20‐gb/s optical transmitter and receiver using sige integrated circuits

A 20-Gb/s optical transmitter and a receiver with 3R functions is developed for ultrahigh-speed optical communication systems for future multimedia communications. Integrated circuits (ICs), such as preamplifiers, differential amplifiers, D-type flip-flop (D-F/F), and selectors with a 20-Gb/s operating speed have been developed using the SiGe process as key components of the optical transmitter and receiver. A waveguide pinphotodiode with very low capacitance is used to realize a wide bandwidth. A front-end module with a bandwidth of 16 GHz and a gain of 43 dBQ has been achieved using the preamplifier IC and the waveguide 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.

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