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Fitel USA Corp. Patents
Assignee:
Fitel USA Corp.
Address:
Norcross, GA
No. of patents:
193
Patents:


1 2 3 4










Patent Number Title Of Patent Date Issued
7946133 Methods for modifying ovality of optical fiber preforms May 24, 2011
Methods for modifying preform core ovality during and subsequent to the formation of an optical fiber preform. After MCVD deposition forms the core rod, but prior to overcladding of the core rod, the code rod may be etched to change its ovality. In order to etch the core rod, the core ro
7546750 Method for fabricating optical fiber using deuterium exposure June 16, 2009
Embodiments of the invention include a method for making optical fiber having reduced aging or hydrogen aging loss over the life of the fiber and optical fiber systems including such optical fibers. Improved silicon-oxygen stoichiometry during one or more preform manufacturing steps
7440664 Microstructured optical waveguide for providing periodic and resonant structures October 21, 2008
A microstructured optical waveguide is formed to include a periodic sequence of "plugs" of optically active material within the inner cladding air tunnels. The plugs are utilized as a grating structure for generating resonant and periodic structures. The waveguide (in one embodiment,
7352939 Polarization insensitive microbend fiber gratings and devices using the same April 1, 2008
A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit "splitting" between the resonant wavelengths supported by the TE and TM components of the LP.sub.1m mode and the resonant wavelength supported by the odd/even HE.sub.2m components of the
7340139 Polarization insensitive microbend fiber gratings and devices using the same March 4, 2008
A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit "splitting" between the resonant wavelengths supported by the TE and TM components of the LP.sub.1m mode and the resonant wavelength supported by the odd/even HE.sub.2m components of the
7340132 Polarization insensitive microbend fiber gratings and devices using the same March 4, 2008
A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit "splitting" between the resonant wavelengths supported by the TE and TM components of the LP.sub.1m mode and the resonant wavelength supported by the odd/even HE.sub.2m components of the
7272287 Optical fiber filter for suppression of amplified spontaneous emission September 18, 2007
An in-line, distributed optical fiber filter comprises a core region with a raised refractive index (with respect to the surrounding cladding material) so as to allow for total internal reflection (TIR) of the desired transmission wavelength(s). One or more raised index features are
7271916 Characterization of optical fiber using Fourier domain optical coherence tomography September 18, 2007
A fiber characterization arrangement utilizes Fourier domain optical coherence tomography (FDOCT) to measure the cross-section of optical fibers, thus providing information sub-surface features, coating thickness/concentricity and stress-induced birefringence under tension. The FDOCT
7266259 Optical fiber microcoil, resonant structure and method of making the same September 4, 2007
An optical fiber coil of sub-micron diameter is shown to exhibit self-coupling between adjacent turns so as to form a three-dimensional optical resonator of relatively low loss and high Q. As long as the pitch of the coil and propagating wavelength remain on the same order (or less t
7218803 Microsphere probe for optical surface microscopy and method of using the same May 15, 2007
An apparatus and method for performing surface microscopy of an optical device uses an optical fiber taper including a microsphere endpoint as a near field probe. A transmission fiber is disposed adjacent to the microsphere so as to evanescently couple an optical test signal into the
7212707 Temperature-compensated fiber grating packaging arrangement May 1, 2007
A passive temperature-compensated optical grating arrangement includes a housing of low CTE material, with the optical grating stretched across the housing between a first, fixed sidewall and a lever arm, the lever arm also being formed of a low CTE material. An expansion element of high
7209615 Etched tapered fiber bundle and method of making the same April 24, 2007
A tapered fiber bundle is formed by first etching the end portions of each fiber within the group so as to remove a selected amount of outer cladding material from each fiber. The assembled, etched fibers are then fused together in conventional fashion to form a fiber bundle. By first
7177510 Polarization insensitive microbend fiber gratings and devices using the same February 13, 2007
A microbend-induced fiber grating is formed from a section of optical fiber configured to exhibit "splitting" between the resonant wavelengths supported by the TE and TM components of the LP.sub.1m mode and the resonant wavelength supported by the odd/even HE.sub.2m components of the
7171130 Optical performance monitor utilizing nonlinear detection January 30, 2007
An optical performance monitor particularly well-suited for use in dense wavelength-division multiplexed (DWDM) systems includes both a nonlinear optical detector and a conventional linear detector. The nonlinear optical detector, which may comprise a quadratic detector, is used to p
7171089 Enhanced supercontinuum generation in highly nonlinear fibers using post-fabrication processing January 30, 2007
Enhancement of the supercontinuum generation performance of a highly-nonlinear optical fiber (HNLF) is accomplished by performing at least one post-processing treatment on the HNLF. Particularly, UV exposure of the HNLF will modify its dispersion and effective area characteristics so
7164833 Optical fiber for improved performance in S-, C- and L-bands January 16, 2007
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 m
7149429 Coarse wavelength division multiplexing system December 12, 2006
In a ring network comprising a plurality of nodes and a 16 channel coarse wavelength-division multiplexing (CWDM) plan, a technique is disclosed for adding and dropping channels that reduces the maximum attenuation loss that any channel encounters--thereby enabling longer rings to be
7143611 Rod-In-Tube optical fiber preform assembly and method having reduced movement December 5, 2006
Embodiments of the invention include an optical fiber preform assembly and a method for making optical fiber using the preform assembly. The assembly includes a preform core rod, at least one overclad tube formed around the preform core rod, a handle attached to one end of the overclad
7139478 Nonlinear device comprising a spectrally broadening fiber November 21, 2006
Embodiments of the invention include system for monitoring the effectiveness of pulse shaping in a nonlinear optical fiber (40). The spectral content of the pulse, after passing through the nonlinear fiber (40), provides an indication of how effectively the pulse was regenerated. A p
7116874 Enhanced supercontinuum generation in highly nonlinear fibers using strong bragg gratings October 3, 2006
Enhancement of the supercontinuum generation performance of a highly-nonlinear optical fiber (HNLF) is accomplished by incorporating at least one Bragg grating structure in the HNLF. The Bragg grating results in reflecting a core-guided signal into signal which also remains core-guid
7116472 Rare-earth-doped optical fiber having core co-doped with fluorine October 3, 2006
A rare-earth-doped optical fiber comprises a silica core region doped with a rare earth element and a cladding region adjacent the core region, characterized in that the core region is also doped with aluminum (Al) and fluorine (F). The presence of small amounts of F are effective to
7087841 Communication cable and method of installing same August 8, 2006
A communication cable for being used in ducts or tubes comprising an outer jacket (1) which is formed with ribs (4) spaced around the periphery of the jacket and extending along the length of the cable. The new profiled cable has a lower index of friction when being installed in the duct
7082228 Multiple order PMD compensator for optical fiber transmission system July 25, 2006
In accordance with the invention, an optical fiber transmission system is provided with multiple order PMD compensation to provide enhanced compensation at high bit rates and across a range of frequencies. Specifically, PMD is compensated by a concatenated series of components, each
7081808 Self-registration systems and methods for dynamically updating information related to a network July 25, 2006
Self-registration systems and methods for dynamically updating information related to a network, are provided. A self-registration system for dynamically updating information related to a network, comprises: a connector comprising an integrated circuit that stores a first block of in
7081323 Method of making gratings and phase masks for fiber grating fabrication July 25, 2006
In accordance with the invention, the fabrication of a grating phase mask is improved by providing a multiple-scan exposure which can provide an accumulated exposure that is effectively phase modulated or modulated rapidly in amplitude. Applicants have determined that exposure scans can
7072589 Method and apparatus for controlling the power level in an optical regenerator July 4, 2006
An optical regenerator enabling matching of self-phase modulation induced spectral broadening and optical regenerator filter center wavelengths and bandwidths for different fiber dispersion values. The regenerator monitors the central part of an input signal spectrum at the output of a
7072099 Relative intensity noise (RIN) reduction in fiber-based raman amplifier systems July 4, 2006
An arrangement for reducing the effects of pump signal relative intensity noise (RIN) in a Raman fiber amplifier. A portion of the output from a pump laser source is applied as an input to a compensating, lower power laser module, where fluctuations in the output power of the pump laser
7057735 Method for measuring the optical and physical thickness of optically transparent objects June 6, 2006
A method and apparatus for measuring the optical thickness and absolute physical thickness of an optically transparent object utilizes a reflective interferometric process. A broadband optical signal is directed toward the object to be measured, and a pair of signals reflected off of
7037003 Systems and methods for reducing splice loss in optical fibers May 2, 2006
Techniques are described for reducing splice loss between a pair of optical fibers. A first fiber is spliced to a second fiber at a splice point. A region of the spliced fibers, including the splice point, is thermally treated to cause a controlled diffusion of dopants in the region.
7035525 Methods and apparatuses for correcting mechanical twist in optical fiber April 25, 2006
Methods and apparatuses negate a measured mechanical twist of an optical fiber by introducing a counteracting twist to bring the net mechanical twist closer to zero, which reduces the fiber's polarization mode dispersion (PMD). A spool of optical fiber having undesirable mechanical t
7021083 Manufacture of high purity glass tubes April 4, 2006
A glass tube for use in an optical fiber preform is produced by applying a first soot on an end face of a starting member to form an elongated, porous cylindrical soot core having a first density, and applying a second soot including SiO.sub.2 on the periphery of the soot core to form
7013678 Method of fabricating graded-index optical fiber lenses March 21, 2006
A GRIN fiber lens is fabricated by the steps of providing a graded index glass preform, thinning the graded index preform to remove a sufficient thickness of the graded glass to establish a desired .DELTA.n, and drawing a graded index optical fiber from the thinned graded index prefo
7010195 Fiber optic grating with tunable polarization dependent loss March 7, 2006
A tunable polarization dependent loss element is formed of a fiber including a highly tilted optical grating. The grating is formed at an angle of approximately 45.degree. so as to preferentially scatter one polarization state out of the fiber core while allowing the remaining, ortho
7001466 Systems and methods for automatic and continuous coating supply during optical fiber production February 21, 2006
Systems and methods are disclosed for an automatic and continuous supply of coating material to a coating applicator in optical fiber fabrication. The present invention switches from one coating reservoir to another by way of a transitional period in which both coating reservoirs are
6996317 Optical devices including microstructured fiber sections disposed for transverse signal propagat February 7, 2006
A microstructured optical component is formed from an optical preform fabricated to include one ore more internal regions of differing refractive index. The preform is drawn into a fiber and sliced into relatively long individual fiber segments, each segment thus forming a microstruc
6990277 Enhanced multimode fiber January 24, 2006
A perturbed, multimode optical fiber exhibits order-of-magnitude improved capacity attributed to mode mixing--high per-channel bit rate, and large channel number due to large available bandwidth--without the added loss which, in the past, was associated with the perturbation stream.
6990270 Fiber amplifier for generating femtosecond pulses in single mode fiber January 24, 2006
A source of high-power femtosecond optical pulses comprises a combination of a relatively short rare-earth doped fiber amplifier (e.g., less than five meters) with a first section of single mode fiber (or other dispersive element) disposed at the input of the amplifier to "pre-chirp"
6967767 Swept wavelength broadband Raman pump source November 22, 2005
A swept wavelength source for broad bandwidth Raman pump applications includes a source of ultrashort (e.g., picosecond) optical pulses. The pulse train output from the source is then applied as an input to a linear dispersive element (such as a section of negative dispersion-shifting
6960028 Optical fiber connection utilizing fiber containing ferrules November 1, 2005
A ferrule for use in optical fiber connections has an optical fiber containing a bore extending therethrough. Within the bore is a member of shaped memory alloy (SMA) which clamps and affixes the fiber firmly in place within the ferrule without the necessity of cementing the fiber in
6950611 In-line polarization monitoring and control in lightwave communication systems September 27, 2005
Polarization monitoring and control in a lightwave communication system is achieved by using an in-line polarimeter in conjunction with a polarization controller. The devices are readily compact, accurate and therefore capable of implementation in a variety of system applications. In
6950578 Highly index-sensitive optical devices including long period fiber gratings September 27, 2005
A long period fiber grating (LPG) device is formed to exhibit a "turn-around-point" (TAP) in a phase matching curve when the group velocities of two propagating modes are matched. When the grating period of the LPG is selected to coincide with the TAP, a large tuning bandwidth is for
6941081 Method and apparatus for polarization measurements September 6, 2005
A method and apparatus for polarization measurements. A polarization state of an optical signal can be determined using a polarization analyzer comprising a polarization controller, a polarizer, a wavelength dispersive element and a photo-detector. The method and apparatus can be applied
6904210 Fiber optic ribbon and method of buffering loss June 7, 2005
A fiber optic cable is disclosed that buffers against loss, where the cable includes an outer jacket, and an optical fiber ribbon disposed within the outer jacket, wherein the ribbon includes more than one optical fiber, and at least two distinct matrix coatings disposed on the optical f
6899470 Systems and methods for fabricating low-loss, high-strength optical fiber transmission lines May 31, 2005
Systems and techniques are described for fabricating a low-loss, high-strength optical transmission line. In one described technique, a first fiber is spliced to a second fiber at a splice point. The spliced fibers are loaded into a heat treatment station, where a gas torch flame is
6898368 Adapter systems for dynamically updating information related to a network and methods for develo May 24, 2005
Adapter systems for dynamically updating information related to a network and methods for developing the adapter systems, are provided. An adapter system for dynamically updating information related to the network comprises: an adapter; and an antenna integrated in one of a surface of
6888991 Single-mode fiber systems May 3, 2005
Single-mode optical fiber systems, incorporating fiber of core radius of sufficient size to support the fundamental mode together with from one to three higher order modes, exhibit performance/cost advantages relative to systems based on traditional single-mode fiber.
6865327 Method of making optical fiber with reduced E-band and L-band loss peaks March 8, 2005
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,
6865320 Optical taps formed using fiber gratings March 8, 2005
A matched pair of tilted gratings may be formed in a section of optical fiber (or waveguide) and used as a "tap" to measure the power of an optical signal passing through the fiber. By using a pair of highly-tilted gratings (e.g., tilted at an angle of 45.degree. with respect to the
6859596 Systems and methods for forming ultra-low PMD optical fiber using amplitude and frequency keyed February 22, 2005
A system and method is disclosed for manufacturing single mode optical fiber which incorporates a spin in the molten fiber during manufacturing. The introduction of spin minimizes a form of distortion called polarization mode dispersion (PMD) and varying the spin, i.e. changing its c
6847763 Colorless tunable dispersion compensator January 25, 2005
A colorless tunable dispersion compensator (TDC) comprises a plurality of N separate dispersion compensation elements, each centered at a different wavelength used in the communication system. A single tuning element is coupled to the plurality of separate dispersion compensation element
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