Device and method for controlling transient effect in erbium-doped fiber amplifier (EDFA)

Abstract

The invention discloses a device and a method for controlling the transient effect in an erbium-doped fiber amplifier (EDFA). The device comprises a photoelectric detection diode, a transconductance circuit, an analog to digital converter, a digital processor and a pump laser which are connected in sequence, wherein the pump laser is used for the analog to digital converter, and the photoelectricdetection diode is used for receiving the optical fiber inputted by the EDFA. The method comprises the following steps: making the digital signals obtained by the conversion of the analog to digital converter enter a first in first out (FIFO) data queue to capture the change of optical intensity; comparing the data on the head and the tail of the FIFO data queue under the normal stage model and making the FIFO data queue be in the pre-regulation stage mode if the change of the optical intensity being more than a set proportion; locking the data on the head of the FIFO data queue, continuouslycomparing the data on the head of the FIFO data queue and the data on the tail of the FIFO data queue and making the FIFO data queue be in the over-regulation stage model if the change of the opticalintensity being more than a preset proportion; and finally adjusting the control current of the pump laser of the EDFA rapidly when the optical intensity changing suddenly so as to control the transient effect. The invention can be used for adjusting the EDFA of any type and any requirement without changing the hardware, thus the production efficiency and the flexibility are improved.

Description

technical field [0001] The invention relates to a control method for suppressing transient effects in EDFA. In particular, it relates to a control method capable of effectively suppressing the transient effect of EDFA, thereby improving the performance of the EDFA and ensuring the stability and reliability of the entire optical communication system for suppressing the transient effect in the EDFA. Background technique [0002] In Dense Wavelength Division System (DWDM), when the input optical signal intensity of Erbium-doped Fiber Amplifier (EDFA) changes greatly, for example, when only 1 channel of optical signals with different wavelengths becomes 40 channels, the total input optical intensity suddenly When the drop is about 16dB, the energy in the bait fiber will be transferred to the remaining signal instantly, causing the signal to overshoot, otherwise it will be undershoot. Overshoot and undershoot will seriously affect the stability of the system when multi-stage EDF...

AI Technical Summary

Problems solved by technology

[0003] Transient suppression can be studied from three aspects: optics, hardware and software, and the former two require an increase in cost

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