Monolithically Integrated Mach-Zehnder Interferometer All-Optical Switches by Selective Area MOVPE

Xueliang SONG   Naoki FUTAKUCHI   Daisuke MIYASHITA   Foo Cheong YIT   Yoshiaki NAKANO   

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.7   pp.1068-1079
Publication Date: 2006/07/01
Online ISSN: 1745-1353
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Lasers, Quantum Electronics
Keyword: 
selective area growth ,  metal-organic vapor phase epitaxy ,  monolithic integration ,  photonic integrated circuits ,  all-optical switch ,  Mach-Zehnder interferometer ,  semiconductor optical amplifier ,  wavelength conversion ,  

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Summary: 
We achieved first dynamic all-optical signal processing with a bandgap-engineered MZI SOA all-optical switch. The wide-gap Selective Area Growth (SAG) technique was used to provide multi-bandgap materials with a single step epitaxy. The maximum photoluminescence (PL) peak shift obtained between the active region and the passive region was 192 nm. The static current switching with the fabricated switch indicated a large carrier induced refractive index change; up to 14 π phase shift was obtained with 60 mA injection in the SOA. The carrier recovery time of the SOA for obtaining a phase shift of π was estimated to be 250-300 ps. A clear eye pattern was obtained in 2.5 Gbps all-optical wavelength conversion. This is the first all-optical wavelength conversion demonstration with a bandgap-engineered PIC with either selective area growth or quantum-well intermixing techniques.