Method for making optical fibre with low E-waveband and L-waveband loss wave peak

Abstract

This invention relates to optical fibers, and more particularly to methods of making optical fibers having low E-band and L-band loss peaks, and fibers made by such methods. Applicants have discovered the presence of loss peaks in optical fiber transmission systems using E-band and L-band wavelengths. In particular, they have found the existence of narrow loss peaks at 1440nm, 1583nm, and 1614nm. Since the peaks are relatively narrow, they are difficult to remove by ordinary gain equalizers in long-distance transmission systems, and even though the peaks are relatively small, they can cause signal drops in the transmission channel in amplified DWDM transmission systems. Applicants have further discovered that these loss peaks are all due to carbon contamination of the transmission fibers. Therefore, the manufacture of optical fibers should fundamentally prevent carbon contamination. This means eliminating carbonaceous reagents during the manufacture of prototype rods and tubes.

Description

technical field [0001] This invention relates to optical fibers, and more particularly to methods of making optical fibers having low E-band and L-band loss peaks, and fibers made by such methods. The method and fiber are especially useful for broadband transmission. Background technique [0002] In the field of modern telecommunication systems, optical fiber is a key component. Basically, an optical fiber is a thin glass filament capable of transmitting light signals carrying large amounts of information over long distances with little signal loss. Even better, the fiber can transmit all the same wavelengths (wavelengths of interest) with the same small loss. [0003] In its simplest form, a bundle of optical fibers is a bundle of small-diameter waveguides with a core of a first refractive index surrounded by a metal coating of a second (lower) refractive index (cladding) package. More typically, optical fibers are composed of high-purity silica with low dopant concentr...

AI Technical Summary

Problems solved by technology

Unfortunately, since the range of wavelengths used has been extended to the L-band, balanced low loss cannot be a fact

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