Characterization of Fabry–Perot laser diodes injection locked by spectrum sliced ASE noise in WDM-PON

We experimentally evaluate the performance of Fabry–Perot laser diodes (FPLDs) injection locked by spectrum sliced amplified spontaneous emission (ASE) noise for transmission at 1.25 Gb/s. We characterize the injection locked FPLDs in terms of front-facet reflectivity, operation temperature, bias current and injection locked mode location. Experiment results show that the FPLD performance is strongly dependent on the front-facet reflectivity. Therefore a reasonable range of front-facet reflectivity for FPLDs is recommended. Operating the lasers at low temperature has better receiver sensitivity, while operating at high temperature has slightly broader operation range for injected ASE power. There is an optimal bias for a given injection power and the operation range for bias current is increased for higher injection power. Injection locked mode location also affects the performance of FPLDs.