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

Takemasa TAMANUKI
Shotaro KITAMURA
Hiroshi HATAKEYAMA
Tatsuya SASAKI
Masayuki YAMAGUCHI

Publication
IEICE TRANSACTIONS on Communications   Vol.E82-B    No.2    pp.431-438
Publication Date: 1999/02/25
Online ISSN: 
DOI: 
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
Keyword: 
semiconductor optical amplifier,  spot-size-converter,  angled facet,  selective MOVPE,  optical switch,  optical gate,  planar lightwave circuit,  

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Summary: 
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.