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Optical amplifier gain noise compensation method and apparatus

A noise compensation, optical amplifier technology, applied in electromagnetic wave transmission systems, electrical components, transmission systems, etc., to achieve the effect of convenient engineering application and great application value

Active Publication Date: 2008-03-12
ZTE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the above problems, the present invention proposes an optical amplifier gain noise compensation method and device, which can realize the filtering of noise in the problem of optical amplifier gain locking, thereby realizing true signal gain locking

Method used

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  • Optical amplifier gain noise compensation method and apparatus
  • Optical amplifier gain noise compensation method and apparatus
  • Optical amplifier gain noise compensation method and apparatus

Examples

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no. 1 example

[0051] Fig. 3a is a view of a noise compensation circuit implemented based on an operational amplifier according to the first embodiment of the present invention.

[0052] Referring to Fig. 3a, in this embodiment, the gain control is realized by a hardware analog closed-loop circuit, and the noise power compensation circuit is realized by an operational amplifier, and the main method is to pressurize (add current) at the input end of the EDFA, that is, realize by an adder.

[0053] As shown in Figure 3a, since the ASE power is a fixed value for a fixed gain, that is to say, the PASE is a fixed power, and the incident light detection of the EDFA is a linear detection, so it is only necessary to add A fixed voltage value, as the equivalent incident light detection voltage, can realize the compensation function of ASE noise. Therefore, the corrected incoming light and the corresponding outgoing light signal are the final equivalent control parameters for gain locking control.

no. 2 example

[0055] Fig. 3b is a view of a noise compensation circuit implemented based on an operational amplifier according to a second embodiment of the present invention.

[0056] Referring to FIG. 3b, the gain control is also implemented by a hardware analog closed-loop circuit, and the noise power compensation circuit is implemented by an operational amplifier, that is, by a subtractor. The main method is to divide the voltage (shunt) at the output end of the EDFA. Different from Fig. 3a, in this embodiment, a fixed voltage value is added to the end of the light detection branch, so as to realize the compensation function of ASE noise.

[0057] 4a is a view of a noise compensation circuit realized based on a field programmable gate array (FPGA) according to a third embodiment of the present invention, and FIG. 4b is realized based on a field programmable gate array (FPGA) according to a fourth embodiment of the present invention The view of the noise compensation circuit, the FPGA-b...

no. 3 example

[0060] As shown in Figure 4a, the FPGA realizes the acquisition of the incident light analog electrical signal through the AD acquisition module 402, and the light incident correction amount setting module 406 and the adder module 404 correct the digital signal of the light incident detection and detection, so as to realize the reduction of the ASE noise. compensation function. Gain locking control is performed with the corrected incoming light and the corresponding outgoing light signal as the final equivalent control parameters.

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Abstract

The present invention provides an optical amplifier gain noise compensation method and a device. The device comprises an incident light correction setup module to set incident light correction digital signals, an AD collection module to collect incident light digital signals and a correction module to calculate the incident light correction digital signal according to digital electric signals to acquired corrected incident light detecting signals as control signals, thus realizing compensation for spontaneous radiation noises. Wherein, the incident light correction digital signal corresponds to a fixed compensation rate. Therefore, an incident light detecting circuit based on conclusions based on theories of the present invention to realize noise power compensation and tangible signal power gain control. Moreover, the device of the present invention substantially fulfills control over signal gain, ensures convenient and flexible engineering application and has greater practical values.

Description

technical field [0001] The invention relates to an optical amplifier gain noise compensation method and device in an optical transmission system, which can realize the filtering of noise in the optical amplifier gain locking problem, thereby realizing real signal gain locking. Background technique [0002] The emergence of optical amplifiers, especially erbium-doped fiber amplifiers (EDFAs), has accelerated the development of optical communications. EDFA itself has the following advantages: 1. It is transparent to the data format and rate; 2. It has large gain and low noise, and the noise figure is close to the quantum limit; 3. It directly amplifies the optical signal, eliminating the need for electrical regenerative repeaters and saving costs; And 4, the gain bandwidth is large, which expands the transmission capacity. These advantages make EDFA the most widely used in optical communication. [0003] However, the unfavorable factors caused by some inherent characteristic...

Claims

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Application Information

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IPC IPC(8): H04B10/14H04B10/17H04B10/293
Inventor 朱晓宇邹红兵
Owner ZTE CORP
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