Filtering (e.g., Noise) Patents (Class 359/337.2)
  • Patent number: 12113572
    Abstract: A method for calculating configuration of an optical transmission network includes: acquiring an initial value of an input power of an optical cable; based on the initial value, obtaining an output power of each channel at an end of a section of the optical cable according to a loss of the optical cable; taking the output power of each channel at the end of the section as a boundary condition to calculate the input power of each channel at the section based on an amount of optical power transferred from a high-frequency channel to a low-frequency channel due to an SRS effect; and calculating a first parameter value of an optical amplifier of the section using the input power of each channel at the section and the output power of each channel at the end of a preceding section of the section.
    Type: Grant
    Filed: December 15, 2022
    Date of Patent: October 8, 2024
    Assignee: Alibaba (China) Co., Ltd.
    Inventors: Liang Dou, Chongjin Xie, Jingchi Cheng, Pak Tao Lau
  • Patent number: 12099235
    Abstract: An amplification fiber includes a core which is doped with an erbium ion and a cladding which surrounds the core and has a refractive index lower than a refractive index of the core, and a relative refractive index difference ?n51 between the core and the cladding is not more than a smaller one of values of a relative refractive index difference ?n1 expressed as a predetermined expression related to a radius a of the core and a relative refractive index difference ?n2 expressed as a predetermined expression related to the radius a of the core.
    Type: Grant
    Filed: January 30, 2020
    Date of Patent: September 24, 2024
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hirotaka Ono, Yutaka Miyamoto
  • Patent number: 11955763
    Abstract: An apparatus may include a diode-pumped solid-state laser oscillator configured to output a pulsed laser beam, a modulator configured to modify an energy and a temporal profile of the pulsed laser beam, and an amplifier configured to amplify an energy of the pulse laser beam. A modified and amplified beam to laser peen a target part may have an energy of about 5 J to about 10 J, an average power (defined as energy (J)×frequency (Hz)) of from about 25 W to about 200 W, with a flattop beam uniformity of less than about 0.2. The diode-pumped solid-state oscillator may be configured to output a beam having both a single longitudinal mode and a single transverse mode, and to produce and output beams at a frequency of about 20 Hz.
    Type: Grant
    Filed: September 21, 2020
    Date of Patent: April 9, 2024
    Assignee: Sunrise International, Inc.
    Inventors: Jeff Dulaney, David W. Sokol, Mark E. O'Loughlin, Keith Glover, Gary May
  • Patent number: 11808997
    Abstract: A device comprises first, second and third elements fabricated on a common substrate. The first element comprises an active waveguide structure comprising electrically pumped optical source supporting a first optical mode. The second element comprises a passive waveguide structure supporting a second optical mode in at least part of the second element. The third element, at least partly butt-coupled to the first element, comprises an intermediate waveguide structure supporting intermediate optical modes. At least part of the second element supports at least one optical mode that interacts with rare-earth dopants. A tapered waveguide structure in at least one of the second and the third elements facilitates efficient adiabatic transformation between the second optical mode and at least one of the intermediate optical modes. No adiabatic transformation occurs between any of the intermediate optical modes and the first optical mode.
    Type: Grant
    Filed: September 19, 2022
    Date of Patent: November 7, 2023
    Assignee: Nexus Photonics Inc.
    Inventors: Minh Tran, Tin Komljenovic, Chong Zhang
  • Patent number: 11022689
    Abstract: A lidar system comprising with a light source, an optical link, and a sensor head. The light source can include a seed laser to produce pulses of light and an optical preamplifier to amplify the pulses of light. The optical link can convey amplified pulses of light to the sensor head remotely located from the light source. The sensor head can include an optical booster amplifier, a scanner to scan amplified output pulses of light across a field of regard, and a receiver to detect pulses of light scattered by a target located a distance from the sensor head.
    Type: Grant
    Filed: November 6, 2017
    Date of Patent: June 1, 2021
    Assignee: Luminar, LLC
    Inventors: Alain Villeneuve, Joseph G. LaChapelle, Jason M. Eichenholz
  • Patent number: 10892596
    Abstract: An optical module includes a first base member, a second base member disposed spatially away from the first base member, a first laser disposed on the first base member and configured to emit red light, a second laser disposed on the second base member and configured to emit light with a color other than red, and a first electronic cooling module disposed in contact with the first base member and configured to adjust a temperature of the first laser.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: January 12, 2021
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yohei Enya, Hiromi Nakanishi
  • Patent number: 10655896
    Abstract: A device includes a substrate, a micro-electro-mechanical system (MEMS) device disposed on the substrate, a controller disposed on the substrate, a heating element, and an enclosure. The heating element is configured to generate heat in response to a signal generated by the controller. The enclosure encloses the MEMS sensor device, the controller, and the heating element. The controller is configured to generate the signal responsive to temperature measurements within the enclosure. The signal causes the heating element to generate heat and maintain a predetermined temperature within the enclosure.
    Type: Grant
    Filed: December 15, 2016
    Date of Patent: May 19, 2020
    Assignee: InvenSense, Inc.
    Inventors: Muhammad Maaz Qazi, Brian H. Kim, Haijun She
  • Patent number: 10348051
    Abstract: In one embodiment, a fiber-optic amplifier includes an optical gain fiber configured to amplify input light received from a seed laser. The optical gain fiber includes a first gain section configured to: receive the seed-laser input light and co-propagating pump light; and amplify the seed-laser input light as it propagates along the first gain section. The seed-laser input light and the co-propagating pump light propagate along the first gain section in a same direction. The optical gain fiber also includes a second gain section configured to: receive the amplified input light from the first gain section; receive counter-propagating pump light; and further amplify the amplified input light as it propagates along the second gain section. The amplified input light and the counter-propagating pump light propagate along the second gain section in opposite directions. The fiber-optic amplifier also includes a first pump laser diode and a second pump laser diode.
    Type: Grant
    Filed: May 18, 2018
    Date of Patent: July 9, 2019
    Assignee: Luminar Technologies, Inc.
    Inventors: Lawrence Shah, Alain Villeneuve, Cheng Zhu, Laurance S. Lingvay
  • Patent number: 10340649
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for providing C-band and L-band transmission exhibiting increased power efficiency by diverting a portion of C-band optical energy to an input of L-band optical amplifiers (C-seeding) while optionally employing circulators to eliminate the need for optical isolators.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: July 2, 2019
    Assignee: NEC CORPORATION
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriquez, Takanori Inoue, Yoshihisa Inada
  • Patent number: 9001416
    Abstract: The invention relates to a pulsed light source capable of effectively utilizing optical power and selecting the pulse width of output pulsed light. A pulsed light source has a MOPA structure, and comprises a seed light source and an optical fiber amplifier. The seed light source includes a semiconductor laser outputting pulsed light. In the optical fiber amplifier, an optical filter branches pulsed light amplified by a YbDF into a first wavelength component including the peak wavelength and the remaining second wavelength component. An optical switch outputs one of the pulsed light of the first wavelength component and the pulsed light of the second wavelength component which are inputted. Another YbDF amplifies the pulsed light outputted from the optical switch.
    Type: Grant
    Filed: May 22, 2012
    Date of Patent: April 7, 2015
    Assignee: Megaopto Co., Ltd.
    Inventor: Motoki Kakui
  • Patent number: 8964877
    Abstract: A method includes transmitting a first set of transmission signals over an operating frequency band. The method includes detecting if a second set of transmission signals are transmitted adjacent the operating frequency band and reducing power to a subset of the first set of transmission signals when the second set of transmission signals are detected.
    Type: Grant
    Filed: June 19, 2012
    Date of Patent: February 24, 2015
    Assignee: Texas Instruments Incorporated
    Inventors: Uri Weinrib, Alon Cheifetz, Schlomit Moisa
  • Publication number: 20150009555
    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: Application
    Filed: August 30, 2012
    Publication date: January 8, 2015
    Applicant: NEC Corporation
    Inventor: Yurie Takahashi
  • Patent number: 8922876
    Abstract: An optical amplifying device includes an optical amplification medium configured to be excited by excitation light and amplify signal light, a light loss detector configured to detect a light loss of an optical component optically connected to the optical amplification medium in the amplifying device, and a noise figure deterioration detector configured to detect, based on the light loss detected by the light loss detector, deterioration of a noise figure of the optical amplification medium.
    Type: Grant
    Filed: August 30, 2012
    Date of Patent: December 30, 2014
    Assignee: Fujitsu Limited
    Inventor: Tomoaki Takeyama
  • Patent number: 8902497
    Abstract: A spatial filter includes a first filter element and a second filter element overlapping with the first filter element. The first filter element includes a first pair of cylindrical lenses separated by a first distance. Each of the first pair of cylindrical lenses has a first focal length. The first filter element also includes a first longitudinal slit filter positioned between the first pair of cylindrical lenses. The second filter element includes a second pair of cylindrical lenses separated by a second distance. Each of the second pair of cylindrical lenses has a second focal length. The second filter element also includes a second longitudinal slit filter positioned between the second pair of cylindrical lenses.
    Type: Grant
    Filed: September 7, 2011
    Date of Patent: December 2, 2014
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Alvin Charles Erlandson, Andrew James Bayramian
  • Publication number: 20140347720
    Abstract: In the method for processing a signal light from free-space by amplifying said signal for free-space optical communications. wherein the improvement includes the steps of (a) pre-amplifying said signal light with low noise; and (b) coupling said signal light into a multimode filter which reduces coupling hisses compared to single mode filters.
    Type: Application
    Filed: August 8, 2014
    Publication date: November 27, 2014
    Inventors: Robert T. Carlson, Daniel J. Creeden
  • Patent number: 8837948
    Abstract: In the method for processing a signal light from free-space by amplifying said signal for free-space optical communications, wherein the improvement includes the steps of (a) pre-amplifying said signal light with low noise; and (b) coupling said signal light into a multimode filter which reduces coupling losses compared to single mode filters.
    Type: Grant
    Filed: June 24, 2010
    Date of Patent: September 16, 2014
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Robert T. Carlson, Daniel J. Creeden
  • Patent number: 8810901
    Abstract: In at least one embodiment of the wavelength-tunable light source (1), it comprises an output source (2), which is capable in operation of generating electromagnetic radiation (R). Furthermore, the light source (1) has a wavelength-selective first filter element (5), which is situated downstream from the output source (2). Moreover, the light source (1) contains a first amplifier medium (3), which is situated downstream from the first filter element (5) and is capable of at least partial amplification of the radiation (R) emitted by the output source (2). The light source (1) further comprises at least one wavelength-selective second filter element (6), which is situated downstream from the first amplifier medium (3), the second filter element (6) having an optical spacing (L) to the first filter element (5). The first filter element (5) and the at least one second filter element (6) are tunable via a control unit (11), which the light source (1) has.
    Type: Grant
    Filed: September 3, 2009
    Date of Patent: August 19, 2014
    Assignee: Lightlab Imaging, Inc.
    Inventors: Robert Alexander Huber, Christoph Eigenwillig, Benjamin Biedermann
  • Patent number: 8773754
    Abstract: An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier system for seeding Nd: or Yb: doped regenerative amplifiers. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator, and may undergo spectral narrowing or broadening, wavelength converting, temporal pulse compression or stretching, pulse attenuation and/or lowering the repetition rate of the pulse train. The conditioned pulses are subsequently coupled into an Yb: or Nd: fiber amplifier. The amplified pulses are stretched before amplification in the regenerative amplifier that is based on an Nd: or Yb: doped solid-state laser material, and then recompressed for output.
    Type: Grant
    Filed: March 22, 2011
    Date of Patent: July 8, 2014
    Assignee: IMRA America, Inc.
    Inventors: Donald J. Harter, Gyu C. Cho, Martin E. Fermann, Ingmar Hartl
  • Patent number: 8773753
    Abstract: An optical amplifier amplifies signal light and includes a pump light source that outputs pump light of a wavelength different from that of the signal light; a combining unit that combines the signal light and the pump light output by the pump light source, to output combined light; an amplifying unit that has non-linear optical media that transmit the combined light to amplify the signal light, the amplifying unit further removing, in the non-linear optical media, idler light generated from the signal light and the pump light, and outputting light that results; and an extraction filter that extracts the signal light from the light output by the amplifying unit.
    Type: Grant
    Filed: January 10, 2011
    Date of Patent: July 8, 2014
    Assignee: Fujitsu Limited
    Inventors: Tomoyuki Kato, Fumio Futami, Shigeki Watanabe
  • Publication number: 20140185131
    Abstract: The present invention discloses a multi-wavelength light source apparatus. The multi-wavelength light source apparatus includes: a pump light source, configured to provide pump light; an erbium-doped optical fiber, configured to absorb energy of the pump light and emit wide-spectrum laser light; and an optical fiber, configured to filter the wide-spectrum laser light and output a multi-wavelength optical signal in a free spectral range of the optical filter, where the multi-wavelength optical signal is incident on the erbium-doped optical fiber, and the erbium-doped optical fiber is further configured to re-amplify and output the incident multi-wavelength optical signal. In the multi-wavelength light source apparatus in the embodiments of the present invention, a wavelength of output light can be selected, spectral energy of the output light is concentrated, and power of the output light is high.
    Type: Application
    Filed: December 13, 2013
    Publication date: July 3, 2014
    Applicant: Huawei Technologies Co., Ltd.
    Inventor: Xiquan Dai
  • Publication number: 20140153083
    Abstract: A relative intensity noise (RIN)-suppressed light source is provided that includes a light source that produces an incoming light. A semiconductor optical amplifier (SOA) arrangement receives the incoming light and provides a significant reduction in the RIN as its output. The SOA arrangement includes one or more SOAs in saturation that behave like a high pass filter for the amplitude of the incoming light.
    Type: Application
    Filed: November 30, 2012
    Publication date: June 5, 2014
    Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
    Inventor: MASSACHUSETTS INSTITUTE OF TECHNOLOGY
  • Publication number: 20140146387
    Abstract: A device is described herein which may comprise an optical amplifier having a gain band including wavelengths ?1 and ?2, with ?1??2; a pre-pulse seed laser having a tuning module for tuning a pre-pulse output to wavelength ?1; a main pulse seed laser generating a laser output having wavelength, ?2; and a beam combiner for directing the pre-pulse output and the main pulse output on a common path through the optical amplifier.
    Type: Application
    Filed: February 3, 2014
    Publication date: May 29, 2014
    Applicant: CYMER, LLC
    Inventors: Kai-Chung Hou, Richard L. Sandstrom, William N. Partlo, Daniel J.W. Brown, Igor V. Fomenkov
  • Patent number: 8717668
    Abstract: A combined large mode area, fiber cable amplifier and laser beam transport fiber cable is disclosed that transports laser beams output from a compact, high power, solid state laser to remote locations while improving the beam quality and amplifying the beam to compensate for losses in the fiber cable. The fiber cable is clad and is cladding pumped to compensate for the losses in the fiber cable.
    Type: Grant
    Filed: May 8, 2012
    Date of Patent: May 6, 2014
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Daniel J Creeden, Peter A Budni, Robert C Guyer
  • Publication number: 20140029082
    Abstract: An optical amplifier includes: a rare-earth doped fiber configured to amplify signal light to thereby produce a amplified signal light; a gain control circuit configured to control an optical gain of the rare-earth doped fiber; a photodetector configured to detect intensities of different wavelength of light obtained from the amplified signal light; and an abnormality detection circuit configured to detect an abnormality of the signal light in accordance with a ratio or a difference between the intensities of the different wavelength.
    Type: Application
    Filed: May 29, 2013
    Publication date: January 30, 2014
    Applicant: FUJITSU LIMITED
    Inventor: Hiroyuki ITOH
  • Publication number: 20130342894
    Abstract: The present invention relates to a wavelength conversion laser system and provides a wavelength conversion laser system including a semiconductor optical amplifier, an optical condenser that condenses light emitted from the optical amplifier, a diffraction grating plate that induces wavelength components of the light having passed through the optical condenser in different directions, and an optical very large scale integration (VLSI) processor.
    Type: Application
    Filed: August 23, 2013
    Publication date: December 26, 2013
    Applicant: Ytel Photonics Inc.
    Inventor: Yong Tak Lee
  • Patent number: 8593723
    Abstract: A method of manufacturing a variable wavelength interference filter includes forming an electrostatic gap forming groove, a wiring forming groove extending from the electrostatic gap forming groove to an outer peripheral edge of the chip region, and an air communication groove through which the wiring groove forming groove communicates with the outside of the first substrate, in a chip region of a first substrate.
    Type: Grant
    Filed: April 12, 2011
    Date of Patent: November 26, 2013
    Assignee: Seiko Epson Corporation
    Inventors: Koji Kitahara, Akira Sano
  • Patent number: 8559746
    Abstract: System, method, and apparatus for smoothing of edges in images to remove irregularities are disclosed. In one aspect of the present disclosure, a method of image processing includes, identifying an edge in an image having an associated set of edge characteristics, determining the associated set of edge characteristics, and applying a low pass filter to a pixel of the edge based on the associated set of edge characteristics to generate a second image based on the image, wherein the edge in the image is smoothed in the second image. The method further includes generating a third image which is a blend of the original image and the second (edge-smoothed) image based on the associated set of edge characteristics.
    Type: Grant
    Filed: September 4, 2008
    Date of Patent: October 15, 2013
    Assignee: Silicon Image, Inc.
    Inventor: Dale Richard Adams
  • Patent number: 8514484
    Abstract: An optical amplifier includes an optical fiber which includes a core in which the signal light is propagated and with which a rare-earth element is doped; a laser that is optically coupled to an end of the optical fiber, providing the optical fiber with an excitation light; and a filter which is formed in the optical fiber and removes a light within a wavelength range, from the core, among lights propagated in the core, wherein the filter comprises a first filter that is arranged at a stage of the optical fiber and removes a first light in a first wavelength range, and a second filter that is arranged at a subsequent stage of the optical fiber and removes a second light in a second wavelength range, wherein a wavelength of the second light is longer than a wavelength of the first light.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: August 20, 2013
    Assignee: Fujitsu Limited
    Inventor: Miki Onaka
  • Patent number: 8433199
    Abstract: A system and method for filtering and enhancing signals from a noise background based on the nonlinear interaction of waves. The system and method amplify low-level signals, hide information in the signals, and then nonlinearly recover the signals. With the present invention, this can be performed for both spatial beams and temporal pulses. The signal self-filters and self-amplifies at the expense of the surrounding noise via the nonlinear medium.
    Type: Grant
    Filed: March 18, 2009
    Date of Patent: April 30, 2013
    Assignee: Princeton University
    Inventors: Jason W. Fleischer, Dmitry V. Dylov
  • Patent number: 8358461
    Abstract: In at least one embodiment of the wavelength-tunable light source, it comprises an output source, which is capable in operation of generating electromagnetic radiation. Furthermore, the light source has a wavelength-selective first filter element, which is situated downstream from the output source. Moreover, the light source contains a first amplifier medium, which is situated downstream from the first filter element and is capable of at least partial amplification of the radiation emitted by the output source. The light source further comprises at least one wavelength-selective second filter element, which is situated downstream from the first amplifier medium, the second filter element having an optical spacing to the first filter element. The first filter element and the at least one second filter element are tunable via a control unit, which the light source has.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: January 22, 2013
    Assignee: Lightlab Imaging Inc.
    Inventors: Robert Alexander Huber, Christoph Eigenwillig, Benjamin Biedermann
  • Patent number: 8351111
    Abstract: A light generation and amplification system includes a length of laser-active filter fiber having a refractive index profile that suppresses unwanted Stokes orders at wavelengths longer than a target wavelength and that has normal dispersion over its operating wavelength. A nested series of reflectors is provided at the fiber's input and output ends, and are configured to provide a nested series of Raman cavities, separated in wavelength by approximately the respective Stokes shifts. The first cavity in the series is a combined cavity that provides laser oscillation due to a combination of ionic gain and feedback at a selected first wavelength and that provides Raman gain to light at the first Stokes shift of the first wavelength when light at the first wavelength has an energy exceeding a Raman scattering threshold. The Raman cavities provide a stepwise transition between the first wavelength and the target wavelength.
    Type: Grant
    Filed: May 11, 2010
    Date of Patent: January 8, 2013
    Assignee: OFS Fitel, LLC
    Inventors: David J. DiGiovanni, Clifford E. Headley, Jeffrey W. Nicholson, Man F. Yan
  • Patent number: 8320039
    Abstract: An optical amplifier comprises at least two gain regions, an intermediate region situated between the gain regions, and a transition region situated between the intermediate region and each gain region. The aforesaid regions have claddings that collectively form a path for pump radiation propagating from at least one of the gain regions to the other gain region, and cores that collectively form a path for signal radiation propagating from at least one of the gain regions to the other gain region. The cores in the gain regions support multiple propagating optical modes, including at least one signal mode and at least one non-signal mode. The intermediate region, however, supports fewer propagating core modes than are supported by the gain regions. The transition regions are conformed such that when radiation in propagating non-signal core modes passes from the gain regions into the intermediate region, it is at least partly coupled into cladding modes of the intermediate region.
    Type: Grant
    Filed: April 16, 2010
    Date of Patent: November 27, 2012
    Assignee: LGS Innovations LLC
    Inventors: Douglas P. Holcomb, Thomas Huntington Wood, Paul Wysocki
  • Patent number: 8294981
    Abstract: Described are Gain Flattening Filters (GFFs) implemented using mechanical translating assemblies to move selected thin film Gain Attenuating Filters (GAFs), and combinations of selected GAFs, into or out of the output path from an optical amplifier. The GAFs may be used singly, or in combinations that synthesize many target filter characteristics. The GFF is primarily adapted for WDM systems operating with a wavelength range of approximately 1520 nm to 1620 nm. Several embodiments are shown for effectively combining different GAFs to provide multiple GFF curves.
    Type: Grant
    Filed: September 15, 2009
    Date of Patent: October 23, 2012
    Assignee: Oclaro Technology Limited
    Inventors: Christopher Lin, Ming Cai, Martin Williams
  • Patent number: 8248688
    Abstract: Embodiments of laser systems advantageously use pulsed optical fiber-based laser source (12) output, the temporal pulse profile of which may be programmed to assume a range of pulse shapes. Pulsed fiber lasers are subject to peak power limits to prevent an onset of undesirable nonlinear effects; therefore, the laser output power of these devices is subsequently amplified in a diode-pumped solid state photonic power amplifier (DPSS-PA) (16). The DPSS PA provides for amplification of the desirable low peak power output of a pulsed fiber master oscillator power amplifier (14) to much higher peak power levels and thereby also effectively increases the available energy per pulse at a specified pulse repetition frequency. The combination of the pulsed fiber master oscillator power amplifier and the diode-pumped solid state power amplifier is referred to as a tandem solid state photonic amplifier (10).
    Type: Grant
    Filed: July 25, 2007
    Date of Patent: August 21, 2012
    Assignee: Electro Scientific Industries, Inc.
    Inventors: Brian W. Baird, David M. Hemenway, Xiaoyuan Peng, Wensheng Ren
  • Publication number: 20120154810
    Abstract: An agent sensing system may comprise an emitter optical resonator, a functionalized optical resonator, and a reference optical resonator. The emitter optical resonator may be configured to emit light at one or more system peak wavelengths. The functionalized optical resonator may be optically coupled to the emitter optical resonator and configured to propagate the emitted light in the absence of a particular agent, and filter the emitted light in the presence of the particular agent. The reference optical resonator may be optically coupled to at least one of the emitter optical resonator and the functionalized optical resonator such that an intensity of light propagated by the reference optical resonator is based at least on whether light emitted by the emitter optical resonator is filtered or propagated by the functionalized optical resonator.
    Type: Application
    Filed: July 15, 2009
    Publication date: June 21, 2012
    Inventors: Frank B. Jaworski, Anuradha M. Agarwal
  • Patent number: 8179932
    Abstract: A pulse laser apparatus includes a laser configured to generate a pulse of a laser beam, a fiber amplifier, and a pulse compressor. The fiber amplifier includes a rare-earth doped fiber that exhibits normal dispersion at a wavelength of the laser beam generated from the laser. The pulse laser apparatus further includes a unit configured to give a loss to energy portions in a wavelength region corresponding to a zero-dispersion wavelength of the rare-earth doped fiber and/or a wavelength region longer than the zero-dispersion wavelength within a wavelength spectrum of the laser beam having been chirped in the fiber amplifier.
    Type: Grant
    Filed: April 25, 2011
    Date of Patent: May 15, 2012
    Assignee: Canon Kabushiki Kaisha
    Inventors: Toshihiko Ouchi, Takashi Katagiri, Kentaro Furusawa
  • Publication number: 20120105945
    Abstract: A spatial filter includes a first filter element and a second filter element overlapping with the first filter element. The first filter element includes a first pair of cylindrical lenses separated by a first distance. Each of the first pair of cylindrical lenses has a first focal length. The first filter element also includes a first longitudinal slit filter positioned between the first pair of cylindrical lenses. The second filter element includes a second pair of cylindrical lenses separated by a second distance. Each of the second pair of cylindrical lenses has a second focal length. The second filter element also includes a second longitudinal slit filter positioned between the second pair of cylindrical lenses.
    Type: Application
    Filed: September 7, 2011
    Publication date: May 3, 2012
    Applicant: Lawrence Livermore National Security, LLC
    Inventors: Alvin Charles Erlandson, Andrew James Bayramian
  • Publication number: 20120105932
    Abstract: A device representing a reflector, for example an evanescent reflector or a multilayer interference reflector, with at least one reflectivity stopband is disclosed. A medium with means of generating optical gain is introduced into the layer or several layers of the reflector. The optical gain spectrum preferably overlaps with the spectral range of the reflectivity stopband. This reflector is attached to multilayer passive cavity structure made of semiconducting, and/or dielectric, and/or metallic materials with the inserted tools of achieving wavelength selection of the optical modes. For example, volume Bragg gratings, distributed feedback gratings or patterns, using of vertical optical cavities surrounded by multilayer Bragg reflectors can be applied. The optical modes of the passive optical cavity partially penetrate into the gain region of the reflector.
    Type: Application
    Filed: October 28, 2010
    Publication date: May 3, 2012
    Inventor: Nikolay Ledentsov
  • Publication number: 20120092755
    Abstract: Embodiments of laser systems advantageously use pulsed optical fiber-based laser source (12) output, the temporal pulse profile of which may be programmed to assume a range of pulse shapes. Pulsed fiber lasers are subject to peak power limits to prevent an onset of undesirable nonlinear effects; therefore, the laser output power of these devices is subsequently amplified in a diode-pumped solid state photonic power amplifier (DPSS-PA) (16). The DPSS PA provides for amplification of the desirable low peak power output of a pulsed fiber master oscillator power amplifier (14) to much higher peak power levels and thereby also effectively increases the available energy per pulse at a specified pulse repetition frequency. The combination of the pulsed fiber master oscillator power amplifier and the diode-pumped solid state power amplifier is referred to as a tandem solid state photonic amplifier (10).
    Type: Application
    Filed: July 25, 2007
    Publication date: April 19, 2012
    Applicant: Electro Scientific Industries, Inc.
    Inventors: Brian W. Baird, David M. Hemenway, Xiaoyuan Peng, Wensheng Ren
  • Publication number: 20120075691
    Abstract: In at least one embodiment of the wavelength-tunable light source, it comprises an output source, which is capable in operation of generating electromagnetic radiation. Furthermore, the light source has a wavelength-selective first filter element, which is situated downstream from the output source. Moreover, the light source contains a first amplifier medium, which is situated downstream from the first filter element and is capable of at least partial amplification of the radiation emitted by the output source. The light source further comprises at least one wavelength-selective second filter element, which is situated downstream from the first amplifier medium, the second filter element having an optical spacing to the first filter element. The first filter element and the at least one second filter element are tunable via a control unit, which the light source has.
    Type: Application
    Filed: November 30, 2011
    Publication date: March 29, 2012
    Applicant: LIGHTLAB IMAGING, INC.
    Inventors: Robert Alexander Huber, Christoph Eigenwillig, Benjamin Biedermann
  • Publication number: 20120062984
    Abstract: Techniques and devices for producing short laser pulses based on chirped pulse amplification.
    Type: Application
    Filed: September 13, 2010
    Publication date: March 15, 2012
    Applicant: Calmar Optcom, Inc. dba Calmar Laser, Inc.
    Inventors: Sha Tong, Jerry Prawiharjo, Hong Cong, Daniel Beom Soo Soh, Lawrence C. West, Anthony Hong Lin
  • Publication number: 20120062985
    Abstract: The present invention relates to an optical fiber amplifying module equipped with a structure for stably attaining a high gain even when amplifying light having a low duty cycle. The optical fiber amplifying module comprises at least three amplification optical fibers successively arranged from an input connector to an output collimator. A bandpass filter is arranged between the first- and second-stage amplification optical fibers. Control means having a structure constituted by optically passive components alone or a feedback structure functions so as to render an upper limit to a gain for input light in the first-stage amplification optical fiber, thereby preventing the deterioration in performances such as destruction of the bandpass filter from occurring in optical components positioned on the upstream side of the final-stage amplification optical fiber.
    Type: Application
    Filed: November 17, 2011
    Publication date: March 15, 2012
    Applicant: Sumitomo Electric Industries, Ltd
    Inventor: Motoki KAKUI
  • Patent number: 8130802
    Abstract: A tunable laser includes an optical gain medium, a first resonator, a periodically tunable optical filter, and a second resonator in which light of a laser wavelength exhibits a round trip time T. The optical filter is arranged between the first resonator and the second resonator and is tuned with a period t. The period t is governed by t=(n/m) T, where n and m are integers and m/n is not an integer.
    Type: Grant
    Filed: November 4, 2009
    Date of Patent: March 6, 2012
    Assignee: Ludwig-Maximilians-Universitaet Muenchen
    Inventor: Robert Alexander Huber
  • Patent number: 8102595
    Abstract: In an optical transmission system, a controller acquires a noise light loss value, which indicates a loss that noise light output from an upstream-side optical amplifier undergoes during propagation to a downstream-side optical amplifier through an optical loss medium, and a signal beam loss value, which indicates a loss that a signal beam output from the upstream-side optical amplifier undergoes during propagation to the downstream-side optical amplifier through the optical loss medium, obtains, as a loss difference, a difference between the noise light loss value and the signal beam loss value and, when setting up the downstream-side optical amplifier, determines the gain of the downstream-side optical amplifier by compensating the loss difference.
    Type: Grant
    Filed: August 5, 2009
    Date of Patent: January 24, 2012
    Assignee: Fujitsu Limited
    Inventor: Takeshi Sakamoto
  • Publication number: 20110317256
    Abstract: A device is described herein which may comprise an optical amplifier having a gain band including wavelengths ?1 and ?2, with ?1??2; a pre-pulse seed laser having a tuning module for tuning a pre-pulse output to wavelength ?1; a main pulse seed laser generating a laser output having wavelength, ?2; and a beam combiner for directing the pre-pulse output and the main pulse output on a common path through the optical amplifier.
    Type: Application
    Filed: March 31, 2011
    Publication date: December 29, 2011
    Applicant: CYMER, INC.
    Inventors: Kai-Chung Hou, Richard L. Sandstorm, William N. Partlo, Daniel J.W. Brown, Igor V. Fomenkov
  • Patent number: 8081376
    Abstract: The invention relates to a light source apparatus having a structure for effectively suppressing a negative effect due to a nonlinear effect generated in propagation of an amplifying light, and realizing a stable operation. In the light source apparatus, light amplified in an optical amplifier fiber is emitted to the outside of the apparatus through an optical output fiber whose one end is connected to an output connecter. At this time, a part of Raman scattered light, generated in the optical output fiber, propagates toward an pumping light source through the optical amplifier fiber from the optical output fiber. An optical component having an insertion loss spectrum that attenuates the Raman scattered light but allows pumping light or light to be amplified to transmit therethrough, is provided on a propagation path of the Raman scattered light, due to the light component, the intensity of the Roman scattered light reaching the pumping light source is effectively reduced.
    Type: Grant
    Filed: May 27, 2008
    Date of Patent: December 20, 2011
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Motoki Kakui, Shinobu Tamaoki
  • Patent number: 8064130
    Abstract: It is an object of the present invention to provide an optical amplifier using optical amplification mediums each doped with a rare earth element for increasing amplification efficiency of signal light in S-band and the like. To this end, the optical amplifier is constituted such that, when performing optical amplification for S-band and the like in which a center wavelength of a gain peak in the optical amplification medium is located at an outside of a signal band, a gain coefficient of when a pumping condition of the optical amplification medium is maximum is set so that a parameter ? obtained by dividing a minimum value of the gain coefficient in the signal band by a maximum value of the gain coefficient outside of the signal band becomes a previously set value or more, wherein, for example, the parameter ? can be increased by controlling a temperature of each of a plurality of EDFs between which gain equalizers are disposed.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: November 22, 2011
    Assignee: Fujitsu Limited
    Inventors: Masato Nishihara, Yasushi Sugaya, Etsuko Hayashi
  • Patent number: 8045259
    Abstract: The invention relates to optical fibers for use in optical amplification of light, such as in optical fiber amplifiers and lasers and for use in delivery of high power light, in particular to a scheme for reducing amplified spontaneous emission at undesired wavelengths. The invention further relates to articles, methods and use. An object of the invention is achieved by a micro-structured optical fiber, which is adapted to guide light by the photonic bandgap effect and to have one or more pass bands and at least one stop-band over a wavelength range from ?stop1 to ?stop2. In an aspect of the invention, the at least one stop-band provides filter functions that suppress nonlinear effects.
    Type: Grant
    Filed: November 20, 2006
    Date of Patent: October 25, 2011
    Assignee: NKT Photonics A/S
    Inventors: Anders Petersson, Jes Broeng, René Engel Kristiansen
  • Publication number: 20110210252
    Abstract: A pulse laser apparatus includes a laser configured to generate a pulse of a laser beam, a fiber amplifier, and a pulse compressor. The fiber amplifier includes a rare-earth doped fiber that exhibits normal dispersion at a wavelength of the laser beam generated from the laser. The pulse laser apparatus further includes a unit configured to give a loss to energy portions in a wavelength region corresponding to a zero-dispersion wavelength of the rare-earth doped fiber and/or a wavelength region longer than the zero-dispersion wavelength within a wavelength spectrum of the laser beam having been chirped in the fiber amplifier.
    Type: Application
    Filed: April 25, 2011
    Publication date: September 1, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Toshihiko Ouchi, Takashi Katagiri, Kentaro Furusawa
  • Patent number: 8004753
    Abstract: A MO-PA type optical amplifier is provided which includes an oscillator and an amplifier including a fiber for optical amplification, including: a reflected-light wavelength conversion fiber which is provided on an optical path between the oscillator and the amplifier and which converts a wavelength of reflected-light traveling toward the oscillator due to Stimulated Raman Scattering; and a filter which is provided on the optical path between the oscillator and the amplifier and which eliminates the wavelength-converted light.
    Type: Grant
    Filed: December 24, 2009
    Date of Patent: August 23, 2011
    Assignee: Fujikura Ltd.
    Inventors: Michihiro Nakai, Tetsuya Sakai