Filter for a light wave in a light guiding fiber

US4139262A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Hans Mahlein · Unterhaching, DE
• Gerhard Winzer · Munich, DE

Key dates

• Filing date: Jan 12, 1977
• Grant date: Feb 13, 1979
• Expiry date: Jan 12, 1997

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/03694
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

A filter comprising multiple cylindrical layers of alternately high- and low-refractive materials and surrounded by a light-absorbent material with an outer diffusing surface is deposited by evaporation about a short axial length of a glass fiber to polarize or spectrum-filter light passing through said fiber. The indices of refraction of the filter layers are higher than the effective guide indices of the modes of the fiber core.