Overcoming laser diode nonlinearity issues in multi-channel radio-over-fiber systems

Abstract

The authors demonstrate how external light injection into a directly modulated laser diode may be used to enhance the performance of a multi-channel radio over fiber system operating at a frequency of 6 GHz. Performance improvements of up to 2dB were achieved by linearisation of the lasers modulation response. To verify the experimental work a simulation of the complete system was carried out using Matlab.Good correlation was observed between experimental and simulated results.