2017 Volume 6 Issue 4 Pages 154-159
We propose a novel multi-level pre-equalizer composed of multiple binary analog finite impulse response (FIR) filters. The performance was investigated using numerical simulation of a 20-Gb/s four-level pulse-amplitude-modulation (4-PAM) multi-mode fiber (MMF) transmission system. The analog FIR filters were designed using 28 nm fully depleted silicon on insulator (FD-SOI) based complementary metal-oxide-semiconductor (CMOS) circuits. The simulated CMOS circuits successfully compensated the multi-level signals distorted by modal dispersion. The error vector magnitude (EVM) of the transmitted 4-PAM signals was improved from 40% to 9%. The proposed design scheme will enable cost-effective, low-power analog FIR filters for multi-level pre-equalization.