Experimental Studies of Switching Characteristics for All-Optical Demultiplexer Module

Rainer HAINBERGER  Yuki KOMAI  Yasuyuki OZEKI  Masahiro TSUCHIYA  Kashiko KODATE  Takeshi KAMIYA  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E84-C   No.3   pp.358-363
Publication Date: 2001/03/01
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical Interconnects/Optical Signal Processing)
Category: Device
Keyword: 
saturable absorber,  all-optical switch,  diffractive optics,  time division multiplexing,  optical interconnection,  

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Summary: 
By combining the technology of all-optical saturable absorbers and the diffractive optics, a scheme of all-optical time division demultiplexing module is investigated. Following authors' proposal, design, test fabrication of the optical platform in the previous paper, this paper focuses on the characterization of switching performance. Using a multiple quantum well saturable absorber of InGaAs/InAlAs composition, and gain switched semiconductor laser pulses of 25 ps pulse width, the switching function was demonstrated experimentally at wavelength of 1.55 µm. The switching on-off ratio was compared among 4 lens configuration, 2 lens configuration (2L) and free space, collinear geometry. No degradation was observed in the case of 2 lens configuration in comparison to collinear illumination. Thus the feasibility of all-optical switch module with power efficiency and high speed is predicted, under the assumption of the progress in sub-micron lithography.