Bandwidth optimization and design method for optical frequency code chips of spectral amplitude encoding/decoding system
A technology of amplitude coding and spectrum, applied in the direction of optical demodulation, optics, instruments, etc., can solve the problems of low detection signal-to-noise ratio, signal power difference, large communication bit error rate, etc.
Inactive Publication Date: 2014-12-10
CHANGCHUN UNIV OF SCI & TECH
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Therefore, assigning sub-bands to each optical frequency chip by evenly dividing the entire optical frequency band of the wide-spectrum optical signal will lead to a large difference in the actual signal power allocated to different optical frequency chips, which may cause signal power The detection signal-to-noise ratio of the sub-channel corresponding to the smaller optical frequency chip is lower, resulting in a larger communication bit error rate
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[0025] The present invention will be further described below in conjunction with the accompanying drawings. Such as figure 1 As shown, the spectral amplitude encoding system consists of a wide-spectrum light source 101, a convex lens 102, a convex lens 110, a spectral grating 103, a reflector 107, a linear array electro-optic liquid crystal spatial light modulator 104, a reflective mirror 108, a spectral grating 105, a convex lens 111, and a convex lens 106 , encoding control and drive module 109; the optical signal A001 output by the wide-spectrum light source 101 is transformed by the convex lens 102 and the convex lens 110, and then incident on the spectral grating 103, and the spectral grating 103 splits the optical signal A001, so that the optical signals of different frequencies The components are separated in space, and then incident on the linear array electro-optic liquid crystal spatial light modulator 104 after being reflected by the reflector 107, and the optical s...
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The invention discloses a bandwidth optimization and design method for optical frequency code chips of a spectral amplitude encoding / decoding system, belonging to the field of free space optical communication technologies. According to the bandwidth optimization and design method, laser signals sent by the spectral amplitude encoding system are received and recorded firstly by using a linear-array photoelectric detector, a data acquisition card and a computer, and the number of the optical frequency code chips and the sub-optical frequency band distributed for each optical frequency code chip are then calculated and optimized according to output signal intensity histograms of detection units of the linear-array photoelectric detector. The detection signal-to-noise ratio sizes of sub-channels corresponding to the optical frequency code chips can be furthest guaranteed to be equal by using the bandwidth optimization and design method, so that the waste of the output power of a wide-spectrum light source is avoided, and the performance of a free space optical communication system which uses a spectral amplitude encoding / decoding method is improved.
Description
technical field [0001] The invention belongs to the technical field of free space optical communication, and relates to an optical frequency chip bandwidth optimization design method of a spectrum amplitude encoding / decoding system. Background technique [0002] A paper titled "Suppression of Intensity Fluctuations in Free Space High-Speed Optical Communication based on Spectral Encoding of a Partially Coherent Beam" in volume 280 of "Optics Communications" in 2007 describes a kind of optical communication for free space Spectral amplitude encoding optical system. When discussing the bandwidth design of optical frequency chips, this paper considers the way of allocating the same bandwidth for each optical frequency chip, that is, evenly divides the entire optical frequency band of the wide-spectrum optical signal, and assigns A chip allocates one sub-optical frequency band. The frequency spectrum of the output signal of the actual broadband light source is often not even...
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IPC IPC(8): H04B10/11G02F2/00
Inventor 陈纯毅杨华民娄岩佟首峰
Owner CHANGCHUN UNIV OF SCI & TECH