120-Gb/s multiplexing and 110-Gb/s demultiplexing ICs

InP HBT ICs capable of 120-Gb/s multiplexing and 110-Gb/s demultiplexing operation have been developed. They feature a direct-drive series-gating configuration selector, an asymmetrical latch flip-flop, and broadband impedance matching with inverted microstrip lines. Their input sensitivity is less than 100 mV/sub pp/, and the output swing is more than 400 mV/sub pp/. To the best of our knowledge, this result is the highest data rate operation reported for electronic ICs. Moreover, an error-free multiplexing and demultiplexing operation at 100 Gb/s was demonstrated.