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

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription