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Proceedings Paper

Dynamic optical coupling technique based on complementary Dammann gratings
Author(s): Xin Zhao; Changhe Zhou; Liren Liu
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Paper Abstract

With the development of optical communication, the need of dynamic optical couplers, especially of Ν broad band couplers, becomes greater. Though some advanced fiber fusion techniques have been developed, they still have many shortcomings. We proposed a new 1×Ν dynamic coupler employing two even-numbered Dammann gratings. We divide a conventional Dammann grating into two complementary gratings. When there is no shift between them, they equal to a normal Dammann grating. The light that comes from the input fiber is diffracted into Ν spots with equal intensity and coupled into the Ν output fibers. When the two gratings have an accurate shift of a half-period, the total phase difference reduces to zero because of the complement. The light coming from the input fibers are coupled into the only one fiber which locates in the center. So they can work as a beam splitter or a combiner according to the relative shift between them. This approach has the clear advantage of realizing dynamic coupling of medium size of channels (e.g. 8×16) and is superior to the conventional methods particularly in very high Ν arrays. Experimental results of 1×8 optical dynamic coupler are presented in this paper.

Paper Details

Date Published: 15 November 2002
PDF: 8 pages
Proc. SPIE 4788, Photonic Devices and Algorithms for Computing IV, (15 November 2002); doi: 10.1117/12.451622
Show Author Affiliations
Xin Zhao, Shanghai Institute of Optics and Fine Mechanics (China)
Changhe Zhou, Shanghai Institute of Optics and Fine Mechanics (China)
Liren Liu, Shanghai Institute of Optics and Fine Mechanics (China)

Published in SPIE Proceedings Vol. 4788:
Photonic Devices and Algorithms for Computing IV
Khan M. Iftekharuddin; Abdul Ahad S. Awwal, Editor(s)

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