Plastic Packaging of VCSEL Based Fiber Optic Transceivers for PCS Fiber Systems

摘要

We have developed VCSEL based fiber optics transceivers for PCS fiber systems. The PCS fiber has a corediameter of 200μm. The relatively large diameter enables the usage of low cost optical connectors for thefiber link and provides wide alignment tolerances. The measured lateral and longitudinal 3dB couplingtolerances are ±100μm and 500μm, respectively. The VCSEL is integrated with an electronics driver chip andsome passive electronics components on a leadframe structure before plastic encapsulation. The hybridintegration on the leadframe enables batch processing to increase throughput and lower manufacturing cost.No full-hermetic sealing is required for the VCSEL chosen. The variation of optical output power is less than0.2dB from -40oC to 105oC. Eye diagrams show wide open eyes at a data rate of 500Mbit/s at widetemperature range up to 105oC. The technology can go up to data rates in the Gbit/s range, but this iscurrently not required for the target applications. The module is reliable over 1000 temperature cycles from -40℃ to 125℃. For the receiver side we developed high speed MSM photodetectors. The large area MSMphotodetectors relax the coupling alignment tolerance to the core of the optical fiber for 80μm and 4000μm inlateral axis and longitudinal axis, respectively. The MSM photodetector is capable of data rates of 3.2Gb/s. Atthis high speed the sensitivity is better than -18dBm for the MSM photodetector co-packaged with a suitabletransimpedance amplifier (TIA).