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http://dx.doi.org/10.3807/KJOP.2005.16.5.446

The Generalized Characteristics of Extinction Ratio for a Directional Coupler and Design of Compact 1310/1550 nm Demultiplexer  

Choi, Chul-Hyun (School of Information and Communication Engineering, INHA University)
O, Beom-Hoan (School of Information and Communication Engineering, INHA University)
Lee, Seung-Gol (School of Information and Communication Engineering, INHA University)
Park, Se-Geun (School of Information and Communication Engineering, INHA University)
Lee, El-Hang (School of Information and Communication Engineering, INHA University)
Publication Information
Korean Journal of Optics and Photonics / v.16, no.5, 2005 , pp. 446-449 More about this Journal
Abstract
In a directional coupler, the design process requires repeated calculation of the characteristics of every changed structure, because it is generally difficult to expect the extinction ratio to be optimized over the entire variation of design parameters. In this paper, we systematically simulated the extinction ratio as a function of the design parameters, and analyzed the general tendency of that characteristic. In other words, we could find the generalized extinction ratio curve if the separation distance is normalized by the waveguide width. Here, the extinction ratio is shown to be increased as the normalized frequency (v) and the ratio (d) of the separation distance over the waveguide width were increased. For various structures with same ratio d, all corresponding extinction ratio curves as a function of v coincide with each other. We showed the usefulness of the generalized extinction ratio curve by applying it to the design and the fabrication of 1310/l550 nm demultiplexer, as it was convenient to design a shorter directional coupler with targeted extinction ratio from this curve.
Keywords
Directional coupler; Extinction ratio; Demultiplexer; Embossing process;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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