Hybrid-Integrated Symmetric Mach-Zehnder All-Optical Switches and Ultrafast Signal Processing

Kazuhito TAJIMA  Shigeru NAKAMURA  Akio FURUKAWA  Tatsuya SASAKI  

IEICE TRANSACTIONS on Electronics   Vol.E87-C   No.7   pp.1119-1125
Publication Date: 2004/07/01
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: INVITED PAPER (Special Section on Ultrafast Photonics)
all-optical switch,  optical communication,  nonlinear optics,  semiconductor optical amplifier,  

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Symmetric Mach-Zehnder (SMZ) type all-optical swit-ches are discussed. The SMZ type all-optical switches feature the so-called differential phase modulation scheme to achieve a speed unrestricted by efficient, thus usually slow nonlinearities. In these switches, semiconductor optical amplifiers (SOAs) are often used to realize low optical power switching. We discussed SOAs from a view point of all-optical switch applications, rather than amplifier applications. Finally, all-optical signal processing experiments are discussed with the SMZ type all-optical switches. These include ultrafast demultiplexing of 336 Gb/s signal pulses and random operations at 42 Gb/s for all-optical logic operation and wavelength conversion.