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To realize a highly optical-feedback tolerant distributed feedback laser diode (DFB LD), we investigate a design approach combining transfermatrixes and rate-equation analyses. As an important design parameter, we use the C coefficient—the coupling strength between the optical field in the laser cavity and the feedback lightwave—and calculate it numerically. On the basis of the results, a novel DFB-LD structure with high tolerance to optical feedback is proposed and the design parameters are optimized.

Numerical study of a highly optical-feedback tolerant DFB laser with an absorber and a rear reflector using transfer matrixes and rate equations