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| Number | Title | Issue Date |
| 7848014 | Erbium and Erbium/Ytterbium cladding pumped hybrid optical amplifier An optical fiber amplifier apparatus and optical signal amplification method are provided. In one example, the amplifier apparatus comprises an optical combiner that is configured to receive an input optical signal to be amplified and a pump light beam. The optical ... | 12/07/2010 |
| 7440171 | Staged amplifier for lower noise figure and higher saturation power An optical amplifier utilizes two or more doped fiber segments or portions to achieve a lower noise figure and a higher saturation power than would be possible using any one of the doped fiber segments. Each doped fiber portion may be considered to be a doped fiber ... | 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 |
| 7289740 | WDM regenerated transmission system A multichannel wavelength-division multiplex fiber optic transmission system includes an optical transmitter and an optical receiver connected by an optical line including at least one optical fiber and at least one set of channel regenerators. Successive regenerato... | 10/30/2007 |
| 7079313 | Optical amplifying apparatus which routes pumping light to a raman amplification medium and a rare-earth-doped optical amplification medium An optical amplifying apparatus has a plurality of pumping sources generating pumping light beams at different wavelengths, a Raman amplification medium receiving the pumping light beams from the pumping sources to amplify a main signal light beam by using stimulate... | 07/18/2006 |
| 7016593 | Optical waveguide[[s]] and optical fiber perform including gallium, lanthanum, sulfur, oxygen, and fluorine An optical waveguide includes a clad of clad glass and a core of core glass. The clad glass includes gallium, lanthanum, and sulfur. The clad glass may include gallium sulfide and lanthanum oxide. The clad glass may also include lanthanum fluoride. The core glass in... | 03/21/2006 |
| 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 |
| 6894828 | Power scalable waveguide amplifier and laser devices The present invention is directed to guided wave systems, beam transport and waveguide techniques. The invention may comprise passive or active, hollow and dielectric core self-imaging mode wave guide systems, beam amplifiers (10, 40), laser resonators (70... | 05/17/2005 |
| 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 |
| 6717721 | Large effective area erbium doped fiber optical amplifier An optical waveguide amplifier fiber comprises a core region at least in part comprises Er2O3, Al2O3, GeO2 and Ga2O3. The amplifier fiber also comprises an inner clad surrounding the core r... | 04/06/2004 |
| 6519080 | Optical amplifier and optical transmission system An optical transmission system includes an optical transmitting unit (10) to transmit optical signals in a transmission wavelength band above 1570 nm; an optical receiving unit to receive the optical signals; an optical fiber link optically coupling the t... | 02/11/2003 |
| 6429964 | High power, multiple-tap co-doped optical amplifier A high power optical amplifier with a multiple-tap output includes a preamplifier stage (such as an EDFA), followed by a power amplifier comprises a concatenated set of co-doped optical amplifier stages. Each amplifier stage includes a tap/power extractor... | 08/06/2002 |
| 6077799 | SPCVD silicate glasses These glasses incorporate a combination of F and Al2 O3 to achieve even wider fluorescence and improved gain flatness. In addition, SPCVD incorporates large amounts of N into low-loss fiber whose high charge has an impact on rare ear... | 06/20/2000 |
| 5936762 | Doped optical waveguide amplifier The core of a low phonon energy glass optical fibre is doped with trivalent Dysprosium ions for application as an efficient optical fibre amplifier operating around 1.3 μm. The device utilises the transition 6 H9/2 -6 F | 08/10/1999 |
| 5748364 | Amplified telecommunication system for wavelength-division multiplexing transmissions The present invention relates to an optical amplifier and a telecommunication system including a plurality of the optical amplifiers connected in cascade, particularly adapted for a wavelength division multiplexing transmission, in which a combination of ... | 05/05/1998 |
| 5742427 | Optical fiber amplifier This invention relates to an optical fiber amplifier for amplifying and outputting input signal light. The optical fiber amplifier includes first to third amplification optical fibers. The first to third optical fibers are arranged such that the signal li... | 04/21/1998 |
| 5731892 | Article comprising hybrid optical fiber amplifier Multistage Er-doped fiber amplifiers (EDFAs) are disclosed. They comprise a first stage that comprises Er and Al, and further comprise a second stage that comprises Er and a further rare earth element, exemplary Yb. Such multistage EDFAs can have advantag... | 03/24/1998 |
| 5721635 | Optical fiber amplifier and optical amplifier repeater This method comprises the steps of: introducing light signals having different wavelengths into an optical amplifier, wherein the optical amplifier has a plurality of fibers with rare earth element doped therein and P is selectively doped in said fibers; ... | 02/24/1998 |
| 5640269 | Optical fiber amplifier and optical amplifier repeater An optical fiber amplifier comprises a composite optical fiber for receiving signal light and excitation light, amplifying the signal light and emitting the amplified signal light, comprising at least two kinds of optical fibers serially coupled each havi... | 06/17/1997 |
| 5546213 | Optical amplifier and optical communication system provided with the optical amplifier An optical communication system transmits information with a pumping light beam acting as the carrier, and with a signal light beam. This optical communication system includes an optical fiber amplifier adapted to amplify the signal light beam by having t... | 08/13/1996 |
| 5532870 | Optical fiber amplifier and optical amplifier repeater An optical fiber amplifier comprises a composite optical fiber for receiving signal light and excitation light, amplifying the signal light and emitting the amplified signal light, comprising at least two kinds of optical fibers serially coupled each havi... | 07/02/1996 |
| 5502591 | Optical amplifier with a doped fluoride glass of optical fibre and process for producing said amplifier Optical amplifier with a doped fluoride glass optical fibre and process for the production of said amplifier. In said amplifier, two monomode silica fibres (4a, 6a), whereof at least one is doped with erbium, are coupled to two ends of an erbium-doped, fl... | 03/26/1996 |
| 5491581 | Rare earth doped optical fibre amplifiers An optical amplifier which includes an optical fiber having an erbium doped core surrounded by cladding, a pump for pumping the fiber with pump light at a pump wavelength coupled to the fiber, input means for inputting a signal to be amplified to the ampl... | 02/13/1996 |
| 5490010 | Optical amplifier An optical amplifier having an amplification medium which comprises a complex of a rare earth ion and a ligand, said complex being dissolved in a polymeric matrix, as well as an optical communications network comprising one or more optical amplifiers of t... | 02/06/1996 |
| 5274734 | Article comprising a rare earth or transition metal doped optical fiber We have discovered that silica-based optical fibers that are doped with Ge, Al and a rare earth (e.g., Er) can be very susceptible to hydrogen-induced attenuation change. For instance, such fiber can exhibit loss increase rates that are, at 20° C., 10 | 12/28/1993 |
| 5111334 | Multi-stage fiber-optic amplifier A fiber-optic amplifier, whose light signal input and light signal output may be connected with a monomode fiber for 1536 nm light signals, is composed of two or more cascade connected amplifier stages including a fiber piece that amplifies light signals ... | 05/05/1992 |
| 5050949 | Multi-stage optical fiber amplifier In this invention there is disclosed a multi-stage optical fiber amplifier for providing a new functon, that of gain equalization. The disclosed multi-stage optical fiber amplifier comprises at least two stages of amplification where each stage comprises ... | 09/24/1991 |
