Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 8144392 | Waveguide amplifier in a sputtered film of erbium-doped gallium lanthanum sulfide glass A waveguide amplifier, disposed on a substrate, composed of sputtered film of chalcogenide glass doped with Erbium is disclosed. The amplifier includes a substrate, a thick film of chalcogenide glass disposed on the substrate, a pumping device, and an optical combin... | 03/27/2012 |
| 7894129 | Laser device and optical amplifier Laser light emission across a wide bandwidth emission spectrum is enabled in a laser amplifier equipped with solid gain media. The laser amplifier is equipped with: a resonator; a plurality of solid gain media, having fluorescent spectra that a least partially overl... | 02/22/2011 |
| 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 |
| 7289015 | Method for efficiently querying and identifying multiple items on a communication channel A method for identifying objects using an interrogation device on a communication channel is disclosed. Each object has an identification number in the form of a plurality of digits and has the ability to communicate to the interrogating device at least two differen... | 10/30/2007 |
| 7262144 | Photostructurable body and process for treating a glass and/or a glass-ceramic The invention relates to a photostructurable body, in particular glass or glass-ceramic, in which the glass is a multicomponent glass and/or the glass-ceramic is a multicomponent glass-ceramic, in each case having a positive change in refractive index Δn as a resul... | 08/28/2007 |
| 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 |
| 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 |
| 7194209 | Interference resistant infrared extension system An interference resistant infrared receiver and extension system is disclosed. A receiver in accordance with the present invention comprises at least one infrared photodetector configured to detect impinging infrared light of a desired wavelength, an amplifier, coup... | 03/20/2007 |
| 7116472 | Rare-earth-doped optical fiber having core co-doped with fluorine A rare-earth-doped optical fiber comprises a silica core region doped with a rare earth element and a cladding region adjacent the core region, characterized in that the core region is also doped with aluminum (Al) and fluorine (F). The presence of small amounts of ... | 10/03/2006 |
| 7079738 | Method for manufacturing a glass doped with a rare earth element and fiber for optical amplification using the same An optical fiber for optical amplification, characterized in that a full width at half maximum of gain spectrum is 45 nm or more; and a maximum value of power conversion efficiency is 80% or more. A method for producing a rare earth element-doped glass for use in ma... | 07/18/2006 |
| 7005669 | Quantum dots, nanocomposite materials with quantum dots, devices with quantum dots, and related fabrication methods The invention provides “engineered” nonlinear nanocomposite materials with an extremely large χ(3) and fast temporal response along with optical properties that can be precisely tuned to satisfy the requirements of a particular application (e.g., opt... | 02/28/2006 |
| 6972896 | Method of amplifying optical signals using doped materials with extremely broad bandwidths In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g., erbium-doped Bi4Ge3O12 material). The optical... | 12/06/2005 |
| 6970624 | Cladding pumped optical fiber gain devices The specification describes optical fiber gain devices, such as lasers and amplifiers, wherein losses due to a large step transition between an input section and a gain section are reduced by inserting an adiabatic transformer between the input section and the gain ... | 11/29/2005 |
| 6954305 | Optical amplifier and optical transmission system using it An optical amplifier 1 is constructed using an amplification optical waveguide in which a first amplification optical fiber 10 and a second amplification optical fiber 20 are connected in series. A P/Al-codoped EDF 10 excellent in noise c... | 10/11/2005 |
| 6927898 | Ultra-wide bandwidth optical amplifier A broadband optical amplifier is disclosed. The amplifier includes an input having a plurality of optical wavelengths, including optical wavelengths between 1610 and 1620 nanometers, and a first optical splitter optically connected to the input. The first optical sp... | 08/09/2005 |
| 6906855 | Method of amplifying optical signals using doped materials with extremely broad bandwidths In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g., erbium-doped SrY4(SiO4)3O material). The opti... | 06/14/2005 |
| 6847769 | Optical fiber amplifier An optical amplifier comprises a doped fiber core and a cladding layer surrounding the core. The mode field diameter of the fiber is greater than 8 μm and the refractive index difference between the core and the cladding layer is selected such that the cut-off wave... | 01/25/2005 |
| 6822994 | Solid-state laser using ytterbium-YAG composite medium A laser device employs a laser slab having an ionic layer and a nonionic layer, joined through an optical-quality interface. The laser slab has a trapezoidal cross-section in a direction perpendicular to the optical-quality interface. Thermal conductivity away from ... | 11/23/2004 |
| 6821917 | Tellurite glass and applications thereof A tellurite glass material has a composition of Li2O:TiO2:TeO2, and contains a dopant comprising ions of a rare earth metal. The rare earth ions can be thulium ions, Tm3+, to provide a material offering optical gain at 147... | 11/23/2004 |
| 6797657 | Tm-doped fluorophosphate glasses for 14xx amplifiers and lasers A host material for Tm3+-doping is provided. The host material is a fluorophosphate glass having a non-zero concentration of Tm3+, cation elements that include at least an alkaline earth, phosphorus, and aluminum, and anion elements that includ... | 09/28/2004 |
| 6781750 | Method of amplifying optical signals using doped materials with extremely broad bandwidths In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g., erbium-doped yttrium aluminum oxide material). The optical input signals inclu... | 08/24/2004 |
| 6747789 | Laser amplifying system In order to improve a laser amplifying system, comprising a solid-state member which has flat sides located opposite one another, is of a plate-like design and comprises a laser-active medium, a laser radiation field passing through the solid-state member, a pumping... | 06/08/2004 |
| 6721093 | Method of amplifying optical signals using doped materials with extremely broad bandwidths In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g., erbium-doped yttrium aluminum oxide material). The optical input signals inclu... | 04/13/2004 |
| 6700697 | Reflective erbium-doped amplifier The meters of coiled silica fiber in conventional R-EDFAs is replaced with an ultra-short high-gain waveguides formed of co-doped erbium-ytterbium multi-component glass a few centimeters in length. The compact R-EDA is pumped using non-conventional multi-... | 03/02/2004 |
| 6667257 | Heavy metal modified silica glass fibers doped with thulium, holmium, and thulium-sensitized-holmium high quantum efficiencies A modified silica glass composition for providing a reduction in the multiphonon quenching for a rare-earth dopant comprising: SiO2 in a host material; a rare-earth dopant; a first SiO2 modifier; and a second SiO2 mo... | 12/23/2003 |
| 6656859 | Tellurite glasses and optical components A family of tellurite glasses and optical components for telecommunication systems, the glasses consisting essentially of, as calculated in cation percent, 65-97% TeO2, and at least one additional oxide of an element having a valence greater th... | 12/02/2003 |
| 6653251 | Optical amplifying glass and method for its production An optical amplifying glass having Er doped in an amount of from 0.01 to 10% as represented by mass percentage to a matrix glass comprising, by mol %, BiO2 : 20 to 80, B2 O3 +SiO2 : 5 to 75, Ga2 O | 11/25/2003 |
| 6632757 | Transparent forsterite glass-ceramics A glass-ceramic which is substantially and desirably totally transparent, and which contains a predominant crystal phase of forsterite. The glass-ceramic is formed from precursor glasses having the following compositions, in weight percent on an oxide bas... | 10/14/2003 |
| 6603598 | Optical amplifying unit and optical transmission system An optical amplifying unit includes an input for the input optical signals and an output for the output of the optical signals. A single-mode active fiber codoped with Er and Yb is optically connected to the input and the output and adapted to amplify the... | 08/05/2003 |
| 6599853 | Optical amplifier glass An optical amplifier glass comprising a matrix glass containing Bi2 O3 and at least one of Al2 O3 and Ga2 O3, and Er doped to the matrix glass, wherein from 0.01 to 10% by mass percentage of ... | 07/29/2003 |
| 6597496 | Silicon nanoparticle stimulated emission devices The invention concerns elemental silicon emission devices. Devices according to the invention use elemental silicon nanoparticles as a material from which stimulated emissions are produced. Silicon nanoparticles efficiently produce emissions and act as a ... | 07/22/2003 |
| 6589895 | Thulium-doped germanate glass composition and device for optical amplification A Tm-doped germanate glass composition comprises GeO2 having a concentration of at least 20 mole percent, Tm2 O3 having a concentration of about 0.001 mole percent to about 2 mole percent, and Ga2 O3,... | 07/08/2003 |
| 6560009 | Erbium doped fibers for extended L-band amplification The specification describes rare earth doped fiber amplifier devices for operation in the extended L-band, i.e. at wavelengths from 1565 nm to above 1610 nm. High efficiency and flat gain spectra are obtained using a high silica based fiber codoped with E... | 05/06/2003 |
| 6549330 | Optical gain fiber doped with rare earth ions An optical gain fiber of the present invention is doped with rare earth ions for improving a gain efficiency of a certain transition of the rare earth ions by inhibiting an undesirable amplified spontaneous emission. The optical gain fiber for amplifying ... | 04/15/2003 |
| 6538806 | Optical fiber for optical amplifier and fiber optic amplifier An optical fiber is for optical amplification used for 1.58 μm band signal light amplification, at least a core region thereof being doped with Er. At least a part of the core region is made of silica glass co-doped with Ge and Al together with Er. The E... | 03/25/2003 |
| 6519078 | Raman amplifier The object of this invention is to improve SNR in the Raman amplification. An optical fiber (10) consists of a dispersion shift fiber in which a zero dispersion wavelength is shifted to the 1.55 μm band, and an optical fiber (12) consists of a single mod... | 02/11/2003 |
| 6515795 | Borosilicate cladding glasses for germanate core thulium-doped amplifiers A borosilicate glass composition comprises SiO2 having a concentration of about 40 mole percent to about 60 mole percent, B2 O3 having a concentration of about 10 mole percent to about 30 mole percent, and an alkaline eart... | 02/04/2003 |
| 6512630 | Miniature laser/amplifier system Many longitudinally pumped miniature lasers (single-frequency Nd:YAG microchip lasers and Q-switched microchip lasers) are sufficiently short that only a small fraction of the incident pump light is absorbed as it passes through the gain medium. The effic... | 01/28/2003 |
| 6504645 | Chalcogenide glass based Raman optical amplifier An optical amplifier includes a chalcogenide glass optical waveguide having optical input and output ports, coupled to the chalcogenide glass optical waveguide, a pump optical waveguide, and a wavelength-tunable pump laser. The pump optical waveguide coup... | 01/07/2003 |
| 6490081 | Method of amplifying optical signals using doped materials with extremely broad bandwidths In a method of amplifying optical input signals over a wide bandwidth, the optical input signals are applied to an optical waveguide made from a rare-earth-doped amorphous material (e.g., erbium-doped yttrium aluminum oxide material). The optical input si... | 12/03/2002 |
