Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8121490 | Transponder unit, transponder unit control apparatus, transponder unit control method and recording medium recording transponder unit control program A transponder includes a CDR section that extracts clocks from an input signal, an oscillating section that can output various frequencies to the CDR section, a frequency instruction processing section that instructs the oscillating section to output an arbitrary fr... | 02/21/2012 |
| 8073337 | Optical clock recovery apparatus and method and birefringent medium An optical clock signal recovery apparatus includes a mode-locked semiconductor laser that generates an optical pulse train polarized in a first direction. Optical components of the apparatus transmit a component of an input optical signal polarized in a second dire... | 12/06/2011 |
| 8032033 | Synchronous optical bus providing communication between computer system components A synchronous optical bus system for communication between computer system components is described. In one example, the optical bus system is used for communication between a memory controller and memory devices optically coupled to an optical interconnect. Optical ... | 10/04/2011 |
| 8023829 | Demodulation of phase modulated fibre-optic sensor system signals Demodulation apparatus for demodulating phase-modulated signals comprises a quadrature signal generator (QSG) for generating in-phase (I) and quadrature-phase (Q) signals in response to an unmodulated input signal. The QSG provides fast frequency tracking of the inp... | 09/20/2011 |
| 8005370 | Reference clock rate detection for variable rate transceiver modules A system and method are provided for determining an optical signal frequency range in an optical/electrical transceiver. The method receives an optical receive signal having a non-predetermined data rate via a network interface, and also receives an electrical refer... | 08/23/2011 |
| 7978983 | Optical triggered self-timed clock generation A self-timed clock circuit and method of generating a self-timed clock circuit. The circuit includes means for charging a circuit node in response to an external reset signal; means for discharging the circuit node in response to a trigger signal generated by a phot... | 07/12/2011 |
| 7941054 | System for extracting a clock signal from optical signal including plural clock frequencies and a method therefor In a clock signal extraction system, an optical modulator modulates an input optical signal having its clock frequency equal to a first or second frequency with a modulation electrical signal having its frequency equal to the average of the first and second frequenc... | 05/10/2011 |
| 7933523 | Clock extracting apparatus A clock extracting apparatus is provided. In the clock apparatus, two frequency components are made to have an equal magnitude by adjusting a temperature and current applied to an FP LD, and a clock signal is extracted by beating the two frequency components having ... | 04/26/2011 |
| 7929866 | Passive optical network media access controller assisted clock recovery A system, method, and computer readable medium for passive optical network media access controller assisted clock recovery which enables an optical receiver to recover a clock phase of an incoming data stream from an optical network unit comprises collecting phase d... | 04/19/2011 |
| 7860400 | Serializer/deserializers for use in optoelectronic devices An optoelectronic device implements a serializer array circuit or multi-channel CDR circuit to reduce the cost and size of the circuit. An efficient serializer array circuit includes a plurality of serializer blocks sharing the functionality of a single CMU to clock... | 12/28/2010 |
| 7835649 | Optical data synchronization scheme Asynchronous optical data is aligned with synchronous convergence points in an optical packet switching system. The convergence points can be any place where data enters an optical packet switching element, buffer stage, switch fabric, etc. The arrival time for data... | 11/16/2010 |
| 7783200 | Method and apparatus for constant bit rate data transmission in an optical burst switching network A method, core node, ingress edge node, and egress edge node for matching a bit rate of data input into an optical burst switching network with that of data output from the optical burst switching network are provided. The method includes calculating a difference be... | 08/24/2010 |
| 7769301 | Optical code division multiplexing receiving device and time gate processing method in optical code division multiplexing receiving device Technology is provided in which, by performing time gate processing using a clock signal with time jitter suppressed, time and intensity fluctuations which in the prior art had been observed in auto-correlated signals after time gate processing are reduced. In a dec... | 08/03/2010 |
| 7761011 | Optical fiber communication link A communication includes an analog input configured to receive an analog signal. An analog to digital converter configured to provides a digital signal output based upon the analog input. A modulator is configured to modulate a laser based upon the digital signal th... | 07/20/2010 |
| 7751719 | Electrical generation of return-to-zero (RZ) data pattern with flexible duty cycle adjustment for optical transmission An electrical return to zero (RZ) encoder converts non-return to zero (NRZ) data, into of RZ data patterns with a flexibility for duty cycle adjustment so that any RZ data pattern may be provided for a specific application's need. A duty cycle of>50% or | 07/06/2010 |
| 7725038 | System and method for transporting unaltered optical data stream Embodiments of the invention provide systems, apparatuses, and methods for maintaining proper bit sequence as well as the rate at which the bits occur within the data stream, enabling the transport of an unaltered optical stream from one point to another. Bits of da... | 05/25/2010 |
| 7706693 | Optically transmitting apparatus, optically transmitting system and optically transmitting method This provides an optically transmitting apparatus, an optically transmitting system and an optically transmitting method. This receives an optical signal which is configured in accordance with any one frame format among a plurality of frame formats and includes at l... | 04/27/2010 |
| 7680418 | Multi-rate clock signal extracting method and multi-rate clock signal extracting device A multi-rate clock signal extracting device includes a light modulator, a photoelectric converter, a band-pass filter unit, a phase comparison unit, a bit rate changeover switch and a modulating electric signal generating unit. The light modulator modulates a light ... | 03/16/2010 |
| 7672596 | Optical receiver circuit applicable to multiple transmission rates An optical receiver circuit is provided which is able to receive optical signals having a variable transmission rate, without loss of data. The optical receiver circuit according to the present invention has a light-receiving section for converting an optical signal... | 03/02/2010 |
| 7646985 | Optical clock signal extraction device and optical clock signal extraction method The present invention is an optical clock signal extraction device, comprising first conversion means and second conversion means for enabling to extract an optical clock signal without depending on the polarization direction of an input optical signal. The first co... | 01/12/2010 |
| 7627252 | Clock recovery from an optical signal with dispersion impairments A method of recovering a clock signal from an optical signal received through an optical communications system. A digital sample stream is processed to generate a dispersion compensated signal. The dispersion compensated signal is then tapped to obtain upper side ba... | 12/01/2009 |
| 7623792 | Clock extracting method and apparatus thereof A clock extracting apparatus arranges bit intervals of a signal light train incident on a signal light processing section to have uneven periods, makes bit intervals between a predetermined signal light and signal lights adjacent to the predetermined signal light to... | 11/24/2009 |
| 7596324 | Apparatus for extracting optical clock using filters and amplifier and method for the same The present invention relates to an apparatus and method for extracting an optical clock using filters and an amplifier. The object of the present invention is to provide an extraction of neighboring frequency components using wavelength fixed optical filters and an... | 09/29/2009 |
| 7580640 | Method and apparatus for extracting optical clock signal An apparatus and method for extracting an optical clock signal are provided. The method includes splitting a predetermined polarization component from an input optical signal, selecting frequency components for clock signal extraction from the predetermined polariza... | 08/25/2009 |
| 7574143 | All-optical signal processing method and device A device for processing of an optical input signal includes at least a first data signal. A first optical resonator provides a reference signal by optical filtering of the optical input signal. The first optical resonator is matched with a predetermined reference wa... | 08/11/2009 |
| 7532822 | Clock recovery from an optical signal with polarization impairments A method of recovering a clock signal from an optical signal received through an optical communications system. A digital sample stream is processed to generate a dispersion compensated signal. The dispersion compensated signal is then tapped to obtain upper side ba... | 05/12/2009 |
| 7532821 | Apparatus for optical clock extraction Provided is an apparatus for an optical clock extraction, which is capable of providing high optical amplification rate and more efficient noise cancellation by using a Fabry-Perot (FP) filter and an optical amplifier. In the apparatus, an optical circulator changes... | 05/12/2009 |
| 7489873 | Optical signal retiming, reshaping, and reamplifying (3R) regeneration system having monolithically integrated Mach Zehnder interferometer and self-pulsating laser diode The 3R regeneration system for a retiming, reshaping, and reamplifying an optical signal includes: first and second input ports in which a connected optical signal is input; an interferometer including first and second branches formed on a substrate, split at a comm... | 02/10/2009 |
| 7486896 | Optical clock recovery The invention relates to clock recovery in optical communication systems. Optical clock frequencies are recovered from a plurality of optical channels by using a single optical resonator. The optical resonator is matched with the carrier frequencies and the sideband... | 02/03/2009 |
| 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 |
| 7440512 | Electrical signal regenerator An electrical signal regenerator including an equalizer and a clock data recovery circuit is provided. The clock data recovery circuit is selected when an input signal of a higher bitrate multiplex level is detected, but the clock data recovery circuit is bypassed w... | 10/21/2008 |
| 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 |
| 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 |
| 7397847 | Testing device for testing electronic device and testing method thereof A testing device for testing an electronic device is provided. The testing device includes: a deterministic jitter application unit for applying deterministic jitter to a given input signal without causing an amplitude modulation component and supplying the input si... | 07/08/2008 |
| 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 |
