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Vladimir Zworykin, television pioneer ; Talking about an invention in which he played a critical role.
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| Number | Title | Issue Date |
| 8170421 | Method and apparatus for clock recovery A clock recovery method and apparatus is provided. The high-order demultiplexing-demapping unit (102) demultiplexes and demaps the high-order OTN frame (101) into N low-order ODTUjk frames (103), and transmits the N low-order ODTUjk frames (1... | 05/01/2012 |
| 8098995 | Optical signal synchronization sampling apparatus and method, and optical signal monitoring apparatus and method using the same An electroabsorption optical modulator used as a sampling element has two optical terminals and a power supply terminal, the two optical terminals are used to input and output light, and the power supply terminal imparts an electric field to an optical path connecti... | 01/17/2012 |
| 8090268 | Long-distance synchronous transmission method using optical fiber A process for transmitting data on an optical fiber including multiplexing in wavelength signals coming from a plurality of monochrome transmitters, each of which has its own wavelength, and modulating information to be transmitted by a carrier realized per channel,... | 01/03/2012 |
| 8078060 | Optical synchronization system for femtosecond X-ray sources Femtosecond pump/probe experiments using short X-Ray and optical pulses require precise synchronization between 100 meter-10 km separated lasers in a various experiments. For stabilization in the hundred femtosecond range a CW laser is amplitude modulated at 1-10 GH... | 12/13/2011 |
| 8068743 | System and method for precise, accurate and stable optical timing information definition An optoelectronic timing system includes an adaptive frequency generator system in which optical pulses are developed by a semiconductor laser. The pulses are directed into a number of time-quantifiable optical paths. Time quantification for a pulse is based upon th... | 11/29/2011 |
| 8019228 | Optical switching transmission system with timing correction An optical transmission system capable of time difference correction without increasing guard times, thereby improving optical packet transmission efficiency. An optical switching processor sets identical switching timing for input ports thereof such that optical si... | 09/13/2011 |
| 8005369 | Apparatus for synchronizing clock in real-time locating system and method therefor A highly precise clock synchronization apparatus in a real-time locating system (RTLS), includes an optical transmitting/receiving unit for receiving a clock information frame from a clock synchronization server, converting the received clock information frame in se... | 08/23/2011 |
| 7991296 | Method and apparatus for data frame synchronization and delineation A circuit and method to synchronize with a data transmission having a plurality of data transmission frames each with a start boundary identified by a predetermined synchronization pattern, includes comparing sets of data within the data transmission to a predetermi... | 08/02/2011 |
| 7970285 | Multichannel optical transport network optical detection skew calibration A system and method are provided for calibrating temporal skew in a multichannel optical transport network (OTN) transmission device. The method accepts a pair of 2n-phase shift keying (2n-PSK) modulated signals, as well as a pair of 2p | 06/28/2011 |
| 7965946 | Multichannel optical transport network skew calibration A system and method are provided for calibrating skew in a multichannel optical transport network (OTN) transmission device. The method accepts a pair of 2n-phase shift keying (2nPSK) modulated signals via Ix and Qx electrical signal paths, whe... | 06/21/2011 |
| 7881617 | Buffering schemes for optical packet processing An optical packet processor includes one or more optical packet inputs that receive asynchronous optical packets. An optical packet interconnect directs the optical packets from the different optical packet inputs to different optical packet outputs. The optical pac... | 02/01/2011 |
| 7747173 | Multi-phase clocking of integrated circuits using photonics Embodiments of an integrated circuit are described. This integrated circuit includes a clock-generator circuit configured to provide a clock signal and an optical clock path coupled to the clock-generator circuit. Note that the optical clock path is configured to di... | 06/29/2010 |
| 7734188 | Deskew device and deskew method In a receiver, a skew detector detects a skew between two synchronization symbols having different wavelengths among synchronization symbols included in received signals. A skew rough adjustment calculator calculates a delay compensation amount for each received sig... | 06/08/2010 |
| 7715726 | High immunity clock regeneration over optically isolated channel An optically isolated circuit device includes a first opto-isolator circuit that is driven by a first clock signal, and the output of the first opto-isolator circuit is used to drive a phase-locked loop (PLL) that is configured to synthesize a second clock signal ha... | 05/11/2010 |
| 7715725 | Lock detector and optical phase-locked loop system A lock detection apparatus detecting lock of an optical phase-locked loop apparatus including a first phase detector comparing phases of an input light signal and a beat light signal to output a first phase comparison signal, a loop filter forming the first phase co... | 05/11/2010 |
| 7664403 | Synchronizing nodes in an optical communications system utilizing frequency division multiplexing Attenuation caused by dispersion in an optical fiber communications system is compensated. A number of low-speed channels is to be transmitted across an optical fiber. Each low-speed channel is allocated a different frequency band for transmission. The attenuation c... | 02/16/2010 |
| 7646984 | Clocking of integrated circuits using photonics Embodiments of an integrated circuit are described. This integrated circuit includes: a clock-generator circuit configured to provide a clock signal; an optical clock path coupled to the clock-generator circuit; and a latch coupled to the optical clock path. This op... | 01/12/2010 |
| 7616899 | Synchronizing method in optical access network, optical switching device, center device, and remote device To provide synchronizing methods, optical switch modules, center devices, remote devices, optical access systems, optical access networks, programs, and recording media in the optical access network which can give the connection start time of the upstream optical sw... | 11/10/2009 |
| 7613399 | Optical transmission system, optical transmitter, and optical receiver In order to improve a transmission speed of multilevel light transmission, increasing the number of light emitting elements is effective. However, in a method in which light outputs from a plurality of light emitting elements are added, because common mode noise con... | 11/03/2009 |
| 7593644 | Synchronization of lasers and RF sources using timing information transfer in the optical domain A RF-synchronization system includes a laser that creates pulse trains for synchronization. A modulation means transfers the timing information of the pulse train into an amplitude modulation of an optical or electronic system. A synchronization module changes the d... | 09/22/2009 |
| 7574142 | Communications system In a telecommunication system, channels of information are modulated onto respective carriers that are swept repeatedly across a frequency range in a time-staggered fashion so that, at any one time each carrier is at a different frequency. The carriers are multiplex... | 08/11/2009 |
| 7522841 | Efficient data transmission and training of data processing functions A method of a conveying data through an optical communications system. An optical signal is received through the optical communication system, the optical signal comprising data symbols and SYNC bursts, each SYNC burst having a predetermined symbol sequence. The rec... | 04/21/2009 |
| 7443843 | Terminal relay device and relay method An apparatus has a cross connection circuit, first switching sections located on the input side of the cross connection circuit to switch a presently-used transmission path and a reserve transmission path, and second switching sections located on the output side of ... | 10/28/2008 |
| 7444085 | DQPSK optical receiver circuit A DQPSK optical signal is split by the splitter 1 into Data 1 and Data 2 systems. For each system, a phase-modulated optical signal is converted into an intensity modulated electric signal, and clock reproduction and data reproduction are indepe... | 10/28/2008 |
| 7440702 | Method for transmitting digital image signal, digital image transmitting device, digital image sending device and digital image receiver A multiplexer of a transmission section generates a clock signal by multiplying a reference clock signal of a digital image signal by a predetermined number âKâ. A parallel digital image signal is converted into a serial digital signal on the basis of the clock ... | 10/21/2008 |
| 7440700 | Apparatus for testing performance of optical transceiver Provided is an apparatus for testing the performance of an optical transceiver by referencing various performance clocks provided by an OTU2 signal connection transceiver and an STM-64/OC-192 signal. The apparatus for testing performance of an optical transceiver in... | 10/21/2008 |
| 7437081 | System and method for providing two-way communication of quantum signals, timing signals, and public data A system and method for providing two-way communication of quantum signals, timing signals, and public data is provided. Generally, the system contains a first public data transceiver capable of transmitting and receiving public data in accordance with a predefined ... | 10/14/2008 |
| 7437083 | Wavelength converter A wavelength converter for binary optical signals includes an interferometer structure (110) for generating an output signal by modulating a received local signal (LS) according to the modulation of a fUrther received first input signal (IS 1). When su... | 10/14/2008 |
| 7437082 | Private optical communications systems, devices, and methods A method for transmitting traffic in an optical communication system comprising separating the input traffic into a plurality of data signals, parameter encoding the data signals, transmitting each of the data signals on a separate optical channel, receiving the dat... | 10/14/2008 |
| 7423564 | Optical signal processing device for A/D converter including optical encoders with nonlinear loop mirrors An optically sampling device optically samples an optical analog signal using a sampled signal having a predetermined sampling frequency, and outputs control light having a pulse train of an optically sampled optical analog signal. A signal generating device generat... | 09/09/2008 |
| 7421212 | Detecting and locating pulses using a Bragg cell Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated light beam is proportional to the signal current. The modulated light b... | 09/02/2008 |
| 7418212 | Electrical detection of optical symbols A system and method for detecting digital symbols carried in a received optical signal. The system comprises a functional element operative to receive a stream of samples of an electrical signal derived from the received optical signal and to evaluate a non-linear f... | 08/26/2008 |
| 7409157 | Optical switch The present invention provides an optical switch in which a switching operation is not affected even when the polarization state of a control light varies. The optical switch includes a loop-form optical waveguide loop circuit formed from an optical nonlinear medium... | 08/05/2008 |
| 7409162 | Timing error reduction in QKD systems Systems and methods for reducing or eliminating timing errors in a quantum key distribution (QKD) system (100) are disclosed. The QKD system has a pulse generator with retimer (PGRT) that includes a field-programmable gate array (FPGA) (or FPGA output) which ... | 08/05/2008 |
| 7398022 | Optical return-to-zero phase-shift keying with improved transmitters An apparatus and a method for transmitting at least a digital optical signal with return-to-zero phase-shift keying, employing a single optical modulator with dual-drive design, the encoded optical signal having improved spectral efficiency and performances and bein... | 07/08/2008 |
| 7391975 | Method of synchronizing servo timing in an optical wireless link A technique for synchronizing the servo control systems between two optical wireless links (OWLs) that are in communication with one another. This synchronization allows the alignment in time of the various tasks to be assigned in a desired time period. The synchron... | 06/24/2008 |
| 7379672 | Photonic RF distribution system The present photonic RF generation and distribution system provides a system and method for distributing an RF output signal. The photonic RF distribution system includes two optical sources for generating optical signals. A first optical source (42) is opera... | 05/27/2008 |
| 7376354 | All optical clock recovery All optical clock recovery includes a transmitter for generating an optical timing signal. The transmitter includes a semiconductor laser for the production of a dynamically synchronizable timing signal, the laser having an external resonator for feedback of the tim... | 05/20/2008 |
| 7359396 | Optical-core network with selective signal queueing A core network shared by a large number of edge nodes comprises core nodes interconnected by core channels. Selected core channels are provided with buffers to enable temporal alignment of signals arriving at any core node from several other core nodes. A buffer may... | 04/15/2008 |
| 7340186 | Discrimination phase margin monitor circuit, transmitting/receiving device and communication system The discrimination phase margin monitor circuit (10) of the present invention comprises a first discrimination circuit (11 and 12) discriminating an input data signal using a clock signal extracted from the input data signal, a second discrimina... | 03/04/2008 |
