Optical waveguide element with directional coupler

Details Optical waveguide element with directional coupler Optical waveguide element with directional coupler

2007-08-14

2007-08-14

Pak, Sung (Department: 2874)

Optical waveguides

With optical coupler

Particular coupling structure

C385S028000, C385S031000

Reexamination Certificate

active

10692343

ABSTRACT:
An optical waveguide element having a directional coupler is disclosed. The element includes a first and a second waveguide located adjacent to each other at a predetermined portion for mode coupling, a first dummy waveguide extending from an one end of the second waveguide, a reflector installed on an end surface of the first dummy waveguide, and a second dummy waveguide located adjacent to the first dummy waveguide at a predetermined portion for a mode coupling. The optical signals progressing from the second dummy waveguide to the first dummy waveguide disappear while sequentially passing through the reflector and the second dummy waveguide. In the optical waveguide element, optical signals passing through the first dummy waveguide gradually disappear while passing through the reflector and the second dummy waveguide, thereby improving a bi-directional cross-talk.

REFERENCES:
patent: 5200612 (1993-04-01), Moriya et al.
patent: 5633962 (1997-05-01), Kurata
patent: 6480647 (2002-11-01), Kitamura
patent: 03223705 (1991-10-01), None

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