System and method for photon sampling based on OEO

Abstract

The present invention discloses a system for photon sampling based on an OEO. The system for photon sampling based on the OEO comprises an optical narrow pulse source based on the OEO and a time domain Fourier transform system. The optical narrow pulse source based on the OEO is generated by a wavelength double-ring OEO structure, a directly modulated laser and a phase modulator are integrated into the wavelength double-ring OEO structure, microwave signals are generated by the OEO structure, the directly modulated laser is modulated to generate optical narrow pulses, the phase modulator is employed to broaden the pulse width to obtain wide-spectrum narrow pulses, and a long fiber dispersive medium is employed to perform dispersion walk-off of the narrow pulses to form constant-amplitude chirped narrow pulses and perform signal sampling. The system and the method employ a characteristic that the OEO structure directly generates signals with high repetition frequency and low phase noise, and combine the time domain Fourier transform system to simplify a production process and an optical serial-parallel converting process of the pulse source with a high repeat rate in photon samplingand have a characteristic of ultralow jittering. The system and the method for photon sampling based on the OEO can be widely applied to the fields of optical communication, optical analog-digital conversion, laser radar, microwave photonics, etc.

Description

technical field [0001] The invention relates to a photon sampling system based on OEO (optical oscillator), in particular to an optical narrow pulse source and time-domain Fourier transform sampling system based on OEO. Background technique [0002] Digital signal processing technology with high flexibility and high reliability has brought revolutionary development to all aspects of human society. To realize the conversion from analog signal to digital signal, analog to digital conversion (Analog to Digital Converter, referred to as ADC) is its key technology. With the continuous improvement of people's requirements for the rate and accuracy of information cognition, acquisition, and transmission, people's demand for ADC technology with high bandwidth, high sampling rate, and high quantization accuracy is also increasingly urgent. However, the traditional electrical ADC technology is limited by the electronic aperture jitter and electronic transit time uncertainty, and its ...

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Problems solved by technology

However, there are technical difficulties in directly adopting the wave-time division optical pulse scheme under high-speed sampling conditions

First of all, in order to achieve high time resolution, each optical pulse needs to be a narrow pulse, and the spectral width of each wavelength pulse is quite wide. The number of wavelengths of the entire wave time division source is limited, and it is difficult to achieve large serial-to-parallel conversion. Compare

Secondly, the large peak-to-average ratio of the narrow pulse source determines that the average power of the sampling pulse entering the photodetector cannot be too high, so the noise of the photoelectric conversion will directly limit the accuracy of the system

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