Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 6351322 | Q detection circuit A testing circuit is provided for determining the Q-factor of an optical communication system. In the testing circuit, a variable attenuator attenuates a received optical signal in response to an attenuator control signal. A first optical-to-electrical co... | 02/26/2002 |
| 6301042 | Fabry-perot optical filter with chirped dielectric mirrors An optical interference filter having high transmissivity at first and second passbands. The interference filter includes a first stack having a plurality of dielectric layers, a second stack having a plurality of dielectric layers, and a spacer interpose... | 10/09/2001 |
| 6233080 | Crosstalk-free signal source for dense wavelength division multiplexed systems An optical device is provided which locks the wavelength output of a laser transmitter in an optical transmission system as well as preventing the propagation of unwanted signals generated by the laser transmitter prior to the transmitter reaching the des... | 05/15/2001 |
| 6229886 | Method and apparatus for providing 56K modem technology for public switched telephone networks To take advantage of 56K modem technology, a data signal must only traverse one digital to analog (D/A) conversion and one analog to digital (A/D) conversion on the return path to a subscriber. However, current data transmission for subscribers served by ... | 05/08/2001 |
| 6215592 | Fabry-perot optical filter and method of making the same An optical filter having broad resonant frequency passbands for filtering an optical input including a plurality of multiplexed optical wavelengths into a first set of transmitted wavelengths and a second set of reflected wavelenghts. The filter has first... | 04/10/2001 |
| 6205269 | Optical add/drop multiplexer An add/drop multiplexer includes first and second fiber grating connected to a four-port optical circulator having first and second input/output ports, an add port, and a drop port, wherein the first fiber grating is connected to the first input/output po... | 03/20/2001 |
| 6188402 | Manufacturing control station A workstation for use in the assembly of component parts includes a computer terminal having a display and at least one input device, a test apparatus operatively coupled to the computer terminal, and an application program which generates a first display... | 02/13/2001 |
| 6178285 | Vision system for inspecting interconnections of optical cards mounted in a rack and associated methods A vision system is provided which allows viewing and/or inspection of an end surface of an optical fiber through a bulkhead on a backplane of a rack. By placing such a vision system on a mount configured to be inserted in the rack, the use of such a visio... | 01/23/2001 |
| 6163392 | Distributed intelligence wavelength division multiplexed network The present invention is directed toward a distributed intelligence fiber-optic communication network in which node control processors (NCPs) associated with each network element periodically transmit identification and status information to the other NCP... | 12/19/2000 |
| 6157863 | Apparatus and method for leveling optical fibers before polishing An optical fiber alignment apparatus for leveling respective distal ends of a plurality of optical fibers prior to commencing a polishing process. The apparatus includes an aligning device having a plurality of receptacles for securing the corresponding p... | 12/05/2000 |
| 6147785 | Coherent crosstalk attenuation apparatus A optical device is provided for reducing coherent crosstalk associated with a particular channel within a communications network. An attenuator is coupled between an emitter associated with a first node and a receiving element associated with a second no... | 11/14/2000 |
| 6141125 | Intra-node diagnostic signal A method for monitoring a plurality of components associated with a communications network node. A diagnostic service signal is generated at an intra-node component and transmitted along a first optical path to another intra-node component where the prese... | 10/31/2000 |
| 6131896 | Optical assembly workstation having an elevated work surface movable relative to a principal work surface An optical assembly workstation includes a principal work surface and a movable work surface arranged above the principal work surface, with the elevated work surface being movable back and forth in at least one axial direction relative to the principal w... | 10/17/2000 |
| 6125128 | Laser output locking and self filtering device In accordance with the present invention, an optical device is provided which is used to lock the output of an optical transmitter as well as being employed as a self-filtering element within an optical system. An optical transfer element, coupled along t... | 09/26/2000 |
| 6122561 | Precision continuous surface guided optical module carrier and method of using same An optical module inspection circuit on an optical platform includes an optical module carrier for precisely aligning optical devices with optical interfaces of inspection equipment located at fixed positions in the optical module inspection circuit. The ... | 09/19/2000 |
| 6101423 | Method and apparatus for sorting components The component parts for assembly of a device, such as the passive optical components of an optical amplifier, are automatically selected from among a supply of available component parts. Each component part has a performance parameter such as insertion lo... | 08/08/2000 |
| 6088503 | Optical fiber precision handling tool A metrology frame for holding, transporting and aligning optical fibers while interconnecting optical fibers. The metrology frame includes an elongated rail and a pair of brackets slidably attached to the rail. The brackets are interconnected to a drive m... | 07/11/2000 |
| 6088493 | Fiber shuffle interconnection apparatus and method An apparatus and method is provided for optical cross connections. A guide structure is used to guide optical fiber fed to various stations on the guide structure which correspond to input and output ports of a fiber shuffle interconnect. Once the fiber h... | 07/11/2000 |
| 6079297 | Fiber optic precision linear stripper A linear stripper for removing a coating on a fiber optic cable, includes a guide rail and a cutting assembly slidably connected to the guide rail. The cutting assembly has a passage configured to accommodate a fiber optic cable threaded therethrough. A b... | 06/27/2000 |
| 6067181 | Laser locking and self filtering device In accordance with the present invention, an optical device is provided which is used to lock the output of an optical transmitter as well as being employed as a self-filtering element within an optical system. An optical transfer element, coupled along t... | 05/23/2000 |
| 6057948 | Protection switch optical communications system An optical communication system which includes a working communication line for carrying a wavelength division multiplexed signal having N channels and a protection line for carrying the multiplexed signal when the working line is out of service. Optical ... | 05/02/2000 |
| 6039630 | Apparatus and method for calibrating pressure existing between optical fibers and a polishing pad during a polishing process A calibration apparatus and method for a polishing machine includes a ferrule surrounding a polishing pad and a plurality of sensors attached to the ferrule. Each of the sensors is directed at a location where optical fibers extending downwardly from a le... | 03/21/2000 |
| 6002503 | Optical add/drop multiplexer In accordance with the present invention, a WDM communication signal including a service channel is received by an add/drop multiplexer. An optical filter element included in the multiplexer separates a first optical payload channel and the service channe... | 12/14/1999 |
