Linearization of a Laser/Optical Communication Link

Abstract

A predistortion linearizer for improving the harmonic distortion (HD) and intermodulation distortion (IMD) of an AT&T 215-Type Astrotec Laser Module is presented. This linearizer employs a single passive GaAs MESFET nonlinear element. Improved laser linearity is important for CATV applications. When the linearizer was mated with the laser, a reduction in IMD of 14 dB was achieved.