Abstract
In this paper, a 12.5-Gb/s optical transmitter is implemented using 0.13-<TEX>${\mu}m$</TEX> CMOS technology. The optical transmitter that we constructed compensates temperature effects of VCSEL (Vertical cavity surface emitting laser) using auto-power control (APC) and auto-modulation control (AMC). An external monitoring photodiode (MPD) detects optical power and modulation. The proposed APC and AMC demonstrate 5<TEX>$\sim$</TEX>20-mA of bias-current control and 5<TEX>$\sim$</TEX>20-mA of modulation-current control, respectively. To enhance the bandwidth of the optical transmitter, an active feedback amplifier with negative capacitance compensation is exploited. The whole chip consumes only 140.4-mW of DC power at a single 1.8-V supply under the maximum modulation and bias currents, and occupies the area of 1280-<TEX>${\mu}m$</TEX> by 330-<TEX>${\mu}m$</TEX> excluding bonding pads.
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