| 摘要 |
<p>A semiconductor ring-type optical device (30) having an optical cavity with at least one partially transmitting facet (48,50,52) which serves as an emergence region for light propagating within the optical cavity. The cavity has its upper surface coated with metal to provide a contact for applying a bias voltage across the device. The conductive layer on the upper surface of the laser is divided into at least two segments (72,74) so as to provide two separate electrodes to allow application of separate voltages (80,82) to the two segments. Variations in the voltage applied to the two electrodes allows tuning of the laser output wavelength.</p> |
