Efficient semiconductor ring lasers made by a simple self-aligned fabrication process

Monolithically integrated twin ring diode lasers for rotation sensing applications

“…This value is quite reasonable, being at a level of 50 A/cm 2 per single stack of QDs, and significantly smaller than the best reported result of 1100 A/cm 2 for QW ring lasers with similar ridge-waveguide structure [8]. Fig.…”

Ring Resonator Lasers using Passive Waveguides and Integrated Semiconductor Optical Amplifiers

“…7, as low as 25 mA. The kinks in the L-I curve of the ring laser are accompanied by mode hops and can be explained by coupled cavity effects, the second cavity being formed by the output path, which includes the MMI coupler [8]. The kinks have also been observed for fabricated ring lasers, which do not have an antireflection coating on the facets of the outcoupling waveguides.…”

InGaAs/GaAs quantum well circular ring lasers fabricated by laser direct writing and pulsed anodic oxidation

“…They are promising candidates for wavelength filtering, unidirectional traveling wave operation and multiplexing/ demultiplexing applications [8][9][10][11][12]. Several examples of fabrication of SRLs with different cavity geometries have been reported, such as circular [13,14], racetrack [15,16], square [11,17], and triangular [18].…”