Norihiro Iwai, Maiko Ariga , Yoshihiko Ikenaga , Hiroaki Suzuki , Kevin Nishikata , Noriyuki Yokouchi and Akihiko Kasukawa
The explosive growth of the Internet in recent years has given rise to a need for higher data transmission speeds. And the rapid proliferation of electronic appliances raises the hope for greater proliferation of short-haul data communications linking various appliances in the home. Against this background an 850-nm vertical-cavity surfaceemitting laser (VCSEL) transmitter optical sub-assembly (TOSA), which can operate at 4.25 Gbps, is the target of R&D activity in institutions around the world as a light source for the next generation of Fiber Channel. Accordingly we have optimized the structure of a VCSEL chip, fabricated a TOSA, and evaluated its characteristics. This has enabled us to fully satisfy specifications with respect to 4.25-Gbps operation, static characteristics, temperature characteristics, and reliability.