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| Number | Title | Issue Date |
| 8189258 | Optical amplifier configuration An optical amplifier configuration for WDM (wavelength division multiplex) systems uses a common pump source connected to an input of an optical splitter deploying pump light via variable optical attenuators to a plurality of optical amplifiers. Control circuits det... | 05/29/2012 |
| 8081376 | Multi-stage fiber amplifier to suppress Raman scattered light 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 ampli... | 12/20/2011 |
| 8059334 | Optical fiber amplifier system and method An optical fiber amplifier system is described and comprises a first optical fiber having a doped core with a first gain spectral profile upon being pumped. The first optical fiber is adapted to receive an optical signal from a light source. A second optical fiber h... | 11/15/2011 |
| 7916386 | High power optical apparatus employing large-mode-area, multimode, gain-producing optical fibers Optical apparatus includes a multimode, gain-producing fiber for providing gain to signal light propagating in the core of the fiber, and a pump source for providing pump light that is absorbed in the core, characterized in that (i) the pump source illustratively co... | 03/29/2011 |
| 7894128 | Real-time terahertz imaging system for the detection of concealed objects A terahertz imaging system and method of use including a compact Yb-doped fiber laser-pumped ZGP crystal as a THz source and an uncooled microbolometer array as a detector. According to the present invention, semiconductor lasers are also drive current modulated to ... | 02/22/2011 |
| 7876497 | Multi-stage long-band optical amplifier with ASE re-use There is provided a long-band rare-earth-doped optical amplifier and method for amplifying an optical signal. The optical amplifier has a pre-, a mid- and a post-amplification stage. Only the mid-amplification stage is pumped with a pump light source. The other two ... | 01/25/2011 |
| 7729046 | Solid-state laser device with a crystal array In a laser device, a crystal array includes a laser gain crystal and an optically non-linear frequency conversion crystal. A pump source couples at least two mutually spatially separated pump beams into the crystal array. Between two pump beams, a saw kerf of the cr... | 06/01/2010 |
| 7372622 | Optical transmission system, optical repeater, and optical transmission method In a WDM transmission system employing a plurality of short wavelength bands having great attenuation due to optical fiber transmission, an optical repeater is constructed of a first multiplexing section and a second multiplexing section. The first multiplexing sect... | 05/13/2008 |
| 7346280 | Bi-directional long haul/ultra long haul optical communication link A bi-directional configuration is employed to implement a hybrid ultra long haul (ULH)/long haul (LH) optical transmission system. The link carries ULH channels and LH channels in opposite directions in different bands. Raman amplification is employed for the ULH ba... | 03/18/2008 |
| 7342228 | Method and apparatus for measurement of aerosols and imaging A lightweight, low-cost, and highly sensitive aerosol sensor measures aerosol concentrations remotely. A fiber laser sends pulses outward toward the target area from a carbon-fiber telescope using ultra-lightweight optical elements. Light is received back in the sam... | 03/11/2008 |
| 7339725 | Optical transmission systems including optical amplifiers and methods of use therein Optical transmission systems including a plurality of optical amplifiers configured to provide optical amplification of one or more information carrying optical signal wavelengths. At least two of the optical amplifiers are operated to provide net losses or net gain... | 03/04/2008 |
| 7336869 | System and method for implementing a high capacity unrepeatered optical communication system A method of communicating an optical signal includes generating an optical signal at a bit rate of at least 2.5 Gb/s. The optical signal including at least thirty optical channels. In one particular embodiment, at least some of the thirty optical channels reside wit... | 02/26/2008 |
| 7333416 | Optical pickup apparatus for recording or reproducing information for an optical information recording medium and objective lens for optical pickup apparatus An objective lens of an optical pickup apparatus converges a divergent light flux onto an information recording surface. The following conditional formula is satisfied: |δSA1/δU|·|δU|+|δSA2/δT|·|δT|≦0.07... | 02/19/2008 |
| 7321708 | Optical fibre amplifier An optical amplifier is described that comprises at least two sections of amplifying optical fibre and pumping means for optically pumping the amplifying optical fibre. Optical fibre support means, for example a channel or channels in a substrate, are also provided ... | 01/22/2008 |
| 7321461 | Broadband light source suitable for pump module for Raman amplification and Raman amplifier using same Provided are a broadband light source suitable for a pump light module for Raman amplification and a Raman amplifier which uses such light source. The broadband light source comprises a light source system for emitting light having two or more different output peak ... | 01/22/2008 |
| 7286283 | Optical fiber coupling arrangement Apparatus for optically pumping a clad amplifier fiber includes one or more transmission fibers arranged and configured to insert pump-light from a pump light source such as a diode-laser into the cladding of the amplifier fiber. The pump light propagates through th... | 10/23/2007 |
| 7274871 | Optical transmission system with raman amplifiers comprising a supervisory system An optical transmission system having a supervisory system of devices disposed along an optical link. Counter-propagating Raman amplifiers are disposed along the optical link. Low-frequency supervisory signals are superimposed on the optical signals traveling on the... | 09/25/2007 |
| 7269324 | Helical fiber optic mode scrambler The methods and apparatus of the present invention provide advantages for remote laser delivery systems that conduct high levels of light energy through a fiber optic cable to a selectable target surface. Helical fiber optic mode scramblers in accordance with the pr... | 09/11/2007 |
| 7253944 | Multi-stage raman amplifier A Raman amplifier having at least a first and a second optical Raman-active fiber disposed in series with each other is disclosed. A first pump source is connected to the first Raman-active fiber, and is adapted for emitting and coupling into the first Raman-active ... | 08/07/2007 |
| 7254326 | Optical transmission system with raman amplifiers comprising a supervisory system An optical transmission system having a supervisory system of devices disposed along an optical link. Co-propagating Raman amplifiers are disposed along the optical link. Low frequency supervisory signals are superimposed on the optical signals traveling on the opti... | 08/07/2007 |
| 7251394 | Optical isolator with tilted optical isolator element An optical isolator including: (a) a support body; (b) an optical fiber assembly disposed in the support body including a first single mode fiber, a first graded index fiber, a coreless fiber, a second graded index fiber, and a second single mode fiber; and (c) an o... | 07/31/2007 |
| 7245424 | Amplification device utilizing thulium doped modified silicate optical fiber A device amplifies light at wavelengths in the vicinity of 1420-1530 nm, using thulium doped silica-based optical fiber. This wavelength band is of interest as it falls in the low-loss optical fiber telecommunications window, and is somewhat shorter in wavelength th... | 07/17/2007 |
| 7242519 | Raman amplifier and optical transmission system using the same It is an object of the present invention to provide a Raman amplifier capable of easily reducing the wavelength deviation of a Raman gain while suppressing system performance degradation, and an optical transmission system using such a Raman amplifier. To this end, ... | 07/10/2007 |
| 7230958 | Raman amplifier and raman pumping method Provided are a Raman amplifier and a Raman pumping method. A light source unit outputs a pumping light having a wavelength that periodically changes. A light intensity control unit varies a light intensity of the pumping light using the pumping light to improve the ... | 06/12/2007 |
| 7224513 | Pumping light source having amplification-band extending function for Raman amplification, Raman amplifier using the same, and method and program for setting amplification band extension A pumping light source unit for Raman amplification includes at least one pumping light source that outputs a first pumping light covering a current amplification band; at least one additional pumping light source that outputs a second pumping light covering an ampl... | 05/29/2007 |
| 7221822 | Multi-fibre arrangement for high power fibre lasers and amplifiers An optical fiber arrangement has at least two optical fiber sections, each optical fiber section defining an outside longitudinally extending surface. The outside longitudinally extending surfaces are in optical contact with each other. The invention further provide... | 05/22/2007 |
| 7215836 | System for amplifying optical signals The invention is in the field of distributed Raman amplification for digital and analog transmission applications and other applications, e.g., instrumentation and imaging applications, including HFC-CATV applications. In particular, the invention uses a high power ... | 05/08/2007 |
| 7206124 | Gain-providing optical power equalizer Disclosed is a gain-providing optical power equalizer which can equalize optical channel output or gain while amplifying signal output. In prior art technologies, optical power equalization has been achieved by attenuating signal output differently depending upon op... | 04/17/2007 |
| 7204190 | Method and device for initiation and ignition of explosive charges through self-destruction of a laser source The present invention relates to a new method, based on laser technology, of initiating explosive charges (6, 10, 17, 30), and a device which is intended for initiating explosives and in accordance with said method functions according to entirely new principl... | 04/17/2007 |
| 7202995 | Method and apparatus for communicating status in a lightwave communication system employing optical amplifiers A repeater node for an optical transmission system provides amplification of optical signals and uses a modulated pump signal to transfer status information about the repeater node to a control system via an optical supervisory signal. The pump signal supplied by a ... | 04/10/2007 |
| 7180654 | Raman amplifier Multi-wavelength light, including a plurality of segments of light signal with a different wavelength each, is inputted into a Raman amplification fiber. Pumping light generated by a pumping light source is supplied to the Raman amplification fiber in the opposite d... | 02/20/2007 |
| 7181119 | Optically amplifying waveguide, optical amplifier module, and optical communication system An optically amplifying waveguide that can have a gain having a small wave-length dependency in a wavelength range shorter than the C-band, and the like. The optical amplifier module 1 optically amplifies a signal lightwave that has a wavelength lying in a wa... | 02/20/2007 |
| 7177073 | Multiple order Raman amplifier A Raman amplifier for use in an optical fiber communication system with dispersion compensation has a first order Raman pump source and a second order Raman pump source both coupled to the input ports of a four-port optical coupler having two input ports and two out... | 02/13/2007 |
| 7174097 | Method and an apparatus for signal transmission A method and apparatus for transmitting a plurality of signals having different wavelengths through a length of optical cable which is caused to provide distributed gain by being subjected to Raman pumping at a plurality of pump wavelengths, the power levels of the ... | 02/06/2007 |
| 7158290 | Controlling apparatus for optical amplifier and controlling method thereof An optical amplifier is provided with a controlling unit for controlling a gain of the optical amplifier based on input light power and output light power of the optical amplifier, as well as a gain control amount variable unit for changing the gain control amount o... | 01/02/2007 |
| 7154662 | Broadband Raman amplifier The present invention provides a wide bandwidth, gain flattened Raman amplifier including a laser source of pump radiation, and means for producing from the pump source a plurality of wavelengths of pump radiation including means for providing adjustable optical fee... | 12/26/2006 |
| 7130111 | Optical amplifier with transverse pump An optical amplifier comprises a device substrate, a first waveguide embedded in the device substrate, and a plurality of lasers. The lasers are positioned to provide a first plurality of light beams substantially transverse to the first waveguide. ... | 10/31/2006 |
| 7130121 | Erbium-doped fiber amplifier and integrated module components An EDFA with integrated input and output modules is presented. The integrated input module has a packaged pump laser diode mounted to the metal EDFA package to provide a heat sink for the pump laser diode which sends the pump laser light over a optical fiber section... | 10/31/2006 |
| 7123836 | All-optical network distribution system The optical fiber-based communication system comprises a distribution optical fiber that extends proximately to a plurality of end users, and tap-off modules coupled to the distribution optical fiber at intervals along its length. Each of the tap-off modules include... | 10/17/2006 |
| 7116468 | Design of quasi-phasematched optical frequency converters Quasi-phasematching design to provide an approximation to a desired spectral amplitude response A(f) is provided. An initial phase response φ(f) corresponding to A(f) is generated. Preferably, d2φ(f)/df2 is proportional to A2(f). A... | 10/03/2006 |
