Abstract: Waveguide npin heterojunction phototransistors (HPTs) are investigated for analog fiber-optic link applications. The device is fabricated on a semi-insulating InP substrate with an integrated CPW transmission line. At low optical power, an incremental DC responsivity of approximately 16 A/W is observed at 1.3 $mu@m wavelength. It is demonstrated that the HPT responsivity at RF frequencies can be increased through a second optical beam. Signal mixing experiment using two RF-modulated optical beams shows that the waveguide npin HPT can be used as an effective integrated photodetector/mixer for RF signal up- and down-conversion. !9
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机译：摘要：研究了波导npin异质结光电晶体管（HPT）在模拟光纤链路应用中的应用。该器件是在具有集成CPW传输线的半绝缘InP基板上制造的。在低光功率下，在1.3μm的波长下观察到大约16 A / W的增量DC响应度。已经证明，可以通过第二光束来增加RF频率下的HPT响应度。使用两个RF调制光束的信号混合实验表明，npin HPT波导可以用作RF信号上变频和下变频的有效集成光电检测器/混频器。 ！9
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