Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 16, Issue 1, Pages 171-173Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2003.818950
Keywords
directional couplers; left-handed material (LHM); optical planar waveguide couplers; supermode theory
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A novel directional coupler with a left-handed material (LHM) layer between two single-mode (SM) waveguides of usual material is introduced. The coupling system is analyzed with the supermode theory. It is shown that such an LHM layer of finite length can shorten significantly the coupling length for the two SM waveguides. An LHM layer with two slowly tapered ends is used to avoid the reflection loss at the ends.
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