Pumping Patents (Class 359/341.3)
  • Patent number: 10313022
    Abstract: Aspects are generally directed to receivers and methods for actively demodulating optical signals. In one example, a receiver includes an optical resonator to receive an optical signal, the optical resonator including an active optical medium interposed between first and second semi-reflective surfaces, where the active optical medium is configured to accumulate resonant optical signal energy inside the optical resonator based on the received optical signal, the second semi-reflective surface is positioned to emit output optical signal energy, and the optical resonator is configured to disturb the output optical signal energy in response to a variation in the received optical signal. The receiver may further include a detector configured to detect the disturbance in the output optical signal energy, and a pump source coupled to the active optical medium to excite the active optical medium to generate an optical gain in the received optical signal.
    Type: Grant
    Filed: September 27, 2017
    Date of Patent: June 4, 2019
    Assignee: RAYTHEON COMPANY
    Inventors: Benjamin P. Dolgin, Gary M. Graceffo, Andrew Kowalevicz
  • Patent number: 10236924
    Abstract: Embodiments of the disclosure relate to reducing out-of-channel noise in a wireless distribution system (WDS). A digital filter in a remote unit is configured to suppress out-of-channel noise in a downlink digital communications signal based on at least one filter configuration parameter received from a control circuit. The control circuit is configured to determine the filter configuration parameter based on physical characteristics of the downlink digital communications signal. By suppressing the out-of-channel noise of the downlink digital communications signal, it is possible to provide a downlink RF communications signal communicated from the remote unit that complies with a spectrum emission mask (SEM).
    Type: Grant
    Filed: March 31, 2016
    Date of Patent: March 19, 2019
    Assignee: Corning Optical Communications Wireless Ltd
    Inventors: Liav Moshe Daniel, Roi Yosy Ziv
  • Patent number: 10211591
    Abstract: In an example, a tandem pumped fiber amplifier may include a seed laser, one or more diode pumps, and a plural core fiber including a first core and a second core, the second core surrounding the first core. The plural core fiber may include a first section to operate as an oscillator and a second different section to operate as a power amplifier. The one or more diode pumps may be optically coupled to the first section of the plural core fiber, and the seed laser may be optically coupled to the first core.
    Type: Grant
    Filed: October 12, 2017
    Date of Patent: February 19, 2019
    Assignee: NLIGHT, INC.
    Inventor: Manoj Kanskar
  • Patent number: 10177522
    Abstract: Disclosed is a method of Controlling a gain of an optical amplifier comprising a gain medium and at least one pumping device. The method comprises the following steps: determining or predicting a change of input signal power to the amplifier, changing the pump power from an initial pump power level to a new pump power level at a first time instant, the initial pump power level being the pump power level applied to the amplifier prior to the change in input signal power, setting the pump power to a second pump power level at a second time instant, wherein the pump power level is varied in an oscillatory manner for at least one period of time starting at a third time instant and ending at a fourth time instant, wherein said third time instant is identical with or later than said first time instant and said fourth time instant is identical with or earlier than said second time instant.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: January 8, 2019
    Assignee: Xieon Networks S.à.r.l.
    Inventor: Lutz Rapp
  • Patent number: 10156675
    Abstract: A fiber optic modulator of pump energy comprising a piece of double clad fiber where the inner cladding layer has a changing cross sectional shape and may have a changing cross sectional area along the length of the fiber. The modulator fiber regulates how pump energy in the inner cladding layer is absorbed into the core of the fiber along the length of the fiber. This regulates how heat is generated in the fiber due to absorption into core.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: December 18, 2018
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventor: Benjamin R Johnson
  • Patent number: 10135221
    Abstract: Optical amplifier assembly for spatial division multiplexing (SDM) optical communication systems. Each optical amplifier assembly includes a single pump assembly configured for causing amplification of signals traveling on separate fiber paths in different directions. Each fiber path includes a plurality of spatial dimensions. The single pump assembly includes a plurality of pump sources to provide redundancy and the optical amplifier assembly further includes splitters for splitting outputs of the pump sources to amplifiers coupled to the different spatial dimensions. Different modulation formats may be used on the different spatial dimensions with different pump power being provided to each of the modulation formats. Amplifiers with complementary outputs may be coupled to average out gain deviations.
    Type: Grant
    Filed: September 6, 2016
    Date of Patent: November 20, 2018
    Assignee: TYCO ELECTRONICS SUBSEA COMMUNICATIONS LLC
    Inventors: Yu Sun, Oleg Sinkin, Maxim A. Bolshtyansky, Alexei N. Pilipetskii, Dmitri Foursa
  • Patent number: 10128943
    Abstract: A system for predictive maintenance of at least one optical network element in an optical transport network including a power monitor in communication with the at least one optical network element, the power monitor configured to selectively retrieve an actual power level from the optical network element; the power monitor being in communication with a data store having a specified power level for each of the at least one optical network element and an acceptable tolerance, wherein the specified power level includes a low mark and a high mark defining a specified power level range; wherein the power monitor compares the actual power level to the specified power level; and generates a signal if the actual power level is outside of the specified power level range by an amount greater than the acceptable tolerance.
    Type: Grant
    Filed: April 6, 2017
    Date of Patent: November 13, 2018
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Mohammad Abidi
  • Patent number: 9966722
    Abstract: An internally switched fiber laser amplifier is disclosed and claimed. The switch is integrated directly into the fiber amplifier, so that the output power from each fiber amplifier can be switched between N selectable output fibers with minimal (approx. 1%) loss. The switch may be a close coupled pump switch, a spherical mirror or a planar mirror. The fiber laser amplifier may switch both pump and source lights, or may switch only the pump light then combine it with the source light before sending it to a gain amplifier.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: May 8, 2018
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Gregory D. Goodno, James G. Ho
  • Patent number: 9917411
    Abstract: An exemplary embodiment of the disclosure provides a double fiber optic mode adapter including: a fiber core having a variable core diameter; a fiber cladding having a variable cladding size; a first input interface corresponding to a first core diameter and a first cladding size; a second input interface corresponding to a second core diameter and a second cladding size; a thermally-tapered region wherein the variable core diameter of the fiber core transitions from the first core diameter to the second core diameter and the variable cladding size of the fiber cladding transitions from the first cladding size to a third cladding size; and an etched tapered region wherein the variable core diameter of the fiber core is constant and the variable cladding size of the fiber cladding transitions from the third cladding size to the second cladding size.
    Type: Grant
    Filed: June 24, 2016
    Date of Patent: March 13, 2018
    Assignee: OPTICAL ENGINES, INC.
    Inventors: Jason D. Tafoya, Daniel Scott Schulz, Donald L. Sipes, Jr.
  • Patent number: 9806492
    Abstract: The present disclosure provides an optical amplifier using an optical fiber. The optical fiber includes a single-mode optical fiber in which a plurality of rare earth elements is doped simultaneously; first and second optical fiber gratings disposed at opposite sides of the optical fiber, respectively, and totally reflecting light having a wavelength in a specific range; a pumping light source configured to generate a pumping light to excite rare earth ions in the optical fiber; and an optical coupler connected to the optical fiber and configured to transmit a light signal generated from a light source and the pumping light generated from the pumping light source to the optical fiber. Therefore, it is possible to obtain efficient amplification of a light signal through a simple configuration using the rare earth elements-doped optical fiber.
    Type: Grant
    Filed: May 30, 2014
    Date of Patent: October 31, 2017
    Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventor: Woo Jin Shin
  • Patent number: 9806495
    Abstract: An optical module includes: a bench part including a bench having a principal surface including first and second areas arranged in a direction of a first axis, a semiconductor optical device disposed on the first area, and a lens disposed on the first area; and a cap including a base made of silicon, the cap being disposed on the bench part. The cap has a cavity containing the semiconductor optical device and the lens, and includes a ceiling extending along a first reference plane, a front wall extending from the ceiling along a second reference plane, and a rear wall extending from the ceiling in a direction from the cap to the bench. The semiconductor optical device, the lens and the cap are arranged along an optical reference plane. The second reference plane is inclined with respect to the first reference plane.
    Type: Grant
    Filed: June 21, 2016
    Date of Patent: October 31, 2017
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Akira Furuya
  • Patent number: 9780520
    Abstract: Ultrashort pulse fiber amplifier having a pulse width from 200 ps to 200 fs comprising a rare earth oxide doped multicomponent glass fibers for laser amplification, including a core and a cladding, the core comprising at least 2 weight percent glass network modifier selected from BaO, CaO, MgO, ZnO, PbO, K2O, Na2O, Li2O, Y2O3, or combinations; wherein the mode of the core is guided with step index difference between the core and the cladding, a numerical aperture of the fiber is between 0.01 and 0.04; core diameter is from 25 to 120 micron, and a length of the gain fiber is shorter than 60 cm.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: October 3, 2017
    Assignee: ADVALUE PHOTONICS, INC.
    Inventors: Shibin Jiang, Tao Luo, Qing Wang, Lei Pan
  • Patent number: 9683830
    Abstract: A fiber light source comprises a laser pump configured to generate a pump laser beam at a predetermined wavelength; a first segment of rare earth doped fiber; a second segment of rare earth doped fiber; and an optical coupler coupled to a first end of the first segment and a first end of the second segment. The optical coupler is configured to split the pump laser beam based on a power coupling ratio. The first segment generates a first stimulated emission having a first mean wavelength sensitivity to pump laser power fluctuations and the second segment generates a second stimulated emission having a second mean wavelength sensitivity to pump laser power fluctuations such that a combined stimulated emission is approximately insensitive to pump laser power fluctuations.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: June 20, 2017
    Assignee: Honeywell International Inc
    Inventors: Tiequn Qiu, Steven J. Sanders
  • Patent number: 9645310
    Abstract: The invention is an active double-clad fiber comprising the following four layers: a high refractive index small diameter core; an inner annular clad layer doped with active ions surrounding the core; an outer annular clad layer surrounding the inner clad layer; and an annular low refractive index outer coating layer surrounding the outer clad layer. The structure of the fiber of the invention and the properties of the materials of its layers provides high discrimination against higher modes, thereby maintaining single mode operation in laser systems. The diameter of the core of the fiber of the invention is much smaller than the diameter of the large single transverse mode that it guides, thereby allowing guiding and amplification to take place mainly in the inner doped clad layer.
    Type: Grant
    Filed: July 23, 2014
    Date of Patent: May 9, 2017
    Assignee: B.G. Negev Technologies and Applications Ltd.
    Inventors: Amiel Ishaaya, Eitan Ronen
  • Patent number: 9638725
    Abstract: An optical receiver includes a light reception element for receiving an optical signal, a bias voltage supply/monitoring circuit for supplying a bias voltage to the light reception element and generating a monitoring voltage indicating magnitude of an output current of the light reception element, and a constant current source. The bias voltage supply/monitoring circuit is supplied with a remaining current obtained by subtracting the output current of the light reception element from an output current of the constant current source. The bias voltage supply/monitoring circuit converts the remaining current to the monitoring voltage.
    Type: Grant
    Filed: July 4, 2013
    Date of Patent: May 2, 2017
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Naruto Tanaka
  • Patent number: 9625653
    Abstract: A universal fiber optic connector includes a housing and a fiber attachment element configured to attach an optical fiber in the housing. The attachment element positions the optical fiber such that an end face of the fiber is held within the housing. The fiber end face is positioned such that a beam of light emerging from the fiber end face has a defined wavefront located at a specified interface.
    Type: Grant
    Filed: July 15, 2016
    Date of Patent: April 18, 2017
    Assignee: IPG PHOTONICS CORPORATION
    Inventors: Mark W. Byer, Manuel J. Leonardo, Gregory L. Keaton
  • Patent number: 9544087
    Abstract: An amplifying device includes a light source configured to output excitation light, a depolarizer configured to change a degree of polarization of the excitation light in accordance with a setting, an amplifier configured to execute Raman amplification so as to amplify a polarized multiplexed optical signal by the excitation light of which the degree of the polarization has been changed by the depolarizer, a measurer configured to measure the power of a plurality of polarized light components multiplexed into the polarized multiplexed optical signal subjected to the Raman amplification and amplified by the excitation light, and an adjuster configured to calculate differences between the power of the plurality of polarized light components and adjust the setting of the depolarizer so as to reduce the differences between the power of the plurality of polarized light components.
    Type: Grant
    Filed: May 26, 2015
    Date of Patent: January 10, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Yoshihisa Kondo, Toshihiro Ohtani
  • Patent number: 9515732
    Abstract: A spacecraft or satellite optical transmission apparatus (10) including an optical fiber (11) and at least one optical pump source (14) operatively coupled to provide pump energy to the optical fiber (11), the optical fiber (11) comprising an active trivalent dopant such as erbium and at least one passive trivalent dopant such as lanthanum. A method for transmitting electromagnetic radiation in a high radiation environment is also disclosed.
    Type: Grant
    Filed: December 9, 2014
    Date of Patent: December 6, 2016
    Assignee: Fibercore Limited
    Inventors: Mark David Hill, Judith Hankey
  • Patent number: 9466939
    Abstract: A method of operating a Tm:doped fiber amplifier including selecting a length of Tm:doped optical fiber to be less than one hundred meters, doping the optical fiber with active ions at a doping level of greater than one percent, optically pumping the doped optical fiber with a first laser beam having a wavelength longer than the wavelength where a maximum absorption cross section is provided by the active ions, and creating a population inversion between two active ion energy levels with the first laser beam, the active ions providing a gain to a second laser beam.
    Type: Grant
    Filed: September 2, 2015
    Date of Patent: October 11, 2016
    Assignee: Physical Sciences, Inc.
    Inventors: Peter F. Moulton, Robert Stegeman
  • Patent number: 9461436
    Abstract: The present invention relates to a pulse laser device, and more particularly, to a pulse laser device which can be operated in a burst mode, in which the output of a low-output laser generator is adjusted so as to enable the uniform control of the profile of the peak output of a final output optical pulse train, and in a variable burst mode, in which the profile of the final output optical pulse train can be controlled into an arbitrary waveform.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: October 4, 2016
    Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
    Inventors: Young-Chul Noh, Woojin Shin, Bong-Ahn Yu, Yeung Lak Lee, Changsoo Jung
  • Patent number: 9395496
    Abstract: A universal fiber optic connector includes a housing and a fiber attachment element configured to attach an optical fiber in the housing. The attachment element positions the optical fiber such that an end face of the fiber is held within the housing. The fiber end face is positioned such that a beam of light emerging from the fiber end face has a defined wavefront located at a specified interface.
    Type: Grant
    Filed: September 10, 2015
    Date of Patent: July 19, 2016
    Assignee: IPG Photonics Corporation
    Inventors: Mark W. Byer, Manuel J. Leonardo, Gregory L. Keaton
  • Patent number: 9229157
    Abstract: A solid photonic band gap fiber includes: a core area located at a central portion of a cross-section with respect to a longitudinal direction of the fiber, the core area being formed of a solid substance having a low refractive index; cladding areas having base portions formed of a solid substance having a low refractive index, the cladding areas surrounding the core area; and a plurality of fine high refractive index scatterers provided in the cladding areas, and disposed in a dispersed manner so as to surround the core area, the number of fine high refractive index scatterers being formed of a solid substance having a high refractive index, wherein in a state that the solid photonic band gap fiber is held at a predetermined bending radius, propagation in a high-order mode is suppressed by using a difference in a bending loss between a fundamental mode and the high-order mode, and only the fundamental mode is substantially propagated, the fundamental mode and the high-order mode being caused by bending.
    Type: Grant
    Filed: March 27, 2013
    Date of Patent: January 5, 2016
    Assignees: FUJIKURA LTD., National University Corporation Hokkaido University
    Inventors: Shoji Tanigawa, Katsuhiro Takenaga, Masahiro Kashiwagi, Kunimasa Saitoh
  • Patent number: 9219345
    Abstract: An optical amplification control apparatus is provided with: a first branch unit for branching an optical signal to which an additional optical signal with a predetermined wavelength has been added in a self node or a nearest node; a first filter unit for extracting the additional optical signal from one optical signal into which the first branch unit has branched; an amplification unit for amplifying the other optical signal into which the first branch unit has branched; a second branch unit for branching the optical signal amplified by the amplification unit; a second filter unit for extracting the additional optical signal from one optical signal into which the second branch unit has branched; and a first control unit for performing automatic gain control of the amplification unit based on the additional optical signal extracted by the first filter unit, and the additional optical signal extracted by the second filter unit.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: December 22, 2015
    Assignee: NEC CORPORATION
    Inventor: Yurie Takahashi
  • Patent number: 9203207
    Abstract: A method for filtering noises in an optical parametric chirped-pulse amplifier by a spatial-chirp-dressed seed beam is provided. The various noises that grow during amplification course, including parametric super-fluorescence, pump distortion-induced noise and surface-reflection-initiated pre-pulses, will not have the spatial and temporal chirp. After dechirping amplified signal with a compressor, a main pulse having its spatial and temporal chirp removed completely is produced, while the noises acquire an additional spatiotemporal coupling, making themselves highly distinguishable from signal in space, and hence supporting noise filtering effectively and expediently in spatial domain that would not be possible otherwise. The method has capabilities of an order of magnitude reduction in noise energy and several orders of magnitude enhancement in temporal contrast.
    Type: Grant
    Filed: September 2, 2014
    Date of Patent: December 1, 2015
    Assignee: SHANGHAI JIAO TONG UNIVERSITY
    Inventors: Liejia Qian, Jing Wang, Peng Yuan, Jingui Ma, Yongzhi Wang, Guoqiang Xie
  • Patent number: 9130340
    Abstract: The system contains an input fiber section coupled in optical communication with an optical input signal. A length of doped optical gain fiber is optically coupled with the input fiber section. A pumping mechanism is coupled to the doped optical gain fiber. An output port is formed at a distal end of the doped optical gain fiber, wherein the output port is approximately less than twenty centimeters long.
    Type: Grant
    Filed: March 1, 2010
    Date of Patent: September 8, 2015
    Assignee: POLAR LASER LABORATORIES, LLC
    Inventors: Pavel Polynkin, Alexander Tselikov
  • Patent number: 9113540
    Abstract: A system includes a chamber, a laser beam apparatus configured to generate a laser beam to be introduced into the chamber, a laser controller for the laser beam apparatus to control at least a beam intensity and an output timing of the laser beam, and a target supply unit configured to supply a target material into the chamber, the target material being irradiated with the laser beam for generating extreme ultraviolet light.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: August 18, 2015
    Assignee: Gigaphoton Inc.
    Inventors: Tsukasa Hori, Kouji Kakizaki, Tatsuya Yanagida, Osamu Wakabayashi
  • Patent number: 9077143
    Abstract: An optical fiber apparatus is suitable to operate under irradiation, more particularly to mitigating the damage of a rare-earth-doped optical fiber element as part of an optical fiber assembly causes by irradiation. The irradiation mitigation attributes to a photo-annealing apparatus including at least a shorter wavelength photo-annealing spectral content, which is relative to that of a pump light source, for effectively photo-annealing the rare-earth-doped fiber element. Photo-annealing by such shorter wavelength light results in a fast and nearly complete recovery of radiation induced attenuation of the rare-earth-doped optical fiber element in the wavelength range from 900 nm to 1700 nm.
    Type: Grant
    Filed: July 9, 2013
    Date of Patent: July 7, 2015
    Assignee: NATIONAL APPLIED RESEARCH LABORATORIES
    Inventors: Tz-Shiuan Peng, Ren-Young Liu, Lon Wang
  • Publication number: 20150138630
    Abstract: Apparatus and method for suppressing modal instabilities (MI) in fiber-amplifier systems. In some embodiments, thermal effects drive the MI process, and in some such embodiments, the present invention provides a plurality of options for mitigating these thermal effects. In some embodiments, the present invention provides a hybrid fiber with a smaller core in the initial length where the thermal loads are highest, followed by a larger-core fiber. In some embodiments the length of the smaller-core section is chosen to keep the core heat-per-unit-length of the second section below a critical value for the onset of MI. In some embodiments, the hybrid fiber of the present invention avoids modal instabilities while yielding almost the same performance as compared to conventional fibers with regard to minimizing fiber nonlinearities such as Stimulated Brillouin Scattering (SBS). In some embodiments, the hybrid fiber outputs a signal beam with at least 1 kW of power.
    Type: Application
    Filed: November 21, 2013
    Publication date: May 21, 2015
    Inventors: Eric C. Honea, Matthias P. Savage-Leuchs, Sean M. Courtney, Khushvinder S. Brar, Jason D. Henrie, Christian D. Dilley
  • Patent number: 9036252
    Abstract: A fiber amplifier system including at least one seed source providing an optical seed beam and a harmonic driver providing a sinusoidal drive signal at a predetermined frequency. The system also includes a harmonic phase modulator that receives the seed beam and the drive signal, where the harmonic phase modulator frequency modulates the seed beam using the drive signal so as to remove optical power from a zeroth-order frequency of the seed beam and create sidebands separated by the frequency of the drive signal. A dispersion element receives the frequency modulated seed beam and provides temporal amplitude modulation to the seed beam and a nonlinear fiber amplifier receives the amplitude modulated seed beam from the dispersion element and amplifies the seed beam, where the dispersion element and the fiber amplifier combine to remove optical power from the sidebands and put optical power back into the zeroth-order frequency.
    Type: Grant
    Filed: September 11, 2014
    Date of Patent: May 19, 2015
    Assignee: NORTHROP GRUMMAN SYSTEMS CORPORATION
    Inventors: Gregory D. Goodno, Peter A. Thielen, Joshua E. Rothenberg
  • Patent number: 9030730
    Abstract: A method for amplifying optical signals includes determining a source optical signal, generating a first resultant signal including a pump signal and the source optical signal, sending the first resultant signal through a non-linear element to generate a second resultant signal including the first resultant signal and an idler signal, and sending the second resultant signal through a non-linear element to perform phase-sensitive amplification. The phase-sensitive amplification results in a third resultant signal including an amplified source optical signal, the pump signal, and the idler signal. The method also includes filtering the third resultant signal to remove the pump signal and the idler signal and outputting the amplified source optical signal.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: May 12, 2015
    Assignee: Fujitsu Limited
    Inventors: Jeng-Yuan Yang, Motoyoshi Sekiya, Yoichi Akasaka
  • Patent number: 9007679
    Abstract: Methods and apparatus for the active control of a wavelength-swept light source used to interrogate optical elements having characteristic wavelengths distributed across a wavelength range are provided.
    Type: Grant
    Filed: February 7, 2013
    Date of Patent: April 14, 2015
    Assignee: Weatherford/Lamb, Inc.
    Inventor: Domino Taverner
  • Patent number: 9007682
    Abstract: A controller is configured to determine a first amount of current associated with a first power level. The controller is configured further to generate a digital pulse signal based on the first amount of current, where the digital pulse signal may have a second power level and an associated duty cycle. The controller is configured further to convert the digital pulse signal into a second amount of current and output the second amount of current as a pulse signal based on the duty cycle.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: April 14, 2015
    Assignee: Infinera Corporation
    Inventors: Brian Shia, Yan Han
  • Patent number: 9001414
    Abstract: The invention relates to a high power amplifier waveguide for amplifying an optical signal wherein photo darkening due to high optical flux is reduced considerably. This is achieved by providing a cladding pumped amplifier waveguide wherein the optical mode overlap to the active material of the waveguide is low and/or wherein the active material is distributed over a large cross sectional region of the waveguide.
    Type: Grant
    Filed: November 30, 2009
    Date of Patent: April 7, 2015
    Assignee: NKT Photonics A/S
    Inventors: Kent Mattsson, Kim Per Hansen
  • Patent number: 8995052
    Abstract: A solid-state MOPA includes a mode-locked laser delivering a train of pulses. The pulses are input to a fast E-O shutter, including polarization-rotating elements, polarizing beam-splitters, and a Pockels cell that can be driven alternatively by high voltage (HV) pulses of fixed long and short durations. A multi-pass amplifier follows the E-O shutter. The E-O shutter selects every Nth pulse from the input train and delivers the selected pulses to the multi-pass amplifier. The multi-pass amplifier returns amplified seed-pulses to the E-O shutter. The shutter rejects or transmits the amplified pulses depending on whether the HV-pulse duration is respectively short or long. Transmitted amplified pulses are delivered to a transient amplifier configured for separately suppressing first-pulse over-amplification and residual pulse leakage.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: March 31, 2015
    Assignee: Coherent Kaiserslautern GmbH
    Inventors: Ralf Knappe, Albert Seifert, Alexander Weis
  • Publication number: 20150085351
    Abstract: An optical amplifier includes a multi-mode pump laser module, a multi-mode waveguide, a multi-mode to multiple single-mode fiber converter module and a plurality of single-mode cores. The multi-mode pump laser module emits pump light having a plurality of modes to the multi-mode fiber or waveguide. The multi-mode waveguide propagates the emitted pump light to the converter module. The converter module receives the pump light and distributes the pump light approximately uniformly to a plurality of single-mode cores.
    Type: Application
    Filed: December 31, 2013
    Publication date: March 26, 2015
    Inventors: Nicolas K. Fontaine, Roland Ryf, David Neilson
  • Patent number: 8979396
    Abstract: A side pump fiber and a method of making a side pump fiber are provided. A plurality of pump fibers can be joined to a side of a signal fiber, at different locations. The method includes creating a lengthwise, tapered, concave pocket cut in a pump (or side pump) fiber, inserting the signal fiber in the pocket cut, and then coupling the side pump fiber to the center fiber at the pocket cut. Optical amplifiers and lasers, as examples, can be made using the above method and side pump fibers.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: March 17, 2015
    Assignee: 3SAE Technologies, Inc.
    Inventor: Robert G. Wiley
  • Patent number: 8970946
    Abstract: An optical signal processing apparatus includes an input unit to which signal light is input; a wave coupling unit that couples the signal light from the input unit and pump light having a waveform different from that of the signal light; a first nonlinear optical medium that transmits light coupled by the wave coupling unit, the light being the signal light and the pump light; a dispersion medium that transmits the light that has been transmitted through the first nonlinear optical medium; and a second nonlinear optical medium that transmits the light that has been transmitted through the dispersion medium.
    Type: Grant
    Filed: June 30, 2011
    Date of Patent: March 3, 2015
    Assignee: Fujitsu Limited
    Inventor: Shigeki Watanabe
  • Publication number: 20150055210
    Abstract: An ultra-high power fiber laser system includes a single-piece fiber booster configured with fiber and straight short rod fiber portions which have in common a core configured with a numerical aperture equal to or higher than 0.1 and doped with ions of one or more rare earth elements across the entire cross-section thereof. The rod fiber portion is structured with a short length not exceeding about a few tens of centimeters and has a generally frustoconical cross-section expanding from the uniformly configured fiber portion. The core extending along the fiber portion is capable of supporting either a SM or a very low number of HOMs guided along the core in a propagating direction and coupled into the small diameter end of the rod fiber's frustoconically-shaped core. The opposite, large-diameter end of the frustoconical core supports multiple modes with a fundamental mode overlapping at least about 0.652 of the cross-section area of the core along the entire length thereof.
    Type: Application
    Filed: August 20, 2014
    Publication date: February 26, 2015
    Inventors: Valentin Gapontsev, Igor Samartsev
  • Publication number: 20150036210
    Abstract: The phase sensitive amplifier according to the present invention is a phase sensitive amplifier that uses the optical mixing using a nonlinear optical effect to amplify the signal light. The phase sensitive amplifier according to the present invention includes: the first second-order nonlinear optical element; and the second second-order nonlinear optical element. The first second-order nonlinear optical element causes the fundamental wave light to generate second harmonic light used as pump light and separates only the second harmonic light. The second second-order nonlinear optical element includes a multiplexer to multiplex the signal light with the second harmonic light and spectrally separates only the amplified signal light. The multiplexed signal light and second harmonic light are used subjected to parametric amplification.
    Type: Application
    Filed: January 20, 2012
    Publication date: February 5, 2015
    Inventors: Masaki Asobe, Takeshi Umeki, Kouji Enbutsu, Akio Tokura, Yutaka Miyamoto, Hidehiko Takara, Hirokazu Takenouchi, Isao Tomita
  • Publication number: 20150036703
    Abstract: Various embodiments include large cores fibers that can propagate few modes or a single mode while introducing loss to higher order modes. Some of these fibers are holey fibers that comprise cladding features such as air-holes. Additional embodiments described herein include holey rods. The rods and fibers may be used in many optical systems including optical amplification systems, lasers, short pulse generators, Q-switched lasers, etc. and may be used for example for micromachining.
    Type: Application
    Filed: October 21, 2014
    Publication date: February 5, 2015
    Inventors: Liang Dong, William Wong, Martin E. Fermann
  • Patent number: 8947767
    Abstract: An excitation light source, for Raman amplification, includes a polarization beam splitter (PBS) for splitting a laser beam from an excitation laser into two polarization components, and a polarization beam combiner (PBC) for combining the two polarization components, and a time difference generator provided between PBS and PBC. The time difference generator generates a difference in propagation time between the two polarization components.
    Type: Grant
    Filed: December 26, 2012
    Date of Patent: February 3, 2015
    Assignees: Fujitsu Telecom Networks Limited, Fujitsu Limited
    Inventors: Shota Mori, Norifumi Shukunami, Takeshi Hoshida
  • Patent number: 8938165
    Abstract: An optical transmission device according to the present invention comprises: a Raman amplification means; a main signal light sending means which sends first main signal light; a communication interruption detection light monitoring means which sends a first signal if it cannot detect communication interruption detection light; a main signal light monitoring means which sends a second signal if it cannot detect second main signal light; a light monitoring signal analysis means which sends a result of its analysis of a light monitoring signal as a third signal in a predetermined period of time; and a control means which makes the Raman amplification means suspend the generation of the excitation light, if it cannot receive the third signal even after the elapse of the predetermined period of time in the state it has received the first signal and has not received the second signal, and stops sending of the first main signal light from the main signal light sending means when receiving the second signal further.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: January 20, 2015
    Assignee: NEC Corporation
    Inventor: Noboru Iijima
  • Publication number: 20150015938
    Abstract: A fiber optic parametric amplifier that includes a resonating cavity. The resonating cavity includes linear fiber optic gain medium, with negative chromatic dispersion; and a nonlinear fiber optic gain medium with positive chromatic dispersion.
    Type: Application
    Filed: June 23, 2014
    Publication date: January 15, 2015
    Inventors: Khanh KIEU, Thanh Nam NGUYEN, Nasser PEYGHAMBARIAN, Takefumi OTA
  • Patent number: 8934167
    Abstract: An optical fiber coupler in which damage to a pumping light source can be suppressed even if signal light leaks and an optical fiber amplifier using the optical fiber coupler are provided. An optical fiber coupler includes: a first optical fiber having a core and a clad coating the core; a second optical fiber having a core; and a fusion-drawn portion formed by arranging the first optical fiber and the second optical fiber so that their longitudinal directions are in the same direction and fusing the clad of the first optical fiber and the core of the second optical fiber. The clad of the first optical fiber has a larger refractive index than the core of the second optical fiber.
    Type: Grant
    Filed: May 25, 2010
    Date of Patent: January 13, 2015
    Assignee: Fujikura Ltd.
    Inventor: Minoru Takahashi
  • Patent number: 8928971
    Abstract: A high-power optical fiber laser includes: an oscillator (1); a pumping laser (5) able to emit a high-power pumping optical radiation beam; and a signal-amplifying optical fiber (3) able to receive the optical source signal and the high-power pumping optical radiation beam so as to generate a high-power laser beam. The pumping laser includes a plurality of pumping multimode laser diodes (7a-7f) and a laser cavity, the laser cavity including a double-clad fiber (4) including: a neodymium-doped monomode waveguide; a fiber Bragg grating (9) forming one end of the laser cavity; and a fiber reflector (11) forming the other end of the laser cavity, the monomodefiber laser being able to generate a laser radiation beam when it is optically pumped by a pumping radiation beam originating from the plurality of pumping laser diodes in order for the laser cavity to emit a high-power pumping laser radiation beam.
    Type: Grant
    Filed: February 14, 2012
    Date of Patent: January 6, 2015
    Assignees: IXFIBER, Centre National de la Recherche Scientifique
    Inventors: Mathieu Laroche, Herve Gilles, Sylvain Girard, Thierry Robin, Benoit Cadier
  • Publication number: 20140376084
    Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.
    Type: Application
    Filed: September 10, 2014
    Publication date: December 25, 2014
    Applicant: IMRA AMERICA, INC.
    Inventors: Donald J. HARTER, Gyu C. CHO, Zhenlin LIU, Martin E. FERMANN, Xinhua GU, Salvatore F. NATI, Lawrence SHAH, Ingmar HARTL, Mark BENDETT
  • Publication number: 20140355105
    Abstract: A method for regenerating optical signals includes determining an input including a source amplitude-modulated optical signal, regenerating the source amplitude-modulated optical signal by using successive saturation modes of amplification, and producing an output optical signal from the regeneration. The source amplitude-modulated optical signal includes input power modulation levels that each indicate information carried on the source amplitude-modulated optical signal. The output optical signal includes output power modulation levels that include information equivalent to information of the input power modulation levels.
    Type: Application
    Filed: May 31, 2013
    Publication date: December 4, 2014
    Inventors: Youichi Akasaka, Jeng-Yuan Yang
  • Patent number: 8903249
    Abstract: A method and apparatus for suppressing pump-mode optical beat interference noise in a Raman amplified fiber link of an optical network, wherein a wavelength of a laser beam generated by a first pump laser and a wavelength of a laser beam generated by a second pump laser of a pair of polarization multiplexed pump lasers are detuned with respect to each other to suppress the optical beat interference, OBI, noise in the Raman amplified fiber link of said optical network.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: December 2, 2014
    Assignee: ADVA Optical Networking SE
    Inventor: Dogan Atlas
  • Patent number: 8891932
    Abstract: The invention provides an amplification module for an optical printed circuit board, the optical printed circuit board including plural polymer waveguide sections from independent waveguides, each of the sections being doped with an amplifying dopant, wherein the plural waveguide sections are routed so as to pass through an amplification zone in which the plural polymer waveguide sections are arranged close or adjacent to one another, the amplification module including: a pump source including plural light sources arranged to provide independently controllable levels of pump radiation to each of the plural waveguide sections. In an embodiment, the amplification module also includes plural polymer waveguide sections corresponding to the plural polymer waveguides of the printed circuit board on which in use the amplification module is to be arranged, each of the sections being doped with an amplifying dopant.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 18, 2014
    Assignee: Xyratex Technology Limited
    Inventor: Richard Charles Alexander Pitwon
  • Publication number: 20140333995
    Abstract: Optical pump modules comprising VCSEL and VCSEL array devices provide high optical power for configuring fiber optic gain systems such as fiber laser and fiber amplifier particularly suited for high power operation. Pump modules may be constructed using two reflector or three reflector VCSEL devices optionally integrated with microlens arrays and other optical components, to couple high power pump beams to an optical fiber output port, particularly suited to couple light to an inner cladding of a double-clad fiber suitable for a high power gain element. Multiple-pumps may be combined to increase pump power in a modular fashion without significant distortion to signal, particularly for short pulse operation. The pump modules may be operated in CW, QCW and pulse modes to configure fiber lasers and amplifiers using single end, dual end, and regenerative optical pumping modes.
    Type: Application
    Filed: July 25, 2014
    Publication date: November 13, 2014
    Applicant: PRINCETON OPTRONICS INC.
    Inventors: Jean-Francois Seurin, Qing Wang, Laurence Watkins, Chuni Lal Ghosh