Mode locking of semiconductor laser with curved waveguide and passive mode expander

Williamson, C. A.; Adams, M. J.; Ellis, A. D.; Borghesani, A.
January 2003
Applied Physics Letters;1/20/2003, Vol. 82 Issue 3, p322
Academic Journal
Active mode locking is reported for a 1.55 μm semiconductor laser with a curved waveguide and passive mode expander, placed in a wavelength tunable external cavity. One facet with a very low reflectivity of 8 × 10[SUP-6] is achieved through a curved active region that tapers into an underlying passive waveguide, thus expanding the mode to give reduced divergence. 10 GHz pulses of 3.1 ps duration have been generated, with a linewidth of 0.81 nm.


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