Photonic band gap fibers using a jacket with a depressed softening temperature

摘要

The present invention is generally directed to a photonic bad gap fiber and/or fiber preform with a central structured region comprising a first non-silica based glass and a jacket comprising a second non-silica based glass surrounding the central structured region, where the Littleton softening temperature of the second glass is at least one but no more than ten degrees Celsius lower than the Littleton softening temperature of the first glass, or where the base ten logarithm of the glass viscosity in poise of the second glass is at least 0.01 but no more than 2 lower than the base ten logarithm of the glass viscosity in poise of the first glass at a fiber draw temperature. Also disclosed is a method of making a photonic bad gap fiber and/or fiber preform.

主权项

1. A method of making a photonic band gap fiber preform, comprising the steps of:
providing a preform consisting of a central structured region and a jacket;
wherein the central structured region comprises a first non-silica based glass, and wherein the first glass has a Littleton softening temperature; andwherein the jacket comprises a second non-silica based glass, wherein the second glass has a Littleton softening temperature, wherein the second glass comprises a different composition than the first glass, and wherein the Littleton softening temperature of the second glass is at least one but no more than ten degrees Celsius lower than the Littleton softening temperature of the first glass; surrounding the central structured region with the jacket; and heating the jacket and central structured region wherein the second non-silica based glass flows into and fills any voids between the central structured region and the jacket.