Monomode optical transmission fibre having a tapered end portion provided with a lens and method of manufacturing such a fibre
First Claim
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1. A monomode optical transmission fibre comprising a core surrounded by a cladding, the fibre having a straight portion terminating in a uniformly tapered portion which extends completely to one end of the fibre;
- and a spherical lens contacting said end of the fibre and consisting of a droplet of transparent material solidified thereon from the liquid state, such droplet having a diameter substantially larger than the diameter of said core at said end of the fibre;
characterized in that said lens material has a melting temperature which is lower than that of either said core material or said cladding material and has a refractive index which is substantially equal to that of said core material.
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Abstract
A monomode optical transmission fibre (1) is described, having a tapered end portion (5) on which a lens (10) is arranged. This lens is obtained by immersing the fibre end in a transparent liquid material (7) whose melting temperature is lower than that of the fibre materials and whose refractive index is substantially equal to that of the fibre core (2), and by allowing the drop which adheres to the fibre after withdrawal to solidify.
41 Citations
9 Claims
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1. A monomode optical transmission fibre comprising a core surrounded by a cladding, the fibre having a straight portion terminating in a uniformly tapered portion which extends completely to one end of the fibre;
- and a spherical lens contacting said end of the fibre and consisting of a droplet of transparent material solidified thereon from the liquid state, such droplet having a diameter substantially larger than the diameter of said core at said end of the fibre;
characterized in that said lens material has a melting temperature which is lower than that of either said core material or said cladding material and has a refractive index which is substantially equal to that of said core material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- and a spherical lens contacting said end of the fibre and consisting of a droplet of transparent material solidified thereon from the liquid state, such droplet having a diameter substantially larger than the diameter of said core at said end of the fibre;
Specification