Transfer matrix analysis of the unidirectional grating-assisted codirectional coupler
Applied Optics, Vol. 46, Issue 33, pp. 8052-8060 (2007)
http://dx.doi.org/10.1364/AO.46.008052
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Abstract
The unidirectional grating-assisted codirectional coupler (U-GACC) has recently been proposed. This unique structure permits irreversible coupling between orthogonal waveguide eigenmodes by means of simultaneous modulation of both the real and imaginary parts of the refractive index in the coupling region. Analysis of the U-GACC has until now relied on coupled mode theory, which can be restrictive in its application as a design tool. We analyze the U-GACC by the transfer matrix method, which demonstrates in a simple fashion why the device operates in a unidirectional manner. In addition, we show that for all practical designs, there is a limit to the minimum cross talk between outputs, a phenomenon that has not been previously identified.
© 2007 Optical Society of America
OCIS Codes
(060.1810) Fiber optics and optical communications : Buffers, couplers, routers, switches, and multiplexers
(130.3120) Integrated optics : Integrated optics devices
(250.4480) Optoelectronics : Optical amplifiers
ToC Category:
Integrated Optics
History
Original Manuscript: August 15, 2007
Revised Manuscript: September 26, 2007
Manuscript Accepted: October 15, 2007
Published: November 19, 2007
Citation
Brian R. West and David V. Plant, "Transfer matrix analysis of the unidirectional grating-assisted codirectional
coupler," Appl. Opt. 46, 8052-8060 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-33-8052
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