Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 7588856 | Resistive-varying electrode structure An electrode structure for a low voltage, high current electrical production device includes a charge transfer member (612). An electrically conductive member (605) having a non-uniform resistance is disposed on the charge transfer member 612 fo... | 09/15/2009 |
| 7403689 | Active photonic band-gap optical fiber A plurality of active gain material (93) is disposed in an active interface portion (44) of a dielectric band-gap cladding confinement region (22) adjacent to a dielectric core (12) of a photonic band-gap crystal fiber (20), wherei... | 07/22/2008 |
| 7400797 | Transverse closed-loop resonator A transverse closed-loop fiber resonator (10) includes an inner cladding (102) having a surface (300) peripherally forming a closed-loop shape for confining light to the surface (300). The inner cladding has a first diameter thickness ( | 07/15/2008 |
| 7256879 | Semiconductor array tester An array tester (10) characterizes individual ones (111) of a semiconductor devices of an array (11) based on polarization-resolving an optical far-field measurement of the individual chips (111) as a function of angular position. Two pai... | 08/14/2007 |
| 7169213 | Multi-channel cross-flow porous device A multi-channel modular device (10) processes between two fluid streams of different compositions. The device (10) includes a porous body (150) having a first plurality of feed-flow pathways (110) disposed in the body (150) for tra... | 01/30/2007 |
| 7027735 | Unequal pulse spacer For suppressing intra-channel four wave mixing in a time division multiplexing (TDM) system, where N synchronous data streams, each having a reduced data pulse width within a bit slot timing interval, from parallel to serial form, are converted for optically bit int... | 04/11/2006 |
| 6987783 | Three-level air-clad rare-earth doped fiber laser/amplifier An optically-active air-clad fiber (30) includes a core (34, 84) that facilitates doping with an ion optically excitable and having a three-level optical transition when pumped at a first end (28) of an optical cavity (46) by a multimode ... | 01/17/2006 |
| 6982439 | Tunnel junctions for long-wavelength VCSELs A tunnel junction device (102) with minimal hydrogen passivation of acceptors includes a p-type tunnel junction layer (106) of a first semiconductor material doped with carbon. The first semiconductor material includes aluminum, gallium, arsenic and an... | 01/03/2006 |
| 6944192 | Planar laser An optical device (10) includes a broad area laser (72) for lasing at a first wavelength (64), a multimode active-doped tapered waveguide laser (6); and a multimode passive planar mode transformer (118) coupling and tapering from t... | 09/13/2005 |
| 6933539 | Tunnel junctions for long-wavelength VCSELs A tunnel junction device (102) with minimal hydrogen passivation of acceptors includes a p-type tunnel junction layer (106) of a first semiconductor material doped with carbon. The first semiconductor material includes aluminum, gallium, arsenic and an... | 08/23/2005 |
| 6891870 | Distributed feedback laser for isolator-free operation An integrated semiconductor device comprising a laser on a substrate, the laser having an active layer and a current-induced grating, such as a current-injection complex-coupled grating, within a laser cavity producing a single-mode output light signal at high data ... | 05/10/2005 |
| 6888860 | Low cost optical bench having high thermal conductivity The invention relates with an optical bench for optoelectronic packages comprising a rigid insulating substrate, the substrate having a top surface along which it is defined an optical axis, the substrate comprising: a device region for mounting at least an optoelec... | 05/03/2005 |
| 6862386 | Method of making a Mach-Zehnder interferometer, and related device A method of making an all-fiber Mach-Zehnder interferometer comprising at least two optical fibers comprises the steps of bringing the fibers in a reciprocal contact relationship for a contact section thereof; fusing together and tapering the fibers in at least a fi... | 03/01/2005 |
| 6842125 | Unipolar electrical to CSRZ optical converter A conversion method for converting a unipolar voltage data stream into a carrier-suppressed return-to-zero (CSRZ) optical data stream includes modulating a continuous optical wave with an encoded nonreturn-to-zero (NRZ) voltage data stream for providing a CSRZ optic... | 01/11/2005 |
| 6836607 | Cladding-pumped 3-level fiber laser/amplifier An optically active fiber (30) is disclosed for making a fiber laser (18) or an amplifier (16). This double-clad structured active fiber (30) has a core (34), doped with an optically excitable ion having a three-level transition. T... | 12/28/2004 |
| 6798550 | Spatial light modulator A modulator formed with a solid state electro-optic material having a pixellated structure interconnected to a circuit on a semiconductor substrate. Silicon CMOS integrated circuit that can include random access memories (RAMs) are used as a substrate and int... | 09/28/2004 |
| 6794631 | Three-terminal avalanche photodiode An avalanche photodiode (APD) includes an absorption layer above the multiplication layer, where the thickness of the multiplication layer is defined through a growth process. The APD can also have a third-terminal, or peripheral ring terminal, for collecting charge... | 09/21/2004 |
| 6768750 | Multi-spectral line Raman laser A multiple spectral line Raman laser having adjustable relative power output between different spectral lines is provided. The laser includes a lasing cavity, first and second reflectors optically coupled to a back end of the cavity that reflects substantially all l... | 07/27/2004 |
| 6766092 | Compensation of the refractive index of doped InP A mode transformer (10) includes a passive waveguide (120) having a first composition co-existing with a second composition to provide a guided optical wave (250). A p-doped re-growth layer (130) having the first composition is disposed o... | 07/20/2004 |
| 6751241 | Multimode fiber laser gratings An optically active waveguide laser (30) includes a multimode portion (126) for carrying more than one spatial mode at a predetermined wavelength chosen from a bandwidth including a pump wavelength (64) and the lasing wavelength (66). The... | 06/15/2004 |
| 6734755 | Broadband uniplanar coplanar transition A broadband interconnection device (10) used for interconnection between a first transmission line (100) and a second transmission line (200), has a substrate (300) with the first transmission line (100) defined at a first side ( | 05/11/2004 |
| 6721081 | Variable duty cycle optical pulses A device (16) in a system (10) modulates an optical signal (13) and tunes the duty cycle of the optical signal (13) for optimizing system performance as a response of the duty cycle. The device (16) includes a tunable duty-cycle Ma... | 04/13/2004 |
| 6718110 | Indiffused optical waveguide structures in a substrate The invention relates to a method of manufacturing an indiffused optical waveguide (6) in a substrate (1). A metal layer (7) and photoresist (8) are deposited on a substrate (1) in this order. Portions of the photoresist (8)... | 04/06/2004 |
| 6714345 | Semiconductor optical amplifier providing high gain, high power and low noise figure An optical signal amplifier includes a first semiconductor optical amplifier having an input for receiving an optical signal, and an output, wherein the optical signal is amplified by the first semiconductor optical amplifier resulting in an amplified optical signal... | 03/30/2004 |
| 6700654 | Automatic dark current compensation A monitoring system useful for monitoring the state of a fiber communication channel in which a portion of the fiber signal is tapped and detected by a photodiode. The dark current of the photodiode and other DC offsets of the system may be compensated by... | 03/02/2004 |
| 6700694 | Ferro-electric azimuth rotator An electrically controllable azimuth optical rotator (10) includes a first quarterwave plate (16) for receiving a first beam of electromagnetic energy (22) having a first arbitrary polarization state, and outputting a second beam (122) in response to the ... | 03/02/2004 |
| 6690685 | Method for producing a fiber laser To produce a fiber laser (106) a double-cladding active fiber (114) doped with Yb is predisposed to receive, near a first end (114a), a UV radiation suitable to write a first Bragg grating; during the writing process, a scanned pumping radiation is fed to... | 02/10/2004 |
| 6674773 | Multi-wavelength Raman laser A multi-wavelength Raman laser comprising a Raman fiber forming part of an optical ring, preferably most parts of which are formed by optical fiber. The ring includes a periodic filter selectively transmitting optical power at a number of equally spaced w... | 01/06/2004 |
| 6654105 | Cross-correlating PMD detector A polarization mode dispersion center (306) measures PMD impairment through the cross-correlation of optical pulses. A second variable phase retarder plate (504) is oriented with polarization eigenstates at preferably 45 degree angle with respect to those... | 11/25/2003 |
| 6650675 | Tunable laser device for avoiding optical mode hops An integrated semiconductor device comprising a wavelength-tunable laser, such as a distributed Bragg reflector (DBR) laser, where the laser has a gain section that includes an active layer, and a grating section that includes an active layer and a curren... | 11/18/2003 |
| 6643434 | Passive alignment using slanted wall pedestal An apparatus is provided including a first chip having a plurality of solder bumps and recesses formed therein at preselected locations. A second chip is provided with a plurality of solder pads and projections. A plurality of solder bonds are coupled bet... | 11/04/2003 |
| 6625182 | Semiconductor or solid-state laser having an external fiber cavity A semiconductor laser having an external cavity including a single-mode optical fiber. A Bragg grating is written onto the fiber which defines the end of the optical cavity, selects the lasing wavelength, and discriminates against the lasing of higher-ord... | 09/23/2003 |
| 6621961 | Self-alignment hybridization process and component A method of forming a hybrid optical component includes the steps of masking and etching a pattern on a core layer of a planar optical component to define at least one alignment element and an optical element and subsequently overcladding the optical elem... | 09/16/2003 |
| 6574399 | Ceramic waferboard for integration of optical/optoelectronic/electronic components An optoelectronic module includes a ceramic waferboard having a groove configured to passively position an optical fiber. The ceramic waferboard includes an alignment feature configured to passively position an optical component. An optical device is secu... | 06/03/2003 |
| 6567586 | Dual fiber collimator An optical fiber collimator (100) in an optical system, includes a pair of optical fibers (108) having emitting cleaved planes (112) to provide a substantially uniform angled side surface for forming a prescribed angle (101) relative to the optical axis (... | 05/20/2003 |
| 6563631 | Tunable gain-clamped semiconductor optical amplifier A gain-tunable semiconductor optical amplifier (10) includes an amplifying section (38) for amplifying an optical signal (422). A first tunable reflector section (51) and a second tunable reflector section (52) are integrated on opposed sides of the ampli... | 05/13/2003 |
| 6551650 | Dip formation of flip-chip solder bumps A process for fabricating a solder bump (113) includes providing an inorganic de-wetting substrate (102). In order to form a composite substrate (20), having the desired wetting/dewetting composition, a wetting metal is first applied on the inorganic de-w... | 04/22/2003 |
| 6545798 | Thermal ripple-compensating, gain-flattening filter for an optical amplifier An optical device including an optical amplifier to amplify optical signals received through an optical input, and to supply the amplified optical signals from an optical output, and an optical filter component to compensate for variations in the gain spe... | 04/08/2003 |
| 6535656 | Planar-type polarization independent optical isolator A planar-type optical isolator includes a substrate, a first mode splitter, a second mode splitter and a phase shift region formed on the substrate between the first mode splitter and the second mode splitter. The first mode splitter is formed on the subs... | 03/18/2003 |
| 6522450 | Loss-less tunable per-channel dispersion compensator An apparatus and method of chromatic dispersion includes the negative compensation per channel filter (130) coupled to an optical receiving path (100) for providing a lossless discontinuous per-channel dispersion compensation in the optical receiving path... | 02/18/2003 |
