Spot-Size-Converter Integrated Semiconductor Optical Amplifiers for Optical Switching Systems

摘要

Spot-size-converter integrated semiconductor optical amplifiers have been developed as gate elements for opti- cal switch matrices. An S-shape waveguide has been introduced to prevent re-coupling of unguided light to the output fiber. An angled-facet structure effectively suppressed light reflection at the end facets. Consequently, a high extinction ratio of 70 dB and a high fiber-to-fiber gain of 20 dB were achieved. Sufficient optical coupling characteristics to a flat-ended single-mode fiber with a coupling loss of 3.5 dB were also demonstrated.