National Changhua University of Education Institutional Repository : Item 987654321/11911

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NCUEIR > College of Engineering > Department and Graduate Institute of Electronic Engineering > Periodical Articles > Item 987654321/11911

Please use this identifier to cite or link to this item: http://ir.ncue.edu.tw/ir/handle/987654321/11911

Title:	Cross-talk problems in optical directional couplers
Authors:	Chen, Kuo-Liang;Wang, Shyh
Contributors:	電機工程系
Date:	1984-01
Issue Date:	2012-07-03T01:34:44Z
Publisher:	American Institute of Physics Inc.
Abstract:	Cross‐talk in optical directional couplers is usually considered to be limited only by the processing technology. We show that unequal coupling of an input wave to the even and the odd mode of the coupling region gives rise to another kind of cross‐talk. The extinction ratio is well approximated by the overlap integral of the fields in the two waveguides. For a given coupling length, the higher the index step a waveguide has, the less the cross‐talk is. For straight couplers without bends one way to eliminate the cross‐talk is to offset the input wave relative to the coupled guides with the penalty of power loss. A three‐waveguide coupler has a different cross‐talk problem of comparable magnitude
Relation:	Applied Physics Letters, 44(2): 166-168
Appears in Collections:	[Department and Graduate Institute of Electronic Engineering] Periodical Articles

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