Nonlinear simplified modelling and adaptive model coefficient obtaining method for optical communication system

A technology for optical communication systems and model coefficients, applied in the field of nonlinear modeling, can solve problems such as upgrading, ignoring the nonlinear characteristics of the system, and inaccurate description of system frequency characteristics, so as to achieve improved estimation performance, strong engineering practicability, and simple principles Effect

Inactive Publication Date: 2018-03-16
CHINA SHIP DEV & DESIGN CENT
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Problems solved by technology

Due to the influence of factors such as saturation amplification, square-law detection, and modulation chirp in the low-cost optical transmission system, the frequency characteristics of the system cannot be simply described by a linear method, ignoring the nonlinear characteristics of the system, resulting in The description of frequency characteristics is inaccurate and cannot provide support for subsequent estimation or measurement
Although the latter takes nonlinear charact

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  • Nonlinear simplified modelling and adaptive model coefficient obtaining method for optical communication system
  • Nonlinear simplified modelling and adaptive model coefficient obtaining method for optical communication system
  • Nonlinear simplified modelling and adaptive model coefficient obtaining method for optical communication system

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[0052] In order to make the objectives, technical solutions, and advantages of the present invention clearer and more comprehensible, the following further describes the present invention in detail in conjunction with embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention.

[0053] Such as figure 1 As shown, a method for nonlinear simplified modeling and adaptive acquisition of model coefficients of an optical communication system includes the following steps:

[0054] 1) Receive the signal through the optical communication system directly detected, and the received signal is expressed as follows:

[0055]

[0056] Among them, s(t) is the transmitted optical signal, A is the DC bias, h(t) is the impulse response of the fiber, and its frequency response can be expressed as H(f)=exp(-jπDλ 2 Lf 2 / c), where D is the fiber dispersion, λ is the optical wavelength, f is the fr...

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Abstract

The invention discloses a nonlinear simplified modelling and adaptive model coefficient obtaining method for an optical communication system. The nonlinear simplified modelling and adaptive model coefficient obtaining method for the optical communication system comprises the steps of: (1), receiving a signal through a direct detection optical communication system; (2), performing taylor series expansion of radical sign terms on the received signal, and simplifying a model with the help of the Vitera series theory; and (3), obtaining various nonlinear term coefficients of the model. The invention provides the method for obtaining simplified model level model coefficients for describing the frequency characteristics of the direct detection system; the low-complexity nonlinear modelling problem of the direct detection optical communication system is solved; and thus, the method can be applied in response modelling and system frequency characteristic database construction for an optical communication equipment signal system. The nonlinear simplified modelling and adaptive model coefficient obtaining method for the optical communication system disclosed by the invention is concise in principle; and the provided simplified modelling method has relatively high engineering practicality.

Description

technical field [0001] The invention relates to a nonlinear modeling technology, in particular to a nonlinear simplified modeling of an optical communication system and a method for adaptively acquiring model coefficients. Background technique [0002] In order to evaluate and predict the transmission performance or sensitive effects of equipment, it is usually necessary to obtain the frequency characteristics of the equipment, so it is urgent to accurately model the signal characteristics of the equipment. At present, the frequency characteristics of low-cost optical transmission systems are usually modeled or only the linear characteristics of the receiving system are considered, or all nonlinear components are described by Vitra series. Due to the influence of factors such as saturation amplification, square law detection, and modulation chirp in the low-cost optical transmission system of the former, the frequency characteristics of the system cannot be simply described ...

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Application Information

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IPC IPC(8): H04B10/25H04B17/391G06F17/50
CPCG06F30/20H04B10/25H04B17/391
Inventor 陶理谭辉刘其凤方重华张崎
Owner CHINA SHIP DEV & DESIGN CENT
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