Signal detection circuit using a plurality of delay stages with edge detection logic
What is claimed is: 1. A circuit for detecting a digital signal, comprising: a plurality of delay stages coupled in series; edge detection logic coupled to an input of a delay stage from among said de... Read More
Inventors: Bell, Russell;, Assignee: Advanced Micro Devices, Inc. (Sunnyvale, CA) |
Power regulation in optical networks
The invention is a circuit for controlling optical power levels. The circuit includes at least one electrically controllable optical attenuator having an input for receiving an optical input signal, a... Read More
Inventors: Anthony, Philip John; Heismann, Fred Ludwig; Murphy, Edmond Joseph; Murphy, Timothy O.;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Free-space optical signal switch arrangement
In the following description, each item or block of each figure has a reference designation associated therewith, the first number of which refers to the figure in which that item is first located (e... Read More
Inventors: Fatehi, Mohammad Taghi; Ford, Joseph Earl;, Assignee: Lucent Technologies Inc (Murray Hill, NJ) |
Method of identifying faults in WDM optical networks
In accordance with the present invention, the aforementioned deficiencies are overcome and an advance is made in the art by a method in which changes in the number of channels and changes in power com... Read More
Inventors: Zyskind, John Lehrer;, Assignee: Lucent Technologies, Inc. (Murray Hill, NJ) |
Differential detector with error correcting function
In the light of the state of the art described above, it is an object of the present invention to provide a differential detector imparted with error correcting function for demodulating a differentia... Read More
Inventors: Sudo, Hiroaki; Hiramatsu, Katsuhiko; Uesugi, Mitsuru;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Sub-carrier multiplexing in broadband optical networks
In accordance with one embodiment of our invention, a WDM fiber-optic network includes a unique laser transmitter which enables signals to be routed at three hierarchical levels: at one level discrimi... Read More
Inventors: Adams, Laura Ellen; Bethea, Clyde George; Nykolak, Gerald; People, Roosevelt; Tanbun-Ek, Tawee;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Multichannel ring and star networks with limited channel conversion
The invention proposes configurations of ring and star networks with limited channel conversion to efficiently support connections. In addition, algorithms are provided to efficiently assign channels ... Read More
Inventors: Ramaswami, Rajiv; Sasaki, Galen;, Assignee: Tellabs Operations, Inc. (Lisle, IL) |
Wavelength division multiplexed optical networks
FIG. 1 shows schematically a 16 channel ADM 10 illustrative of an embodiment of the invention. Of course, fewer or more channels are feasible. An input waveguide, typically an optical fiber 12, serve... Read More
Inventors: Aksyuk, Vladimir A.; Barber, Bradley P.; Bishop, David J.; Giles, Clinton R.; Stulz, Lawrence W.; Ruel, Rene R.;, Assignee: Lucent Technologies (Murray Hill, NJ) |
Cross-connecting optical translator array
The present invention is an apparatus and method that enhances optical cross-connect capability by electronically switching opto-electronically converted signals received from optical communication sy... Read More
Inventors: Fatehi, Mohammad T.; Gartner, William Joseph;, Assignee: Lucent Technologies, Inc. (Murray Hill, NJ) |
Packaged microelectromechanical devices and systems
Preferred implementations of the various aspects of the invention will now be described while referring to the figures, several of which may be simultaneously referred to during the course of the fol... Read More
Inventors: Bhalla, Kulbir Singh;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Computerized intelligent optical amplifier for multi-channel optical networks
I claim: 1. An optical signal translation system comprising: (a) an optical amplifier, for receiving an input signal and delivering an amplified output signal, (b) an input optical signal sampling dev... Read More
Inventors: Yang, Dan D.;, Assignee: AFC Technologies Inc. (Nepean, CA) |
Networked photonic signal distribution system
The present invention is a networked photonic signal distribution system. The system employs commercially available and economical optical switches, optical fiber, and a common emitter and detector. R... Read More
Inventors: Sharp, Gordon P.;, Assignee: Aircuity, Inc. (Newtown, MA) |
Protection schemes for mirror-failure in free-space micromachined optical switches
The present invention provides a device and method for achieving protection in a free-space micromachined optical switching fabric. The present invention provides two protection schemes for mirror fai... Read More
Inventors: Lin, Lih Y.; Saleh, Adel A. M.; Simmons, Jane M.;, Assignee: AT&T Corporation (Middletown, NJ) |
Control arrangement for optical mechanical switches
A preferred implementation of the various features of the invention will now be described while referring to FIGS. 1 and 2. In FIG. 1, an optical switch 11 directs modulated light signals to appropri... Read More
Inventors: Bhalla, Kulbir Singh; Gottlieb, Albert Maxwell;, Assignee: Lucent Technologies, Inc. (Murray Hill, NJ) |
Multi-wavelength cross-connect optical switch
It is therefore an object of this invention to provide an improved multi-wavelength cross-connect optical switch which is scalable in port number beyond 2.times.2. Another object of the invention to p... Read More
Inventors: Solgaard, Olav; Heritage, Jonathan P.; Bhattarai, Amal R.;, Assignee: The Regents of the University of California (Oakland, CA) |
Method and apparatus for transferring data between IP network devices and SCSI and fibre channel devices over an IP network
The present invention solves the above and other problems, thereby advancing the state of the useful arts, by providing methods and apparatus for transferring data between storage device interfaces an... Read More
Inventors: Latif, Aamer; Mullendore, Rodney N.; White, Joseph L.; Uchino, Brian Y.;, Assignee: Nishan Systems, Inc. (San Jose, CA) |
Method and apparatus for terminating optical links in an optical network
Generally, a method and apparatus are disclosed for terminating optical links in an optical network. The present invention recognizes that while the forced termination of the protection ring at each n... Read More
Inventors: Prasanna, G. N. Srinivasa;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Optical switch fabric with redundancy
An optical switch fabric is described that has an input stage, an output stage, and a center stage coupled in a cascaded manner. The center stage includes (1) a minimum number of center switches great... Read More
Inventors: Corbalis, Charles Matthew; Helkey, Roger Jonathan; Fant, Walt Joseph;, Assignee: Calient Networks, Inc. (San Jose, CA) |
Alternative doping for AlGaInP laser diodes fabricated by impurity-induced layer disordering (IILD)
The polarity of the semiconductor layers in an AlGaInP semiconductor laser fabricated by impurity induced layer disordering (IILD) is reversed to allow n-doping. Thus, the cladding and confinement lay... Read More
Inventors: Bour, David P.; Thornton, Robert L.; Beernink, Kevin J.;, Assignee: Xerox Corporation (Stamford, CT) |
Far-infrared electromagnetic wave generator
It is a primary object of the present invention to provide an improved far-infrared electromagnetic wave generator made of a semiconductor having a higher efficiency than that of the conventional one.... Read More
Inventors: Nishizawa, Jun-ichi; Suto, Ken;, Assignee: Zaidan Hojin Handotai Kenkyu Shinkokai (Sendai, JP) |
Optically pumped, praseodymium based solid state laser
Accordingly, it is an object of this invention to provide an efficient mid-IR rare earth laser. It is a further object of this invention to provide such a laser operating at wavelengths of about 7 .mu... Read More
Inventors: Bowman, Steven R.; Ganem, Joseph; Feldman, Barry J.;, Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC) |
Method and apparatus for initialization of cryptographic terminal
The present invention provides a method and apparatus for initializing cryptographic terminals in a cryptographic system. The invention provides a base key that is common to all controllers produced b... Read More
Inventors: Abraham, Dennis G.; Hite, Richard K.;, Assignee: Visa International Service Association (Foster City, CA) |
Intersubband quantum box semiconductor laser
In accordance with the present invention, semiconductor lasers are formed to provide highly efficient emission at selected wavelengths, which may lie in the mid-to far-infrared range. Such semiconduct... Read More
Inventors: Botez, Dan; Zory, Peter S.; Hsu, Chia-Fu;, Assignee: Wisconsin Alumni Research Foundation (Madison, WI) |
Article comprising an electric field-tunable semiconductor laser
In a broad aspect the invention is embodied in an article (e.g., a trace gas detection or analysis system) that comprises an electric field-tunable semiconductor laser, or in an electric field-tunable... Read More
Inventors: Capasso, Federico; Cho, Alfred Yi; Faist, Jerome; Hutchinson, Albert Lee; Sirtori, Carlo; Sivco, Deborah Lee;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Quantum well infared image conversion panel and associated methods
Given the up-conversion device, the QWIP-LED described above with its circuit representation shown in FIG. 3, a large diode with an optical window 44 as is shown in FIG. 4b can be used as an image up... Read More
Inventors: Liu, Hui-Chun;, Assignee: National Research Council of Canada (Ottawa, CA) |
Quantum cascade laser
This need is addressed in accordance with one aspect of our invention, a QC laser comprising first and second optical confinement regions (i.e., claddings), and an In-based, Group III-V compound, QC a... Read More
Inventors: Baillargeon, James Nelson; Capasso, Federico; Cho, Alfred Yi; Gmachl, Claire F.; Sivco, Deborah Lee; Beck, Mattias; Faist, Jerome;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Semiconductor heterostructure radiation detector having two spectral sensitivity ranges
The present invention relates to a semiconductor heterostructure radiation detector having two spectral sensitivity ranges provided by means of adjacent semiconductor layer regions in which photons ha... Read More
Inventors: Schneider, Harald; Schoenbein, Clemens;, Assignee: Fraunhofer Gesellschaft zur Foerderung der angewandten Forschung e.V. (Munich, DE) |
Semiconductor laser with kink suppression layer
The wafer-to-wafer fabrication optimization is costly, and yields are decreased since many times portions of the wafers are sacrificed for testing. Moreover, tolerances required in the fabrication are... Read More
Inventors: Bowler, Dennis P.;, Assignee: Lasertron (Bedford, MA) |
Lithography using quantum entangled particles
What is claimed: 1. A quantum method, comprising: obtaining multiple entangled photons; and using said photons in an interferometer that forms an interference fringe; said interference fringe being gr... Read More
Inventors: Williams, Colin; Dowling, Jonathan;, Assignee: California Institute of Technology (Pasadena, CA) |
Synchronous servo control for a tunable laser
OF THE ILLUSTRATED EMBODIMENTS FIG. 2 is a schematic diagram of a tunable laser synchronous servo control system (laser system) 200 according to an embodiment of the present invention. The laser syst... Read More
Inventors: Pontis, George D.; Sprock, Douglas A.; Carney, Robert A.; Koller, Ken P.; Batra, Rajesh K.;, Assignee: Intel Corporation (Santa Clara, CA) |
Fault Detection 
