Optical waveguide junction and method of making said junction

US4682843A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Hans Mahlein · Unterhaching, DE
• Herbert Michel · Munich, DE
• Achim Reichelt · Unterhaching, DE
• Gerhard Winzer · Munich, DE

Key dates

• Filing date: Feb 27, 1984
• Grant date: Jul 28, 1987
• Expiry date: Feb 27, 2004

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/29368
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical waveguide junction which can be used as a wavelength demultiplexer, having two aligned fibers separated from each other by a wavelength-selective filter and a fiber branching off laterally from these fibers at the level of the filter. At the same time, a greater degree of coupling efficiency, applicability in monomode fiber lines, and greater adjusting tolerances in production of the junction are achieved. It is recommended that each of the two aligned fibers have different core diameters, while the fiber feeding the filter has a smaller core diameter than the fiber continuing from the filter. In one embodiment of the invention the feed fiber includes a monomode fiber and the continuing fiber of a multimode. The junction can be used as a demultiplexer for optical-fiber transmission lines for unidirectional operation for demultiplexing.