Abstract
Improved longitudinal-mode selectivity and wavelength control are achieved in Fabry-Perot lasers through the use of resonant coupled cavities (C3 lasers). In this paper, we demonstrate what we believe to be the first coupled-cavity ring diode lasers. These devices have a dual ring structure with one ring resonator located within the cavity of a second ring and direct-coupled to it by waveguide Y-junctions. The inner ring resonator acts as a wavelength-selective filter, controling the light transmission around the outer ring cavity. As a result, the light-vs-current (L-I) curve shows strong resonance peaks. At resonance, the coupled-cavity ring lasers operate single-frequency with side-mode rejection (SMR) ratios up to 33 dB and output powers up to 8 mW.
© 1992 Optical Society of America
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