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Balanced photodetector (BPD) is an important component for high-speedcoherent receiver. Optimization strategy of waveguide-based multi-quantum well(MQW) BPDs, operating at 1550 nm is demonstrated on generic InP platform.Design parameters of BPD are optimized towards achieving the highest bandwidthfor a responsivity through an algorithm based on Particle Swarm Optimization(PSO). We do so by establishing an equivalent circuit model of BPD andanalyzing its opto-electronic transfer function through numerical modelling. Weaddress the major bottlenecks of high-speed BPDs: transit time of generatedcarriers and RC loading in our model. The algorithm is able to provide multiplecombinations of design parameters with the same output characteristics. Designmethodology to integrate laser with optimized BPD is presented to successfullyimplement coherent receiver.

Optimization of Balanced Detector for Coherent Receiver on Generic InP Platform by PSO