1
David John DiGiovanni, Yoshihiro Emori, Michael Fishteyn, Clifford Headley: Optical fiber configuration for dissipating stray light. DFS Fitel, July 20, 2010: US07760978 (131 worldwide citation)

An optical transmission fiber is formed to include a relatively low-index, relatively thin outer cladding layer disposed underneath the protective polymer outer coating. Stray light propagating along an inner cladding layer(s) within the fiber will be refracted into the thin outer cladding (by prope ...


2
Youichi Akasaka, Yoshihiro Emori, Shu Namiki: Raman amplifier, optical repeater, and raman amplification method. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, September 18, 2001: US06292288 (71 worldwide citation)

A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent central waveleng ...


3
Benjamin J Eggleton, Paul Steinvurzel, Yoshihiro Emori, Shu Namiki, Akira Fujisaki, Toshio Kimura: TUNABLE MULTIMODE LASER DIODE MODULE, TUNABLE MULTIMODE WAVELENGTH DIVISION MULTIPLEX RAMAN PUMP, AND AMPLIFIER, AND A SYSTEM, METHOD, AND COMPUTER PROGRAM PRODUCT FOR CONTROLLING TUNABLE MULTIMODE LASER DIODES, RAMAN PUMPS, AND RAMAN AMPLIFIERS. Fitel USA, July 27, 2004: US06768577 (25 worldwide citation)

A tunable multimode wavelength division multiplex Raman pump and amplifier, and a system, method, and computer program product for controlling a tunable Raman pump and amplifier. The tunability of the pump source is accomplished by either straining or heating an external fiber grating, thereby causi ...


4
David John DiGiovanni, Yoshihiro Emori, Michael Fishteyn, Clifford Headley: Optical fiber configuration for dissipating stray light. Furukawa Electric North America, Wendy W Koba, October 14, 2008: US07437046 (24 worldwide citation)

An optical transmission fiber is formed to include a relatively low-index, relatively thin outer cladding layer disposed underneath the protective polymer outer coating. Stray light propagating along an inner cladding layer(s) within the fiber will be refracted into the thin outer cladding (by prope ...


5
Shu Namiki, Yoshihiro Emori, Mikio Ogai: Raman amplifier system, apparatus and method for identifying, obtaining and maintaining an arbitrary Raman amplification performance. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, August 26, 2003: US06611370 (21 worldwide citation)

A Raman amplifier, system and method using a plurality of pumps configured to pump light into an optical fiber so as to Raman-amplify an optical signal propagating through the optical fiber. The Raman amplifier also includes an optical coupler configured to optically interconnect the pumping device ...


6
Atsushi Ogino, Masaru Fukushima, Yoshihiro Emori, Haruki Ogoshi, Yoshio Tashiro: Optical amplifier. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, June 25, 2002: US06411430 (19 worldwide citation)

In an optical amplifier having a plurality of rare earth doped optical fibers in a multi-stage, there are provided one or more optical variable attenuator means, and an attenuation amount control means for changing an optical attenuation amount of the optical variable attenuator means on the basis o ...


7
Yuki Taniguchi, Yoshihiro Emori, Ryuichi Sugizaki, Atsushi Oguri, Takeshi Yagi: Optical fiber for Raman amplification, optical fiber coil, Raman amplifier, and optical communication system. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, October 21, 2008: US07440167 (17 worldwide citation)

An optical fiber for Raman amplification amplifies a signal light with a pumping light. A chromatic dispersion at a wavelength of 1,550 nm is in a range between −70 ps/nm/km and −30 ps/nm/km. Raman gain efficiency with a pumping light of 1,450 nm is equal to or more than 5 (W×km)−1. Nonlinear coeffi ...


8
Shunichi Matsushita, Shu Namiki, Yoshihiro Emori: Depolarized laser diode module and depolarized laser diode light source. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, July 4, 2006: US07072369 (17 worldwide citation)

The present invention provides the following designing method: in a laser diode module or a depolarized laser diode module which has one laser diode and one polarization maintaining fiber connected to the output side thereof, the length of the polarization maintaining fiber is a value obtained by ca ...


9
Shunichi Matsushita, Yoshihiro Emori, Shu Namiki: Pump light source device for optical Raman amplification and optical Raman amplification system using the same. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, December 20, 2005: US06977769 (14 worldwide citation)

Disclosed are: a pump light source device for Raman amplification for outputting a pump light for causing signal lightwaves introduced into an optical fiber to undergo Raman amplification therein, the device including two light sources, a polarization beam combiner or a polarization-maintaining opti ...


10
Youichi Akasaka, Yoshihiro Emori, Shu Namiki: Raman amplifier, optical repeater, and raman amplification method. The Furukawa Electric, Oblon Spivak McClelland Maier & Neustadt P C, August 10, 2004: US06775057 (14 worldwide citation)

A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent central waveleng ...