Patents Represented by Attorney, Agent or Law Firm Eugen E. Pacher
  • Patent number: 6467312
    Abstract: The disclosed method of making microstructured optical fiber comprises providing a mold, with a multiplicity of elongate elements extending into the mold and being maintained in a predetermined spatial arrangement with respect to the mold. Silica-containing sol is introduced into the mold and is caused to or permitted to gel, such that a gel body results. After removing the elongate elements from the gel body and removing the gel body from the mold, the gel body is dried, sintered and purified, and the microstructured fiber is drawn from the sintered body.
    Type: Grant
    Filed: July 11, 2000
    Date of Patent: October 22, 2002
    Assignee: Fitel USA Corp.
    Inventors: Yoram De Hazan, John Burnette MacChesney, Thomas Edward Stockert, Dennis J Trevor, Robert Scott Windeler
  • Patent number: 6422043
    Abstract: Our method of making high bandwidth silica-based multimode optical fiber comprises provision of a non-circular preform, and drawing fiber of chiral structure from the preform. The non-circular preform can be made by maintaining the inside of the tubular preform under reduced pressure during at least part of the collapse, resulting in a non-circular core and cladding. It can also be made by removal (e.g., by grinding or plasma etching) of appropriate portions of the preform, resulting in a circular core and non-circular cladding. In the latter case, fiber is drawn at a relatively high temperature such that, due to surface tension, the cladding assumes substantially circular shape and the core assumes a non-circular shape. The chiral structure is imposed on the fiber in any appropriate way, e.g., by twisting during fiber drawing the fiber alternately in clockwise and couterclockwise sense relative to the preform.
    Type: Grant
    Filed: November 16, 1999
    Date of Patent: July 23, 2002
    Assignee: Fitel USA Corp.
    Inventors: David John DiGiovanni, Steven Eugene Golowich, Sean L. Jones, William Alfred Reed
  • Patent number: 6400865
    Abstract: Disclosed is an article that comprises an optical waveguide mode converter for converting light of wavelength &lgr; in a few-moded optical waveguide from a given guided mode (e.g., LP01,f) to another guided mode (e.g., LP02,b). The converter comprises a tilted refractive index grating in the core of the waveguide. Appropriate choice of the refractive index profile n(r), photosensitivity p(r) and tilt angle &thgr; makes possible substantial nulling of the coupling between some guided modes (e.g., LP01,f to LP01,b and LP01,f to LP11,b), and substantial maximization of the coupling between other guided modes (e.g., LP01,f to LP02,b). Mode converters according to the invention can be advantageously used in optical fiber communication systems in add/drop multiplexers.
    Type: Grant
    Filed: May 31, 2000
    Date of Patent: June 4, 2002
    Assignee: Fitel USA Corp.
    Inventors: Thomas Andrew Strasser, Paul Stephen Westbrook
  • Patent number: 6384804
    Abstract: A display apparatus according to our invention comprises a multiplicity of nominally identical smart pixels, a given pixel comprising an organic light emitting diode and an organic or inorganic (e.g., amorphous or polycrystalline Si) pixel FET. The display also comprises drive/compensation circuitry adapted for mitigating or eliminating non-idealities associated with the organic components. Among the non-idealities are variations in mobility and/or threshold voltage of the pixel FET from transistor to transistor, change in mobility and/or threshold voltage with time in a given pixel FET, change over time of the LED characteristics, capacitive signal feed-through through the gate insulator of the pixel FETs by short rise/fall time pulses, poor on-off ratio of the pixel FET, and charge leakage through the gate dielectric. Exemplary drive/compensation circuitry is disclosed.
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: May 7, 2002
    Assignee: Lucent Techonologies Inc.
    Inventors: Ananth Dodabalapur, Rahul Sarpeshkar
  • Patent number: 6291402
    Abstract: Some mechanical, electrical, and thermal properties of high Tc superconductors such as (Ba, Y) cuprates can be substantially improved by the dispersal of an appropriate metal in the superconductive body. For instance, mixing Ag particles with superconductive powder of nominal composition Ba2YCu3O7 and processing the mixture in the conventional manner can produce superconductive bodies having Tc of about 93 K and substantially greater fracture strength and normal state electrical and thermal conductivity than otherwise identical bodies that do not contain Ag particles.
    Type: Grant
    Filed: October 23, 1989
    Date of Patent: September 18, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Sungho Jin, Richard Curry Sherwood, Thomas Henry Tiefel, Robert Bruce van Dover
  • Patent number: 6271069
    Abstract: Disclosed are a method of making GaAs-based enhancement-type MOS-FETs, and articles (e.g., GaAs-based ICs) that comprise such a MOS-FET. The MOS-FETs are planar devices, without etched recess or epitaxial re-growth, with gate oxide that is primarily Ga2O3, and with low midgap interface state density (e.g., at most 1×1011 cm−2 eV−1 at 20° C.). The method involves ion implantation, implant activation in an As-containing atmosphere, surface reconstruction, and in situ deposition of the gate oxide. In preferred embodiments, no processing step subsequent to gate oxide formation is carried out above 300° C. in air, or above about 700° C. in UHV. The method makes possible fabrication of planar enhancement-type MOS-FETs having excellent characteristics, and also makes possible fabrication of complementary MOS-FETs, as well as ICs comprising MOS-FETs and MES-FETs.
    Type: Grant
    Filed: July 24, 1998
    Date of Patent: August 7, 2001
    Assignee: Agere Systems Guardian Corp.
    Inventors: Young-Kai Chen, Alfred Yi Cho, William Scott Hobson, Minghwei Hong, Jenn-Ming Kuo, Jueinai Raynien Kwo, Donald Winslow Murphy, Fan Ren
  • Patent number: 6208792
    Abstract: Waveguides according to this invention have a chalcogenide glass core that comprises Se and one or both of As and Ge, and further comprises one or more dopant elements selected from the elements that cause a change in optical energy gap Eg of the glass core. The amount of dopant is selected such that Eg is equal to or less than a 2-photon energy 2h&ngr;, where h is Planck's constant and &ngr;=c/&lgr;, where c is the speed of light in vacuum and &lgr; is an operating wavelength. The dopant elements furthermore are selected such that the chalcogenide glass core has a nonlinear refractive index n2 greater than 200n2 (SiO2), where n2 (SiO2) is the nonlinear index of silica at &lgr;. Typically, &lgr; is about 1.55 &mgr;m. Exemplary, the dopant elements are selected from Sb, Bi, Sn, Pb, In, Tl, Cu, Ag and S. Currently preferred dopants are Te, Sb, Tl, Cu and Ag.
    Type: Grant
    Filed: September 20, 1999
    Date of Patent: March 27, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Harold Yoonsung Hwang, Gadi Lenz, Malcolm Ellis Lines, Richart Elliott Slusher
  • Patent number: 6201916
    Abstract: In an optical fiber communication system a pulse reshaper can transform a distorted input light pulse into a reshaped output light pulse. The disclosed pulse reshaper is an all-optical pulse reshaper that comprises an optical waveguide having an effective length, the waveguide connecting the input and the output and comprising optical non-linear material, with a periodic variation of an effective refractive index of the optical waveguide. The optically non-linear material and the periodic variation are selected such that the reshaped output light pulse is a substantially transform-limited output light pulse.
    Type: Grant
    Filed: March 15, 1999
    Date of Patent: March 13, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Benjamin John Eggleton, Gadi Lenz, Richart Elliott Slusher, Stefan Heinz Spalter
  • Patent number: 6197375
    Abstract: Many potential applications of CVD diamond film require the ability to remove a predetermined quantity of material from a surface of the film. We have discovered that such removal is advantageously accomplished by contacting the surface of the polycrystalline diamond film with a metal selected from Fe, Ni, Mn and Ti (preferably Fe and Mn, most preferably Mn), and maintaining the metal-contacted diamond film at a temperature in the range 600-1100° C. (preferably 800-1000° C.) without relative lateral motion between the film and the metal, for an effective time for removal of the quantity of material, exemplarily less than 100 hours. The metal can be in any appropriate form, e.g., a deposited layer, (including a patterned layer), a foil, or powder. We have also discovered that the local thermal conductivity of CVD diamond films typically increases with distance from the lower surface of an as-grown film.
    Type: Grant
    Filed: July 21, 1994
    Date of Patent: March 6, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: John Edwin Graebner, Sungho Jin, Thomas Henry Tiefel
  • Patent number: 6163638
    Abstract: Optical pulse compression is of importance in very high bit rate optical fiber communication systems. We are disclosing an adiabatic optical pulse compressor that can achieve substantial compression by means of a relatively short (e.g., about 100 cm) chirped periodic structure, exemplarily an apodized and chirped fiber Bragg grating. The input pulse to the periodic structure typically are not soliton pulses, but the passage through the periodic structure results in transformation of the pulses into substantially transform-limited soliton pulses that are available (typically after appropriate modification) for transmission through conventional optical fiber towards utilization means. The input pulses can be generated by any applicable method, e.g., by combining the cw outputs of two lasers that differ with regard to the frequency of their output.
    Type: Grant
    Filed: October 29, 1998
    Date of Patent: December 19, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Benjamin John Eggleton, Gadi Lenz
  • Patent number: 6163552
    Abstract: A multi-wavelength Raman radiation source is disclosed. The source receives pump radiation at a given wavelength, e.g., 1100 nm, and has outputs at two or more longer wavelengths, e.g., 1450 nm and 1480 nm. The cascaded Raman resonator comprises, for each desired output wavelength, an optical cavity formed by a high reflectivity grating and a low reflectivity grating, with both having the same center wavelength, equal to the desired output wavelength. Multi-wavelength Raman radiation sources have a variety of applications, e.g., they can advantageously be used in a remotely pumped optical fiber communication system.
    Type: Grant
    Filed: August 14, 1998
    Date of Patent: December 19, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Jon W. Engelberth, Gloria R. Jacobovitz-Veselka
  • Patent number: 6137924
    Abstract: A dispersion compensating chirped optical fiber Bragg grating according to our invention is formed in polarization maintaining (PM) fiber having birefringence of at least 10.sup.-6, preferably 10.sup.-5 or more. Use of the PM fiber makes possible substantial cancellation of the polarization mode dispersion that typically is unavoidably present in chirped Bragg gratings for dispersion compensation.
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: October 24, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Thomas Andrew Strasser, Jefferson Lynn Wagener
  • Patent number: 6122935
    Abstract: Bubble-free core glass can be deposited at relatively high rate (e.g., >0.3 gm SiO.sub.2 /minute, preferably 0.6 gm SiO.sub.2 /minute or more) by MCVD if the deposition conditions are appropriately selected. For instance, a relatively high torch traverse speed, a relatively low sintering temperature, and/or relatively low gas flow rates can facilitate high rate deposition of bubble-free glass. By way of example, conditions are disclosed that yielded essentially bubble-free core glass (.DELTA.=0.35%) at a rate of 1 gm SiO.sub.2 /minute.
    Type: Grant
    Filed: July 8, 1998
    Date of Patent: September 26, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Paul Francis Glodis, Katherine Theresa Nelson, Kim Willard Womack, Man Fei Yan
  • Patent number: 6122422
    Abstract: A bidirectional waveguide tap is disclosed. The tap comprises an appropriately blazed grating in the waveguide, with coupling means in optical co-operation with the waveguide causing transfer of light from a guided mode in the waveguide to a radiation mode. Radiation mode light of a given wavelength and propagation direction is brought to a focus on a predetermined region of utilization means, e.g., an array of photosensors.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: September 19, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Christopher Stephen Koeppen, Jefferson Lynn Wagener
  • Patent number: 6114758
    Abstract: The disclosed superconducting multipole RF filter comprises a multiplicity of coupled circular disk resonators designed for operation in the TM 010 mode. The disk resonators are arranged in a co-axial stack, with a circular metal spacer sandwiched between any two neighboring disk resonators. Each metal spacer has a central through-aperture, with a conductive member disposed in the through-aperture and electrically connecting the two neighboring disk resonators that are sandwiching a given metal spacer. A disk resonator comprises two circular members, each circular member comprising a circular dielectric substrate, exemplarily a LaAlO.sub.3 wafer. Superconducting layers (typically YBCO) are disposed on each major surface of the substrate. The two members are joined together such that conductive layers (typically gold) electrically connect the two outside superconducting layers. The disclosed RF filter has good power handling capability, is compact, has good heat removal and relatively simple tuning.
    Type: Grant
    Filed: August 21, 1998
    Date of Patent: September 5, 2000
    Assignees: Lucent Technologies Inc., Massachusetts Inst. of Technology
    Inventors: Alfredo Carlos Anderson, Zhengxiang Ma, Paul Anthony Polakos, Hui Wu
  • Patent number: 6104733
    Abstract: We have found that the conversion efficiency of a Er/Yb-doped cladding pumped fiber amplifier increases with increasing signal input power. Thus, preamplification of the input signal by means of an Er-doped fiber amplifier can result in increased conversion efficiency of the cladding pumped power amplifier. Such increased efficiency is desirable, lessening heat removal problems and/or facilitating increased reliability.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: August 15, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Rolando Patricio Espindola, Isaac Ryazansky, Andrew John Stentz, Kenneth Lee Walker, Paul Francis Wysocki
  • Patent number: 6096263
    Abstract: A novel intermetallic superconductor with surprisingly high transition temperature is disclosed. The material comprises B and C, and can form a bulk superconductor. Exemplary of the novel superconductors is material of nominal composition YPd.sub.5 B.sub.3 C.sub.x, with x chosen such that the C:B ratio is in the range 0.05-2. An exemplary bulk sample of such composition has T, (onset) of 22.5 K, with more than 15 volume % of the sample being superconducting.
    Type: Grant
    Filed: December 10, 1993
    Date of Patent: August 1, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Robert Joseph Cava, James Joseph Krajewski
  • Patent number: 6081366
    Abstract: The disclosed optical fiber communication system comprises a remotely pumped erbium-doped fiber amplifier (EDFA). The pump radiation is de-tuned with respect to wavelength, the wavelength being selected longer than both the optimal wavelengths for pumping the EDFA and for producing Raman gain in the transmission fiber, respectively. Such de-tuning results in improved over-all system performance through reduced multi-path interference. Exemplarily, the pump radiation has wavelength in the range 1490-1510 nm.
    Type: Grant
    Filed: August 28, 1997
    Date of Patent: June 27, 2000
    Assignees: Lucent Technologies Inc., Tyco Submarine Systems, Ltd.
    Inventors: Howard David Kidorf, Kenneth Lee Walker
  • Patent number: 6074603
    Abstract: A novel intermetallic superconductor with surprisingly high transition temperature is disclosed. The material comprises B and C, and can form a bulk superconductor. Exemplary of the novel superconductors is material of nominal composition YPd.sub.5 B.sub.3 C.sub.x, with x chosen such that the C:B ratio is in the range 0.05-2. An exemplary bulk sample of such composition has T.sub.c (onset) of 22.5 K, with more than 15 volume % of the sample being superconducting.
    Type: Grant
    Filed: July 12, 1999
    Date of Patent: June 13, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Robert Joseph Cava, James Joseph Krajewski
  • Patent number: 6064681
    Abstract: In practical WDM systems, the maximum SMSR for each channel does not necessarily occur where dP.sub.out /dI.sub.tune =0. In fact, for most channels the maximum SMSR occurs at values of tuning current where this first derivative in not zero. In accordance with one aspect of the invention, a wavelength stabilized optical transmitter includes a DBR laser and a feedback loop for controlling the center wavelength of the laser, characterized in that the transmitter also includes a memory in which are stored the non-zero values of dP.sub.out /dI.sub.tune where the SMSR is a maximum for each of a multiplicity of different channel wavelengths and further includes a controller responsive to the stored values for delivering to the laser a level of tuning current that maximizes the SMSR for a particular channel wavelength.
    Type: Grant
    Filed: June 11, 1999
    Date of Patent: May 16, 2000
    Assignee: Lucent Technologies Inc.
    Inventor: David Alan Ackerman