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A coding device and method for soliton self-frequency shift all-optical analog-to-digital conversion

An optical coding and coding technology, used in optical analog/digital converters, optics, nonlinear optics, etc., can solve the problems of difficult coding bit expansion, chaotic coding timing, and complex system structure. Solve the effect of insufficient working band, small volume and weight

Active Publication Date: 2019-12-06
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to propose a soliton self-frequency shifting all-optical system for the problems of the existing optical coding, such as easy confusion of coding timing, narrow working band, difficult expansion of coding bits, complex system structure and poor adjustability. Coding device and method for analog-to-digital conversion

Method used

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  • A coding device and method for soliton self-frequency shift all-optical analog-to-digital conversion
  • A coding device and method for soliton self-frequency shift all-optical analog-to-digital conversion
  • A coding device and method for soliton self-frequency shift all-optical analog-to-digital conversion

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Embodiment

[0047] like figure 2 As shown, take Sagnac ring comb filter array with 4-bit binary code as an example.

[0048] In the present embodiment, the Sagnac ring comb filter array is composed of four Sagnac ring comb filters with periods of 10nm, 20nm, 30nm, and 40nm, and the birefringence of the polarization-maintaining fiber used is B=1.55×10 -6 , the lengths of polarization-maintaining fibers in the four Sagnac rings are 155m, 77.5m, 38.75m, and 19.375m, respectively. The optical pulse input to the Sagnac ring comb filter array is a hyperbolic secant pulse after soliton self-frequency shift optical quantization, the pulse width is 360fs, and the central wavelength range is 1550nm-1700nm. The input light pulse first passes through the dispersion compensating fiber 1 with a length l=10m and a dispersion value D=-220ps / nm / km to compensate the time delay after light quantization. Then, the light pulse is divided into 4 paths by 1×4 coupler 2, and then enters four Sagnac ring-comb ...

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Abstract

The invention relates to the field of optoelectronic technology, in particular to an encoding device and method for soliton self-frequency shift all-optical analog-to-digital conversion. The device of the present invention includes dispersion compensating optical fiber, which is connected with 1×N coupler, and the 1×N coupler is connected with filter array, and the filter array is composed of N-way Sagnac ring-comb filters. The invention utilizes the dispersion compensating optical fiber to perform delay compensation on the optical pulses with different central wavelengths after the soliton self-frequency shift optical quantization, so as to ensure the timing correctness of the encoding; by rationally designing the birefringence size of the polarization-maintaining optical fiber, the adjacent Sagnac ring comb filtering can be ensured The period of the detector is multiplied, and the wavelength of the transmission peak is controlled by adjusting the polarization controller to realize the N-bit binary code output based on optical comb filtering. The invention has the advantages of large working wavelength range, strong tunability, simple structure, small volume and weight, low cost, etc., and significantly improves the coding accuracy and flexibility.

Description

technical field [0001] The invention relates to the field of optoelectronic technology, in particular to an encoding device and method for soliton self-frequency shift all-optical analog-to-digital conversion. Background technique [0002] Analog-to-digital converters are used to convert continuous analog signals into discrete digital signals. They are key devices in information processing systems and have important applications in high-speed broadband communication systems, radar signal processing, signal monitoring and processing, and other fields. Currently, electronic ADCs are the most widely used, but due to the physical limit of carrier mobility, their analog bandwidth and sampling rate are limited, and due to factors such as sampling time jitter, comparator uncertainty, transistor threshold mismatch, etc. , each time the sampling rate doubles, the number of effective digits drops by one (R.H.Walden, Analog-to-digital converter survey and analysis, IEEE.J.Select.Areas ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F7/00G02F1/35
CPCG02F1/353G02F7/00
Inventor 王舒冰彭迪张旨遥张戌艳李和平刘永
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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