1.回應度，為什么信號速率越高，PD回應度越低？
Currently, the industrial 10G avalanche photodiode (APD) is a normal incidence type whose responsivity is approximately 0.9 A/W , and the multiplication gain is about 8. When increasing to 25G, the typical responsivity and gain decrease to about 0.6 A/W and 5 (limited by the gain–bandwidth product). The best academic result for a III-V based 50G APD is 0.5 A/W responsivity at 35 GHz with M=3 [9]. The Si-Ge based APD has better performance and the best case, using waveguide structure, was shown at OFC 2019, with 0.36 A/W responsivity and M=10 at 36 GHz [10].
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