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Method for suppressing coherent crosstalk in optical transmission system and optical transmission system

An optical transmission and optical transmission unit technology, applied in transmission systems, electromagnetic wave transmission systems, optical fiber transmission, etc., can solve the problems of increasing manufacturing difficulty and system cost, and achieve the effect of reducing performance requirements, improving performance, and reducing system costs.

Inactive Publication Date: 2006-09-06
HUAWEI TECH CO LTD
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Problems solved by technology

Such a narrow-spectrum light source has a long coherence length, and the resulting coherent crosstalk limits the extension of the transmission distance and the increase of the transmission channel of the DWDM system, and also limits the application of OADM and OXC. For OADM, OXC and other devices Higher performance requirements are put forward, which increases manufacturing difficulty and system cost

Method used

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  • Method for suppressing coherent crosstalk in optical transmission system and optical transmission system
  • Method for suppressing coherent crosstalk in optical transmission system and optical transmission system
  • Method for suppressing coherent crosstalk in optical transmission system and optical transmission system

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Embodiment Construction

[0011] Hereinafter, the present invention will be further described in detail through specific embodiments in conjunction with the accompanying drawings.

[0012] The main point of the present invention is to use multi-line light sources instead of single-line narrow-band light sources commonly used in optical transmission networks to realize signal transmission and achieve the purpose of suppressing nonlinear crosstalk. Including the generation of a multi-line light source within a specific wavelength range, the use of electrical signals to modulate the multi-line light source to generate modulated optical signals of different wavelengths, these optical signals are transmitted and received through the DWDM optical transmission system, and nonlinear crosstalk is suppressed in the process. Among them, the characteristic of the generated multi-line spectrum is that the spectral width of each spectral line is smaller than the spectral line interval and smaller than the wavelength int...

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Abstract

Transmission process is as following. Optical signals in multichannel through optical multiplexing unit are combined into one transmission optical fiber. Passing through one or more optical transmission units, signals are transferred to optical demultiplexing unit. Through optical demultiplexing unit, optical signals in different channels are assigned to different optical receiver so as to realize transmission of optical signal. The characters are that generated optical signal in each channel is modulated by same electric signal by using multiline light source. Transmission of optical signal is realized by using multiline light source instead of narrowband light source so as to reduce coherent length of signal, and restrain non-linear cross talk and noise of beat frequency between transmission channels. The invention raises performances of transferring optical signal, lowers performance requirement for parts used in optical network. Thus, it reduces system cost.

Description

Technical field: [0001] The invention relates to a method for suppressing coherent crosstalk in an optical transmission system and an optical transmission system. Background technique: [0002] Dense Wavelength Division Multiplexing (DWDM) has been widely used in optical transmission networks. With the further improvement of optical network performance requirements, optical add / drop multiplexing (OADM) and optical cross-connect (OXC) equipment and technologies have gradually begun to be applied. Due to the extension of the transmission distance and the improvement of the flexibility of the optical network, the reduction of the quality of the optical transmission signal has become an important factor restricting the application and scale of the optical network. [0003] Dense wavelength division multiplexing optical communication system (DWDM) is usually composed of optical transmitters, interference filters, fiber gratings or planar waveguide gratings, optical receivers, etc. Bec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02H04B10/08H04B10/2507
Inventor 李长春
Owner HUAWEI TECH CO LTD
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