Analysis of 3-Line Tapered Velocity Couplers with a Nonlinear Waveguide

Toshiaki KITAMURA  Masahiro GESHIRO  Shinnokuke SAWA  Masato SASAKI  

IEICE TRANSACTIONS on Electronics   Vol.E78-C   No.10   pp.1378-1382
Publication Date: 1995/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Electromagnetic Theory)
power limiter,  tapered velocity coupler,  nonlinear waveguide,  finite difference method,  

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We investigate a three-waveguide tapered velocity coupler which consists of a uniform linear, tapered linear and tapered nonlinear slab waveguide. The coupling characteristics depending on the gap width between the waveguides and sloping angle of the tapered waveguides are analyzed by means of the finite difference method. The numerical results show that with realistic structural parameters flat output power characteristics can be obtained over a wide range of input power. It is found that it is possible to use the present structure as a power limiter.