Protective cladding for a mono-mode directional coupler

US5430818A · kind A · utility

Assignee

• Deutsche Aerospace AG · DE

Inventors

• Engelbert Hartl · Munich, DE
• Gert Trommer · Munich, DE
• Hans Poisel · Leinburg, DE

Key dates

• Filing date: Jan 11, 1994
• Grant date: Jul 4, 1995
• Expiry date: Jan 11, 2014

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60K2001/045
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

The protective cladding for a mono-mode directional coupler made of at least two incoming and outgoing fiber optic waveguides which are fused to one another along a coupling segment comprises at least two open cladding parts which can be connected to form a tube-shaped cladding. The material of the cladding parts has the same coefficient of expansion as the waveguide material of the mono-mode directional coupler. The protective cladding, being mechanically tightly connected with the incoming and outgoing fiber optic waveguides while leaving open the coupling segment of the mono-mode directional coupler, is closed off in a gas-tight manner such that in the case of temperature changes, there are no mechanical tensions in the coupling segment.