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 |
| 7332234 | Optoelectronic device capable of participating in in-band traffic An optoelectronic device that has a network address (e.g., IF address) and participates in in-band traffic for purposes of performing functions (e.g., network diagnostics, network control, network provisioning, fault isolation, etc.) that are traditionally performed... | 02/19/2008 |
| 7257325 | Method and system for monitoring multiple optical communications lines The present invention provides a method and system for monitoring composite optical signals carried over plural fiber-optic lines within an optical network. Methods and systems in accordance with the present invention each utilize a single OPM to monitor each one of... | 08/14/2007 |
| 7088491 | Pulse generating apparatus and method An apparatus and method generating an optical pulse of picosecond class (having a high duty ratio), which accurately and stably operates at an arbitrary repetition frequency, has a high OSNR, and is not restricted by an RF modulation frequency, are provided. New mod... | 08/08/2006 |
| 7076175 | Method of setting up two-way optical communication between a central unit and a remote unit A method of setting up two-way optical communication between a central unit and a remote unit suitable for operating in a given communication mode selected from a plurality of communication modes. A plurality of frame patterns is defined in the central unit, with ea... | 07/11/2006 |
| 6847760 | Spatially resolved equalization and forward error correction for multimode fiber links A system is described that includes a system for correcting modal dispersion and errors in an optical fiber system. The system includes a multisegment photodetector coupled to an end of an optical fiber for detecting optical signals exiting the optical fiber and for... | 01/25/2005 |
| 6788863 | Optical delay device An optical device is provided comprising a delay region having a photonic band structure, an optical input, an optical output, wherein the optical input is adapted to couple input optical signals into a predetermined mode in the delay region such that the optical si... | 09/07/2004 |
| 5903683 | Device for modulating an optical signal using a single wave guide The present invention is a device for adding delay and compensating for dispersion in an optical signal. In a first embodiment, the present invention is made up of a waveguide, preferably an optical fiber, having two or more forward-reflecting gratings fo... | 05/11/1999 |
| 5651080 | Optical exchanging apparatus using mode conversion and mode selection in an optical waveguide An optical exchanging apparatus is disclosed including N optical transmitters for generating optical signals each having a single constant mode, N mode converters for converting modes of the optical signals generated from the optical transmitters accordin... | 07/22/1997 |
| 5517589 | Optical wavelength multiplexing and demultiplexing device for multiplexing or demultiplexing light having a plurality of modes and photodetector using the same An optical wavelength multiplexing and demultiplexing device includes a first waveguide and a plurality of waveguides having different propagation constants. The first waveguide is caused to be coupled with the plurality of waveguides in different modes. ... | 05/14/1996 |
| 5485296 | Monitor unit for monitoring an optical waveguide A monitor unit for detecting physical interference of a communications fibre in a transmission system includes a monitor circuit coupled to the communications fibre. A portion of a signal being transmitted along the communications fibre is coupled out of ... | 01/16/1996 |
| 5347525 | Generation of multiple stabilized frequency references using a mode-coupled laser A technique for generating a large number of stabilized optical frequencies suitable for use in a wide variety of applications, including a multi-channel optical communications system, optical processing, optical computing, and heterodyne generation of st... | 09/13/1994 |
| 5109443 | Detection of stress applied to an optical fiber Shocks or sudden stresses caused by attempts to tap into an optical fiber network are detected by monitoring the "speckle pattern" produced by intermodal interference at the output of a multimode fiber. The fiber is a single mode optical fiber communicati... | 04/28/1992 |
| 5050952 | Optical communications system for diplex or duplex transmission For an optical communications system for diplex or duplex transmission, especially for the subscriber area, a new multiplexing process, namely, the combination of fiber mode multiplexing and wavelength multiplexing, is reported, i.e., the two signals to b... | 09/24/1991 |
| 5003623 | Bimodal intrusion detection in an optical fiber communication system using graded index fiber An intrusion-alarmed optical communication system in which two separate modal groups are launched into a single graded index transmission fiber. The system includes two light sources and a lens to focus the light sources into the transmission fiber. A spa... | 03/26/1991 |
| 4942623 | Device and method for modal separation and combination in an optical fiber intrusion detection system Apparatus and a corresponding method for launching two light beams into an optical fiber as two separate modal groups, and for separating light emanating from a fiber into two modal groups. The apparatus includes first and second lenses and a spatial moda... | 07/17/1990 |
| 4817205 | Bimodal optical fiber communication system using graded index fiber An optical communication system in which at least two separate modal groups are launched into a single graded index transmission fiber. The system includes two light sources and a lens to focus the light sources into the transmission fiber. A spatial filt... | 03/28/1989 |
| 4535440 | Optical multiplexer Identical coupling conditions are achieved in an integrated optical component by pairs of branch tracks which successively intersect into a central track. Low attenuation values are achieved with angles of incidence of 1.5 degrees.... | 08/13/1985 |
| 4366565 | Local area network optical fiber data communication A method and apparatus are disclosed for high speed multiaccess data communication using guided wave components and angular division multiplexing for parallel optical signal transmission over a multimode optical fiber. A receiver at each station in the ne... | 12/28/1982 |
| 4134642 | Optical fibre with increased security An optical fibre has a plurality of light conducting cores surrounded by a cladding layer of lower refractive index than the cores. A light conducting layer is on the cladding layer with a refractive index higher than that of the cladding layer, and a sec... | 01/16/1979 |
