Lucent Technologies Inc.

Ofs Fitel, LLC

At&t Bell Laboratories

Furukawa Electric North America, Inc.

Fitel USA Corporation

At&t Corp.

Other

Furakawa Electric North America, Inc.

Dfs Fitel LLC

Ofs Fitec, LLC

Cfs Fitel, LLC

Kurukawa Electric North America, Inc.

David John DiGiovanni

Man Fei Yan

Kenneth L Walker

Robert Scott Windeler

Siddharth Ramachandran

Daryl Inniss

Paul S Westbrook

John Michael Fini

William Alfred Reed

Andrew Douglas Yablon

John L Zyskind

Tristan Kremp

George Edward Oulundsen, Iii

Ashish Madhukar Vengsarkar

James W Sulhoff

Eric A Swanson

Jeffrey W Nicholson

Clinton R Giles

Poul Kristensen

Sandra Greenberg Kosinski

Marc Mermelstein

Robert Lingle, Jr

Durgesh Vaidya

Peter Ingo Borel

Yun C Chung

Brian Mangan

Michael Fishteyn

Yoshihiro Emori

Clifford Headley

Stephen G Grubb

Herman M Presby

Allan James Bruce

Benjamin John Eggleton

Paul Francis Wysocki

Jonathan A Nagel

Julian Stone

Jay R Simpson

Mikhail Sumetsky

Clifford E Headley

Steven Eugene Golowich

Karsten Rottwitt

Torben Erik Veng

Sean L Jones

Frank Vincent DiMarcello

Vitaly Mikhailov

Xinli Jiang

Ralph Stephen Jameson

John E Pacini

Richard G Smart

Raja A Ahmad

Sandeep Prabhakar Pandit

Michael LuValle

Juhi Chandalia

Xiang Liu

Jefferson L Wagener

Victor Mizrahi

Joseph Earl Ford

John Burnette MacChesney

David Alan Rockwell

Vladimir V Shkunov

Andrew John Stentz

Raymond Wolfe

Lars Gruner-Nielsen

Jane Deborah LeGrange

Benyuan Zhu

John Edwin Graebner

Laura Ellen Adams

Chunhui Xu

Jon Anderson

Dennis J Trevor

Robert M Broberg

Mujibun Nisa Khan

Bernard Raymond Eichenbaum

Kazi S Abedin

Justin Boyd Judkins

Jayesh C Jasapara

Robert George Ahrens

Bera Palsdottir

Katherine Theresa Nelson

Gloria R Jacobovitz-Veselka

Vincent George Lambrecht, Jr

Michael James LuValle

Weyl-Kuo Wang

Joseph Anthony Abate

Kim Willard Womack

Gabriel Puc

Janet Renee Pedrazzani

Denise M Krol

Darryl L Brownlow

Gerald Nykolak

Stuart A Kramer

Matt Corrado

Chandra M Varma

Kyunghwan Oh

Peter Mikal Holmblad

Jae S Lee

Joseph D Evankow

Philippe C Becker

Susanne Dyrbol

Namkyoo Park

A technique for fabricating a hollow core optical fiber with a controllable core region (in terms of diameter) is based upon regulating conditions (gas flow, volume, and/or temperature) within the hollow core region during the fiber draw process. The introduction of a gas, or any change in volume or temperature of the hollow core region, allows for the diameter of the hollow core region to self-regulate as a multistructured core rod (MCR) is drawn down into the final hollow core optical fiber structure. This self-regulation provides a core region having a diameter that selected and then stabilized for the duration of the draw process. The inventive process is also useful in controlling the diameter of any selected hollow region of an MCR including, but not limited to, shunts and corner capillaries disposed around the core region.

Hollow core optical fiber with controlled diameter hollow regions and method of making the same

An optical probe includes an optical source that generates an optical beam that propagates from a proximal end to a distal end of an optical fiber that imparts a transformation of a spatial profile of the optical beam. An optical control device imparts a compensating spatial profile on the optical beam that at least partially compensates for the transformation of the spatial profile of the optical beam imparted by the optical fiber in response to a control signal from a signal processor. A distal optical source generates a calibration light that propagates through the one or more optical waveguides from the distal end to the proximal end of the optical fiber. An optical detector detects the calibration light and generates electrical signals in response to the detected calibration light. The signal processor generates the control signal to instruct the optical control device to impart the compensating spatial profile on the optical beam that at least partially compensates for the transformation of the spatial profile of the optical beam imparted by the optical fiber.

Optical probe

A hollow core optical fiber and cable combination is configured to exhibit minimal SNR and loss degradation. This is achieved by either: (1) reducing the coupling between the fundamental and other (unwanted) modes propagating within the hollow core fiber; or (2) increasing the propagation loss along the alternative. The first approach may be achieved by designing the cable to minimize perturbations and/or designing the hollow core fiber to fully separate the fundamental mode from the unwanted modes so as to reduce coupling into the unwanted modes. Whether through fiber design or cable design, the amount of light coupled into unwanted modes is reduced to acceptable levels. The second approach may be realized through either fiber design and/or cable design to suppress the light in unwanted modes so that an acceptably low level of light is coupled back into the fundamental mode.

Cabling configurations for hollow core optical fibers

A higher-order mode (HOM) fiber is configured as a polarization-maintaining fiber by including a pair of stress rods at a location within the cladding layer that provides for a sufficient degree of birefringence without unduly comprising the spatial mode profile of the propagating higher-order modes. An optical imaging system utilizing polarization-maintaining HOM fiber allows for different wavelength probe signals to be directed into different modes, useful in applications such as STED microscopy, 2D sensing, and the like.

Polarization-maintaining fiber device supporting propagation in large mode field diameters

A hollow core optical fiber and cable combination is configured to exhibit minimal SNR and loss degradation. This is achieved by either: (1) reducing the coupling between the fundamental and other (unwanted) modes propagating within the hollow core fiber, or (2) increasing the propagation loss along the alternative. The first approach may be achieved by designing the cable to minimize perturbations and/or designing the hollow core fiber to fully separate the fundamental mode from the unwanted modes so as to reduce coupling into the unwanted modes. Whether through fiber design or cable design, the amount of light coupled into unwanted modes is reduced to acceptable levels. The second approach may be realized through either fiber design and/or cable design to suppress the light in unwanted modes so that an acceptably low level of light is coupled back into the fundamental mode.

Optical probe using multimode optical waveguide and proximal processing

A higher-order mode (HOM) fiber is configured as a polarization-maintaining fiber by including a pair of stress rods at a location within the cladding layer that provides for a sufficient degree of birefringence without unduly comprising the spatial mode profile of the propagating higher-order modes. Long-period gratings are used as mode couplers at the input and output of the PM-HOM fiber, where the gratings are formed by exposing areas of the core region orthogonal to the position of the stress rods. The diameter of the stress rods (D) and displacement of the rods from the center of the core region (R) are controlled to yield a configuration with an acceptable birefringence and polarization extinction ratio (PER) within the HOM fiber, even in situations where the fiber is bent (a bend radius less than 50 cm).

A hollow core fiber has a cladding comprising a matrix of cells, wherein each cell comprises a hole and a wall surrounding the hole. The fiber further has a hollow core region comprising a core gap in the matrix of cells, wherein the core gap spans a plurality of cells and has a boundary defined by the interface of the core gap. The matrix of cells comprises a plurality of lattice cells, and a plurality of defect cells characterised by at least one difference in at least one property from that of the lattice cells. The cells at the core region boundary include lattice cells and defect cells that are arranged in a pattern so as to produce birefringence in a light propagating through the hollow core fiber. Further described is a technique for making the fiber.

High-birefringence hollow-core fibers and techniques for making same

A double-clad (DC) polarization-maintaining (PM) optical fiber comprises a core, an inner cladding, an outer cladding, and stress rods. The core has a core refractive index (n). The inner cladding is located radially exterior to the core and has an inner cladding refractive index (n), which is less than n. The stress rods are located in the inner cladding, and each stress rod has a stress rod refractive index (n), which is substantially matched to n. The outer cladding is located radially exterior to the inner cladding. The outer cladding has an outer cladding refractive index (n), which is less than n.

Polarization-maintaining (PM) double-clad (DC) optical fiber

A hollow core fiber has a cladding comprising a matrix of cells, wherein each cell comprises a hole and a wall surrounding the hole. The fiber further has a hollow core region comprising a core gap in the matrix of cells, wherein the core gap spans a plurality of cells and has a boundary defined by the interface of the core gap. The matrix of cells comprises a plurality of lattice cells, and a plurality of defect cells characterized by at least one difference in at least one property from that of the lattice cells. The cells at the core region boundary include lattice cells and defect cells that are arranged in a pattern that define two orthogonal axes of reflection symmetry, so as to produce birefringence in a light propagating through the hollow core fiber.

A broadband fiber optic sensor array is formed along a length of single mode optical fiber, with the individual sensing elements formed by introducing local perturbations (e.g., changes in diameter) along the length of the optical fiber. The sensor array requires only a single light source input and a single (conventional) optical spectrum analyzer output and is capable of providing individual measurements (such as local temperature or pressure) for each sensing element disposed along the length of fiber. The individual transmission spectra of the sensing elements forming the array are smooth and strongly overlap, and a method has been developed for determining the characteristics of the individual elements from the variations in the total (combined) transmission spectrum.

Broadband fiber sensor array

Systems and methods for reducing cost and amplifier module size are disclosed. One system comprises an arrayed optical fiber amplifier that uses a ribbonized fiber that permits reduction of amplifier module size and also reduction in the cost of manufacturing that are not readily achievable in other currently-available systems.

Arrayed optical fiber amplifier using ribbonized erbium-doped fiber

High aspect ratio core optical fiber designs, which could be semi-guiding, including a core region having a first refractive index and a high aspect ratio elongated cross-section along a slow axis direction, are described. An internal cladding having a second refractive index sandwiches the core and acts as a fast-axis signal cladding. The core has an edge region at both of its short edges that is in contract with edge-cladding regions having a barbell shape. The refractive index of the core regions, the refractive index of the internal claddings, and the refractive index of the edge-cladding regions, are selected so as to maximize the optical power of a lowest-order mode propagating in the fiber core, and to minimize the optical power of the next-order modes in the fiber core. A process to fabricate such a high aspect ratio core fiber is also provided.

Barbell optical fiber and method of making the same

A technique is described for terminating an optical fiber with low backreflection. At a selected end of the optical fiber segment, an endface is formed at a selected angle relative to the fiber axis. A suitable material is deposited onto the angled endface to form an angled reflective surface. The angled reflective surface is configured such that light propagating along the waveguide to the selected end of the optical fiber segment is reflected back into the optical fiber segment at an angle that prevents coupling of the reflected light into the fiber core. The reflected light is dissipated along the length of the fiber segment.

Termination of optical fiber with low backreflection

Growing community of inventors

Mountain Lakes, NJ, United States of America

David John DiGiovanni