622-Mb/s Bidirectional SFP Optical Transceiver Using an Integrated WDM Optical Subassembly

The 1.3/1.55-$\mu{\hbox{m}}$ bidirectional small form pluggable (SFP) optical transceiver with an integrated wavelength division multiplexing (WDM) subassembly using accurate ceramic blocks has been developed. The WDM subassembly on which a laser diode, a receiver photodiode, a WDM filter, and two microlenses are integrated is only ${\hbox{2.0}}\times {\hbox{2.1}}\times {\hbox{0.6}}\ {\hbox{mm}}^{3}$ in size and inserted in a TO-CAN package. The SFP transceiver coupled with single-mode fiber has been operated at a 622-mb/s data rate. The transmitted optical output power is $-$2.8 dBm and the measured value of sensitivity is $-$32 dBm at 10$^{-10}$ bit-error rate.