Ofs Fitel, LLC

Fitel USA Corporation

Jake Bromage

Robert M Atkins

Poul Kristensen

Alice Weimin Liu

Clifford E Headley

Kai H Chang

Stig Nissen Knudsen

Khushvinder Brar

Jean-Christopher Bouteiller

Morten Østergaard Pedersen

Jan Levin Nielsen

Applicants have discovered the existence of loss peaks in optical fiber transmission systems using wavelengths in the E-band and the L-band. Specifically, they have discovered the existence of narrow loss peaks at 1440 nm, 1583 nm and 1614 nm. Because the peaks are relatively narrow, they cannot be easily removed by conventional gain equalizers in long haul transmission systems, and although the peaks are relatively small, they can nonetheless cause transmission channels to drop out in amplified DWDM transmission systems. Applicants have further discovered that these loss peaks are due to carbon contamination of the transmission fiber. Thus optical fibers should be fabricated essentially free of carbon contamination. This means eliminating carbon-containing reagents in preform and tube-making processes.

Method of making optical fiber with reduced E-band and L-band loss peaks

In accordance with the invention, an optical fiber communication system comprising a source of optical signal channels and an optical fiber transmission line is provided with one or more single source, multiple-order Raman pumps downstream of the source. Each single source pump provides multiple-order Raman pump light for amplifying the signal channels.

Single-source multiple-order raman amplifier for optical transmission systems

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North Plainfield, NJ, United States of America

Jake Bromage