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Spot-Size-Converter Integrated Semiconductor Optical Amplifiers for Optical Switching Systems
Takemasa TAMANUKI Shotaro KITAMURA Hiroshi HATAKEYAMA Tatsuya SASAKI Masayuki YAMAGUCHI
IEICE TRANSACTIONS on Communications
Publication Date: 1999/02/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Issue on Photonics in Switching: Systems and Devices)
Category: Assembly and Packaging Technologies
semiconductor optical amplifier, spot-size-converter, angled facet, selective MOVPE, optical switch, optical gate, planar lightwave circuit,
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Spot-size-converter integrated semiconductor optical amplifiers have been developed as gate elements for optical 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.