Device and method for recognizing spectrum amplitude code mark through frequency sweeping coherent detection
A spectral amplitude code and optical marking technology, applied in the field of optical communication, can solve the problems of difficult implementation, complicated design and operation of marking identification unit, large optical loss, etc., and achieves reduction of system complexity and implementation cost, and strong practical operability. , the effect of eliminating the splitting loss
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[0025] Below according to accompanying drawing and example the present invention will be described in further detail:
[0026] Such as figure 1 Schematic diagram of the frequency-sweeping coherent detection SAC marker recognition unit shown. After the SAC optical marker and the frequency-sweeping local oscillator light source are mixed, the coherent detection technology and the balanced detection receiver are used to realize the identification of the SAC marker.
[0027] Based on the frequency-domain coded SAC optical marker, the present invention uses 4 codewords (f 1 , f 2 , f 3 , f 4 ) "1010" SAC light mark as an example (such as figure 1 (a) shown). The linearly swept LO light source covers all available frequencies (f 1 ~ f 4 ), and the transfer function is f LO (t n ) = f n (where n=1, 2, 3, 4) (such as figure 1 (b) shows the light source signal). After the above two optical signals are mixed by a 3dB coupler, the mixed signal is then filtered by a balanced ...
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