All-light analog-digital converter NASSX parallel quantitative coding method

A technology of digital converter and encoding method, applied in the field of optical information processing, can solve the problem that the peak power does not reach the optimal utilization rate, etc.

Inactive Publication Date: 2008-10-15
UNIV OF ELECTRONIC SCI & TECH OF CHINA
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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

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  • All-light analog-digital converter NASSX parallel quantitative coding method
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  • All-light analog-digital converter NASSX parallel quantitative coding method

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[0042] Specific implementation

[0043] For the sake of an overview of the invention, certain aspects, advantages, and novel features of the invention are described herein. It should be understood that it is not necessary to achieve all these advantages according to any one specific embodiment of the present invention. Therefore, the present invention is not limited to any specific embodiments disclosed.

[0044] Reference Figure 4 It is a schematic structural diagram of an embodiment of a 3-bit all-optical analog-to-digital converter of the present invention. High nonlinear dispersion shifted fiber γ=12W -1 km -1 . The control light is a stable laser emitted by a fiber laser with a maximum peak power P b (t)=10W, wavelength λ 1 = 1560nm. Detection light pulse λ 2 = 1552nm, T FWHM =2ps, 10GHz / s mode-locked laser emits hyperbolic secant pulse without chirp, pulse width T 0 = T FWHM / 1.76=1.136ps, duty cycle b=(100-1.136) / 100=0.88664, average power P 0 = 2mW. The control light is i...

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Abstract

The invention discloses an all-optical analog-to-digital converter NASSX parallel quantization coding method; an N-bit analog-to-digital converter is designed to stably detect optical pulses and control the optical pulses (analog light) to be input into a coupler [2] (1 multiplied by N) for splitting through a wavelength division multiplexer or a polarization coupler [1] and then to be input into N asymmetrical Sagnac interferometers [3]; a fibre circulator [4] is arranged in front of the reflection port of each asymmetrical Sagnac interferometer [3]; the output port of the fibre circulator [4] is provided with a band pass filter or an analyser [5] which only allows detecting lights to pass. The structure of the invention combined with suitable coupler [2] splitting ratio and the coupler splitting ratio of each asymmetrical Sagnac interferometer [3] leads the detecting lights to output optical gray reversed codes in parallel.

Description

technical field [0001] The present invention relates to the technical field of optical information processing, and in particular to an all-optical analog-to-digital converter NASSX parallel quantization encoding method, that is, a 1×N coupler is used to split beams and access N asymmetric Sagnac interferometers (Asym_SagnacI) Parallel output, based on self-phase modulation (SPM) and cross-phase modulation (XPM) parallel quantization coding to realize 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 sampling technology. The...

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Application Information

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IPC IPC(8): G02F7/00
Inventor 张利勋刘永智刘永李和平
Owner UNIV OF ELECTRONIC SCI & TECH OF CHINA
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