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In this paper, we discuss a dual-step evanescently coupled photodiode (PD), which is composed of an improved evanescently coupled optical waveguide and a uni-traveling-carrier PD (UTC-PD). The hitherto serious dependence of the responsivity on the coupling length, which is determined by the cleaving process, or the necessity of a long (~ 700 mum) passive waveguide with a complex tapered structure,...
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