A 4-CH 10-Gb/s CMOS VCSEL driver array with adaptive optical power control

In this paper, a 4-channel 10-Gb/s VCSEL driver array with adaptive optical power control is implemented using 0.13-¿m CMOS technology. The proposed VCSEL driver compensates temperature effects of VCSEL using auto-power control (APC) and auto-modulation control (AMC). External monitoring photodiode (MPD) helps the detection of optical power and modulation. The proposed APC and AMC demonstrates 5~20-mA of bias-current control and 5~20-mA of modulation-current control, respectively. To enhance the bandwidth of the optical transmitter, active feedback amplifier with negative capacitance compensation is exploited. The whole chip consumes only 140-mW of DC power at a single 1.8-V supply under the maximum modulation and bias currents, and occupies the area of 1270-¿m by 1080-¿m excluding bonding pads.