Very high-speed light-source module up to 40 Gb/s containing an MQW electroabsorption modulator integrated with a DFB laser

Abstract

A very high-speed integrated light source up to 40 Gb/s has been developed. The InGaAsP MQW integrated light source consists of an multiple-quantum-well (MQW) electroabsorption (EA) modulator and a distributed-feedback (DFB) laser. After optimizing the structure of the integrated modulator, the device is packaged in a compact module with a single-mode fiber (SMF). While the DFB laser is injected with a constant current, the integrated MQW electroabsorption modulator is driven with a 40-Gb/s electrical NRZ signal. A clearly-open eye diagram is observed in the modulated light from the modulator. Further, a receiver sensitivity of -27.2 dBm at 10/sup -9/ is experimentally confirmed in bit-error-rate (BER) performance. Highly resolved optical short pulse is also generated at a repetition rate of 40 GHz using the new light-source module.