Ofs Fitel, LLC

Fitel USA Corporation

Furukawa Electric North America, Inc.

Robert Lingle, Jr

David W Peckham

David Kalish

David John DiGiovanni

Jinkee Kim

George Edward Oulundsen, Iii

Durgesh Vaidya

Lance Gibson

Yifei Qian

Michael LuValle

Yi Sun

Donald Jablonowski

Michael J LuValle

Adverse hydrogen aging limitations in multiply-doped optical fibers are overcome by passivating these optical fibers using a deuterium passivation process. This treatment essentially pre-reacts the glass with deuterium so that the most active glass sites are no longer available to react with hydrogen in service. Optical fibers of main interest are doped with mixtures of germanium and phosphorus. Optimum passivating process conditions are described.

Accelerated aging of phosphorus-doped optical fibers

The specification describes an improved optical fiber produced by a hybrid VAD/MCVD process. The core of the fiber is produced using VAD and the inner cladding layer has a depressed index and is produced using MCVD. In preferred embodiments, the optical power envelope is essentially entirely contained in VAD produced core material and the MCVD produced depressed index cladding material. Optical loss is minimized by confining most of the optical power to the VAD core where OH presence is low, as well as by maximizing the optical power in the un-doped silica region. The MCVD substrate tube material is essentially devoid of optical power.

Low loss optical fiber designs for confining optical power to low-doped regions

Low loss optical fiber designs and methods for their manufacture

An improved optical fiber design has been found to exhibit a relatively low attenuation at the wavelength of 1385 nm (the 'water peak'), allowing for Raman amplification to be efficient and effective at wavelengths in the S-band range of 1460 to 1530 nm. An ultra-dry process is used to mate an inner core rod (core plus surrounding trench) with a cladding tube (ring region plus cladding layers) and provide a water peak loss on the order of 0.325 dB/km. The low water peak is combined with appropriate dispersion values and zero dispersion wavelength to form a fiber that supports transmission and Raman amplification in the S-, C- and L-bands of interest for optical transmission systems.

Optical fiber for improved performance in S-, C- and L-bands

An inverse dispersion fiber having a large effective area and a transmission system that incorporates the fiber for providing dispersion and dispersion slope compensation in a transmission fiber. The large-effective-area inverse dispersion optical fiber (IDF) has a negative dispersion and a negative dispersion slope. The effective area, A, of the IDF preferably is greater than approximately 31 micrometers squared (&#x3bc;m) at a transmission wavelength of approximately 1550 nm. The large-effective-area IDF is suitable for use with super-large-effective-area (SLA) transmission fiber for compensating dispersion in the SLA transmission fiber while reducing nonlinear effects between wavelength channels and cabling loss, which is especially advantageous in transoceanic and long-haul terrestrial systems. These nonlinear effects are inversely related to the effective area of the fiber (i.e., nonlinearities&#x2dc;1/A). Thus, an increase in the effective area of the fiber translates into a decrease in nonlinear interactions, which increases bandwidth capabilities and limits signal degradation. Furthermore, the large-effective-area IDF of the present invention has very desirable transmission properties. The present invention also provides a transmission system comprising at least one of the large-effective-area IDF optical fibers of the present invention. Furthermore, Acan be made large without having to increase the ratio, R, of the diameter of the core to the diameter of the trench region.

Large-effective-area inverse dispersion compensating fiber, and a transmission line incorporating the same

The specification describes an improved optical fiber design in which the criteria for high performance in a Raman amplified optical system, such as moderate effective area, moderate dispersion, low dispersion slope, and selected zero dispersion wavelength, are simultaneously optimized. In preferred embodiments of the invention, the dispersion characteristics are deliberately made selectively dependent on the core radius. This allows manufacturing variability in the dispersion properties, introduced in the core-making process, to be mitigated during subsequent processing steps.

Method for the manufacture of optical fibers, improved optical fibers, and improved raman fiber amplifier communication systems

Method for the manufacture of optical fibers, improved optical fibers, and improved Raman fiber amplifier communication systems

Growing community of inventors

Norcross, GA, United States of America

Robert Lingle, Jr