| Patent Number |
Title Of Patent |
Date Issued |
| 7280728 |
Rare earth doped single polarization double clad optical fiber with plurality of air holes |
October 9, 2007 |
| An optical fiber including: (i) a silica based, rare earth doped core having a first index of refraction n.sub.1; (ii) a silica based inner cladding surrounding the core and having a second index of refraction n.sub.2, such that n.sub.1>n.sub.2, said inner cladding having a plural |
| 7194172 |
Single polarization optical fiber and system and method for producing same |
March 20, 2007 |
| An optical fiber that includes a central core having a maximum dimension (A) greater than a minimum dimension (B), preferably with an aspect ratio greater than 1.5, the fiber having at least one air hole positioned on opposite sides of the central core and extending along the fiber's len |
| 7158705 |
Optical fiber with birefringence and large mode field diameter |
January 2, 2007 |
| According to the present invention the optical fiber includes a core with a first refractive index (n.sub.1) and the innermost core region with the refractive index n.sub.0, a cladding surrounding the core, the cladding having a third refractive index (n.sub.3), wherein n.sub.1>n.sub. |
| 7120340 |
Single polarization optical fiber laser and amplifier |
October 10, 2006 |
| An optically active linear single polarization device includes a linearly birefringent and linearly dichroic optical waveguide (30) for propagating light and having single polarization wavelength range (48). A plurality of active dopants are disposed in a portion (34) of the linearly |
| 7079737 |
Devices and methods for dynamic dispersion compensation |
July 18, 2006 |
| The present invention provides devices and methods for dispersion compensation. According to one embodiment of the invention, a dispersion compensating device includes a negative dispersion fiber having an input configured to receive the optical signal, the negative dispersion fiber |
| 7068943 |
Devices and methods for dynamic dispersion compensation |
June 27, 2006 |
| The present invention provides devices and methods for dynamic dispersion compensation. According to one embodiment of the invention, a dispersion compensating device includes a negative dispersion fiber having an input configured to receive the optical signal, the negative dispersion fi |
| 7043125 |
Optical waveguide fiber for local access |
May 9, 2006 |
| Disclosed is a single mode optical waveguide fiber having a low cut off wavelength, and mode field diameter and bend resistance similar to step index single mode optical waveguide fiber designed for use at 1310 nm. By including a clad region of raised refractive index spaced apart from t |
| 6952515 |
Non-linear positive dispersion optical fiber |
October 4, 2005 |
| The present invention comprises an optical fiber have a small effective area and a positive dispersion suitable for use in the reshaping and regeneration of optical signals. The optical fiber according to the present invention has an effective area between about 10 .mu.m.sup.2 and 16 |
| 6912342 |
Optical fiber module having reduced multi-path interference |
June 28, 2005 |
| Disclosed is a fiber optic module containing one or more optical fibers having an attenuator formed in the output end of the fibers to filter out unwanted higher order modes. The optical fibers are typically gain fibers or dispersion compensating fibers, and the attenuator consists of a |
| 6873776 |
Waveguide fiber for dispersion and slope compensation |
March 29, 2005 |
| Disclosed is a total dispersion and total dispersion slope compensating optical waveguide fiber. The refractive index profile of the compensating waveguide fiber includes a core region having a central segment and two surrounding annular segments. In an embodiment of the compensating |
| 6865328 |
Positive dispersion optical fiber |
March 8, 2005 |
| The present invention provides devices and methods for dispersion compensation. According to one embodiment of the invention, a dispersion compensating device includes a negative dispersion fiber having an input configured to receive the optical signal, the negative dispersion fiber |
| 6650814 |
Single mode dispersion compensating optical fiber |
November 18, 2003 |
| A single mode dispersion and dispersion slope compensating optical fiber includes a central core segment, a depressed moat segment, an annular ring segment, and a cladding layer. Each of the segments of the fiber have a relative refractive index that are selected to provide negative disp |
| 6539151 |
Method for making separable multiple core optical fibers, the resulting fiber structures, and us |
March 25, 2003 |
| Optical fiber structures having at least two cores, whether unitary or separable, may be fabricated by controlling the placement of the cores prior to final processing to make the multi-core fiber structure. When the fiber is to be separable, at least two performs are attached, and the |
| 6400879 |
Highly non-linear single mode waveguide |
June 4, 2002 |
| Disclosed is a single mode optical waveguide fiber having a core region refractive index profile designed to provide a highly non-linear refractive index. The core index profile of the highly non-linear waveguide is an .alpha.-profile which has pre-selected values of relative refract |
| 6330382 |
Mode conditioning for multimode fiber systems |
December 11, 2001 |
| A single mode waveguide coupling to a multimode fiber of a high-bandwidth local optical network is made by a tapered coupler that expands the spot size of the propagating beam to fill additional modes of the multimode fiber. The tapered coupler has a core surrounded by inner and outer la |
| 6317536 |
Phased fiber array for multiplexing and demultiplexing |
November 13, 2001 |
| A reduced size multiplexer/demultiplexer component is achieved by tapering of waveguide ends in any of the input, output array, or phase shifting array of waveguides. Cross talk is limited in the tapered region by requiring that each waveguide in a tapered array have a distinct propa |
| 6307991 |
Optical filter with harmonic elements |
October 23, 2001 |
| Optical interference filters are designed with harmonic elements that can be related to Fourier series approximations of desired filter responses. The harmonic elements can be fashioned as individual waveguides of an array arranged in various formats including planar or concentric ge |
| 6282342 |
Monolithic coaxial device |
August 28, 2001 |
| The present invention provides environmentally stable interferometric and lattice devices that exhibit low excess loss and polarization dependent loss. The interferometric and lattice devices of the present invention are inexpensive and simple to make. The modal noise at the splices betw |
| 6256442 |
Athermal integrated optical waveguide device |
July 3, 2001 |
| An athermalized integrated optical waveguide device in which thermal spectral shifts are inhibited is provided and in which the light transmitting properties are insensitive to temperature variations and fluctuations. The athermnalized integrated optical waveguide device has at least |
| 6240748 |
Frequency and amplitude modulated fiber spins for PMD reduction |
June 5, 2001 |
| The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PMD for commercial fibers for w |
| 6211962 |
Sensor apparatus with polarization maintaining fibers |
April 3, 2001 |
| A distributed sensor (10) includes a plurality of stages (24, 28, 32, 36, 40) connected in series, each stage incorporating a length of polarization maintaining fiber (12) exposed to a phenomena such as mechanical deformation or temperature to be sensed. Inter-mode couplers are provided |
| 6201237 |
Fiber optic sensor |
March 13, 2001 |
| A fiber optic sensor for simultaneously and independently measuring temperature and axial stress. The fiber sensor includes a pair of polarization-maintaining fibers that have known strain and temperature response curves. Each fiber has a plurality of fiber segments in which the elli |
| 6175668 |
Wideband polarization splitter, combiner, isolator and controller |
January 16, 2001 |
| A wideband polarization splitter and combiner is fabricated using either fiber coupler technology or planar coupler technology. The device splits or combines wideband light signals without losing a substantial amount of spectral information. An antipodal phase generator is used to split |
| 6137927 |
N-port reconfigurable DWDM multiplexer and demultiplexer |
October 24, 2000 |
| An N-port optical wavelength division multiplexer and demultiplexer includes two evanescent wave couplers connected by N optical paths. Each of the optical paths includes wavelength-selecting elements that are used to select specific wavelengths of light. Light signals composed of N |
| 6088494 |
Aperiodic Mach-Zehnder optical filters |
July 11, 2000 |
| A Mach-Zehnder filter is provided with a strongly aperiodic transfer function including a broad, sharply defined pass band. The filter can be used in conjunction with optical amplifiers. |
| 6044191 |
Dispersion managed optical waveguide |
March 28, 2000 |
| A single-mode optical waveguide fiber designed to limit power penalty due to four wave mixing and a method of making the waveguide is disclosed. Variations in properties, e.g., radius or refractive index, of the waveguide fiber core provide a total dispersion which varies along the l |
| 5997014 |
Braking system for an in-line skate |
December 7, 1999 |
| A braking system for an in-line skate. The skate includes a boot mounted on a chassis. A cuff is rotatably mounted on the chassis. The chassis also has a plurality of wheels rotatably mounted thereon. The braking system for the skate includes a brake pad housing which is either fixedly o |
| 5946432 |
Periodic mach-zehnder optical filters |
August 31, 1999 |
| A Mach-Zehnder filter is provided with a strongly aperiodic transfer function including a broad, sharply defined pass band. The filter can be used in conjunction with optical amplifiers. |
| 5943466 |
Frequency and amplitude modulated fiber spins for PMD reduction |
August 24, 1999 |
| The invention provides improved methods for reducing polarization mode dispersion (PMD) in single mode fiber by spinning the fiber during the drawing process in accordance with a spin function having sufficient harmonic content to achieve low levels of PMD for commercial fibers for w |
| 5925163 |
Method of making an optical fiber with an axially decreasing group velocity dispersion |
July 20, 1999 |
| An optical fiber preform is made by supplying the base glass reactant and the dopant glass reactant to a burner that generates a flame in which a stream of glass particles is produced. The burner moves with respect to a rotating mandrel to deposit layers of glass particles on the mandrel |
| 5897633 |
System for converting programs and databases to correct year 2000 processing errors |
April 27, 1999 |
| A method of modifying programs and databases having abbreviated date fields to achieve year 2000 compliancy includes examining an original database to ascertain the location of date fields, creating a supplementary PALM file that includes fully expanded date fields representative of corr |
| 5894537 |
Dispersion managed optical waveguide |
April 13, 1999 |
| A single-mode optical waveguide fiber designed to limit power penalty due to four wave mixing and a method of making the waveguide is disclosed. Variations in properties, e.g., radius or refractive index, of the waveguide fiber core provide a total dispersion which varies along the l |
| 5867616 |
Polarization mode coupled single mode waveguide |
February 2, 1999 |
| A single mode optical waveguide having reduced polarization mode dispersion and a method for making such a waveguide is disclosed. Perturbations are introduced into the waveguide core to couple power between the two polarization modes. A model calculation shows that the perturbation leng |
| 5823544 |
Anti-abrasion and rockering system for an in-line skate |
October 20, 1998 |
| An anti-abrasion and rockering system for an in-line skate. The skate includes a skate boot mounted on a chassis. The chassis includes two sidewalls which are parallel and opposite to each other. Each sidewall has a row of holes formed therein, such that the holes on the first sidewall |
| 5822487 |
Fiber for reduced polarization effects in amplifiers |
October 13, 1998 |
| A single mode optical fiber suitable for use in an amplified fiber optic system which includes an inner glass core doped with a rare earth element and an outer transparent glass cladding. The fiber exhibits a plurality of mode coupling sites formed at regular intervals along the length o |
| 5812978 |
Wheelchair voice control apparatus |
September 22, 1998 |
| A voice-controlled wheelchair has a control system having a plurality of modes of operation in each of which only a limited number of commands for moving the wheelchair are executed. The commands are entered by a throat-engaging microphone, and backup commands are also recognized, in |
| 5809500 |
System for converting programs and databases to correct year 2000 processing errors |
September 15, 1998 |
| A method for processing or modifying programs and databases containing abbreviated date fields to achieve year 2000 compliancy includes examining an original database to ascertain the location of date fields, creating a supplementary PALM file that includes fully expanded date fields |
| 5755450 |
Braking system for an in-line skate |
May 26, 1998 |
| A braking system for an in-line skate. The skate includes a boot mounted on a chassis. A cuff is rotatably mounted on the chassis. The chassis has a plurality of wheels rotatably mounted thereon. The braking system for the skate includes a brake pad housing which is either fixedly or piv |
| 5704960 |
Method of forming an optical fiber for reduced polarization effects in amplifiers |
January 6, 1998 |
| A single mode optical fiber suitable for use in an amplified fiber optic system which includes an inner glass core doped with a rare earth element and an outer transparent glass cladding. The fiber exhibits a plurality of mode coupling sites formed at regular intervals along the length o |
| 5703975 |
Interferometric switch |
December 30, 1997 |
| A compact monolithic interferometric switch such as a Mach-Zehnder switch is formed such that one of the waveguide paths between the input and output couplers contains a material having exhibits a resonant nonlinearity, whereby its refractive index changes when pump power propagates |
| 5636300 |
MxO multiplex demultiplex component |
June 3, 1997 |
| An M.times.O multiplex/demultiplex device is disclosed. An M.times.N coupler is connected to an N.times.O coupler by phase shifting means. The phase shifting means provide N paths between the couplers, each path having an optical path length different from every other optical path le |
| 5613028 |
Control of dispersion in an optical waveguide |
March 18, 1997 |
| Disclosed is a single mode optical waveguide fiber having periodic perturbations in the core to provide a birefringence which mixes the polarization modes of launched light. In addition, perturbations are introduced into the core which serve to manage total dispersion. The total disp |
| 5504829 |
Optical fiber for soliton transmission and method of making |
April 2, 1996 |
| A single-mode optical fiber suitable for the transmission of solitons has a refractive index profile that changes along the length of the fiber to provide a fiber dispersion that monotonically decreases along the fiber from one end thereof to the other. The fiber includes a core of maxim |
| 5483612 |
Increased capacity optical waveguide |
January 9, 1996 |
| An compound core optical waveguide fiber designed for high data rate or single channel or WDM systems which may include optical amplifiers. The waveguide is characterized by a core having two or three regions wherein the refractive index can be varied. The relative size of the regions ma |
| 5418870 |
Coaxial coupler with integrated source/ring detector |
May 23, 1995 |
| The invention features an optical two-way transmission-receiver communications system utilizing a coaxial coupler having a ring waveguide and a core waveguide. A surface of an integrated source/ring detector substrate is positioned adjacent said coaxial coupler endface. A ring detect |
| 5351325 |
Narrow band Mach-Zehnder filter |
September 27, 1994 |
| A Mach-Zehnder filter includes an input coupler for splitting an input signal into N equal output signals, where N>2, and a signal combining coupler for combining N optical signals into a single output signal. It further includes N optical waveguide fibers for connecting the N outputs |
| 5339372 |
Low loss coupler |
August 16, 1994 |
| A low loss fiber optic coupler of the type wherein a plurality of single-mode optical fibers are fused together along a portion of the lengths thereof to form a coupling region. Each fiber includes a core and a cladding, the lowest refractive index of the fiber claddings being n.sub. |
| 5295210 |
Optical waveguide fiber achromatic coupler |
March 15, 1994 |
| An achromatic fiber optic coupler of the type wherein three single-mode optical fibers are fused together along a portion of the lengths thereof to form a coupling region. Each fiber includes a core and a cladding, the lowest refractive index of the fiber claddings being n.sub.2. The fib |
| 5295205 |
Environmentally stable monolithic Mach-Zehnder device |
March 15, 1994 |
| A monolithic, environmentally stable Mach-Zehnder device is formed by threading first and second dissimilar optical fibers through the bore of a glass tube. The tube is evacuated and heated to collapse it onto the fibers. The tube is further heated and stretched at two spaced locations |
| 5017206 |
Method of providing a 1xN fiber optic coupler |
May 21, 1991 |
| A fiber optic coupler is formed by assembling a coupler preform having two concentric glass tubes having a gap between them. The shape and/or size of the inner tube relative to the shape and/or size of the outer tube is such that a plurality of output optical fibers can be equally spaced |
