Hybridly integrated optical transceiver module for access networks

Hybridly integrated optical transceiver modules for 1.3 /spl mu/m wavelength TDM (Time-Division-Multiplexing) bi-directional transmission and 1.3/1.55 /spl mu/m WDM (Wavelength-Division-Multiplexing) bi-directional transmission are demonstrated. Surface mounted laser diode and PIN photodiode are passively aligned to a fiber-embedded optical circuit. The module consists of a transmitting 1.3 /spl mu/m laser diode mounted on a silicon substrate with a V-groove for fiber attachment and a receiving photodiode surface mounted onto a glass substrate which has embedded in it a single mode fiber for input/output. Either power splitting 3 dB filter or wavelength selective WDM filter (1.55 /spl mu/m reflective) is inserted into the embedded fiber which directs the incoming signal light to the photodiode. The optical transceiver characteristics are as follows. The output power was greater than 2 mW for TDM transceiver and 4 mW for WDM transceiver, considering a 20% coupling efficiency to the single mode fiber. The responsivity of the photodiode were 0.97 A/W for WDM transceiver at 1.55 /spl mu/m, and 0.46 A/W for TDM transceiver at 1.3 /spl mu/m. Stable operation characteristics are obtained in the wide temperature range of -40/spl sim/85/spl deg/C.