Abstract
A directly modulated semiconductor laser when subject to optical injection locking is experimentally investigated. The modulation bandwidth is observed to increase when the laser is injection-locked to an external optical signal. It enhances with increasing injection strength and positively increasing detuning frequency. A more than three fold of bandwidth enhancement is observed experimentally. The frequency chirping is observed to reduce in the injection-locked laser system. It reduces significantly at low modulation frequency and increases with modulation frequency, approaching to that of the laser in free-running condition at high modulation frequency. More importantly, simultaneous bandwidth enhancement and chirp reduction is experimentally achieved.
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