compensation optical fiber can compensate the dispersion problem of optical transmission in long-distance communication, and is used as a high-gain medium of a Raman optical fiber amplifier to amplify optical signals; the amplifiers of each stage are connected by using a filter, and the filter is used for filtering redundant ASE noise; the middle bidirectional erbium-doped optical fiber 7 amplifier adopts a low gain mode, so that a lower output amplified optical signal is obtained, and a subsequent distributed Raman optical fiber amplifier is matched to obtain a smaller Rayleigh scattering signal, so that smaller optical amplifier noise is obtained, and the total gain and the signal-to-noise ratio of each side of bidirectional amplification can reach the level of the traditional unidirectional communication optical amplifier.
The first dispersion compensation fiber 1, the second dispersion compensation fiber 11, the first wavelength division multiplexer 2, the second wavelength division multiplexer 6, the third wavelength division multiplexer 10, the first pump light source 3, the second pump light source 5, the third pump light source 9, the first filter 4, the second filter 8 and the erbium-doped fiber 7 are connected through communication fibers.
In this embodiment, a forward input optical signal is input through a first dispersion compensation fiber 1, the first dispersion compensation fiber 1 can play a role in compensating dispersion caused by long-distance signal transmission, an output end of the first dispersion compensation fiber is connected with a first wavelength division multiplexer 2, the first wavelength division multiplexer 2 plays a role in coupling, a first pump light source 3 is coupled into a light path, and the first dispersion compensation fiber 1 in the preamble is matched with the first dispersion compensation fiber to play a role in distributed raman amplification; the input light after Raman amplification has a pumping light component, so that the pumping light is filtered by the first filter 4, then the input light is connected to the second wavelength division multiplexer 6, coupled with the second pumping light source 5 and injected into the erbium-doped optical fiber 7, and the amplification function of the erbium-doped optical fiber 7 is realized; the amplified signal light enters a second-stage Raman amplifier after being filtered by a second filter 8 to remove pump light and spontaneous radiation noise light, a third pump light source 9 is coupled into a light path through a third wavelength division multiplexer 10, the function of distributed Raman amplification is realized through the cooperation with a preorder communication optical fiber, and finally, the amplified signal light is output through a dispersion compensation optical fiber, so that the dispersion is reduced, and simultaneously the gain of Raman amplification is further increased.
In addition, a reverse input optical signal is input through the second dispersion compensation fiber 11, the second dispersion compensation fiber 11 can play a role in compensating dispersion caused by long-distance signal transmission, the output end of the second dispersion compensation fiber is connected with the third wavelength division multiplexer 10, the third wavelength division multiplexer 10 plays a role in coupling, the third pump light source 9 is coupled into a light path, and the third dispersion compensation fiber 11 is matched with the fiber to play a role in distributed raman amplification; the input light after Raman amplification has a pump light component, so that the pump light and the spontaneous radiation noise light are filtered by the second filter 8, and then are injected into the erbium-doped fiber 7 and coupled with the second pump light source 5 by matching with the second wavelength division multiplexer 6, so that the amplification function of the erbium-doped fiber 7 is realized; the amplified signal light enters a second-stage Raman amplifier after being filtered by a first filter 4 to remove pump light and spontaneous radiation noise light, a first pump light source 3 is coupled into a light path through a first wavelength division multiplexer 2, the function of distributed Raman amplification is realized through matching with a subsequent communication optical fiber, and finally, the dispersion is reduced and the gain of Raman amplification is further increased through a first dispersion compensation optical fiber 1.
In the embodiment, the Raman amplifier is introduced to be mixed with the traditional erbium-doped fiber 7 amplifier, so that the function of bidirectional amplification is realized; the raman amplifier can realize the distributed amplification function of the optical communication system, and simultaneously, the introduction of the raman amplification can limit the gain of the erbium-doped fiber 7 amplifier, reduce the scattered light in the path and improve the signal-to-noise ratio of the transmission signal.
The utility model has the advantages that:
the utility model introduces the combination of the Raman amplifier and the traditional erbium-doped optical fiber 7 amplifier, and realizes the function of bidirectional amplification; the first dispersion compensation fiber 1 and the second dispersion compensation fiber 11 are added in the amplifier, so that the influence of dispersion under the long-distance communication condition can be effectively reduced, and the gain effect of Raman amplification is obviously improved; the Raman amplifier can realize the function of distributed amplification by matching with the preorder communication optical fiber and the postorder communication optical fiber; due to the introduction of the Raman amplifier, the gain of the erbium-doped fiber 7 amplifier can be properly reduced, so that the scattered light on a path is reduced, the influence of self excitation of the amplifier on input light is also reduced, and the signal-to-noise ratio of a transmission signal is improved.
The above description is only for the preferred embodiment of the present invention, and the present invention is not limited to the above description, and although the present invention is disclosed in the preferred embodiment, it is not limited to the above description, and any person skilled in the art can make some changes or modifications to equivalent embodiments without departing from the scope of the present invention, but all the technical solutions of the present invention are within the scope of the present invention.
Claims (4)
1. A bidirectional optical amplifier of a single-core bidirectional communication system is characterized in that: the erbium-doped fiber dispersion compensation device comprises a first dispersion compensation fiber (1), a second dispersion compensation fiber (11), a first wavelength division multiplexer (2), a second wavelength division multiplexer (6), a third wavelength division multiplexer (10), a first pump light source (3), a second pump light source (5), a third pump light source (9), a first filter (4), a second filter (8) and an erbium-doped fiber (7); the output end of a first dispersion compensation fiber (1) is connected with a first wavelength division multiplexer (2), a first pump light source (3) is coupled with the first wavelength division multiplexer (2), the first wavelength division multiplexer (2) is connected with a second wavelength division multiplexer (6) through a first filter (4), a second pump light source (5) is coupled with the second wavelength division multiplexer (6), the second wavelength division multiplexer (6) is connected with a second filter (8) through an erbium-doped fiber (7), the second filter (8) is connected with a third wavelength division multiplexer (10), a third pump light source (9) is coupled with a third wavelength division multiplexer (10), and the third wavelength division multiplexer (10) is connected with the input end of the second dispersion compensation fiber (11).
2. A bidirectional optical amplifier of a single core bidirectional communication system according to claim 1, wherein: the first pump light source (3) and the third pump light source (9) are 1455nm pump light sources.
3. A bidirectional optical amplifier of a single core bidirectional communication system according to claim 1, wherein: the second pumping light source (5) is a 1480nm pumping light source.
4. A bidirectional optical amplifier of a single core bidirectional communication system according to claim 1, wherein: the erbium-doped optical fiber (7) is a quartz optical fiber doped with erbium ions.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112968349A (en) * | 2021-03-16 | 2021-06-15 | 东莞先进光纤应用技术研究院有限公司 | Bidirectional optical amplifier of single-core bidirectional communication system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112968349A (en) * | 2021-03-16 | 2021-06-15 | 东莞先进光纤应用技术研究院有限公司 | Bidirectional optical amplifier of single-core bidirectional communication system |
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Effective date of registration: 20220505 Address after: 523000 Workshop on the 1st and 2nd floors of building 4, small and medium-sized science and technology enterprise entrepreneurship Park, North Industrial City, Songshanhu high tech Industrial Development Zone, Dongguan City, Guangdong Province Patentee after: Dongguan advanced optical fiber Application Technology Research Institute Co.,Ltd. Patentee after: Guangdong Fuan Technology Development Co., Ltd Address before: 523000 Workshop on the 1st and 2nd floor, building 4, small and medium sized science and technology enterprise Pioneer Park, northern industrial city, Songshanhu high tech Development Zone, Dongguan City, Guangdong Province Patentee before: Dongguan advanced optical fiber Application Technology Research Institute Co.,Ltd. |
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