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The multiple phase shifts technique is introduced into digital concatenated grating to design fiber grating comb filters. Detailed analysis is given for the first time. We find that by increasing the channel multiplication factor and concatenated grating segment number, reflection spectrum can be broadened and channel density can be increased without increasing the sampling period. Comb filters covering...
A bidirectional beam propagation method (BPM) is introduced to describe the relationship between the related parameters and the insertion loss of fiber Fabry-Perot filter. The numerical simulation results indicate that the method can provide a simple and useful way for the device design.
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