Continuously tunable thin active layer and multisection DFB laser with narrow linewidth and high power

The feasibility of a wavelength tuning range of 1 nm with the spectral linewidth around 2.5 MHz at about 10 mW is demonstrated in thin-active-layer and multisection 1.5- mu m distributed feedback (DFB) lasers with long cavities. The tuning range is widened to over 3 nm by combining electric and thermal tuning effects. A flat FM response with an efficiency of over 1 GHz/mA from low to high (around 1 GHz) frequency is also achieved.<
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