A compact coaxial-type optical transceiver module has been developed without using a conventional 3 dB optical coupler. This transceiver is composed of a newly designed half-transmittance photodiode (HT-PD) and a 1.3-\mum-MQW-LD. An HT-PD is used both as a photodetector and as a window for LD light. Fiber output power of 1.15 mW at the drive current of 26 mA and responsivity of 0.48 A/W at the reverse-voltage of 5 V were obtained. Temperature dependence of responsivity is also reported.
Yoshiki Kuhara, Hiromi Nakanishi, Yasushi Fujimura, Hitoshi Terauchi, Shigeru Inano, and Akira Ishida, "A Compact Coaxial-Type Optical Transceiver Module Using a Half-Transmittance Photodiode for TCM Optical Access Networks," J. Lightwave Technol. 16, 251- (1998)