British Telecommunications Public Limited Company

British Telecommunications Corporation

David B Mortimore

David B Payne

Benjamin J Ainslie

John W Arkwright

A method of forming a multiport optical fiber coupler in which a bundle of seven optical fibers are located in close-packed hexagonal array within a capillary tube and twisted. An optical source is coupled to an outer fiber. A fused, tapered coupler is formed, the tapering being stopped when the minimum of optical power outputs is first maximized. This provides a 6.times.7 optical fiber coupler. Also disclosed is a 7.times.7 optical fiber coupler formed by fusing the coupler during formation sufficiently to provide that the maximum insertion loss through the device between any input and output is minimized.

Method of forming multiport optical fibre coupler and the coupler so

Method of forming an optical fibre coupler and a coupler so formed

Optical star couplers

Optical two-way transmission system with loop reflector modulator

Technique for reducing fibre joint loss

Optical resonating device

Optical fused couplers

Growing community of inventors

Felixstowe, United Kingdom

David B Mortimore