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Stable and widely tunable dual-wavelength continuous-wave operation of a semiconductor laser in a novel Fabry-Perot grating-lens external cavity

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2 Author(s)
Lee, Ka-Suen ; Dept. of Electron. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong ; Shu, C.

We propose and experimentally demonstrate an external-cavity configuration for a 1.5-μm InGaAsP semiconductor laser to generate tunable dual-wavelength optical output over a wavelength range of 60.8 nm. The Fabry-Perot (FP) grating-lens external cavity consists of a FP filter, a diffraction grating, a converging lens, and a totally reflecting mirror. The dual wavelength CW output has a spectral separation of 0.9 nm and a side-mode-suppression ratio of over 25 dB throughout the tuning range. The relative intensity variation between the two lasing wavelengths is smaller than 1.2 dB without any observable mode hopping

Published in:

Quantum Electronics, IEEE Journal of  (Volume:33 ,  Issue: 10 )