Control Scheme for Optimizing the Interferometer Phase Bias in the Symmetric-Mach-Zehnder All-Optical Switch

Yoshiyasu UENO
Morio TAKAHASHI
Shigeru NAKAMURA
Kouichi SUZUKI
Takanori SHIMIZU
Akio FURUKAWA
Takemasa TAMANUKI
Kazuo MORI
Satoshi AE
Tatsuya SASAKI
Kazuhito TAJIMA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E86-C    No.5    pp.731-740
Publication Date: 2003/05/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section INVITED PAPER (Joint Special Issue on Recent Progress in Optoelectronics and Communications)
Category: OECC Awarded Paper
Keyword: 
all-optical,  control scheme,  demultiplexing,  interferometer,  phase bias,  

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Summary: 
Control scheme for accurately optimizing (and also automatically stabilizing) the interferometer phase bias of Symmetric-Mach-Zehnder (SMZ)-type ultrafast all-optical switches is proposed. In this control scheme, a weak cw light is used as a supervisory input light and its spectral power ratio at the switch output is used as a bipolar error signal. Our experimental result at 168-Gb/s 16:1 demultiplexing with a hybrid-integrated SMZ switch indicates the feasibility and the sensitivity of this control scheme.