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25 February 2020 Geometry optimization of unidirectional integrated ring laser
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Ring lasers, evanescently coupled to an adjacent optical waveguide, are essential components for the upcoming generation of integrated sources. In an ideally symmetric resonator, emission occurs from the both clockwise and counter-clockwise directions, resulting in a potential waste of emitted optical power, while unidirectional emission has been reported in different configurations, for example when asymmetric external reflectivities are used for the coupling waveguide. In the integrated form, a common approach consists in the inserting an S-bend waveguide in the ring, in such a way that the field propagating in the direction that we want to suppress is reinjected in the other direction. The S-bend waveguide must be carefully designed to reduce optical losses and to ensure a sufficient suppression of the undesired field. Using 2D finite- difference time-domain simulations performed with Synopsys RSoft©, we report a systematic analysis of the racetrack geometry of a 86.8 μm long microring laser including an inner S-waveguide, and we maximize the unidirectionality of the ring laser, scanning the gap distance between external racetrack resonator and S-bend waveguide. The results of this numerical analysis can be finally used to generate the mask layout of the improved unidirectional ring laser, targeting a Process Design Kit of choice, taking advance of the integration of RSoft with the software OptoDesigner.©
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Giuseppe Giannuzzi, Enrico Ghillino, and Paolo Bardella "Geometry optimization of unidirectional integrated ring laser", Proc. SPIE 11283, Integrated Optics: Devices, Materials, and Technologies XXIV, 112832H (25 February 2020);

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