Analog-to-digital converter for time domain broadening of differential light pulse
An analog-to-digital converter and time-domain broadening technology, used in optical analog/digital converters, optics, instruments, etc., can solve problems such as structural limitations, and achieve the effect of fewer components, high integration, and high conversion rate.
Inactive Publication Date: 2012-06-06
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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Problems solved by technology
Traditional electronic analog-to-digital converters are difficult to meet the requirements due to structural limitations, so electro-optical analog-to-digital converters appear. Differential photonic time-stretched analog-to-digital converters are a kind of electro-optic analog-to-digital converters form
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[0028] see figure 1 , an optical pulse time-domain stretching analog-to-digital converter of the present invention, comprising: a supercontinuum laser light source 11, an electro-optic modulator 12, a photosensitive device 13, and a common analog-to-digital converter 14, wherein:
[0029] The supercontinuum laser light source 11 comprises: an optical fiber mode-locked laser 21, which produces optical pulses; an erbium-doped fiber amplifier 23, whose input end is connected with the output end of the semiconductor pump laser 21 through a photonic crystal 22; A pass filter 24, the input end of the band pass filter 24 is connected with the output end of the erbium-doped fiber amplifier 23, and the output end of the band pass filter 24 is the output end of the supercontinuum laser light source 11. The output signal period of the supercontinuum laser light source 11 is T.
[0030] The output end of the supercontinuum laser source 11 is connected to the input end of the electro-opti...
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Abstract
The invention relates to an analog-to-digital converter for time domain broadening of differential light pulses. The analog-to-digital converter comprises a supercontinuum laser source, an electro-optic modulator, a time delay, a synthesizer, a photosensitive device and the analog-to-digital converter, wherein the input end of the electro-optic modulator is connected with the output end of the supercontinuum laser source through a first optical fiber, and the electro-optic modulator receives electric signals to be detected and is supplied with bias voltage; the input end of the time delay is connected with the output end of a normal-phase signal of the electro-optic modulator so that the normal-phase signal end of the electro-optic modulator generates a T / 2 delay, and T is greater than zero; the input end of the synthesizer is connected with the output end of the time delay and the output end of a inverse-phase signal of the electro-optic modulator; the input end of the photosensitivedevice is connected with the output end of the synthesizer through a second optical fiber; and the input end of the analog-to-digital converter is connected with the output end of the photosensitive device.
Description
technical field [0001] The invention relates to the technical field of electro-optic analog-to-digital converters, in particular to differential photonic time-stretched analog-to-digital converters. Background technique [0002] The role of the analog-to-digital (A / D) converter is to convert the analog signal obtained by the sensor into digital information through sampling, quantization, encoding and other processes. With the development of signal processing systems, the requirements for sampling rate and conversion accuracy of analog-to-digital (A / D) converters are increased. Traditional electronic analog-to-digital (A / D) converters are difficult to meet the requirements due to structural limitations, so electro-optical analog-to-digital converters appear, and differential photonic time-stretched analog-to-digital converters are electro-optical A form of digital converter. [0003] Analog-to-digital conversion generally goes through four processes of sampling, holding, qu...
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IPC IPC(8): G02F7/00G02F1/35
Inventor 张强倪卫宁
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI