Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 5872883 | Curved optical waveguide and method of manufacturing the same The present invention provides a curved optical waveguide with reduced loss. Particularly, it relates to a waveguide with rectangular cross-section which has a curved portion, wherein the relation between the width D of the waveguide at the curved portion... | 02/16/1999 |
| 5862288 | Self-imaging waveguide devices for wavelength division multiplexing applications An out-of-phase self-imaging waveguide integrated optical wavelength demuplexer having an input waveguide containing light of two different wavelengths. The demultiplexer has a 1-by-2 self-imaging power splitter, a first intermediate waveguide containing... | 01/19/1999 |
| 5844236 | Multi-wavelength optical drive/sense readout for resonant microstructures A method of driving and sensing a resonant sensor network wherein a least a one resonant sensor is driven by a first light from a first light source at a first frequency, wherein said first light source is modulated by an a.c. source. A second light sourc... | 12/01/1998 |
| 5845022 | Double-chirped waveguide grating router with angled ports An improved waveguide grating router occupies less physical volume than prior-art designs, and provides a spectral response with substantially one dominant passband, by providing nonlinearly-changing angles between the central axis of a waveguide coupler ... | 12/01/1998 |
| 5841919 | Optical wavelength multiplexer/demultiplexer An optical wavelength multiplexer/demultiplexer has an input channel waveguide for receiving a wavelength division multiplexed signal, a first slab waveguide having an input boundary and a fan-shaped output boundary, an arrayed-waveguide grating comprisin... | 11/24/1998 |
| 5841918 | Wavelength and bandwidth tunable optical system A system for modifying an input optical signal by reducing its bandwidth and modifying its central wavelength has an optical circulator with at least three ports and at least two optical filters coupled to consecutive ports of the circulator. The first fi... | 11/24/1998 |
| 5841921 | Optical coupling device The present invention features a rectilinear optical coupler consisting of a single optical fiber terminating in an expanded, convex portion. An array of optical fibers consisting of a central optical fiber surrounded by six additional optical fibers has ... | 11/24/1998 |
| 5838853 | Optical waveguide An optical waveguide having stable low branching ratio is disclosed, which includes a primary optical waveguide portion coupled at a input end thereof to an input-side optical fiber. branched optical waveguide portions each having one end continuously con... | 11/17/1998 |
| 5838849 | Optical component wherein either an optical field distribution of received light or an optical field distribution of a propagation mode of a receiving waveguide has a double-hump shape An optical waveguide having a light receiving end and a propagation mode with a double-hump shaped optical field distribution at the light receiving end to receive light into the optical waveguide. The light incident on the light receiving end typically h... | 11/17/1998 |
| 5822475 | Optical bus and signal processor To improve resistance to environmental changes and enhance system extensibility, the present invention provides an optical bus for transmitting an optical signal, which has diffusers distributed in a optical transmission layer to diffuse an input signal b... | 10/13/1998 |
| 5822481 | Waveguide grating optical demultiplexer The demultiplexer has two couplers connected together by a grating of waveguides that are all of different lengths. To make a grating component of low order and that occupies little space, each waveguide has three adjacent segments having radii of curvatu... | 10/13/1998 |
| 5822474 | Optical branching apparatus and transmission line setting method therefor An optical branching apparatus for branching optical transmission lines as reverse and forward links through a plurality of ports includes a plurality of demultiplexing units, a plurality of multiplexing units, and a plurality of optical transmission medi... | 10/13/1998 |
| 5818991 | Optical coupling arrangement composed of a pair of strip-type optical waveguide end segments An optical coupling arrangement consist of a pair of strip-type optical waveguide end segments extending alongside one another and having ends arranged at a small distance from each other so that crosstalk can occur. In order to suppress the crosstalk at ... | 10/06/1998 |
| 5818980 | Polarization-independent, tunable, acousto-optical waveguide device for the wavelength selection of an optical signal An acousto-optical waveguide device for the wavelength selection of an optical signal comprises two polarization conversion stages, one polarization selective input element, one polarization selective output element and two intermediate polarization selec... | 10/06/1998 |
| 5805755 | Self-aligned transition from ridge to buried heterostructure waveguide, especially for multi-wavelength laser array integration An opto-electronic integrated circuit including an active ridge waveguide (60), for example, a semiconductor laser diode, and a passive buried heterostructure semiconductor waveguide (64). The two types of waveguides are chosen for their respective tasks ... | 09/08/1998 |
| 5805751 | Wavelength selective optical couplers A wavelength selective optical fiber coupler having various applications in the field of optical communications is disclosed. The coupler is composed of dissimilar waveguides in close proximity. A light induced, permanent index of refraction grating is re... | 09/08/1998 |
| 5793907 | Method and apparatus for a wavelength selective true-time delay for an optically controlled device A two dimensional encoded filter for providing wavelength and time shifted output signals is comprised of a photonic integrated device in which the input signal is optically demultiplexed into a plurality of wavelength components, fed back on optically ti... | 08/11/1998 |
| 5790729 | Photoplethysmographic instrument having an integrated multimode optical coupler device The integrated multimode optical coupling apparatus comprises an N-to-M optical coupling arrangement that is simple to manufacture, minimizes optical losses and is significantly less expensive than the prior art arrangements of coupling optical signals. T... | 08/04/1998 |
| 5764830 | 1×N and N×N fiber optic couplers The present invention provides fiber optic couplers for use with at least three optic fibers. The optic fibers arranged in a linear array, that is, the optic fibers are coupled side by side. The fibers along either end of the linear-array are coupled only... | 06/09/1998 |
| 5751872 | Wavelength demultiplexer The demultiplexer comprises a diffraction space defined by a reception surface coupled to a grating. In order to obtain output waves of flattened spectral response, the input waveguide and the reception surface are dimensioned so that the input wave diffr... | 05/12/1998 |
| 5751873 | Fibre optic couplers A fused fiber optic 1×4 or 2×4 coupler in which four optical fiber segments (A, B, C, D) extend longitudinally beside each other in a coupling region in which the fiber segments are at least partially fused together to form an assembly exhibiting a clos... | 05/12/1998 |
| 5748811 | Optical switch An optical filter, such as a wavelength-division multiplexer, demultiplexer, or optical router, in which several single-mode waveguides are coupled to the sides of an optical interaction region containing a wavelength dispersive element that collects ligh... | 05/05/1998 |
| 5745618 | Optical device having low insertion loss An optical device 201, having one or more input waveguides 25 coupled to one side of a slab waveguide 20 and an array of output waveguides 26 coupled to an other side of the slab waveguide, is improved by including a transition region 22 immediately adjac... | 04/28/1998 |
| 5745616 | Waveguide grating router and method of making same having relatively small dimensions A compact waveguide grating router is constructed by forming at least first and second free space regions, first and second sets of optical ports, and a grating array, onto a substrate. The grating array is coupled to the first free space region and the s... | 04/28/1998 |
| 5745612 | Wavelength sorter and its application to planarized dynamic wavelength routing This invention provides methods and apparatus for achieving wavelength sorting multiplexer/demultiplexer and its application to the implementation of planarized dynamic wavelength routing. Using integrated arrayed-waveguide gratings, sorting can be achiev... | 04/28/1998 |
| 5742717 | Optical star coupler An optical star coupler that distributes the optical signal radiated from an optical fiber uniformly across the mixing means and couples the distributed optical signal efficiently to the other optical fibers. The optical star coupler includes: a bundling ... | 04/21/1998 |
| 5732171 | Device for spatially separating and/or joining optical wave channels In a phased-array filter, mutually spatially separated planar waveguides arranged on the surface of a substrate between two substrate edges are optically connected to one another by an optical phase shift in the form of a plurality of strip-type optical w... | 03/24/1998 |
| 5717795 | Optical wavelength division multiplexed network system An optical wavelength division multiplexed network system of this invention is designed to permit communications between any of a plurality of nodes via a main trunk line constructed by interconnecting the nodes by use of an optical fiber in a ring form a... | 02/10/1998 |
| 5712936 | Hybrid bi-directional three color wave division multiplexer and method using same A hybrid, bi-directional, three-color, wave-division multiplexer (HB3-WDM), fiber optic communication system employs a combination of wide band and narrow band WDMs to multiplex three pairs of optic signals over two fiber optic cables. The three pairs of ... | 01/27/1998 |
| 5712937 | Optical waveguide including singlemode waveguide channels coupled to a multimode fiber An intrusion-alarmed optical fiber communication system, where light from two or more sources are launched with a planar channel waveguide launcher into two or more modes of a multimode graded-index transmission fiber, is disclosed. Input fibers containin... | 01/27/1998 |
| 5706377 | Wavelength routing device having wide and flat passbands A wavelength routing device 500 includes a pair of dielectric slabs 10, 20 that are interconnected by an optical grating 30. The first dielectric slab 10 includes input ports for receiving optical signals that are routed to output ports of the second diel... | 01/06/1998 |
| 5689595 | Rare earth-doped fiber amplifier assemblies for fiberoptic networks Assemblies having a first optical circulator, a pumping laser, a rare-earth doped fiber and a first coupler are described. The first coupler has a first fiber connected to the optical circulator, a second fiber connected to said pumping laser, and a third... | 11/18/1997 |
| 5684899 | Optical communication network In an optical communication network in which a plural number of nodes are connected to each bidirectional broadcasting bus, and a node communicates with another using the packets, or an optical communication network in which a plural number of nodes are c... | 11/04/1997 |
| 5680492 | Singular fiber to bundle illumination with optical coupler A gradient index (GRIN) lens couples light from a single fiber optic into a fiber bundle or directly into the input port of an illumination device, such as a medical illumination device. The single fiber optic provides a high intensity beam of light havin... | 10/21/1997 |
| 5680490 | Comb splitting system and method for a multichannel optical fiber communication network A comb splitting system demultiplexes and/or multiplexes a plurality of optical signal channels at various wavelengths. The comb splitting system has at least two interconnected successive stages of wavelength division multiplexers (WDMs). A WDM of a firs... | 10/21/1997 |
| 5668903 | Compound laser system for high power densities A compound laser system for generating beams of high brightness and high power density by constructive phase coherent combination of the beams generated by a number of individual sources of coherent radiation three subsystems: a diode laser subsystem whic... | 09/16/1997 |
| 5666447 | Using optical fiber multiplexer to combine light beams in a laser printer A color laser printing apparatus that incorporates the use of fiber optics and a flexible beam-combining device to combine two or more lasers having different wavelengths that correspond to the photosensitivities of the image-receiving media. Use of fiber... | 09/09/1997 |
| 5664037 | Multi-neckdown fiber optic coupler A unitary fiber optic coupling device in which N fibers (Nࣙ3) extend in a parallel array having two coupling regions of reduced cross-sectional area. At least one of the fibers is formed of two sections that are situated end-to-end, an active core-conta... | 09/02/1997 |
| 5636300 | MxO multiplex demultiplex component An M×O multiplex/demultiplex device is disclosed. An M×N coupler is connected to an N×O coupler by phase shifting means. The phase shifting means provide N paths between the couplers, each path having an optical path length different from every other o... | 06/03/1997 |
| 5623369 | Optical splitter An optical splitter arrangement is provided for accepting a light from at least one input and providing multiple light outputs of four or more, a light intensity of the outputs differing from one another no more than two dB, and a light intensity of the c... | 04/22/1997 |
