Sensitivity analysis of an HgCdTe based photovoltaic receiver for long-wavelength free space optical communication systems
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Abstract:
We examine theoretically the performance of an Hg0.77Cd0.23Te based p-n photodetector/HFET optical receiver due to its possible application at 10.6 μm free space optical communication system at high bit rate. A rigorous noise model of the receiver has been developed for this purpose. We calculate the total noise and sensitivity of the receiver. The front-end of the receiver exhibits a sensitivity of −45 dBm at a bit rate of 1 Gb/s and −30 dBm at a bit rate of 10 Gb/s, and the total mean-square noise current 〈i n 2〉 = 5 × 10−15 A2 at a bit rate of 1 Gb/s and 〈i n 2〉 = 10−12 A2 at a bit rate of 10 Gb/s, and a 3-dB bandwidth of 10 GHz.
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TN929.1
