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Adaptive feedforward control device and method of optical amplifier

一种前馈控制、光放大器的技术，应用在电磁波传输系统、电气元件、传输系统等方向，能够解决发光效应随时间变化很大等问题，达到保持系统性能的效果

Active Publication Date: 2009-12-09
O NET COMM (SHENZHEN) LTD
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Problems solved by technology

[0006] In EDFA, the luminous efficiency of the pump laser and the insertion loss of passive devices are certain values, but as the laser ages, the luminous efficiency decreases, and the insertion loss of passive devices will also increase, especially without a refrigeration pump, which is popular because of its low cost. , but its luminous effect changes greatly with time, so it can be seen that EDFA is actually a time-varying system, and its parameters change with time

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  • Adaptive feedforward control device and method of optical amplifier
  • Adaptive feedforward control device and method of optical amplifier
  • Adaptive feedforward control device and method of optical amplifier

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Embodiment Construction

[0025] The feedforward adaptive control method of the present invention will be further described below in conjunction with the accompanying drawings.

[0026] First introduce the principle of the present invention. Such as figure 1 As shown, the transfer function of EDFA is a complex delay system in the frequency domain. In the EDFA system, the fiber delay time is within about 500 ns, and the effective data collection and calculation of the present invention are all carried out when the EDFA is in a steady state (the target output power and the actual output power are approximately equal and the change is small), ignoring the fiber delay and the system EDFA dynamic performance, and EDFA works in a saturated state, then the EDFA time domain transfer function can be approximated as the following formula.

[0027] Youti=Opi*1k+1b (1)

[0028] In the formula, Youti is the output signal power, Opi is the pump optical power

[0029] In the steady state, the actual output power ...

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Abstract

The invention relates to an adaptive feedforward control device and a method of an optical amplifier. The optical amplifier is a time-variation or slow time-variation system, the pumping luminous efficiency is reduced, devices are aged or no refrigeration pump works in a temperature variation environment, and therefore, feedforward parameters can be changed along with time. A time-domain transmission function of the optical amplifier is deduced in a steady state according to a dynamic transmission equation of the optical amplifier, then, a parametric estimator is designed according to the transmission function in the steady state so as to estimate and update a current feedforward value in real time, a new feedforward parameter can trace the change of system performance, and the instantaneous characteristic of the optical amplifier can not worsen for the time variation of a system parameter.

Description

technical field [0001] The invention relates to the problem of fast gain control in erbium-doped fiber amplifier (EDFA), in particular to an adaptive feed-forward control method in a time-varying EDFA system, which can automatically correct feed-forward control parameters according to EDFA parameter changes. Background technique [0002] In fiber optic communication systems, fiber amplifiers, especially erbium-doped fiber amplifiers (EDFA) have become one of the core components of communication systems. The generation and development of EDFA has greatly promoted the development of wavelength division multiplexing systems (WDM). However, with the continuous increase of the number of channels and the rate in the WDM system, the impact of random channel reconfiguration on the remaining channels is becoming more and more serious. [0003] The transient effect is mainly caused by the sudden change of the number of channels in the WDM system, which will cause the cross-gain satura...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B10/17
CPCH04B10/2931
Inventor 黄必昌虞爱华
Owner O NET COMM (SHENZHEN) LTD
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