Hybrid optical fiber amplifier as well as method and device for adjusting gain and gain slope of amplifier

An amplifier gain, hybrid fiber technology, applied in the field of optical communication, can solve the problems of inability to achieve amplification effect, large EDFA noise index, and no unified control.

Active Publication Date: 2012-12-26
GUANGXUN SCI & TECH WUHAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a hybrid optical fiber amplifier, which aims to solve the problem that the existing independently adjusted RFA and EDFA cannot achieve the desired amplification effect due to the lack of unified control, and the technology that the existing EDFA with built-in VOA has a large noise index question

Method used

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  • Hybrid optical fiber amplifier as well as method and device for adjusting gain and gain slope of amplifier
  • Hybrid optical fiber amplifier as well as method and device for adjusting gain and gain slope of amplifier
  • Hybrid optical fiber amplifier as well as method and device for adjusting gain and gain slope of amplifier

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Embodiment 1

[0022] figure 1 A structural diagram of the hybrid fiber amplifier provided by the first embodiment of the present invention is shown, and only parts related to the embodiment of the present invention are shown for convenience of description.

[0023] The hybrid fiber amplifier provided by the embodiment of the present invention includes: a Raman fiber amplifier 1 and an erbium-doped fiber amplifier 2 that does not contain a variable attenuator, and the Raman fiber amplifier 1 includes a pump signal combiner 11, and the pump The pump laser group 12 connected to the reflection end of the pump signal multiplexer 11, the out-of-band narrow-band filter 13 connected to the output end of the pump signal multiplexer 11, and the out-of-band narrow-band filter 13 connected to the transmission end of the out-of-band narrow-band filter 13 Photodetector 14, described erbium-doped fiber amplifier 2 comprises input coupler 21, erbium-doped optical fiber 22, output coupler 23 connected in se...

Embodiment 2

[0029] The embodiment of the present invention provides a method for adjusting the gain and gain slope of a hybrid fiber amplifier. As shown in Embodiment 1, the hybrid fiber amplifier includes a Raman fiber amplifier and an erbium-doped fiber amplifier that does not contain a variable attenuator. The adjustment method provided in this embodiment includes the following steps:

[0030] Step S201, adjusting the gain G of the Raman fiber amplifier according to the expected amplification requirements R , gain slope T R and / or adjust the gain G of the erbium-doped fiber amplifier E , gain slope T E , to achieve, to adjust the overall gain G of the hybrid fiber amplifierH and / or total gain slope T H .

[0031] In this step, the total gain G of the hybrid fiber amplifier H is Raman fiber amplifier gain G R with erbium-doped fiber amplifier gain G E sum, the total gain slope of the hybrid fiber amplifier T H is the gain slope T of the Laraman fiber amplifier R with Erbium-dop...

Embodiment 3

[0037] In this embodiment, the expected amplification requirement is the overall gain slope T of the hybrid fiber amplifier H Adjust the overall gain G without changing H .

[0038] In this embodiment, adjust the erbium-doped fiber amplifier gain G E , Raman fiber amplifier gain G R keep constant while adjusting the Raman fiber amplifier gain slope T R to compensate for the erbium-doped fiber amplifier gain G E The change in gain slope caused by the change.

[0039] For example, it is necessary to adjust the total gain G of the hybrid amplifier H From 28dB to 30dB gain change, the overall gain slope of the hybrid amplifier T H Keep 0 unchanged, such as image 3 shown, given by adjusting the EDFA gain G E with RFA gain slope T R Schematic diagram of realizing the gain change of the hybrid fiber amplifier. In the illustration, the EDFA gain G in the initial state E 18dB, the gain slope T E is 0, RFA gain G R 10dB, the gain slope T R is 0, in order to achieve the tot...

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Abstract

The invention is suitable for the technical field of optical communication and provides a hybrid optical fiber amplifier as well as a method and device for adjusting the gain and the gain slope of the amplifier. The hybrid optical fiber amplifier comprises an RFA (Raman fiber amplifier) and an EDFA (erbium doped fiber amplifier), wherein the EDFA excludes a variable attenuator; the RFA comprises a pump signal multiplexer, a pump laser group, an out-of-band narrow-band filter and a photoelectric detector; the EDFA comprises an input coupler, an erbium doped fiber, an output coupler, an input photoelectric detector and an output photoelectric detector, all of which are connected in sequence; and the hybrid optical fiber amplifier further comprises a control module for controlling the RFA and/or EDFA to adjust the gain and/or the gain slope according to an excepted amplification requirement. Due to the fact that the RFA and the EDFA are controlled and coordinated by the control module according to the technical scheme, an excepted amplification effect can be achieved; in addition, a series of problems caused by the variable attenuator can be avoided due to the fact that the EDFA excludes the variable attenuator.

Description

technical field [0001] The invention belongs to the technical field of optical communication, and in particular relates to a hybrid optical fiber amplifier and a method and device for adjusting its gain and gain slope. Background technique [0002] In the field of optical communication, in order to enable optical signals to transmit longer distances, fiber amplifiers have become one of the essential devices. Raman fiber amplifiers (Raman fiber amplifier, RFA) and erbium-doped fiber amplifiers (erbium-doped fiber amplifier, EDFA) ) has been widely used in communication systems. With the gradual commercialization of 100G coherent communication systems, the system’s demand for RFA will also increase. At the same time, since the gain medium of RFA is the transmission fiber itself, the gain coefficient is relatively low. It has unique advantages in improving the optical signal-to-noise ratio (OSNR) of the system, but it is less cost-effective in terms of power improvement. Compar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/17
CPCH04B10/2916H01S3/2375H01S3/06754H01S3/094096H01S2301/04H04B10/294H01S3/302H03F3/087H03F3/08H03G3/3084
Inventor 付成鹏张翠红熊涛乐孟辉陶金涛余振宇景运瑜卜勤练余春平
Owner GUANGXUN SCI & TECH WUHAN
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