시분할 센싱 기법 기반의 출력 안정화를 위한 10 Gb/s 4채널 VCSELs 드라이버의 구현

Abstract

We implemented a 10 Gb/s 4-channel vertical cavity surface emission lasers (VCSEL) driver array in a 0.13 μ m CMOS process technology. To enhance high current resolution, power dissipation, and chip space area, digital APC/AMC with time division sensing technology is primarily adopted. The measured -3 dB frequency bandwidth is 9.2 GHz; the small signal gain is 10.5 dB; the current resolution is 0.01 mA/step, suitable for the wavelength operation up to 10 Gb/s over a wide temperature range. The proposed APC and AMC demonstrate 5 to 20 mA of bias current control and 5 to 20 mA of modulation current control. The whole chip consumes 371 mW of low power under the maximum modulation and bias currents. The active chip size is 3.71 x 1.3 mm2.