Wavelength stabilized single-mode lasers by coupled micro-square resonators

• Published in: IEEE photonics technology letters Vol. 15; no. 3; pp. 377 - 379
• Main Authors: Bach, L., Reithmaier, J.P., Forchel, A., Gentner, J.L., Goldstein, L.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-03-2003; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Confinement; Etching; Geometrical optics; Laser stability; Lasers; Noise levels; Optical coupling; Optical resonators; Optical waveguides; Power generation; Resonators; Ridges; Ring lasers; Spectra; Temperature distribution; Waveguide lasers; Wavelengths
• ISSN: 1041-1135; 1941-0174
• DOI: 10.1109/LPT.2002.807938

Wavelength stabilized single-mode lasers were realized by on-chip coupling of a ridge waveguide laser with two micro-ring resonators. The micro-ring resonators were fabricated by deeply etching to achieve high lateral optical confinement and to allow small ring diameters in the range between 20-60 μm. A square-like ring geometry with 45/spl deg/ facets was used to improve design control and side-wall quality. By using micro rings with two different diameters of 50 and 60 μm, a free spectral range of about 18 nm could be obtained which allow a stable single-mode operation with a side-mode suppression ratio of more than 40 dB and a continuous-wave output power of 30 mW per facet at room temperature.