Single-sideband modulation type time-domain broadening analog-to-digital converter

Abstract

The invention discloses a single-sideband modulation type time-domain broadening analog-to-digital converter, which comprises a supercontinuum laser source (10), a hybrid coupler (20), an electro-optic modulator (30) and a photoelectric converter (40). The supercontinuum laser source (10) is used for producing an ultrashort optical pulse train and outputting the ultrashort optical pulse train to the electro-optic modulator (30) through a first optical fiber (1); the hybrid coupler (20) is used for coupling electric signals to be detected which are received by a first port and outputting two electric signals with identical frequencies and 90-degree phase difference to the electro-optic modulator (30); the electro-optic modulator (30) is used for intensity modulation of the optical pulse train output by the first optical fiber (1) through receiving the two electric signals from the hybrid coupler (20) and receiving a bias voltage with a fourth port, wherein the optical pulse train after modulation is output to the photoelectric converter (40) through a second optical fiber (2); and the photoelectric converter (40) is used for the photoelectric conversion of the optical pulse train output by the second optical fiber (2) and the output of electric signals after conversion to an ordinary analog-to-digital converter (50). The invention can lower requirement for the sampling rate of the electronic analog-to-digital converter.

Description

technical field [0001] The invention relates to the technical field of electro-optical analog-to-digital converters, in particular to single-sideband modulated time-stretched (Single-Sideband Modulated 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. The traditional electronic analog-to-digital (A / D) converter is difficult to meet the requirements due to structural limitations, so an electro-optic analog-to-digital converter appears. The single-sideband modulation time-domain stretching analog-to-digital converter is a kind of electro-optical analog-to-digital converter. form. [0003] Analog-to-di...

AI Technical Summary

Problems solved by technology

Now, the further improvement of the performance of the electronic analog-to-digital (A / D) converter has encountered major technical problems: 1. Reduce the aperture jitter (aperture jitter) to below 1ps; 2. The maximum sampling rate exceeds 8Gs / s; 3. When meeting the On the basis of 1 and 2, the power consumption is reduced to below 5W

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