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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.
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...
Semiconductor ring lasers (SRL) are interesting devices from the technological point of view because they do not require cleaved facets or gratings in order to achieve the necessary optical feedback for lasing. In SRL, light extraction is accomplished via evanescent coupling from the waveguide into several output waveguides.
We fabricated micro-sized semiconductor ring and disk lasers. Devices operate continuous wave down to a radius of 7 mum, with robust directional switching exhibited to a radius of 30 mum. Additionally, polarisation rotation is reported.
A monolithic semiconductor ring laser (SRL) is demonstrated to operate as an all-optical flip-flop that is triggered by optical pulses of 400 ps and 5 ps duration, showing a response time of 130 ps.
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