WDM system instantaneous optimization control method and system

Abstract

The invention discloses a WDM system-level transient optimization control method and a system. The method includes that transient control parameters are obtained according to the system configuration; the transient control parameters are sent down to amplifiers of each level; after a WDM sender receives a transient simulated generation instruction, the actual power conversion waveform is generated and output to the primary amplifier of the WDM transmission system; the actual power conversion waveform passes through the amplifiers of each level and reaches a WDM receiver, and the WDM receiver obtains the actual transient response waveform; the actual transient response waveform is compared with the actually-set working point of the receiving device to obtain the transient control parameters of the amplifiers of each level, and the transient control parameters are sent down to the amplifiers of each level; and repeat the processes to obtain the objective transient control waveform. The invention can optimize the WDM system-level transient control effect as well as make the engineering application convenient and flexible, with large application value.

Description

technical field [0001] The present invention relates to a system-level optimal control method for transient control of optical amplifiers in an optical transmission system, in particular to system-level transients in the case of cascading multi-stage optical amplifiers in a long-distance multi-span optical transmission system The control effect is optimized. Background technique [0002] The emergence of optical amplifiers, especially EDFA, has accelerated the development of optical communication. EDFA itself has the following advantages: transparent to data format and rate; Regenerative repeater saves cost; large gain bandwidth expands transmission capacity. These advantages make EDFA the most widely used in optical communication. [0003] However, the unfavorable factors caused by some inherent characteristics of EDFA also pose challenges to designers. One of the main problems is the problem of EDFA gain transient response. If the number of optical channels passing thr...

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Problems solved by technology

[0013] However, the existing solutions are more complex and costly

Especially for the transient control of single-stage EDFA, due to the complex application environment, it is difficult to meet the transient index requirements under all working conditions, such as different amplitudes of increasing and decreasing waves, different speeds of increasing and decreasing waves, and different wavelengths of increasing and decreasing waves , different remaining operating wavelength (surviving channel), different incident signal-to-noise ratio, etc., it is difficult to achieve the optimal control effect under various conditions at the same time

[0014] At the same time, the final application of the WDM system is not as simple as single-stage amplification. In the long-distance transmission system, the one-way transmission can include more than 20 levels of optical amplification units cascaded. complex

[0015] At present, the main difficulties of single-stage EDFA transient control are: increase and decrease wave amplitude; Based on sampling speed and decision threshold

There is often a delay of tens of microseconds from the transient occurrence to the judgment; the signal-to-noise ratio of the input signal, in the WDM system, the signal-to-noise ratio of the input signal at each stage of EDFA is different under normal working conditions; the cascading effect is unknown, only Ability to rely on single-stage control effects

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