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28 July 1981 Heterojunction Phototransistors For Fiber-Optic Communications
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Proceedings Volume 0272, High Speed Photodetectors; (1981)
Event: 1981 Los Angeles Technical Symposium, 1980, Los Angeles, United States
The theory of operation of the heterojunction phototransistor is reviewed and the limitations on gain and speed-of-response are examined in the context of fiber-optic systems requirements. The response of the base potential is shown to depend on the input optical power yielding a power dependent gain-bandwidth product, fT. Model calculations assuming an optimized device structure with peak response in the 1. μm - 1.55 μm spectral region are used to demonstrate the consequences of this dependence. The results indicate that the HPT can have sufficient gain and speed-of-response if a dc bias current is used. A comparison of the S/N of the HPT and an APD is presented to clarify system applicability.
© (1981) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
R. A. Milano, P. D. Dapkus, and G. E. Stillman "Heterojunction Phototransistors For Fiber-Optic Communications", Proc. SPIE 0272, High Speed Photodetectors, (28 July 1981);

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