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

A digital converter, quantization and encoding technology, 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 NSSX parallel quantitative coding method
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  • All-light analog-digital converter NSSX parallel quantitative coding method

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[0042] specific implementation

[0043] For purposes of summarizing the invention, certain aspects, advantages and novel features of the invention are described herein. It should be understood that not necessarily all such advantages can be achieved in accordance with any one particular embodiment of the invention. Accordingly, the invention is not to be limited to any particular embodiment disclosed.

[0044] refer to Figure 4 It is a schematic structural diagram of an embodiment of the 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 the stable laser emitted by the fiber laser, the maximum peak power P b (t) = 10W, wavelength λ 1 = 1560nm. Probe light pulse λ 2 =1552nm, T FWHM = 2ps, 10GHz / s mode-locked laser emits a chirp-free hyperbolic secant pulse with a pulse width T 0 =T FWHM / 1.76=1.136ps, duty cycle b=(100-1.136) / 100=0.98864, average power P 0 = 2mW. Th...

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Abstract

The invention relates to an all-optical analog-to-digital converter NSSX parallel quantization coding method; an N-bit all-optical analog-to-digital converter is designed to stably detect optical pulses and to 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 respectively input into N symmetric Sagnac interferometers [3] to be output in parallel; the position of each symmetric Sagnac interferometer [3] close to the 3dB coupler is provided with an attenuator or an optical amplifier [4]; a fibre circulator or a separator [5] is arranged in front of the reflection port; the output port can be a transmission port or the reflection port of the Sagnac interferometer; the output port is provided with a band pass filter or an analyser [6] which only allows detecting lights to pass. The structure of the invention combined with suitable coupler [2] (1 multiplied by N) splitting ratio and the attenuator or the optical amplifier [4] coefficient 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, in particular to an all-optical analog-to-digital converter NSSX parallel quantization encoding method, that is, N symmetrical Sagnac interferometers (SagnacI) using 1×N coupler beam splitting input arrays Parallel output, N-bit all-optical analog-to-digital converter based on parallel quantization and encoding of self-phase modulation (SPM) and cross-phase modulation (XPM) principles. 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 k...

Claims

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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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