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We experimentally and theoretically study coupled semiconductor ring lasers. We report on the destabilization of unidirectional operation for large coupling strengths and the appearance of a coupling-induced bidirectional state, both undesirable for optical memory operation.
We demonstrate electrically-pumped room-temperature continuous-wave lasing in InP-based micro-disc lasers with threshold current of 6.5mA. A non-concentric hole inside the disc is used to extract the light and control the lasing mode.
A new snail laser geometry is modelled and presented, exhibiting stable, unidirectional lasing at both 1550 nm and 808 nm. We have calculated the fundamental mode thresholds and output power for Semiconductor Snail Laser (SSL) as a function of device parameters, i.e. coupler efficiency and output facets reflectivities. The coupler efficiency is the fraction of light transmitted between the waveguides...
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