A tunable single-mode laser is obtained by using a weakly coupled cavity structure involved in a coaxially packaged Fabry–Perot laser diode. The cleaved end facet of the coupling fiber becomes an optical reflector and forms an external cavity with a laser facet. The single-mode oscillation condition is controlled and stabilized by tuning the operating temperature. The tuning range is about $10\mathrm{nm}$ with the side-mode suppression ratio of more than $27\mathrm{dB}$ when the temperature changes from $11.5°\mathrm{C}$ to $25°\mathrm{C}$ . Direct modulation characteristics were investigated, and our results show that a shorter external cavity can bear deeper modulation depth.

© 2006 Optical Society of America

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