Browse Prior Art Database

NON-RECIPROCAL OPTICAL COUPLERS FOR OPTICAL FIBER AND INTEGRATED OPTICS APPLICATIONS

IP.com Disclosure Number: IPCOM000025634D
Original Publication Date: 1986-Dec-31
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 64K

Publishing Venue

Xerox Disclosure Journal

Abstract

It is current thinking that the optical coupling between two parallel optical waveguides A and B is such that power is transferred equally from waveguide A to B or from B to A so long as the waveguides are loss free. Analysis of this subject, however, indicates that this is not the case. In fact, the relative power transfer can differ greatly depending on the ratio of the coupling coefficients squared.

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XEROX DISCLOSURE JOURNAL

NON-RECIPROCAL OPTICAL Proposed Classification COUPLERS FOR OPTICAL FIBER
AND INTEGRATED OPTICS
APPLICATIONS
William Streifer
Amos Hardy

U.S. Ci. 350/96.15 Int. C1. G02b 6/26

It is current thinking that the optical coupling between two parallel optical waveguides A and B is such that power is transferred equally from waveguide A to B or from B to A so long as the waveguides are loss free. Analysis of this subject, however, indicates that this is not the case. In fact, the relative power transfer can differ greatly depending on the ratio of the coupling coefficients squared.

Physically, power is optically coupled mnre efficiently from the weaker waveguide to the stronger waveguide than vice versa, the terms "weaker" and "stronger" having reference here to Waveguide lossless efficiency. Thus, if a local area network (LAN) employs an optical fiber, for example, with some waveguide "strength", a coupler using a parallel "weaker" fiber waveguide can be fabricated to tap small percentages f pt t b tsr fr ~ITI the 1.AU for detection purposes, e.g. detection of the signal being transmitted. On the other hand, very large percentages of power may be injected from the "weaker" fiber waveguide for exciting the LAN. Such behavior is highly desirable and has been heretofore considered impossible to achieve vith passive optical components vis a vis active optical components.

The above application is not limited to fibers but such a coupler can also be f...