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"That the automobile has practically reached the limit of its development is suggested by the fact that during the past year no improvements of a radical nature have been introduced."
Scientific American ; Jan. 2 edition, 1909
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| Number | Title | Issue Date |
| 6721481 | Distributed optical fiber amplifier using fiber with specific characteristic values An optical fiber transmission line including first, second and third optical fibers connected together so that light travels through the transmission line from the first optical fiber, then through the second optical fiber and then through the third optical fiber. T... | 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 |
| 6697558 | Raman amplified optical system with reduction of four-wave mixing effects A transmission fiber for use in a Raman amplified optical communication system is formed to exhibit certain characteristics that limit modulation instability and four-wave mixing in the amplification region, thus reducing the noise component present in th... | 02/24/2004 |
| 6694080 | Apparatus and method for thermally tuning an optical amplifier An apparatus and method for thermally tuning an optical amplifier comprises an optical waveguide doped with a fluorescent material, a thermal device for either heating or cooling the optical waveguide, and a pump light for exciting the fluorescent materia... | 02/17/2004 |
| 6687048 | Polarization and wavelength stable superflourescent sources The instability of the mean wavelength of a superfluorescent fiber source (SFS) is reduced by randomizing the polarization of light from a pump source or by using polarization maintaining components. In one embodiment, the polarization of a pump source is... | 02/03/2004 |
| 6687047 | Shared forward pumping in optical communications network A pump assembly for an optical amplifier includes a plurality of pump radiation sources, each pump radiation source producing radiation at a respective one of a first number of pump wavelengths. A coupler is optically coupled to each of the plurality of p... | 02/03/2004 |
| 6687046 | Optical fiber amplifier device and communications system using the optical fiber amplifier device The invention relates to an optical fiber amplifier device with an optical signal input and output with first piece of amplifying fiber doped with lanthanide in a double-clad structure, a second piece of amplifying fiber doped with lanthanide in a ring st... | 02/03/2004 |
| 6683892 | Laser device, method of producing the same and composite optical medium for use in producing the same In a longitudinal flexible composite optical medium (3) for use in a laser device, the longitudinal flexible composite optical medium includes a laser beam guide portion (1) containing a laser active material (11) and an excitation beam guide portion (2) ... | 01/27/2004 |
| 6678087 | Optical amplifier and optical fiber communication system using the amplifier An optical amplifier is implemented which can reduce its size and cost by using a smaller number of components. Signal light coupled by an optical combiner with pump light fed from a pumping light source is incident on an EDF (erbium-doped fiber) to be pu... | 01/13/2004 |
| 6671431 | Optical transmission device and optical transmission system employing the same An optical transmission device which reduces optical noise in an optical transmission system. The optical transmission device includes a core light amplifying unit and a first buffer light amplifying unit for amplifying a first signal light from a first t... | 12/30/2003 |
| 6661819 | Fiber grating stabilized diode laser A fiber Bragg grating is used to stabilize the intensity and frequency fluctuations of a diode laser. The diode laser is connected with an opto-mechanical apparatus to the fiber which contains the grating. The grating is formed in the guided-mode region o... | 12/09/2003 |
| 6660990 | Optical amplification and receiving system and method Optical receiving methods and systems are disclosed. One such optical receiving system includes an optical amplifier operable to produce amplified optical signals satisfying a filterless detection specification limit, and an optical detector locatable in ... | 12/09/2003 |
| 6661947 | Optical transmitting apparatus and optical repeating apparatus In an optical amplifying technique using remote pumping, an optical transmitting apparatus and an optical repeating apparatus are provided. An optical repeating apparatus comprises a first optical transmitting unit, a first loopback unit, a second optical... | 12/09/2003 |
| 6661957 | Diffusion barriers for holey fibers A diffusion barrier attached to the cladding layer prevents significant diffusion of a Raman active gas out of the holes in a holey fiber or photonic band gap fiber.... | 12/09/2003 |
| 6658189 | Broadband amplified spontaneous emission light source A broadband ASE light source is provided which comprises an amplifying optical fiber doped with rare earth; a pumping light source and an output port both which are connected to one end of the amplifying optical fiber via a multiplexer; and a reflecting o... | 12/02/2003 |
| 6657785 | Bi-directional circulator The present invention relates to bi-directional circulators based on interleaver technology, e.g. birefringent crystal interleaver technology, that enables signals containing even number ITU channels to travel in one direction through the device, while si... | 12/02/2003 |
| 6657777 | Interleaved lumped raman amplifier structure based on highly nonlinear fibers for densely spaced WDM channels A modular interleaved Raman amplifier structure is exploited to reap the advantages provided by the high Raman gain coefficient and small effective area of highly nonlinear fibers without incurring penalties caused by nonlinear effects and double-Rayleigh... | 12/02/2003 |
| 6654513 | Path monitoring in optical communication systems An optical communication line having optical fiber amplifiers including a pump laser can be configured to suppress the transmission of optical signals by reducing the power of the pump laser. In order that the portion of the line downstream of the amplifi... | 11/25/2003 |
| 6640040 | Compact cladding-pumped planar waveguide amplifier and fabrication method A low-cost, high performance cladding-pumped planar waveguide amplifier and fabrication method, for deployment in metro and access networks. The waveguide amplifier has a compact monolithic slab architecture preferably formed by first sandwich bonding an ... | 10/28/2003 |
| 6636345 | Optical fiber pumping system The optical fiber pumping system includes a connector that is adapted to selectively communicate with an external pump system. The connector communicates with an onboard pump multiplexer which also receives input from an on-board pump via a connector. The... | 10/21/2003 |
| 6628883 | Silica glass composition with lasing properties, an optical waveguide and a method of amplifying optical signals A thulium doped silica based glass capable of supporting lasing activity including Tm3+ as a lasing species disposed in a host composition, including oxides of germanium, silicon and tantalum. The preferred concentration of silicon in the host ... | 09/30/2003 |
| 6628853 | Optical amplifiers An optical amplifier is constituted by a planar waveguide having an optical core intersected by a transverse trench occupied by a polymeric optically amplifying medium. An optical pump for the amplifier is provided by a laser diode positioned to direct it... | 09/30/2003 |
| 6625354 | Fiber amplifier having a prism for efficient coupling of pump energy An optical fiber amplifier employing a prism to optimally couple pump energy into the pump core of a dual clad fiber. The optical fiber amplifier consists of a dual clad fiber having an inner (e.g., signal) core, an outer (e.g., pump) core surrounding the... | 09/23/2003 |
| 6625363 | Cladding-pumped optical fiber Optical apparatus including a cladding-pumped optical fiber that includes a core that includes an active material, a multimode inner cladding disposed about the core, and a second cladding disposed about the multimode inner cladding. The cladding-pumped o... | 09/23/2003 |
| 6620748 | Light-amplifying glass, light-amplifying medium and resin-coated light-amplifying medium An optical amplifying glass comprising a matrix glass and, added thereto, from 0.01 to 10 wt % of Er, characterized in that said matrix glass substantially comprises, as represented by mol %, 20 to 80 of Bi2 O3, 0 to 74.89 of B2... | 09/16/2003 |
| 6621624 | Optical gain fibers Disclosed are optical gain fibers which include an erbium-containing core and a cladding surrounding the core and which have ripple of less than about 25% over about a 40 nm wide window or ripple of less than about 15% over about a 32 nm wide window, or b... | 09/16/2003 |
| 6621623 | Optical fiber amplifying device stabilized for temperature and signal level An optical fiber amplifying apparatus is provided with an optical fiber for amplifying input signal lights, a heating/cooling element for heating or cooling the optical fiber, and a temperature control circuit for controlling the element. The circuit effe... | 09/16/2003 |
| 6614510 | Multi-function optical system An optical system is formed of a plurality of optical sources and components of different laser-based equipment systems. The sources and/or components may be combined and/or eliminated to reduce complexity, cost and/or overall weight of the system by cons... | 09/02/2003 |
| 6614815 | Blue laser based on interactions in fiber An approach to blue light in a single, integrated system is disclosed. An oscillator generates source radiation at a wavelength near 0.91 microns and a few milliwatts of power. This power is amplified to multi-Watt levels in a Neodymium-doped cladding-pum... | 09/02/2003 |
| 6611372 | Erbium and ytterbium co-doped phosphate glass optical fiber amplifiers using short active fiber length An optical fiber amplifier utilizing a phosphate glass optical fiber highly doped with rare-earth ions such as erbium to exhibit high gain per unit length, enabling the use of short fiber strands to achieve the needed gain in practical fiber optical commu... | 08/26/2003 |
| 6603905 | Launch port for pumping fiber lasers and amplifiers A method and apparatus is disclosed for coupling substantial optical power into an optical fiber from the side without encumbering ends of the fiber. A special optical fiber having a gain medium preferably including rare earth dopants in the core is provi... | 08/05/2003 |
| 6597495 | Four wave mixing reduction in raman amplifiers An improved method is provided for reducing four-wave mixing induced degradation in an optical data signal traversing an optical transport network that uses Raman amplifiers. The method includes: introducing at least two Raman amplifiers into the optical ... | 07/22/2003 |
| 6597494 | Polarization maintaining optical fiber amplifier and optical amplifier An optical fiber amplifier having improved gain and reduced noise, and an optical amplifier which restrains an unnecessary polarization component in the signal output light, maintains polarization of a signal light and performs optical amplification in wh... | 07/22/2003 |
| 6590698 | Ultraviolet laser apparatus and exposure apparatus using same An ultraviolet laser apparatus has a laser generating single-wavelength light between infrared and visible, a fiber optical amplifier for amplifying the laser light, and a converting portion converting the amplified laser light into single-wavelength ultr... | 07/08/2003 |
| 6587606 | Waveguide fiber dispersion compensating regenerator Disclosed is a dispersion compensating optical regenerator that provides for enhanced performance of telecommunication systems employing varying-soliton signal propagation and dispersion compensation. Allowing the solitons to change in amplitude, width an... | 07/01/2003 |
| 6577789 | Double-pass optical amplifiers and optical network equipment Optical amplifiers and other optical network equipment for handling optical data signals in fiber-optic communications links are provided. Optical fiber that is pumped by laser diode pumps may be used to provide optical gain. A circulator may be used in a... | 06/10/2003 |
| 6574393 | Compact optical fiber amplifier module An optical fiber amplifier module is disclosed which comprises a signal path locatee between a signal input and a signal output. A WDM coupler and an amplifying gain medium are disposed along the signal path. A pump laser is disposed out of the signal pat... | 06/03/2003 |
| 6574038 | Optical transmission path having sections which overcompensate for dispersion occurring in the sections An optical communication system which includes a transmission path through which a light is transmitted to a specific point, such as to a receiver. The transmission path includes a plurality of sections so that the light travels through the sections to th... | 06/03/2003 |
| 6570702 | Antiguided fiber ribbon laser The invention is a ribbon of an optical material with a plurality of cores that run along its length. The plurality of cores includes lasing impurity doped cores in an alternating spaced arrangement with index-modifying impurity doped cores. The ribbon co... | 05/27/2003 |
| 6570703 | Optical amplifying apparatus, optical amplifying method, and optical communication system An optical amplifying apparatus of the present invention comprises a correction part for correcting a predetermined fixed value of an output optical level by a correction amount according to an optical power of amplified spontaneous emission (ASE). The co... | 05/27/2003 |
