关键词：电子信息；半导体；激光器；通信
摘 要：This research investigates the degree to which optical injection improves the communication capability of directly modulated semiconductor lasers and evaluates the suitability of optical injection for telecommunications applications. An end-to-end digital communication system which directly modulates the bias-current of a Fabry–Pérot laser diode is used to investigate the bit-rate-distance improvements achieved using optically injected Fabry–Pérot laser diodes. The injection strength and detuning frequency of the injection signal was varied to determine their impact on the optical communication link’s characteristics. This research measured a 25 fold increase in the bit-rate-distance product using optical injection locking as compared to the injected laser’s free-running capability.A 57 fold increase was measured in the bit-rate-distance product when signal power is considered in a power-penalty measurement. This increased performance is attributed to the injected signals tolerance to dispersion given its reduced linewidth and chirp. This work also investigates the suitability of optical injection for radio over fiber applications using the period-one dynamic of optical injection. The all-optically generated, widely tunable microwave subcarrier frequency, well above the 3-dB cutoff frequency of the laser’s packaging electronics, is modulated with the same baseband electronics. This optically carried, ultra-wide spread spectrum signal is transported 50km through standard single-mode fiber. After detection with a high-speed photodetector followed by removal of the baseband modulation component, the resultant signal was found to be suitable for broadcasting with an antenna or added to a frequency division multiplexed channel.