NDLI: Broad-band high-silica optical waveguide star coupler with asymmetric directional couplers

Content Provider	IEEE Xplore Digital Library
Author	Yanagawa, H. Nakamura, S. Ohyama, I. Ueki, K.
Copyright Year	1983
Abstract	A broadband optical waveguide star coupler with asymmetric directional couplers is proposed. A coupling or splitting ratio of the coupler is flattened with respect to wavelength by choosing appropriate values for Delta beta and complete power transfer length. The wavelength characteristics of uniform and alternating Delta theta b directional couplers are investigated, and their broadband operation is shown theoretically. To demonstrate the feasibility of the new proposal, 8*8 star couplers composed of such asymmetric directional couplers are fabricated by using high-silica waveguides on a silicon chip. A star coupler composed of asymmetric directional couplers exhibited 2-dB loss variation in the wavelength range of 1.3-1.55 mu m, and this value was almost one fourth of that of a star coupler composed of symmetric directional couplers.<>
Sponsorship	IEEE Lasers and Electro-Optics Society Optical Society of America
Starting Page	1292
Ending Page	1297
Page Count	6
File Size	607142
File Format	PDF
ISSN	07338724
Volume Number	8
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1990-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical waveguides Optical coupling Directional couplers Optical fiber couplers Optical refraction Optical variables control Optical device fabrication Optical switches Optical waveguide theory Optical losses
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics

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