Photoelectric mixed phase-locked loop based on electric absorption regulator

Abstract

A photoelectric mixed phase lock loop based on the electroabsorption modulator. It has the phase discriminator with the light signal as its input signal, which is made in the means of that the electroabsorption modulator connects with the low speed photo detector in series, the control circuit which is composed of the amplifying circuit and the bias circuit, and the voltage controlled oscillator, whose input terminal connects with the output terminal of the bias circuit and whose radio frequency output terminal connects with the feedback signal input terminal of the electroabsorption modulator. The input terminal of the abovementioned amplifying circuit connects with the phase error signal output terminal of the low speed photo detector. It has simple structure and can realize the locking of the input light signal by adjusting the central frequency of the voltage controlled oscillator.

Description

technical field [0001] The photoelectric hybrid phase-locked loop based on the electroabsorption modulator belongs to the field of high-speed optical signal clock extraction. Background technique [0002] The photoelectric hybrid phase-locked loop is a phase feedback system, which can maintain a definite relationship between the frequency and phase of the output electrical signal and the input optical signal, and suppress the phase noise of the input signal and the system itself. It can be applied to high-speed optical Clock extraction of signals. [0003] The photoelectric hybrid phase-locked loop is composed of three parts: a phase detector, a loop filter and a voltage-controlled oscillator. The two input ends of the phase detector, one end is connected to the input optical signal of the loop, and the other end is connected to the feedback signal output by the voltage-controlled oscillator; the error signal output by the phase detector is determined by the phase differenc...

AI Technical Summary

Problems solved by technology

This design mainly considers that the optical signal has only positive polarity, so the output signal of the phase detector also has a single polarity, which is not conducive to the modulation of the voltage-controlled oscillator later. The above-mentioned structure can solve this problem, but at the same time increases system complexity and cost

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