Optical fibre coupling device
First Claim
1. An optical fibre coupling device, comprising an optical fibre waveguide having at a fibre end a surface of core material which is surrounded by a body of cladding material, in which at said core end a circular symmetric phase plate is centered about said core material such that light entering or leaving said waveguide experiences a predetermined phase change, and wherein said phase plate is provided by a recess extending into at least one of said cladding material and said core material from the fibre end to a particular axial distance below a plane defined by the outer edge at the surface of cladding material at the fibre end.
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Abstract
An optical fibre coupling device comprises a mount 11 supporting an optical fibre waveguide having at a fibre end a surface of the fibre core 2 material which is surrounded by a body 3 of cladding material. At the core end a circular symmetric phase plate 7 is centered about the core 2 such that the light from a laser 1 entering or leaving the waveguide experiences a predetermined phase change. The phase change can act to reduce an optical coupling loss which occurs when the device is in use.
38 Citations
4 Claims
- 1. An optical fibre coupling device, comprising an optical fibre waveguide having at a fibre end a surface of core material which is surrounded by a body of cladding material, in which at said core end a circular symmetric phase plate is centered about said core material such that light entering or leaving said waveguide experiences a predetermined phase change, and wherein said phase plate is provided by a recess extending into at least one of said cladding material and said core material from the fibre end to a particular axial distance below a plane defined by the outer edge at the surface of cladding material at the fibre end.
Specification