Optical network and switch control method for use in the optical network
What is claimed is: 1. A method of controlling a switching operation of an optical network comprising: a plurality of optical transmitters; a plurality of optical receivers, each said receiver having ... Read More
Inventors: Tajima, Akio;, Assignee: NEC Corporation (Tokyo, JP) |
System for transmitting optical data
Also, the aim of the invention is to propose a transmission system which is more flexible to use and which is easier to optimize for each type of optical link and for each transmission distance. To be... Read More
Inventors: Penninckx, Denis; Bridoux, Christophe;, Assignee: Alcatel (Paris, FR) |
Semiconductor optical device with light controlling layer of super-lattice structure
It is therefore an important object of the present invention to provide a semiconductor optical device which is free from the problem inherent in the prior art semiconductor optical devices. To accomp... Read More
Inventors: Makita, Kikuo;, Assignee: NEC Corporation (Tokyo, JP) |
Binary stratified structures for periodically pumped semiconductor lasers
OF THE PREFERRED EMBODIMENT I. Introduction The preferred embodiment of the invention is discussed in detail below. While specific steps, configurations and arrangements are discussed, it should be u... Read More
Inventors: Chen, Howard Z.; Cho, Alfred Y.;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Semiconductor laser device and method for fabricating the same and strained quantum well crystal and method for fabricating the same
The semiconductor laser device of the invention includes: a strained quantum well structure including a well layer and a barrier layer, and a semiconductor substrate for supporting the strained quantu... Read More
Inventors: Otsuka, Nobuyuki; Kito, Masahiro; Ishino, Masato; Matsui, Yasushi;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Laser diode optical wavelength control apparatus
It an object of the present invention to provide a photodiode optical wavelength control apparatus which, even when the optical center wavelength is largely shifted to fall outside the range of the op... Read More
Inventors: Yoshida, Toshiro;, Assignee: NEC Corporation (Tokyo, JP) |
Diode laser with tunnel barrier layer
The present invention provides for visible light emitting semiconductor lasers with improved heterobarrier leakage characteristics. The improved leakage characteristics are a result of a thin tunnel b... Read More
Inventors: Bour, David P.; Thornton, Robert L.;, Assignee: Xerox Corporation (Stamford, CT) |
Composites made from single crystal substances
The present invention provides a formation method for, and constructs of, bonded glass laminates or bonded laminate composites of glass and glass-containing substances such as glass ceramics, or bonde... Read More
Inventors: Meissner, Helmuth E.;, Assignee: Onyx Optics (Pleasanton, CA) |
Composite solid state lasers of improved efficiency and beam quality
The thermal uniformity of any three- or four-level solid laser system is improved by using a composite of lasing and non-lasing sections. This technique may also be used to eliminate any thermal disto... Read More
Inventors: Meissner, Helmuth E.; McMahon, John M.;, Assignee: |
Wavelength tunable laser of small size
An object of this invention is to provide a wavelength tunable laser device easy to be controlled and excellent in a wavelength selectivity. Another object of this invention is to provide a wavelength... Read More
Inventors: Tanaka, Shinsuke; Morito, Ken; Takabayashi, Kazumasa;, Assignee: Fujitsu Limited (Kawasaki, JP) |
Remote control system of an optical repeater
It is an object of the present invention to overcome the disadvantages and limitations of a prior remote control system of an optical repeater by providing a new and improved remote control system of ... Read More
Inventors: Seki, Norio; Yatsuzuka, Yohtaro; Sakaguchi, Haruo;, Assignee: Kokusai Denshin Denwa Co., Ltd. (Tokyo, JP) |
Optical matrix switch
The basic principles of the invention will be described in accordance with the embodiment illustrated in FIGS. 1-3. FIG. 1 illustrates schematically the basic components of the switch. A semiconducto... Read More
Inventors: Levinson, Frank H.;, Assignee: AT&T Bell Laboratories (Murray Hill, NJ) |
Method for monitoring a digital transmission line
The present invention overcomes the drawbacks noted above in the prior art, and it seeks to provide a digital transmission line monitoring control system capable of transmission line monitoring contro... Read More
Inventors: Oda, Hidenori; Yano, Hiroaki;, Assignee: Kokusai Denshin Denwa Co., Ltd. (Tokyo, JP) |
High speed digital data correlator having a synchronous pipelined full adder cell array
The objects, features and advantages of the present invention are summarized below. The high speed digital data correlator of the present invention utilizes a synchronous pipelined single bit full add... Read More
Inventors: Brost, Andrew C.;, Assignee: Ampex Corporation (Redwood City, CA) |
Optical switch
According to one aspect of the invention, there is provided an optical switch in which the armature comprises a metal coating electroplated on the end portion of the first fiber which is mounted for t... Read More
Inventors: ten Berge, Eduardus F. A.; van Alst, Gerardus M.;, Assignee: AMP Incorporated (Harrisburg, PA) |
Digital telemetry system and method for fault detection in optical transmission system
According to one aspect of the present invention there is provided a digital telemetry system for use with an optical transmission system including a transmission terminal, a plurality of concatenated... Read More
Inventors: Hadjifotiou, Anagnostis; Pettitt, Martin J.;, Assignee: Northern Telecom Limited (Quebec, CA) |
Long sequence correlation coprocessor
The present invention is directed to providing a long sequence correlation coprocessor (LSCC) 100 for correlating two binary sequences of data. Each of a number of sequential counters 130a-130n tallie... Read More
Inventors: Gage, Douglas W.;, Assignee: The United States of America as represented by the Secretary of the Navy (Washington, DC) |
Data transmission on optical networks
According to the present invention in a system for transmitting data cells from a transmitter to a receiver via a network, each cell comprises a fixed format header containing at least addresser routi... Read More
Inventors: Pearson, Ian D.;, Assignee: British Telecommunications public limited company (London, GB2) |
Optical wavelength division multiplexer for high speed, protocol-independent serial data sources
The foregoing and other problems are overcome by wavelength division multiplex communications apparatus that is constructed in accordance with the invention, and by a method of operating same. The met... Read More
Inventors: Choy, Michael M.; Green, Jr., Paul E.; Hall, William E.; Janniello, Frank J.; Kravitz, Jeff K.; Liu, Karen; Ramaswami, Rajiv; Tong, Franklin F.;, Assignee: International Business Machines Corporation (Armonk, NY) |
Optical wavelength selection control system in optical networks
An object of the invention, therefore, is to overcome the problems existing in the prior art and to provide an improved wavelength selection control system which enhances throughput of an optical netw... Read More
Inventors: Nishio, Makoto;, Assignee: NEC Corporation (JP) |
Optical fiber switching system and method using same
The present invention provides an improved optical fiber switching system which is capable of aligning any one of a first group of optical fibers with any one of a second group of optical fibers more ... Read More
Inventors: Laor, Herzel;, Assignee: Astarte Fiber Networks, Inc. (Boulder, CO) |
Termination for high frequency clock distribution path
The present invention is a clock generator system that includes a pair of substantially identically structured clock generator units, respectively termed "Master" and "Shadow." The clock generator uni... Read More
Inventors: Mirov, Russell N.; Le, Duc N.; Mikalauskas, Frank; Grebenkemper, C. John; Kwan, Kinying;, Assignee: Tandem Computers Incorporated (Cupertino, CA) |
Logical transform operator-based method and apparatus for extracting framing pattern from serial digital bit stream
In accordance with the present invention, the above described shortcomings of conventional `direct` analysis approaches to framing pattern synchronization are effectively obviated by taking advantage ... Read More
Inventors: McCullough, Jason F.; Hall, III, Clifford L.;, Assignee: Adtran, Inc. (Huntsville, AL) |
Two plate-like beam splitting device
An object of the present invention is to provide a compact optical head. Another object of the present invention is to provide an optical head which can be constructed easily. In an optical head of th... Read More
Inventors: Hayashi, Takao; Nakamura, Toru; Aiko, Hideki; Matsubara, Akira;, Assignee: Matsushita Electric Industrial Co., Ltd. (Osaka, JP) |
Method and apparatus for receiving symbols
We claim: 1. An apparatus for receiving symbols comprising: a symbol source for providing a plurality of raw symbols; a delay line, operably coupled to the symbol source, for producing delayed symbols... Read More
Inventors: Hiben, Bradley M.; Newberg, Donald G.; LoGalbo, Robert D.;, Assignee: Motorola, Inc. (Schaumburg, IL) |
Fault management in a multichannel transmission system
The present invention describes methods for rerouting channels on failed line cards to spare line cards. It uses very limited switching in combination with carefully designed interconnection patterns ... Read More
Inventors: Gerstel, Ornan Alexander; Hall, William Eric; Ramaswami, Rajiv; Sasaki, Galen Hajime;, Assignee: Tellabs Operations, Inc. (Lisle, IL) |
Maintenance of optical networks
FIG. 1 shows one embodiment of the present invention in which an identifier tone is added to an optical carrier modulated with an information signal. A dithering element 2 such as an intensity modula... Read More
Inventors: Fatehi, Mohammad T.; Heismann, Fred Ludwig;, Assignee: Lucent Technologies Inc. (Murray Hill, NJ) |
Dual rate, burst mode, radiation hardened, optical transceiver
In accordance with this invention, a transceiver for recovering one (1) MBit and twenty (20) MBit manchester coded, optical data signals from a photodiode is provided. The transceiver includes a large... Read More
Inventors: Bonebright, Rodney K.; Hughes, Rodney A.; Clement, Jay W.; Nitardy, John H.;, Assignee: The Boeing Company (Seattle, WA) |
Fault detection for all-optical add-drop multiplexer
The present invention is generally directed to all-optical networks, in which networks nodes are interconnected by single-mode optical fibers. FIG. 1A is a high level diagram of an optical network in... Read More
Inventors: Gerstel, Ornan Alexander; Li, Chung-Sheng; Ramaswami, Rajiv; Yue, Chaoyu;, Assignee: International Business Machines Corporation (Armonk, NY) |
M input port by N output port optical switching system
In accordance with the present invention, such drawbacks of conventional optical switching systems are effectively obviated by an M input N output multiport optical switching system, which is operativ... Read More
Inventors: Young, Eddie H.; Ghassemi, Faramarz Frank;, Assignee: Neos Technologies, Inc. (Melbourne, FL) |
Fault Detection 
