Time expansion analog-digital converter based on stimulated Brillouin effect

Abstract

The invention discloses a time expansion analog-digital converter based on a stimulated Brillouin effect. The time expansion analog-digital converter comprises a continuous wave signal source, and the continuous wave signal source, a modulator, a first circulator, a nonlinear stimulated Brillouin effect optical fiber, a second circulator, an erbium-doped optical fiber amplifier and a first polarization controller are sequentially connected; a radio-frequency signal source modulates a continuous wave from a third port of the modulator; a pumping source enters the converter from a third port of the second circulator; a second port of the first polarization controller is sequentially connected with a first wavelength division multiplexer, a high nonlinear optical fiber, a second polarization controller and a second wavelength division multiplexer and then connected into a third port of a coupler; a third port of the first wavelength division multiplexer is connected into a first port of the coupler; a clock signal source is connected with a first isolator, and the first isolator is connected into a second port of the coupler; a second isolator is connected with a filter, and the filter is connected into a fourth port of the coupler.

Description

technical field [0001] The invention belongs to the technical field of optical information, and in particular relates to a time-stretching analog-to-digital converter based on the stimulated Brillouin effect. Background technique [0002] Traditional analog-to-digital converters have low sampling rates and effective input bandwidths, while time-stretching analog-to-digital converters use optical time-stretching technology to increase the overall sampling rate and effective input bandwidth of the analog-to-digital converter system. Optical time stretching technology mainly stretches the light pulse linearly by using the second-order dispersion parameter of the optical fiber, and stretches the light pulse in the time domain. In this way, at the same sampling rate, after time stretching, the sampled waveform is closer to the original waveform. tend to be consistent. Contents of the invention [0003] Based on the present situation above, the present invention discloses a tim...

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Problems solved by technology

[0002] The sampling rate and effective input bandwidth of the traditional analog-to-digital converter are low, and the time-stretched analog-to-digital converter uses optical time-stretch technology to increase the overall sampling rate and effective input bandwidth of the analog-to-digital converter system

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