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An optical receiver for 40 Gbit=s communication systems with 8274 V=W conversion gain and 950 mV p-p limiting differential output is reported. A back-to-back sensitivity of À9.4 dBm at a bit error rate of 10 À12 was observed for a 2 31 À 1 pseudorandom binary sequence. The receiver incorporates an InP based pin diode, a transimpedance amplifier and a limiting amplifier. This is the largest conversion gain with high sensitivity reported for 40 Gbit=s receivers without optical amplification.

A 40 Gbls time-division-multiplexing (TDM) system transmitter and receiver with 4-channel 10 Gb/s interface is presented. InP DHBT IC technology is used to implement the complete chipset ( 4:l multiplexer with VCO /clock multiplication unit, modulator driver, transimpedance amplifier, limiting amplifier and 1:4 demultiplexer with clock and data recovery). A 2.26 km long transmission ex eriment was performed using the system with 40 Gb/s, 2' -1, NRZ PRBS. The transmit eye exhibits a high extinction ratio >12.5 dB with 1 ps added RMS jitter and 4 dbm output power.Receive sensitivity is better than -7.8 dBm with 0.22 dB dispersion penalty. P

A time-division-multiplexing (TDM) system transceiver with 4–channel 10 Gb/s interfaces to achieve 40 Gb/s non-return to zero (NRZ) transmission is presented. The front-end components are implemented in an indium phosphide double hetero-junction bipolar transistor (InP DHBT) technology. They include a 4:1 multiplexer with a voltage controlled oscillator and clock multiplication unit, modulator drivers for electro-absorption and differential lithium-niobate modulators, trans-impedance amplifier, limiting amplifier and 1:4 demultiplexer with clock and data recovery circuit. The transceiver was used to teat optical transmission over a 2.26 km link with a 40 Gb/s, 231-1 pseudo-random bit sequence (PRBS) data. The transmitter achieves better than 12.9 dB extinction ratio, 1 ps added root mean square (RMS) jitter and 4 dBm output power. Without any optical amplification the receiver achieves -9.1 dBm back to back sensitivity at a bit error rate (BER) of 10-12 and a high dynamic range of 12.5 dBm.