Power dependence of the injection lock band of angled-grating distributed feedback lasers

Experimental measurements of the injection lock band of an angled-grating d istributed feedback laser have been performed systematically as a function of the unlocked slave laser power. Fringe visibility measurements were used to ascertain the quality of the lock between the master and slave laser as a function of master coupling level and frequency detuning. Experimental d ata show increasing spectral instabilities under optical injection as the s lave laser power is increased, resulting in the stable portion of the lock band decreasing in width. (C) 2000 American Institute of Physics. [S0003-69 51(00)04623-4].