Photoelectric mixed phase-locked loop based on electric absorption regulator

An electro-absorption modulator and phase-locked loop technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of unfavorable voltage-controlled oscillator modulation, increase system complexity and cost, etc., achieve small time jitter, clock The effect of signal waveform stabilization

Inactive Publication Date: 2005-03-23
TSINGHUA UNIV
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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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  • Photoelectric mixed phase-locked loop based on electric absorption regulator
  • Photoelectric mixed phase-locked loop based on electric absorption regulator
  • Photoelectric mixed phase-locked loop based on electric absorption regulator

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Embodiment Construction

[0049] Phase detector in the present invention (see attached figure 2 ) works as follows: the input optical signal is modulated by the feedback signal through the electro-absorption modulator, and the dimmed signal undergoes photoelectric conversion through the low-speed photodetector, and the electrical signal output by the detector represents the average optical power of the dimmed signal, as The output signal of the phase detector. Since the average optical power of the modulated optical signal is related to the phase difference between the input optical signal and the feedback signal, this scheme can realize the phase detection function. The low-speed photodetector in the scheme plays the role of photoelectric conversion and low-pass filtering at the same time, replacing the combination of high-speed photodetector and low-pass filter commonly used, so there is no additional loop filter in the loop. The phase discrimination characteristic obtained by this scheme is

[00...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/08
Inventor 权爽张洪明姚敏玉
Owner TSINGHUA UNIV
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