Characteristics of linewidth narrowing of a 1.5 μm DFB laser with a short GRIN-rod external coupled cavity

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Abstract
A short GRIN-rod is coupled to a 1.5 μm InGaAsP DFB laser to achieve a linewidth reduction from 34 MHz to 1.5 MHz at 2.5 mW. Characteristics of linewidth narrowing with respect to the displacement of the GRIN-rod, the laser temperature and the driving current are presented.