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Title: The Design of Triple Rib Waveguide Couplers by the Discrete Spectral Index Method
Authors: Ng, W.-C.
Stern, M.S.
Chua, S.-J. 
Keywords: Directional couplers (DC's)
Discrete spectral index method
Power dividers
Rib waveguides
Three-guide couplers
Issue Date: Mar-1999
Citation: Ng, W.-C., Stern, M.S., Chua, S.-J. (1999-03). The Design of Triple Rib Waveguide Couplers by the Discrete Spectral Index Method. Journal of Lightwave Technology 17 (3) : 475-482. ScholarBank@NUS Repository.
Abstract: The operations of three-guide couplers are usually controlled by the width and refractive index of the guides. However, when rib waveguides are used in three-guide couplers and power dividers, we propose to use the dimensions of the ribs as the governing parameters instead. Formulating a new transcendental equation using the discrete spectral index (DSI) method, triple rib waveguide couplers are accurately analyzed for the first time. The new accurate and fast analysis of triple rib waveguides shows that the propagation constants of the various modes are dominantly controlled by the height of the middle rib. A systematic and simple procedure is consequently introduced to design quasi-transverse electric (TE) polarized triple rib waveguide couplers, which ensures maximum power transfer from one outermost guide to the other outermost guide. For triple rib power dividers, the height of the middle rib is found to control the amount of power that can be transferred from the excited middle rib waveguide to the two outer rib waveguides. Maximum power division is achieved when the three ribs of the waveguide are identical.
Source Title: Journal of Lightwave Technology
ISSN: 07338724
DOI: 10.1109/50.749388
Appears in Collections:Staff Publications

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