Dynamic range expanding method based on modulator offset point information acquisition

A dynamic range, bias point technology, applied in the direction of eliminating distortion/dispersion, fiber transmission, etc., can solve the problem of difficult parameter estimation in the digital domain, etc., to achieve the effect of offsetting nonlinear distortion

Inactive Publication Date: 2014-09-24
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

[0005] To sum up, the problem with the existing dynamic range enhancement method is that it is necessary to accurately know the specific transfer model of the system and accurately estimate the characteristic parameters of the system, which brings difficulties in accurate parameter estimation in the digital domain.

Method used

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  • Dynamic range expanding method based on modulator offset point information acquisition
  • Dynamic range expanding method based on modulator offset point information acquisition
  • Dynamic range expanding method based on modulator offset point information acquisition

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Embodiment Construction

[0037] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but should not be used to limit the scope of the present invention.

[0038] A dynamic range improvement method based on modulator bias point information acquisition provided by this implementation is as follows: figure 2 As shown, firstly, the numerical model of modulation nonlinear characteristics is clarified through modeling analysis, and the compensation function is constructed by extracting baseband and operating point information to complete the cancellation of distortion. The specific implementation process is as follows.

[0039] When the electrode center frequency of the first Mach-Zehnder modulator (MZM1) is input as ωm two-tone signal:

[0040] x(t)=ρ(t)cos(ω m t) (1)

[0041] where ρ(t)=2A m cos(Δt) is the equivalent envelope of the input dual-ton...

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Abstract

The invention relates to a dynamic range expanding method based on modulator offset point information acquisition. The method is characterized by comprising the following steps: firstly, establishing a numerical model, and providing a digital compensation algorithm; secondly, revealing the relation between a compensation coefficient and a modulator offset point; secondly, detecting the modulator output power to obtain the specific angle of the offset point; lastly, counteracting a distortion compensation coefficient with non-linear distortion of a modulator to obtain linear output. By adopting the method, nonlinear distortion of the modulator can be counteracted without accurately acquiring the specific propagation model of a system or accurately estimating system characteristic parameters. The difficulty in accurate parameter estimation in a digital domain in the prior art is avoided. The method can be widely applied to various optical links.

Description

technical field [0001] The invention relates to a method for improving the dynamic range based on the acquisition of modulator bias point information, in particular to a method for improving the dynamic range based on the digital signal processing (DSP) linearization technology acquired by working point information. Background technique [0002] Spurious-free dynamic range (SFDR) is one of the most important performance indicators of analog optical links. It comprehensively reflects the ability of a system to overcome the influence of noise, process weak signals, overcome the influence of nonlinear distortion, and process and receive strong signals. Under the action of the inherent nonlinear characteristics of the external intensity modulator, there are distortion interferences in the output signal, including harmonic distortion and intermodulation distortion, etc., which limit the spurious-free dynamic range of the analog optical link. [0003] In the prior art, an intermod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/2507
Inventor 戴一堂徐坤崔岩尹飞飞李建强
Owner BEIJING UNIV OF POSTS & TELECOMM
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