Patent application number | Description | Published |
20080271493 | Method for elongating a glass body - A method of elongating a glass body is provided, in which method the axial variation in the inner refractive index structure of a glass body can be restrained. The method comprises: ( | 11-06-2008 |
20100247093 | CUTOFF WAVELENGTH MEASURING METHOD AND OPTICAL COMMUNICATION SYSTEM - A method includes a first step of joining a multimode fiber to a first end of an optical fiber being a specimen, allowing light to propagate from the multimode fiber to the specimen, measuring an intensity of light from a second end of the specimen, and determining a first power spectrum; a second step of joining the multimode fiber to a first end of a reference fiber having bending loss higher than that of the specimen, allowing light to propagate from the multimode fiber to the reference fiber, measuring an intensity of light from a second end of the reference fiber, and determining a second power spectrum; a third step of determining a difference spectrum by subtracting the second power spectrum from the first power spectrum; and a fourth step of determining a higher-order mode cutoff wavelength of the specimen on the basis of a shape of the difference spectrum. | 09-30-2010 |
20110085768 | OPTICAL FIBER AND METHOD OF MANUFACTURING OPTICAL FIBER - An optical fiber having excellent strength that can be manufactured at low cost, as well as a method for making such optical fiber, is provided. An optical fiber | 04-14-2011 |
20110100428 | PHOTOELECTRIC CONVERSION UNIT - A photoelectric conversion unit in which efficiency of optical coupling and stability of mechanical coupling improve is obtained. | 05-05-2011 |
20120236295 | METHOD OF MEASURING BENDING PERFORMANCE OF OPTICAL FIBER - A method of measuring the bending performance of an optical fiber in a simple manner is provided. Power P | 09-20-2012 |
20120274928 | METHOD OF MEASURING CUTOFF WAVELENGTH - A method for accurately measuring the cutoff wavelength of a high order mode of an optical fiber includes a first step of measuring power spectrum P | 11-01-2012 |
20120312054 | APPARATUS AND METHOD FOR MAKING AN OPTICAL FIBER PREFORM - Apparatus and methods for making an optical fiber preform at low cost avoiding the apparatus from being damaged are provided. Apparatus for making an optical fiber preform by depositing glass particles on the circumferential surface of a glass rod comprises: a chamber, a plasma torch, a glass particle supplying part, a composition modification gas supplying part, and an exhaust part. The chamber surrounds the heating portion of the glass rod heated by the plasma torch. The plasma torch heats the glass particles by a plasma flame. The glass particle supplying part introduces glass particles towards the heating portion of the glass rod in the chamber. The composition modification gas supplying part introduces composition modification gas into the chamber in order to modify the composition of the glass particles to be deposited on the heating portion of the glass rod in the chamber. | 12-13-2012 |
20130064516 | METHOD OF MANUFACTURING OPTICAL FIBER AND OPTICAL FIBER - A method of manufacturing an optical fiber includes a first step of drawing an optical fiber preform into a glass fiber and disposing a fiber coating on the outer circumference of the glass fiber to form a parent optical fiber; a second step of cutting the parent optical fiber into a plurality of individual optical fibers; a third step of determining, at, at least, one spot of the parent optical fiber, a failure strength F1 and a failure time T; a fourth step of determining a failure strength F2 of each of the individual optical fibers; and a fifth step of selecting an optical fiber having a failure strength F2 of 5.5 kgf or more from the individual optical fibers cut from the parent optical fiber whose failure strength F1 and failure time T satisfy the inequality T>2.6×10 | 03-14-2013 |
20130094819 | OPTICAL TRANSMISSION LINE - There is provided an optical transmission line that includes a bend insensitive fiber (BIF) defined by ITU-T Recommendation G.657 and that reduces the influence of MPI. An optical transmission line | 04-18-2013 |
20130094825 | OPTICAL FIBER, OPTICAL FIBER CORD, AND OPTICAL FIBER CABLE - A trench optical fiber that stably realizes a small transmission loss includes (1) a core extending in an axial direction while containing an axial center of the fiber, the core having a diameter d | 04-18-2013 |
20130148934 | OPTICAL FIBER, OPTICAL TRANSMISSION SYSTEM, AND METHOD OF MAKING OPTICAL FIBER - Provided is an inexpensive low-loss optical fiber suitably used in an optical transmission network. An optical fiber includes a core, an optical cladding, and a jacket. The core has a relative refractive index difference between 0.2% and 0.32% and has a refractive index volume between 9%·μm | 06-13-2013 |
20130195411 | MULTI-CORE OPTICAL FIBER - A multi-core optical fiber | 08-01-2013 |
20140056596 | OPTICAL FIBER AND OPTICAL TRANSMISSION SYSTEM - An inexpensive low-attenuation optical fiber | 02-27-2014 |
20140137604 | OPTICAL FIBER AND METHOD OF MANUFACTURING OPTICAL FIBER - An optical fiber having excellent strength that can be manufactured at low cost, as well as a method for making such optical fiber, is provided. An optical fiber | 05-22-2014 |
20150160410 | OPTICAL FIBER - An inexpensive low-attenuation optical fiber 1 suitable for use as an optical transmission line in an optical access network is a silica based glass optical fiber and includes a core | 06-11-2015 |
20150251945 | OPTICAL FIBER FABRICATION METHOD - An optical fiber manufacturing method includes a drawing step and a slow cooling step. In the slow cooling step, an optical fiber passes through a heating furnace having a temperature which is set such that in at least 70% of a region from a first position at which a glass outer diameter of the optical fiber becomes less than 500% of a final outer diameter to a second position at which a temperature T of the optical fiber becomes 1400° C., an actual temperature of the optical fiber is within ±100° C. of a target temperature Tt(n) for each position n. The target temperature Tt(n) is a temperature at which a fictive temperature Tf(n+1) of a core at a position n+1 determined by calculation using the recurrence formula “Tf(n+1)=T(n)+(Tf(n)−T(n))exp(−Δt(T(n)))” starting from a fictive temperature Tf(0) of the optical fiber at the first position n=0 is lowest. | 09-10-2015 |
20150274577 | METHOD FOR MANUFACTURING MULTI-CORE OPTICAL FIBER - A manufacturing method according to an embodiment of the invention includes a step of calculating Pj | 10-01-2015 |
Patent application number | Description | Published |
20100166373 | OPTICAL FIBER AND OPTICAL CABLE - Provided is an optical fiber that has a small bending loss, can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G. 652 standard. An optical fiber | 07-01-2010 |
20110222824 | OPTICAL FIBER AND OPTICAL CABLE - Provided is an optical fiber that has a small bending loss, can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G. 652 standard. An optical fiber | 09-15-2011 |
20120141077 | OPTICAL FIBER AND OPTICAL CABLE - An optical fiber that has a small bending loss can be securely prevented from being fractured due to accidental bending during installation or other operations, and is compliant with the G. 652 standard. The optical fiber includes a core, a first cladding, a second cladding and a third cladding. The relative refractive index difference Δ | 06-07-2012 |
20120237174 | OPTICAL CABLE AND OPTICAL TRANSMISSION SYSTEM - An optical fiber that has a small bending loss can be securely prevented from being fractured due to accidental bending during installation or other operations. The optical fiber includes a core, a first cladding, a second cladding, and a third cladding. The relative refractive index difference Δ | 09-20-2012 |
Patent application number | Description | Published |
20090218014 | Method for Producing Duplex Stainless Steel Seamless Pipe - The present invention is to provide a method for producing duplex stainless steel seamless pipe in which a duplex stainless steel billet can be inhibited from generating an oxide scale on the surface thereof during heating and the generation of outer surface flaw can also be prevented. The billet is heated in the a heating furnace for 1.5 hours or more and 4.0 hours or less at a heating temperature of 1250° C. or more and 1320° C. or less while regulating the average concentration of sulfur dioxide (SO | 09-03-2009 |
20090297717 | Anti-Seizure Agent for Hot Steel Working - An anti-seizure agent for hot steel working that exhibits excellent wettability and surface film-adherability comprises: an inorganic component (first component); sodium hydroxide (second component); water-soluble resins and/or water-soluble surfactants (third component); and water. With the mass of the sum of the first component, the second component, and the third component as 100 mass %, the anti-seizure agent contains: 96.5 mass % or more and 99.98 mass % or less of the first component; 0.01 mass % or more and 2.0 mass % or less of the second component; and 0.01 mass % or more and 1.5 mass % or less of the third component, and the inorganic component is one or more selected from a group consisting of Al | 12-03-2009 |
20120304722 | ANTI-SEIZURE AGENT FOR HOT STEEL WORKING - A method of coating uses an anti-seizure agent for hot steel working that exhibits excellent wettability and surface film-adherability. The agent comprises: an inorganic component (first component); sodium hydroxide (second component); water-soluble resins and/or water-soluble surfactants (third component); and water. With the sum of the first component, the second component, and the third component as 100 mass %, the anti-seizure agent contains: 96.5 mass % or more and 99.98 mass % or less of the first component; 0.01 mass % or more and 2.0 mass % or less of the second component; and 0.01 mass % or more and 1.5 mass % or less of the third component, and the inorganic component is one or more selected from a group consisting of Al | 12-06-2012 |