Injection Laser Modulation At 2 Gbit/s by Monolithic Silicon Multiplexer

Direct laser-diode pulse-code modulation at 2 Gbit/s (NRZ) is performed by a fast Si monolithic integrated bipolar circuit (2.5-µm design rules, p-n-junction isolation, f₁ ≈ 7 GHz at V_CE=1 V). The current-switch output stage of a 4:1-time-division multiplexer IC feeds a modulation current swing of 8 mA into a CSP injection laser biased above threshold. Measured optical responses of the laser are reported.