20-GB S OPTICAL TRANSMITTER AND RECEIVER USING SIGE INTEGRATED-CIRCUITS/

A 20-Gb/s optical transmitter and a receiver with 3R functions is deve loped for ultrahigh-speed optical communication systems for future mul timedia communications. Integrated circuits (ICs), such as preamplifie rs, differential amplifiers, D-type flip-flop (D-F/F), and selectors w ith a 20-Gb/s operating speed have been developed using the SiGe proce ss as key components of the optical transmitter and receiver. A wavegu ide pin-photodiode with very low capacitance is used to realize a wide bandwidth. A front-end module with a bandwidth of 16 GHz and ii gain of 43 dBQ has been achieved using the preamplifier IC and the waveguid e pin-photodiode (PD). A 20-Gb/s optical transmitter and a receiver is fabricated using the developed SiGe. ICs, high-speed optical devices, and a receiver sensitivity of -23 dBm are obtained.