Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 8169693 | Fiber bundle phase conjugate mirror An improved method and apparatus for passively conjugating the phases of a distorted wavefronts resulting from optical phase mismatch between elements of a fiber laser array are disclosed. A method for passively conjugating a distorted wavefront comprises the steps ... | 05/01/2012 |
| 8098425 | Fiber communication system, fiber amplifier, and method for fabricating fiber amplifier The present invention discloses a fiber amplifier, a fabricating method thereof, and a fiber communication system. The fiber amplifier includes at least a pump laser, at least a gain medium and at least an integrated optical component. The integrated optical compone... | 01/17/2012 |
| 8089690 | Multistage fiber amplifier and method for adapting a pump power of a multistage fiber amplifier The invention relates to a multistage fiber amplifier having a first amplifying fiber, at least one further amplifying fiber connected in series with the first amplifying fiber, a pump source, a first pump signal fed to the first amplifying fiber, and a further pump... | 01/03/2012 |
| 8085464 | Multi-clad optical fibre amplifier with optimized pumping An optical amplifier for amplifying an optical signal (1002), the optical amplifier comprising: an optical fibre, the optical fibre including a doped core, an inner cladding extending substantially radially outwardly from the doped core and an outer cladding ... | 12/27/2011 |
| 7940454 | Optical parametric amplifier In an optical parametric amplifier of the invention, pumping light which is amplified using a practical optical amplifier such as an EDFA is supplied together with signal light having a wavelength outside the amplification band of the optical amplifier, to a nonline... | 05/10/2011 |
| 7911685 | Control of a light source providing excitation light A controller monitors output level variation rate of excitation light outputted by a light source in accordance with a drive current of the light source and provided to a rare-earth doped amplifying medium so that a signal light is amplified as the signal light trav... | 03/22/2011 |
| 7876496 | Free-space optical module for optical amplification An integrated optical-amplification module includes a housing member, a first input optical terminal configured to receive an optical signal, a second input, optical terminal that can receive a pump light, and an output optical terminal that can output a combined op... | 01/25/2011 |
| 7835069 | WDM optical amplifier with heat radiation from laser source to amplification medium An optical direct amplifier lowers the power consumption with a simple structure at a low cost. This amplifier includes an optical amplification medium (e.g., optical fiber) that carries out an optical amplification function in response to optical excitation by an e... | 11/16/2010 |
| 7791792 | Transient optical power suppressing apparatus, method, and network An apparatus for suppressing optical power transients includes a variable optical attenuator receiving an input optical signal and outputting an output optical signal; an optical power sensing element coupled to the input optical signal and sensing a portion of the ... | 09/07/2010 |
| 7773294 | Low-average-power parabolic pulse amplification There is provided a parabolic pulse amplifier for amplifying a pulse light signal. The amplifier comprises an ytterbium-doped amplification waveguide pumped using a pump source with a pump central wavelength substantially offset from the absorption transition peak w... | 08/10/2010 |
| 7738166 | Fiber amplifier with integrated fiber laser pump An optical system adapted to amplify an input signal includes an optical pump supporting the input signal and an optical pump beam. The optical pump includes an input port, a first active medium coupled to the input port, and a pump output coupled to the first activ... | 06/15/2010 |
| 7724423 | Optical fiber laser having improved efficiency A method and apparatus for improved efficiency in optical fiber lasers. The system increases the efficiency of cladding pumped optical fiber amplifiers through a seeding technique which includes pumping an erbium/ytterbium doped fiber amplifier with pump energy, dir... | 05/25/2010 |
| 7724424 | Optical module and optical amplification module An optical module for supplying pump light for amplifying to-be-amplified light includes an pump light source, optical coupling means, and an optical guide section. The optical guide section optically connects the pump light source and the optical coupling means, an... | 05/25/2010 |
| 7706055 | Optical module and processing method The present invention relates to an optical module which is capable of amplifying light to be amplified to high power and which has a structure for effectively reducing influences of damage to other optical parts, and heat generation. The optical module includes a f... | 04/27/2010 |
| 7667889 | Methods and systems for gain control in pulsed optical amplifiers A method of operating an amplifier system includes providing a pump signal at a pump wavelength. The pump signal is a function of a pump power. The method also includes providing an input signal at a signal wavelength and coupling the pump signal and the input signa... | 02/23/2010 |
| 7589889 | Transient optical power suppressing apparatus, method, and network An apparatus for suppressing optical power transients includes a variable optical attenuator receiving an input optical signal and outputting an output optical signal; an optical power sensing element coupled to the input optical signal and sensing a portion of the ... | 09/15/2009 |
| 7561325 | Optical module The present invention relates to an optical module that has a structure for protecting a pumping light source at a low cost. The optical module comprises an amplification optical fiber, an optical coupler, a pumping light source, a delay optical fiber, a seed light ... | 07/14/2009 |
| 7557987 | Device for receiving optical signals with a light guide A device for receiving optical signals comprising a light-guiding object having an irradiation surface for receiving optical signals adjacent to a propagation path along which light primarily travels within the light-guiding means. The light-guiding object is substa... | 07/07/2009 |
| 7515331 | Twin optical amplifier with dual pump power control An apparatus for amplifying optical communications systems is provided in which one or more amplifier modules, each containing an optical amplifier and at least two pump lasers, are optically isolated from a plurality of control modules. Each control module controls... | 04/07/2009 |
| 7483205 | Transient optical power suppressing apparatus, method, and network An apparatus for suppressing optical power transients includes a variable optical attenuator receiving an input optical signal and outputting an output optical signal; an optical power sensing element coupled to the input optical signal and sensing a portion of the ... | 01/27/2009 |
| 7440176 | Bi-directionally pumped optical fiber lasers and amplifiers An optical system including a gain material pumped by pump energy bands delivered to the gain material from different directions and separated sufficiently to prevent crosstalk between pump energy sources. Embodiments of the pump energy sources may be configured to ... | 10/21/2008 |
| 7440172 | Optical amplifier An doped fiber optical amplifier featuring an optical component having first wavelength division multiplexer, an isolator and a second wavelength division multiplexer is described. The isolator supports the propagation of optical signals within a predetermined signa... | 10/21/2008 |
| 7437070 | Submarine observation apparatus and submarine observation system In each of a plurality of submarine observation apparatus (1 to n), a branching unit (63) branches fixed-wavelength light (λ1) from an incoming wavelength-multiplexed light signal. An observation signal modulating unit (64) modulates the... | 10/14/2008 |
| 7437033 | Apparatus and method for pumping optical fiber An apparatus and method for pumping optical fibers. An optical element is disposed for directing pump energy into the inner cladding of a dual clad optical fiber, where the optical element has a refractive index greater than the refractive index of the inner claddin... | 10/14/2008 |
| 7436580 | Optical buffer employing four-wave mixing An optical buffer employing Bragg scattering (BS), in which two pump signals are combined with an input (data) signal in a four-wave mixing (FWM) medium to frequency convert the input signal into an idler signal, which is applied to a dispersive medium, in which the... | 10/14/2008 |
| 7408146 | Signal light transmitting apparatus, signal light transmitting system using the same, and signal light transmitting method A signal light transmitting apparatus from which signal light is led into a transmission optical fiber, the transmission optical fiber transmitting the led signal light, includes: a signal light power changer which changes power of signal light led thereto, the chan... | 08/05/2008 |
| 7403328 | Solar-pumped laser The present invention provides a solar-pumped active device which utilizes a holographic antenna grating on a solar energy silicon substrate to select specific diffracted wavelength and couple pump wavelength in an approximately vertical way and converge the pump wa... | 07/22/2008 |
| 7400807 | Apparatus and method for a waveguide with an index profile manifesting a central dip for better energy extraction A method and apparatus is described that use an index-of-refraction profile having a significant central dip in refractive index (or another tailored index profile) within the core of a gain fiber or a gain waveguide on a substrate. The benefits of this central dip ... | 07/15/2008 |
| 7400442 | Optical signal amplifier An optical signal amplifier includes a light source, a depolarizer, and a gain medium that transfers energy from a pump beam output from the depolarizer to the optical signal. The depolarizer may include one or more birefringent optical fibers which support two pola... | 07/15/2008 |
| 7391562 | Optical fiber amplifier and dispersion compensating fiber module for optical fiber amplifier The invention provides an optical fiber amplifier which assures stable operation of a pump light source and efficiently makes use of residual pump power to achieve improvement in conversion efficiency. The optical fiber amplifier includes a rare earth doped fiber. P... | 06/24/2008 |
| 7388711 | 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... | 06/17/2008 |
| 7385753 | Hybrid optical amplifier using gain-clamped semiconductor optical amplifier enabling raman amplification Provided is a hybrid optical amplifier using a gain-clamped semiconductor optical amplifier enabling Raman amplification. The hybrid optical amplifier comprises a spool of optical fiber used as transmission line in the optical communication, a GCSOA amplifying optic... | 06/10/2008 |
| 7379233 | Raman amplifier utilizing pump modulation for expanding gain band width A plurality of pump light sources generate plural variations of pump light having different frequencies. A modulation circuit intensity-modulates the plural variations of pump light in the predetermined periods, respectively. A pump light pair whose frequency differ... | 05/27/2008 |
| 7379234 | Quality monitoring of an optical fiber amplifier A method is described for detecting aging effects in components of an optical fiber amplifier wherein a broadband signal is amplified by means of a pump source in conjunction with at least one amplifying fiber. Input and output powers or, as the case may be, photon ... | 05/27/2008 |
| 7379236 | Optical fiber communication system using remote pumping An optical fiber communication system is provided which uses remote pumping that is capable of improving pumping efficiency and reducing a noise figure. A coupler (20) of a linear repeater (18) couples signal light to pumping light outputted from a pum... | 05/27/2008 |
| 7369731 | Optical fiber for amplification, optical amplifying apparatus, light source apparatus, photo-therapy apparatus, and exposure apparatus The present invention relates to an optical fiber for amplification, an optical amplifying apparatus, and so on, having a structure for enabling increase of power of output light, suppression of occurrence of nonlinear optical phenomena, and compact storage all toge... | 05/06/2008 |
| 7366416 | Hub for a passive optical network hub A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the transmission fiber for imparting gain to the information-bearing opt... | 04/29/2008 |
| 7362497 | Optical fibre This invention relates to optical fibres, fibre lasers, fibre laser arrays and sensor systems comprising fibre laser arrays. Conventional fibre laser sensor arrangements comprise a plurality of fibre lasers arranged in series along a length of optical fibre. A pump ... | 04/22/2008 |
| 7362496 | Fiber gain medium and method of coupling pump energy into the same A fiber gain medium assembly is provided. The fiber gain medium assembly includes a fiber gain medium, which in turn, includes a longitudinally extending inner core. The fiber gain medium also includes a cladding layer and a photo-emitting conductive polymer, both o... | 04/22/2008 |
| 7362498 | Method and apparatus for controlling a semiconductor optical amplifier for use in a passive optical network An optical amplifier including: an amplifier having an input port and an output port, which is disposed along a main signal line of the optical amplifier; a dummy laser generation circuit having an output coupled to the main signal line and operative for inputting a... | 04/22/2008 |
