Hybridly integrated optical transceiver module for access networks

Hybridly integrated optical transceiver modules for 1.3 μm wavelength TDM (Time-Division-Multiplexing) bi-directional transmission and 1.3/1.55 μm 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 μm 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 μm 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 μm, and 0.46 A/W for TDM transceiver at 1.3 μm. Stable operation characteristics are obtained in the wide temperature range of -40~85°C