Patents Issued in March 6, 2003
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Publication number: 20030044114Abstract: A light delivery apparatus comprises a waveguide, a pump source and a fluorescent emitter. Pump light from the pump source is transmitted through the waveguide to the emitter. The emitter comprises a plurality of quantum dots. The pump light is absorbed by the quantum dots and re-emitted as light with a predetermined wavelength that is longer than the wavelength of the pump light. The predetermined wavelength of the emitted light is selected to match one or more activation wavelength(s) of a photoactivated chemical.Type: ApplicationFiled: September 6, 2001Publication date: March 6, 2003Inventor: David G. Pelka
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Publication number: 20030044115Abstract: The invention provides an optical coupling system having a first collimator assembly having a first optical axis, a second collimator assembly having a second optical axis, an optical device, such as a tap coupler, an isolator or a WDM filter, disposed along an optical path between the first and the second collimator assembly, a first sleeve for containing the first collimator assembly, said first sleeve having an angled end face for forming a first angle, and a second sleeve for containing the second collimator assembly, said second sleeve having an end face for abutting the angled end face of the first sleeve such that the first optical axis of the first collimator assembly intersects with the second optical axis of the second collimator assembly at a coupling angle. The first sleeve and the second sleeve are relatively rotatable to each other for changing the coupling angle. Furthermore, the end face of the second sleeve is angled for forming a second angle.Type: ApplicationFiled: August 26, 2002Publication date: March 6, 2003Inventor: Warren Hale Lewis
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Publication number: 20030044116Abstract: This invention discloses an optical device including at least one first substrate defining a multiplicity of optical fiber positioning grooves, a multiplicity of optical fibers fixed in each of said multiplicity of optical fiber positioning grooves on the at least one first substrate, whereby the multiplicity of optical fibers lie in an optical fiber plane and the ends of each of the multiplicity of optical fibers lie substantially in a first predetermined arrangement in the optical fiber plane,a second substrate fixed onto the at least one first substrate such that an edge of the second substrate extends beyond the ends of each of the multiplicity of optical fibers, a lens assembly including a third substrate, and a lens fixed onto the third substrate, the lens assembly being mounted onto the second substrate such that the lens lies in a second predetermined arrangement with respect to the ends of each of the multiplicity of optical fibers, whereby the separation between the lens and the ends of each of theType: ApplicationFiled: September 27, 2002Publication date: March 6, 2003Applicant: CHIARO NETWORKS LTD.Inventors: Eyal Shekel, Eli Rafaeli, Yedidya Ariel, Guy Matmon, Daniel Majer
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Publication number: 20030044117Abstract: In a diffraction grating device (1), index modulations are formed along the longitudinal direction of an optical fiber (10) serving as an optical waveguide. The optical fiber (10) has a core region (11), an inner cladding region (12), and an outer cladding region (13) sequentially from the optical axis center. Index modulations are formed in both the core region (11) and the inner cladding region (12) of the optical fiber (10) in each of a plurality of regions A1 to AN (N is an integer; N≧2) separated from each other along the longitudinal direction of the optical fiber (10). In the diffraction grating device (1), regions An (n=1 to N) in which index modulations are formed in both the core region (11) and the inner cladding region (12) and regions Bn (n=1 to N−1) in which no index modulations are formed alternately exist along the longitudinal direction.Type: ApplicationFiled: June 28, 2002Publication date: March 6, 2003Inventors: Kiyotaka Murashima, Ken Hashimoto, Toru Iwashima
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Publication number: 20030044118Abstract: Composite optical waveguide structures or mode transformers and their methods of fabrication and integration are disclosed, wherein the structures or mode transformers are capable of bi-directional light beam transformation between a small mode size waveguide and a large mode size wavguide. One aspect of the present invention is directed to an optical mode transformer comprising a waveguide core having a high refractive index contrast between the waveguide core and the cladding, the optical mode transformer being configured such that the waveguide core has a taper wherein a thickness of the waveguide core tapers down to a critical thickness value, the critical thickness value being defined as a thickness value below which a significant portion of the energy of a light beam penetrates into the cladding layers surrounding the taper structure thereby enlarging the small mode size.Type: ApplicationFiled: October 19, 2001Publication date: March 6, 2003Applicant: PHOSISTOR TECHNOLOGIES, INC.Inventors: Yan Zhou, Seng-Tiong Ho
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Publication number: 20030044119Abstract: In a planar waveguide optical circuit 1, a inclined groove 3 is formed at an inclination angle &thgr; with respect to the vertical axis so as to cross optical waveguides 2n. A reflection filter 4 structured such that the difference in reflectivity between orthogonal polarization is compensated for with respect to signal light is installed inside the groove 3, the reflected light from the reflection filter 4 is detected by the photodetectors 6n, and the optical intensity of the signal light is monitored. This makes it possible to accurately monitor the optical intensity regardless of the polarization state of the signal light. Also, since the inside of the groove 3 including the reflection filter 4 is sealed with a filler resin 5, any deterioration in long-term stability that would otherwise be caused by contamination of these components is prevented.Type: ApplicationFiled: March 20, 2002Publication date: March 6, 2003Inventors: Takashi Sasaki, Takeo Komiya, Yasushi Fujimura, Masahide Saito
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Publication number: 20030044120Abstract: A method for aligning an optical fibre to a semiconductor laser device (1) having an active lasing region (2) and at least one fiducial (3) made of the same layer as the active lasing region (2). The laser die is etched with HCI to expose a top surface of the fiducial (3), whilst masking the die at least in the region of the active lasing region. The exposed surface of the fiducial (3) can then be detected in all three X, Y and Z dimensions so that an exact position of the active lasing region (2) can be calculated. The optical fibre can then be accurately aligned with the active lasing region based on the exact calculated position thereof.Type: ApplicationFiled: August 5, 2002Publication date: March 6, 2003Applicant: Agilent Technologies, Inc.Inventors: Christine Mignosi, Ken Kennedy, Herbert Lage, Serian Southgate, Andrea Leeks
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Publication number: 20030044121Abstract: An optical transceiver module for a communication device. The communication device is provided with a printed circuit board, a socket, and a cage with an engaging member. The optical transceiver module comprises a chassis, an optical subassembly, a housing, and a separating portion. The chassis, having a protrusion, is disposed inside the cage in a removable manner. When the optical transceiver module is located inside the communication device, the chassis is located inside the cage and the protrusion engages the engaging member. The optical subassembly is disposed on the chassis. When the optical transceiver module is located inside the communication device, the optical subassembly connects with the socket. The housing is attached to the chassis so that the optical subassembly is located between the chassis and the housing.Type: ApplicationFiled: March 22, 2002Publication date: March 6, 2003Inventor: Chinhum Shang
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Publication number: 20030044122Abstract: A first clip (22, 70) is secured to the shank portions (24) of the plugs (18) at the ends of two optical cables (12, 16). A second clip (22, 70) is connected to the shanks (24) of the plugs (18) at the ends of two other optical cables (10, 14). The clips (22, 70) connect the plugs (18) together, making them be duplex plugs. The duplex plugs are insertable into socket openings formed in the ends of a connector housing (20).Type: ApplicationFiled: September 5, 2001Publication date: March 6, 2003Inventor: Hsin Lee
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Publication number: 20030044123Abstract: A ferrule assembly, in a preferred embodiment, having a first ferrule, a second ferrule, and at least two alignment members to align the first and second ferrules during mating is provided. The first ferrule, the second ferrule and the alignment members interact at the mating interface of the first and second ferrules to provide three constraint lines. In one embodiment, the first ferrule has a body with at least one channel for receiving at least one optical fiber. The first ferrule body includes a first surface portion for retaining a first alignment member and a second surface portion for retaining a second alignment member, the first and second surface portions being V-shaped. The second ferrule has a body with at least one channel for receiving at least one optical fiber.Type: ApplicationFiled: July 16, 2002Publication date: March 6, 2003Inventors: Sepehr Kiani, R. Ryan Vallance
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Publication number: 20030044124Abstract: This invention is a convertible multi-diameter sleeve for optical fiber connectors to allow optical fiber cables with plug ferrules of different internal and external diameters to be pushed into the sleeve and connected with precise core alignment keeping stable conditions. The sleeve has at least one slot extending part way along the length of the sleeve.Type: ApplicationFiled: September 4, 2001Publication date: March 6, 2003Inventor: Ken Saitoh
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Publication number: 20030044125Abstract: Generally, a fiber optic connector having at least one wafer, wherein the wafer holds at least one optical fiber, is provided. The wafer includes a retractable shroud, a body to receive the retractable shroud, and at least one biasing member. The biasing member is capable of being biased when the wafer contacts a corresponding mating wafer to cause the shroud to retract. In one specific detailed perspective and embodiment of the invention, the wafer as stated further includes the retractable shroud having a door that preferably opens outwardly and at least one ferrule that holds the optical fiber, where the ferrule is provided with an alignment pin. The biasing member includes a first biasing member, a second biasing member and a third biasing member. The first biasing member is capable of being biased to cause the alignment pin of the ferrule to open the door of the retractable shroud. The second biasing member is capable of being biased to cause the retractable shroud to be received by the body.Type: ApplicationFiled: July 16, 2002Publication date: March 6, 2003Inventors: Sepehr Kiani, Richard F. Roth
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Publication number: 20030044126Abstract: A leading fiber penetrates through a holding element and is optically coupled to an optical element placed in a package. An external cord fiber longer than the leading fiber passes a through hole of a glass sleeve and is connected to the leading fiber to form an optical fiber composed of the leading fiber and the external cord fiber. The holding element is inserted into the glass sleeve to place a fusion-spliced portion between the leading fiber and the external cord fiber in the through hole of the glass sleeve. UV hardening resin hardened by receiving ultraviolet rays is packed and hardened in the through hole of the glass sleeve to cover the fusion-spliced portion with the UV hardening resin and the glass sleeve.Type: ApplicationFiled: March 4, 2002Publication date: March 6, 2003Inventors: Minoru Kawano, Shinichi Ooe, Katsuhiko Goto, Toshio Sogo
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Publication number: 20030044127Abstract: In one embodiment of a fiber optic connection system of the present invention, there is provided a first fiber optic connector attachable to a first printed circuit board and a second fiber optic connector attachable to a second printed circuit board and mateable to the first fiber optic connector. The first fiber optic connector has separable first wafer modules, each of which hold at least one optical fiber, and separable first latching modules removably attached to the separable first wafer modules. The second fiber optic connector includes separable second wafer modules, each of which hold at least one optical fiber, and separable second latching modules removably attached to the separable second wafer modules. The separable second latching modules are engageable to the separable first latching modules to mate the first and second fiber optic connectors.Type: ApplicationFiled: July 16, 2002Publication date: March 6, 2003Inventors: Richard F. Roth, Sepehr Kiani
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Publication number: 20030044128Abstract: Optoelectronic packaging assemblies for optically and electrically interfacing an electro-optical device to an optical fiber and to external circuitry. An optoelectronic packaging assembly includes a submount for holding an optical bench with an electro-optical device. Electrically conductive pins provide electrical contact to the electro-optical device. The optoelectronic packaging assembly includes an optical input receptacle for receiving an optical ferrule and an optical fiber. The optical input receptacle assists optical coupling of the electro-optical device to the optical fiber. The optoelectronic packaging assembly provides for cooling using a heat-sink or a thermal-electric-cooler. Beneficially, the optoelectronic packaging assembly is sealed using a cover.Type: ApplicationFiled: August 29, 2001Publication date: March 6, 2003Inventors: Stanford W. Crane, Zsolt Horvath
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Publication number: 20030044129Abstract: A release mechanism for manually securing a pluggable fiber optic transceiver to a cage mounted on a host circuit board. The release mechanism includes a pivoting faceplate connected to a transceiver housing such that the faceplate is rotatable from a first position in which the faceplate is positioned over a front surface of the housing to a second position in which the faceplate is pivoted away from the front surface of the housing. The release mechanism also includes a lever that disengages a boss from an opening formed in a resilient transceiver latch of the cage when the faceplate is in the second position. In one embodiment the boss is mounted on the housing, and the lever pushes the transceiver latch away from the boss. In another embodiment, the boss is mounted on the lever.Type: ApplicationFiled: August 31, 2001Publication date: March 6, 2003Inventors: Michael E. Ahrens, Neil P. Cannon
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Publication number: 20030044130Abstract: Optoelectronic packaging assemblies for optically and electrically interfacing a protected electro-optical device or system to both an optical fiber and to external circuitry. Such assemblies are comprised of body components that are comprised of plastic that coated or plated with a conductive material. Electrical contact pins in the form of transmission lines are used to couple external electrical signals with the package. The optoelectronic packaging assemblies are dimensioned with small cavities and with steps, breaks, walls, and/or fins molded into the body components. The optoelectronic packaging assemblies further include an optical input receptacle for receiving an optical ferrule and an optical fiber. The optoelectronic packaging assembly provides for cooling, such as by heat sink fins and/or a thermal-electric-cooler. The transmission line pins and body components are dimensioned to mate with a standardized circuit board having transmission line traces.Type: ApplicationFiled: February 14, 2002Publication date: March 6, 2003Inventors: Stanford W. Crane, Myoung-Soo Jeon, Joshua G. Nickel, Zsolt Horvath
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Publication number: 20030044131Abstract: A temperature-controlled optoelectronic module that includes a module housing, a laser mount structure for affixing a laser package in the module housing, an optical fiber receptacle structure disposed adjacent to the laser mount structure, a thermal isolator affixed between the laser mount structure and the optical fiber receptacle structure, and a temperature controller coupled to the laser mount structure and operable to regulate temperature of the laser package is disclosed. In the absence of the thermal isolator, a “thermal short” may be created between the module housing and the laser package, substantially reducing the efficiency of the temperature controller. The presence of the thermal isolator eliminates the “thermal short,” substantially increases the effectiveness of the temperature controller and enables the miniaturization of temperature-controlled optoelectronic transceiver modules.Type: ApplicationFiled: March 18, 2002Publication date: March 6, 2003Inventors: James Stewart, Jan Lipson
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Publication number: 20030044132Abstract: First and second temperature control modules are disposed on a bottom surface inside a package. The first module has a prism, a wavelength filter, and a mount that holds a photodiode disposed thereon, thereby to form a wavelength monitoring section. The second module has an isolator, a lens holder that holds a lens, a laser mount on which a laser device is fixed, and a lens holder that holds a lens disposed thereon, thereby to form a laser emitter. An insulating plate is disposed between the first and second modules so as to prevent the occurrence of interference between the first and second modules.Type: ApplicationFiled: August 28, 2002Publication date: March 6, 2003Applicant: The Furukawa Electric Co., Ltd.Inventors: Hideyuki Nasu, Takehiko Nomura
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Publication number: 20030044133Abstract: The present invention provides an optical module in which the level of the lead frame coincides with the optical axis of the fiber. The module 1 comprises a container 4, a subassembly 2, a base member 5 and a lead frame 6. The subassembly 2 includes a substrate, on which the semiconductor optical device and the optical fiber are mounted. The container 4 has a pair of surface. One surface is securing the lead frame thereon while the base member is attached to the other surface of the container 4. The base member comprises an island portion and a frame portion. The subassembly 2 is placed on the island and the frame portion is fixed to the container 4. Island support portions connecting the island portion to the frame portion is deformed in the molding process, thus aligning the subassembly 2.Type: ApplicationFiled: August 29, 2002Publication date: March 6, 2003Inventors: Satoshi Yoshikawa, Hiromi Kurashima, Yasushi Fujimura
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Publication number: 20030044134Abstract: The invention relates to an optical sub-assembly package as well as a method of manufacturing the optical sub-assembly package. The optical sub-assembly package according to the present invention can be broken down into two distinct sub-sections, a waveguide assembly and an optical assembly. The waveguide assembly includes an optical fiber, with a ferrule on one end thereof, fixed to a GRIN lens. The optical assembly includes a transducer, e.g. a photodiode, for converting between electrical and optical signals. The waveguide assembly is mounted in a mounting sleeve, while the optical assembly is mounted in a housing. During the manufacturing process the waveguide assembly can be moved in the z-axis away from the optical assembly within the mounting sleeve, and moved in the x-y plane along with the mounting sleeve. By positioning the waveguide assembly outside of the housing, many of the problems inherent in the prior art assemblies, i.e. hermeticity and misalignment, are avoided.Type: ApplicationFiled: August 2, 2002Publication date: March 6, 2003Inventor: William J. Strachan
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Publication number: 20030044135Abstract: The present invention includes an apparatus for combining a water barrier fluid to a bundle of optical fibers including an entrance die having an orifice which is dimensioned to allow for a bundle of optical fibers to be drawn therethrough. Also, an exit die having an orifice is provided. The entrance die and the exit die, respectively, have inner sides which define a cavity. The cavity is in fluid communication with the orifice of the entrance die and the orifice of the exit die, such that a gap is formed at a meeting point between the cavity and the respective orifices of the entrance and the exit die. The gap is radially surrounded by an extension of the cavity to define a critical flow region. A plurality of baffles are formed in the exit die which are operative to inject fluid into the cavity. Also provided is a main body which supports the entrance die and the exit die. The main body includes a passageway that is in fluid communication with the plurality of baffles.Type: ApplicationFiled: September 6, 2001Publication date: March 6, 2003Applicant: ALCATELInventor: Philip C. Sturman
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Publication number: 20030044136Abstract: Disclosed are an optical fiber cable comprising an optical fiber and at least one covering layer formed on the outer periphery of the optical fiber, at least one layer of the covering layer being made of a material comprising a resin component containing a polyamide polymer, wherein a flexural modulus E upon displacement of 1 mm is within a range from 2 to 15 (N/mm) and the optical fiber cable passes a flame resistance test in accordance with DIN 72551-5, and an optical fiber cable with a plug using the optical fiber. Therefore, they have excellent flame resistance and good handling properties.Type: ApplicationFiled: June 21, 2002Publication date: March 6, 2003Inventors: Kazuki Nakamura, Takeshi Kitayama, Takara Yamamoto, Hiroe Kubo, Yoshimi Kamimura, Jun Okumura
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Publication number: 20030044137Abstract: A dry optical fiber cable, for voice, video and data telecommunication based on a plurality of a loosely fitted tubes placed longitudinally and surrounding a central reinforcement element, said tubes accommodating at least one or several optical fiber filaments. This dry optical fiber cable is characterized because in the internal area, between the central reinforcement element and the plurality of tubes, it has a first dry protection layer; the interior assembly is then externally protected by a second dry protection. It then has a polyethylene cover followed by the third dry protection and finally a polyethylene cover.Type: ApplicationFiled: December 18, 2001Publication date: March 6, 2003Inventor: Ruben Mandujano Lopez
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Publication number: 20030044138Abstract: Provided is an optical fiber drop cable, which protects an accident by lightning strike having also a low cost, and a manufacturing method thereof.Type: ApplicationFiled: September 3, 2002Publication date: March 6, 2003Applicant: FUJIKURA LTD.Inventors: Masahiro Kusakari, Kazunaga Kobayashi, Shimei Tanaka, Keiji Ohashi
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Publication number: 20030044139Abstract: An optical cable (10) includes one or more tubes (120), each containing a number of optical fibers (101), and a plastic jacket (160) that encloses the tube(s). A pair of diametrically opposed rods (300-1, 300-2) are at least partially embedded in the polyethylene jacket and are made from continuous-filament glass fibers that are embedded in epoxy. Each rod has a compressive stiffness that is effective to inhibit substantial contraction of the cable, and a tensile stiffness that is effective to receive tensile loads without substantial transfer of such loads to the glass fibers. Each dielectric rod includes a thin layer (330) of a frictional adhesion coating that provides a controlled adhesion between the rod and the jacket of between 50 and 300 lb./in2. Whereas dual-rod cable designs have a preferred bending plane that passes through the rods, controlled adhesion between the rods and the jacket enables the cable to be easily bent in other planes and to be blown through ducts having multiple corners.Type: ApplicationFiled: September 25, 2002Publication date: March 6, 2003Inventors: Richard Hartford Norris, Richard D. Small, Phillip Maurice Thomas, Peter A. Weimann
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Publication number: 20030044140Abstract: The present invention relates to a composition for preparing optical fiber coatings, the composition including a polymerizable base composition, containing at least one monomer and optionally at least one oligomer, wherein the polymerizable base composition is substantially free of unsaturated epoxidized diene polymers, and a tackifier present in an amount effective to modify a time-sensitive rheological property of a polymerization product of the composition. Another aspect of the present invention relates to a method of modifying a time-sensitive theological property of an optical fiber coating by introducing into a polymerizable composition a tackifier in an amount effective to modify a time-sensitive rheological property of the polymerization product of the polymerizable composition. Also disclosed are an optical fiber, a fiber optic ribbon, and a fiber bundle that contain coating(s) prepared from a composition of the present invention.Type: ApplicationFiled: December 21, 2000Publication date: March 6, 2003Inventors: Edward J. Fewkes, Gregory F. Jacobs, Kenneth R. Jones, Huan-Hung Sheng, Frederic C. Wagner, Michael J. Winningham
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Publication number: 20030044141Abstract: A single-mode optical fiber includes a core, a cladding, and a coating. The cladding of the single-mode optical fiber has an outer diameter of about 125.0 &mgr;m±0.3 &mgr;m. A plurality of the single-mode optical fibers may be associated with at least one flexible polymeric material forming an fiber optic assembly and a method of manufacturing the same. The fiber optic assembly, for example, may be a ribbon, a cable, a pigtail, an optical circuit, or a portion of a ribbon stack. Additionally, the optical fiber may include other suitable geometric properties and/or characteristics, such as, a core to cladding concentricity of about 0.2 &mgr;m or less and/or a mode-field diameter of about 9.2 &mgr;m±0.3 &mgr;m at a source wavelength of 1310 nm.Type: ApplicationFiled: August 31, 2001Publication date: March 6, 2003Inventors: Stuart R. Melton, Scott M. Torrey
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Publication number: 20030044142Abstract: The present invention discloses a loose tube ribbon optical cable, which includes at least one reinforced ribbon optical fiber bundle that includes a multifiber cable arrayed in parallel, a ribbon optical fiber bundle formed of multi-layered ribbon optical fibers for coating the multifiber cable, and a pair of reinforcing layers with both edges bent towards the periphery of the ribbon optical fiber bundle, the pair of reinforcing layers being formed on the outside of the bundle. The loose tube is packed with the reinforced ribbon optical fiber bundle, and an outer coating disposed in a peripheral of the ribbon optical cable, enclosing the loose tube(s).Type: ApplicationFiled: March 19, 2002Publication date: March 6, 2003Inventor: Kyung-Tae Park
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Publication number: 20030044143Abstract: The invention relates to a method of making an optical fiber and an optical fiber made in accordance with the inventive method. The method includes the step of drawing an optical fiber from a multiple crucible apparatus, wherein one of the crucibles of the apparatus has a non-symmetrical orifice. The inventive fiber has at least a core and cladding. At least one section of the inventive fiber includes an orientation element.Type: ApplicationFiled: August 30, 2001Publication date: March 6, 2003Inventors: Jackson P. Trentelman, James G. Anderson, Ernest E. Brand
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Publication number: 20030044144Abstract: An optical component and a method of making the same are provided. In one embodiment, the optical component is a low-OH optical fiber that includes a core and a cladding. The optical component is treated by immersion in a hydrogen gas atmosphere at a predetermined pressure, at a predetermined temperature and for a predetermined time period such that intrinsic and impurity defects of the optical component are destroyed. The method of making the optical component includes providing a preform having a content of OH-groups in the amount of about 0.1 to about 10.0 ppm and a content of chlorine in the amount of 0 to about 1000 ppm and drawing the preform to elongate it to form an optical component from the preform. The optical component is immersed in a hydrogen gas atmosphere at a predetermined pressure, at a predetermined temperature and for a predetermined time period that is sufficient to destroy intrinsic and impurity defects of the optical component.Type: ApplicationFiled: May 3, 2002Publication date: March 6, 2003Inventors: Gary W. Nelson, Valery Khalilov
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Publication number: 20030044145Abstract: The invention provides a fiber with continuously changing chromatic dispersion; it limits the quantity of dispersion-compensating fiber needed in a transmission system to compensate the cumulative chromatic dispersion in the line fiber. The fiber has a higher chromatic dispersion at a first end than at the other end, referred to as the second end. The chromatic dispersion varies along the fiber, decreasing over at least a portion of the fiber. At the first end the chromatic dispersion can be of the order of the dispersion of a conventional line fiber, i.e. close to 8 ps/(nm.km). At the second end the chromatic dispersion can have a value of the order of 4 ps/(nm.km). The fiber is used as the line fiber in a transmission system at the beginning of a section between two repeaters.Type: ApplicationFiled: August 1, 2002Publication date: March 6, 2003Applicant: ALCATELInventors: Ludovic Fleury, Louis-Anne de Montmorillon, Pierre Sillard, Pascale Nouchi
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Publication number: 20030044146Abstract: An optical communication system has a configuration in which an optical transmission line is laid between a repeater (transmitter) and another repeater (receiver). The optical transmission line is formed by fusion-splicing a first optical fiber on the upstream side and a second optical fiber on the downstream side. The first optical fiber has a transmission loss of 0.25 dB or less, and an effective area of 80 &mgr;m2 or above (preferably 100 &mgr;m2 or above), at a wavelength of 1550 nm, which is the wavelength of signal light. The second optical fiber is connected to the downstream end of the first optical fiber and has positive dispersion regions and negative dispersion regions which are alternately arranged along the longitudinal direction and whose chromatic dispersions at a wavelength of 1550 nm are positive and negative, respectively.Type: ApplicationFiled: August 27, 2002Publication date: March 6, 2003Inventors: Toshiaki Okuno, Masayuki Nishimura
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Publication number: 20030044147Abstract: An optical fiber 1 comprising a glass portion 2 having a core 2a and a cladding 2b, and one or more covering layers 3 formed around the glass portion 2, in which an arrangement form of the covering layer 3 with respect to the glass portion 2 in cross section perpendicular to a longitudinal direction thereof is changed continuously in the longitudinal direction thereof.Type: ApplicationFiled: September 30, 2002Publication date: March 6, 2003Inventors: Koji Shimoda, Yuji Kubo, Makoto Shimizu
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Publication number: 20030044148Abstract: Disclosed is a dispersion controlled optical waveguide fiber, and telecommunication systems using such a waveguide fiber, in which the end to end total dispersion and total dispersion slope is controlled by varying the refractive index profile along the fiber length. The waveguide fiber includes length portions each of which is characterized by total dispersion having a magnitude and sign and total dispersion slope having a magnitude and sign. The magnitudes and signs of total dispersion and total dispersion slope of respective length portions are chosen to provide for the optical waveguide fiber a desired end to end total dispersion and total dispersion slope. An advantage is achieved in the present invention by designing the refractive index profiles of the length portions to have total dispersion and total dispersion slope of opposite sign.Type: ApplicationFiled: August 19, 2002Publication date: March 6, 2003Inventors: George E. Berkey, Venkata A. Bhagavatula, Lutfur Rahman, V. Srikant
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Publication number: 20030044149Abstract: A light guide is disclosed and includes a flexible elongated tube having an inner surface and first and second ends. A non-supercritically dried hydrophobic aerogel film is affixed to the inner surface of the tube as a cladding layer, and a fluid core is disposed within the tube. The fluid core has a refractive index greater than the refractive index of the aerogel cladding film.Type: ApplicationFiled: July 31, 2001Publication date: March 6, 2003Inventors: Hanafi R. Fraval, C. Jeffrey Brinker
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Publication number: 20030044150Abstract: The present invention relates to an optical fibre mainly consisting of silica glass, which fibre comprises:Type: ApplicationFiled: June 18, 2002Publication date: March 6, 2003Applicant: Draka Fibre Technology B. V.Inventors: Andries Heero Van Bergen, Mattheus Jacobus Nicolaas Van Stralen, Mark Peter Marie Jetten
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Publication number: 20030044151Abstract: A method of depositing a dual layer top clad for an optical waveguide of a planar lightwave circuit (PLC). The method includes a first step of providing a high flow rate of a Boron dopant gas for a first top cladding layer deposition process. Then, a low flow rate of a Boron dopant gas is provided for a second top cladding layer deposition process. The second top cladding layer deposition process is performed directly on the first top cladding layer deposition. The first and second top cladding layer deposition processes are combined to form a dual layer top clad of the PLC having a high Boron portion covering a plurality of optical cores and a low Boron portion covering the first portion. The first top cladding layer deposition process can comprises three deposition and anneal cycles using the high flow rate for the Boron dopant gas. The three deposition and anneal cycles are used to fill gaps between the plurality of optical cores of the PLC.Type: ApplicationFiled: August 31, 2001Publication date: March 6, 2003Inventors: Fan Zhong, Kangjie Li
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Publication number: 20030044152Abstract: The invention resides in a method of forming a waveguide structure comprising the steps of forming a silica based waveguide on a substrate; annealing one or more localised regions of said waveguide to permanently set the refractive index profile of said localised regions relative to other regions of said waveguide. In a particular form of the invention a core-forming layer is formed and selected regions of the core-forming layer are annealed to reduce their refractive, index thereby defining a core region therebetween. Other applications of the invention reside in reducing bend losses in bent waveguides, and forming long-period gratings in planar waveguides.Type: ApplicationFiled: September 4, 2001Publication date: March 6, 2003Applicant: Redfern Integrated Optics Pty LtdInventor: Michael Bazylenko
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Publication number: 20030044153Abstract: The present invention provides a method of forming a planar optical waveguide comprising the steps of forming a silica-based waveguide at a first temperature which is below a melting temperature of material from which the waveguide is formed; and annealing a region of the waveguide at a second temperature which is greater than the formation temperature and less than a melting temperature of material from which the waveguide is formed, so as to alter an effective refractive index of the region. In one embodiment the step of annealing is preceded by the step of forming a thin film heater over the region of the waveguide, the heater being capable of heating the region to the second temperature. The first temperature is preferably low (below 400° C.) to maximise the range of annealing temperatures.Type: ApplicationFiled: September 4, 2001Publication date: March 6, 2003Inventor: Michael Bazylenko
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Publication number: 20030044154Abstract: A method of forming an oxide structure and an oxide structure formed by the method. In one embodiment a lower cladding layer on a substrate is provided. At least one core layer is formed on lower cladding layer, the core layer includes boron at a concentration that produces substantially zero internal stress of said core layer. At least one upper cladding layer is formed on the core layer wherein at least one of the upper and lower cladding layers include germanium at a concentration level such that the upper and lower cladding layers exhibit substantially equivalent refractive indices.Type: ApplicationFiled: August 2, 2002Publication date: March 6, 2003Inventor: Martin Mogaard
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Publication number: 20030044155Abstract: A flexible carrier for supporting and protecting elongated items such as optical fibers is disclosed. The carrier is formed from a substrate of interlaced filamentary members which may be woven, knitted or braided together. The elongated items are interlaced with or otherwise captured by the substrate during its manufacture. Various configurations of the substrate such as flat, pleated and tubular are feasible. Capture of the elongated members may be effected by integrally woven tubes formed within the substrate, by interweaving the items as warp yarns in a woven substrate or by laying in of the items in a knitted substrate.Type: ApplicationFiled: August 30, 2002Publication date: March 6, 2003Inventor: Janice R. Maiden
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Publication number: 20030044156Abstract: A mechanically-adjustable variable optical attenuator includes an azimuthally-tapering, rotatable beam attenuator. In a plane perpendicular to the light beam to be attenuated, the projection of the beam attenuator comprises a sharp distal tip, a proximal region, and a concave curved light-blocking surface narrowing from the proximal region to the distal tip. The extent of the beam attenuator obstructing the light beam is varied by rotating the beam attenuator about a rotation axis perpendicular to the light beam direction. The beam attenuator geometry allows achieving high resolutions while limiting the beam attenuator size. The attenuated light beam can be a single-mode or multi-mode light beam.Type: ApplicationFiled: June 28, 2002Publication date: March 6, 2003Inventors: Jian J. Chen, Jianhua Wang
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Publication number: 20030044157Abstract: A method and apparatus are provided for transmitting an optical communications signal. The method includes the steps of securing an optical device onto an optically transparent substrate with an optically transparent adhesive such that an axis of transmission of the optical device passes directly through the optically transparent adhesive and a portion of the body of the optically transparent substrate, darkening a portion of the optically transparent adhesive with a laser; and transmitting light from the optical device through the darkened portion of the optically transparent adhesive such that at least some of the light from the optical device is absorbed by the darkened portion.Type: ApplicationFiled: September 5, 2002Publication date: March 6, 2003Inventors: Randy W. Wickman, Thomas Brockman, Steven C. Nelson
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Publication number: 20030044158Abstract: High index-contrast fiber waveguides, materials for forming high index-contrast fiber waveguides, and applications of high index-contrast fiber waveguides are disclosed.Type: ApplicationFiled: April 12, 2002Publication date: March 6, 2003Inventors: Wesley A. King, Emilia Anderson, Marin Soljacic, Mihai Ibanescu, Torkel Engeness, Maksim Skorobogatiy, Steven G. Johnson, Ori Weisberg, Yoel Fink, Rokan U. Ahmad, Lori Pressman
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Publication number: 20030044159Abstract: High index-contrast fiber waveguides, materials for forming high index-contrast fiber waveguides, and applications of high index-contrast fiber waveguides are disclosed.Type: ApplicationFiled: April 12, 2002Publication date: March 6, 2003Inventors: Emilia Anderson, Wesley A. King, Yoel Fink, Lori Pressman
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Publication number: 20030044160Abstract: A wave guide based light source having a phosphor film with a large two-dimensional extent and a small thickness. The phosphor film is excited by an excitation means.Type: ApplicationFiled: May 15, 2001Publication date: March 6, 2003Inventors: Michieal L. Jones, Steven M. Jaffe, Brian L. Olmsted
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Publication number: 20030044161Abstract: In the case of an output device (1) for direct output or for storage and deferred output of received audio (EAI) and video (EVI) television program data, having receiving means (3) for receiving the audio (EAI) and video (EVI) data and having memory means (11) for storing the received audio (EAI) and video (EVI) data, the memory means (11) allowing simultaneous storage of the received audio (EAI) and video (EVI) data and read-out of previously stored audio (WAI) and video (WVI) data, and having selection means (4, 5, 17, 18) for selecting audio (AAI) and video (AVI) data to be output and having output means (17, 18) for outputting the audio (AAI) and video (AVI) data to be output, in order to allow visual playback of the video data (AVI) and acoustic playback of the audio data (AAI), wherein the selection means (4, 5, 17, 18) are designed to select the video data (EVI) currently being received with the audio data (WAI) received and stored a back period (TR) ago or to select the video data (WVI) received and sType: ApplicationFiled: August 26, 2002Publication date: March 6, 2003Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventor: Michael Kandler
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Publication number: 20030044162Abstract: Techniques are provided for enforcing mandatory segments in multimedia content. Generally, a command is received and it is determined if a duration of the command affects a mandatory segment of the multimedia content. If so, the command and the duration are used to determine if the mandatory segment should be enforced and, therefore, played to a user. Additionally, a segment lifetime and mandatory level add flexibility by providing additional options to enforce mandatory segments if certain predetermined conditions are met. Finally, mandatory segments that meet predetermined criteria may be replaced by additional mandatory segments.Type: ApplicationFiled: September 4, 2001Publication date: March 6, 2003Applicant: KONINKLIJKE PHILIPS ELECTRONICS N.V.Inventor: Janevski Angel
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Publication number: 20030044163Abstract: A method and device for recording real time information on a record carrier, e.g. video on an optical disc. The information is arranged according to a recording format, e.g. DVD video, for being playable in standardized players. The information is subdivided into units and playback parameters for reproducing sequences of the units are included in the units. The format prescribes forward pointers to units that are located at a large distance from the unit which includes the forward pointers. However for home recording it is required that a recording is made in one pass, i.e. the video is to be recorded directly at its final location without a large buffer. So the device has a small buffer (30), and a processing unit (20,28) for determining pointers to nearby units based on the buffer contents, while values for pointers pointing far forward are set arbitrarily, based on nearby units and/or default values indicating that the unit intended to be pointed to does not exist.Type: ApplicationFiled: October 11, 2002Publication date: March 6, 2003Inventors: Patricia E. M. Wilson, Robert A. Brondijk