All-light analog-digital converter 2SSX parallel quantitative coding method

Abstract

The invention relates to a 2SSX parallel quantization coding method for an all-optical analog-to-digital converter. The method is as follows: the N-bit all-optical analog-to-digital converter is designed; stable sounding optical pulses and steering optical pulses (analog optical) are input into a splitting coupler array (2) through a wavelength division multiplexer or a polarization coupler (1); the coupler array (2) is formed by series connection of N-1 1x2 couplers, wherein, one output port of each 1x2 coupler is connected with a symmetrical Sagnac interferometer (3) and the other output port of each 1x2 coupler is connected with the next 1x2 coupler; an attenuator or an optical amplifier (4) is arranged on a position of each symmetrical Sagnac interferometer (3) close to a 3dB coupler; optical fiber microwave circulators or isolators (5) are arranged on the front of reflecting ports; and the output ports can be transmission ports of the Sagnac interferometers and also can be the reflecting ports and are provided with a band-pass filter or an analyzer (6) which only allows probe light to pass. The structure is combined with adequate splitting ratio of the coupler array (2) and adequate coefficients of the attenuator or the optical amplifier (4), so that the probe light generates Gray codes of parallel output light.

Description

technical field [0001] The present invention relates to the technical field of optical information processing, in particular to an all-optical analog-to-digital converter 2SSX parallel quantization encoding method, that is, N symmetrical Sagnac interference using N-1 1×2 coupler beam splitting input arrays Instrument (SagnacI) parallel output, based on self-phase modulation (SPM) and cross-phase modulation (XPM) principles of parallel quantization and encoding to achieve N-bit all-optical analog-to-digital converter. Background technique [0002] Optical signal processing, optical communication, and optical sensing are in urgent need of high-speed, high-precision analog-to-digital converters (ADCs), and all-optical technology is the most promising method to achieve this goal. All-optical ADC involves three basic units and key technologies of optical sampling, optical quantization and optical encoding. Researchers at home and abroad have satisfactorily solved the optical sam...

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Problems solved by technology

[0005] In 2007, we applied for the Chinese invention patent "All-optical Analog-to-Digital Converter (200710049158.8)", which uses a symmetrical Sagnac interferometer quantization and encoding of N 1×2 coupler beam splitting input arrays to realize N-bit all-optical Analog-to-digital converters, but the peak power of the control light (analog light) pulses is not optimally utilized

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