Abstract
Coupling characteristics of a dual-mode–single-mode evanescent field coupler are obtained and its performance as a first-higher-order-mode filter is studied. It is observed that the performance of such a device as a modal filter depends critically on the relative powers and phases of the two modes of the dual-mode waveguide at its input. In particular it is shown that if the fractional power in the fundamental mode of the dual-mode waveguide is large, then the power filtered in the single-mode waveguide depends strongly on the phase difference between the two modes, and it is not a good measure of the power in the first higher mode of the dual-mode waveguide.
© 1992 Optical Society of America
Full Article | PDF ArticleMore Like This
Walter K. Kahn and Salama A. Saleh
Appl. Opt. 31(15) 2780-2790 (1992)
Alok K. Das and Anwar Hussain
Appl. Opt. 36(27) 6822-6827 (1997)
Martin N. Weiss and Ramakant Srivastava
Appl. Opt. 34(6) 1029-1040 (1995)