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Link spectrum adjustment method and system based on dwdm

An adjustment method and a technology for adjusting the system, applied in the direction of the wavelength division multiplexing system, etc., can solve the problems of keeping the total optical power constant or not, so as to reduce the nonlinear effect of the line, reduce the impact, and ensure the bit error rate of the line Effect

Active Publication Date: 2019-01-29
FENGHUO COMM SCI & TECH CO LTD
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  • Description
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  • Application Information

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Problems solved by technology

However, the above methods are all based on adjusting the wavelength power of each optical channel, which cannot keep the total optical power constant, and need to be adjusted one by one

Method used

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  • Link spectrum adjustment method and system based on dwdm
  • Link spectrum adjustment method and system based on dwdm
  • Link spectrum adjustment method and system based on dwdm

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Embodiment Construction

[0027] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0028] see figure 1 As shown, the DWDM-based link spectrum adjustment method in the embodiment of the present invention includes the following steps:

[0029] S1: Set up a DWDM system in each site. The DWDW system includes an EDFA (Erbium-doped Optical Fiber Amplifie, Erbium-doped Optical Fiber Amplifier) ​​equipped with an EVOA (Electrically Adjustable Optical Attenuator), see figure 2 As shown, adjacent EVOAs are connected end-to-end, and go to S2.

[0030] S2: EVOA sets the actual optical power of the corresponding EDFA according to the preset expected optical power value, that is, the actual optical power of the EDFA is set to be the same as the expected optical power value, and then transfers to S3.

[0031] S3: When the optical power difference between adjacent EDFAs is within the specified threshold (2dB in this embodiment, directly ...

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Abstract

The invention discloses a link spectrum adjustment method and a link spectrum adjustment system based on dense wavelength division multiplexing (DWDM), and relates to the technical field of long-distance high-speed optical communication transmission. The method comprises the steps of setting a DWDM system in each site, wherein the DWDM system comprises an EDFA provided with an EVOA; setting actualoptical power of the corresponding EDFA by the EVOA according to a preset expected optical power value; when an optical power difference between the adjacent EDFA is more than a specified threshold,using the EDFA with the actual optical power less than the expected optical power value as the target EDFA, and adjusting the actual optical power of the target EDFA by the EVOA corresponding to the target EDFA according to the expected optical power value. According to the method and the system provided by the invention, distributed optical link spectrum adjustment is achieved, and influence brought by circuit attenuation variation is compensated; therefore, the optical power output by EDFA of each site keeps the theoretical expected value invariable, influence caused by the non-linear effectof a circuit of a high-speed transmission system is reduced, and the optical communication transmission system can operate stably for a long term.

Description

technical field [0001] The invention relates to the technical field of long-distance high-speed optical communication transmission, in particular to a link spectrum adjustment method and system based on DWDM (Dense Wavelength Division Multiplexing). Background technique [0002] When a communication operator deploys, operates and maintains a long-distance high-speed optical communication transmission system, it usually needs to adjust the services of various sites (such as increase or decrease and dispatch services), and the adjustment of services will inevitably lead to changes in the number of wavelengths and total optical power of the communication system. (The sum of the optical power of all sites) changes, which in turn will greatly affect the quality and stability of the optical transmission signal, and some wavelengths will be affected by factors such as OSNR (Optical Signal Noise Ratio, optical signal-to-noise ratio) or sensitivity drop. Therefore, it is necessary to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J14/02
Inventor 李健源梅亮
Owner FENGHUO COMM SCI & TECH CO LTD