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Optical amplifier gain noise compensation apparatus and method for optical transmission system

An optical amplifier and noise compensation technology, applied in the field of optical transmission systems, can solve the problems of high cost and difficult implementation of small signal noise compensation, and achieve the effects of simple scheme, low implementation cost and convenient engineering application

Inactive Publication Date: 2011-10-26
郭红朵 +3
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Problems solved by technology

[0013] The technical problem to be solved by the present invention is the shortcoming of the high cost of implementing small signal noise compensation by hardware in the prior art and the difficulty in implementing it, in order to propose a low-cost, easy-to-implement optical amplifier gain noise compensation device and method

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  • Optical amplifier gain noise compensation apparatus and method for optical transmission system
  • Optical amplifier gain noise compensation apparatus and method for optical transmission system
  • Optical amplifier gain noise compensation apparatus and method for optical transmission system

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Embodiment Construction

[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] Method and device of the present invention are mainly based on the following analysis:

[0036] EDFA noise (linear units): NF ( v ) = Pase Ghv B 0 + 1 G

[0037] In the formula, NF is the noise index, Pase is the ASE power, G is the gain, h is Planck's constant, v is the frequency, and the center frequency can be taken, B 0 for the bandwidth.

[0038] Generally, the EDFA gain is above 10dB, and 1 / G can be ignored. For different wavelengths, NF is considered to be unchanged.

[0039] Then the ASE power is:

[0040] Pase=NF*G*hvB 0

[0041] For NF, if the gain is constant, it can be considered as a constant, while for hvB 0 , can also be re...

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Abstract

The present invention provides an optical amplifier gain noise compensation device and a method in optical transmission systems. Wherein, the method includes steps below: 1. A gain control module acquires current compensation factors according to calibration data and transmits the compensation factor to an optical power detecting module; 2. An incident light detecting module corrects incident light power; 3. The gain control module calculates gains according to input and output light power; if the gain is locked, it is necessary to execute step 2; if the gain is excessively strong, it needs to reduce drive current in light of step length and return to step 2; if the gain is too weak, the drive current is increased according to step length and step 2 prevails. The present invention realizes noise power compensation, fulfills tangible signal gain locking and has the advantages of simple proposal and lower cost, and convenience, flexibility and great practical values in aspect of engineering application.

Description

technical field [0001] The invention relates to an optical transmission system, in particular to a compensating device and method for gain noise of an optical amplifier in the optical transmission system. Background technique [0002] The emergence and development of optical communication technology has greatly promoted the development of the entire communication industry, thus further promoting the progress of social economy. In the development of optical communication technology, the optical amplifier is an indispensable technology. The optical amplifier can greatly extend the transmission distance, reduce the system cost, and has high transparency to the format and rate of the signal, making the whole system simpler , robust, flexible, efficient, and inexpensive. The successful development of Erbium Doped Fiber Amplifier (EDFA, Erbium Doped Fiber Amplifier) ​​is a milestone in the development of optical communication. Its appearance broke the limitation of optical fiber...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B10/17H04B10/08G02F1/39H04B10/294
Inventor 邹红兵朱晓宇
Owner 郭红朵
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