CMOS Linear Laser Driver for Intermediate Frequency over Fiber (IFoF) Links

Abstract

The main objective of the proposed linear laser driver (LLD) is to reduce signal distortion in an analog direct modulation laser configuration used for intermediate frequency over fiber links. This work draws on an open-loop configuration featuring two differential pair blocks in a cascade arrangement to achieve a bandwidth measurement of 415 MHz at the half-power point, a total harmonic distortion of 4.57% for a fundamental frequency of 100 MHz, and an amplitude of 100 mVpp. The LLD provides a gain of 12.3 dB for a differential output and an output impedance of 46 Ω. The design, layout, and integration correspond to the process design kit for TSMC 65-nm CMOS technology. Experimental results show the advantage over other previously reported laser drivers.

A CMOS Current-Mode Vertical-Cavity-Semiconductor-Emitting-Laser Diode Driver for Short-Range LiDAR Sensors

“…Ref. [ 14 ], on the other hand, demonstrated a CMOS linear VCSEL driver for an intermediate frequency over fiber links, where a large bias current of 10 mA was required. In this work, we proposed a novel single-ended CMVD with stable bias currents by exploiting regulated cascode current-mirror circuitry and with a novel CSL circuit to provide variable modulation currents up to 10 mA pp .…”

“…Nonetheless, it is crucial to note that the adoption of common-anode VCSEL diodes mandates an additional supply voltage, which is troublesome in practice. Hence, common-cathode VCSEL diode drivers are often preferred due to their compatibility with the prevailing requirements and constraints [ 10 , 11 , 12 , 13 , 14 ].…”