Did You Know...
...that Robert Adler has the dubious distinction of being the Father of the Couch Potato? Back in 1955 Adler was employed by what was then Zenith Radio Corp., where he was charged to invent something that would allow viewers to turn down the TV volume without leaving their chairs. After a series of flops (such as a wired contraption that people tripped over), Adler hit on the idea of using sound waves. Thus the Remote Control was born...
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| Number | Title | Issue Date |
| 8165473 | Optical-time-division-multiplexing differential phase shift keying signal generating apparatus An apparatus detecting an optical carrier phase difference between adjacent optical pulses structuring an OTDM-DPSK signal, by generally-used optical and electrical elements, is provided. An OTDM-DPSK signal generating section has an optical splitter, a first phase ... | 04/24/2012 |
| 8139953 | Signal transmission device, signal reception device, test module, and semiconductor chip There is provided a signal transmission device which transmits, in the form of an optical signal, multivalued data which shifts through three or more plurality of logical values, and includes: a light emitting element which outputs light having an intensity correspo... | 03/20/2012 |
| 8135287 | 100 Gbit/s OFDM optical signal generation A method includes modulating lightwaves to provide first and second OFDM signal sidebands at a first polarization direction and first and second OFDM signal sidebands at a second polarization direction, and combining sidebands that are oppositely positioned and join... | 03/13/2012 |
| 8135286 | Method of providing duplex optical communications and optical modulator therefor Methods of providing duplex free-space optical, communication comprising receiving a time-shift keying (TSK) encoded signal and selectively re-modulating—and optionally retro-reflecting —received TSK pulses so as to transmit an on-off keying (OOK) signal wherein... | 03/13/2012 |
| 8112002 | Transmitting circuit and complementary optical wiring system A transmitting circuit has a first transmitter configured to generate a first electric pulse signal in synchronization with a rising edge of a digital electric input signal, a second transmitter configured to generate a second electric pulse signal in synchronizatio... | 02/07/2012 |
| 8103173 | Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matche... | 01/24/2012 |
| 8098997 | Optical modulator and optical transmitter A reduction in size and cost of an optical modulator is achieved with a simple configuration, while improving the modulation characteristics. An optical modulator modulates light branched by an optical coupler and then couples the light via the optical coupler. The ... | 01/17/2012 |
| 8098996 | Adaptable duobinary generating filters, transmitters, systems and methods A variety of adaptable electronic duobinary generating filters to be used in communication systems are provided, each filter generating an adaptable electronic duobinay signal which is optimized for system impairments. According to one exemplary implementation, an a... | 01/17/2012 |
| 8059968 | Modulation device for generating optical signal with quadruple frequency and method thereof The present invention discloses a modulation device for generating an optical signal with quadruple frequency and the modulation method thereof. The modulation device in the present invention utilizes a commercial integrated modulator, a RF signal generator and a ph... | 11/15/2011 |
| 8059969 | Enhanced linearity RF photonic link A method and apparatus for modulating an RF signal. The RF signal is supplied to a grating modulator having a grating, and light of at least a first wavelength is supplied as a first optical carrier to the grating modulator. The first carrier light is modulated by t... | 11/15/2011 |
| 8032034 | Optical code communication system An optical code communication system comprises an optical transmitter, an optical receiver, and an optical transmission line. The optical receiver has an optical mixing decoder for mixing a coded light and a local light, dividing the mixed light into an object optic... | 10/04/2011 |
| 8009995 | Method and apparatus for photonic digital-to-analog conversion A method and apparatus for receiving a digital signal having a plurality of significant bits of resolution. The apparatus includes a mode locked laser comprising a single output. The apparatus also includes a beam divider operable to receive the single output. The a... | 08/30/2011 |
| 7983569 | High-speed transmission system for optical channels A method and apparatus for transmission of data on bandwidth limited fiber optic channels. A multilevel signaling alphabet having multiple levels of optical intensity are used to transmit signals on optical channels. In order to counteract the decrease in signal to ... | 07/19/2011 |
| 7983570 | Direct detection differential polarization-phase-shift keying for high spectral efficiency optical communication Efficient apparatus, methods, systems and devices to generate, transmit and detect optical differential polarization-phase-shift keying signals are disclosed for high spectral efficiency optical communication systems. It includes an electrical encoder and an optical... | 07/19/2011 |
| 7933524 | Apparatus for and method of generating millimeter waves Provided are an apparatus for and a method of generating millimeter waves, in which millimeter-wave generation and frequency up-conversion can be achieved at the same time using a single device. The apparatus includes a mode-locking laser diode (LD) which has a dist... | 04/26/2011 |
| 7873284 | Quadrature amplitude modulation of optical carriers An apparatus includes an optical splitter, an optical combiner, first and second optical paths, and a digital signal generator. The optical splitter has an input port and first and second output ports. The optical combiner has first and second input ports and an out... | 01/18/2011 |
| 7865085 | Optical transmitting device, optical transmission system, optical transmitting method and optical transmission method In an optical transmission system by frequency-division multiplexing, the interference due to distortions of a first signal against a second signal can be reduced. In the optical transmission system where a modulated optical signal by the first signal is further mod... | 01/04/2011 |
| 7853153 | Fourth harmonic generating system using optical double side-band suppressed carrier modulator The present invention is to provide an optical modulating system for generating a signal of a frequency (f0+2fm) and a signal of a frequency (f0−2fm) and suppressing a signal of a frequency (f0) by a DSB-SC mo... | 12/14/2010 |
| 7848658 | Modulation scheme for tedons A system and method for increasing transmission distance and/or transmission data rates using tedons and an encoding scheme to reduce the number of ones in a data signal is described. For example, the method for increasing transmission distance and transmission data... | 12/07/2010 |
| 7817922 | Apparatus and method to generate carrier suppressed-return to zero optical signal Provided are an apparatus and a method for generating a CS-RZ optical signal. The apparatus includes: a classifier distributing an input signal into two NRZ (non-return-to-zero) signals with an identical transmission speed; a first signal transformer converting one ... | 10/19/2010 |
| 7813651 | Tunable radio frequency and microwave photonic filters RF and microwave devices and techniques are disclosed for processing RF and microwave signals by using (1) photonic or optical components and (2) RF and microwave components. In some implementations, a part of the processing is performed in the RF and microwave doma... | 10/12/2010 |
| 7792433 | System and method for generating optical return-to-zero signals with differential bi-phase shift and frequency chirp A system and method for generating an optical return-to-zero signal. The system includes an electro-optical conversion system. The electro-optical conversion system is configured to receive an input electrical non-return-to-zero signal, process information associate... | 09/07/2010 |
| 7778553 | Optical transmitter In an optical transmitter of the invention, continuous light from a light source is a (CS)RZ-D(Q)PSK modulated by two optical modulators connected in series, and a part of the optical signal output from a post-stage optical modulator is branched by an output monitor... | 08/17/2010 |
| 7778552 | Directly modulated laser with integrated optical filter An integrated optical source includes a Directly Modulated Laser (DML) and a filter which is positioned with the DML on a common substrate. The filter is configured to receive an input signal in the form of a modulated chirped optical signal. The filter is further c... | 08/17/2010 |
| 7751724 | Optical modulator An optical modulator is provided which includes: an optical splitting part that splits an input light wave into two light waves; two optical waveguides that propagate the two light waves into which the input light wave is split, respectively; a first SSB modulating ... | 07/06/2010 |
| 7747174 | Multi-channel fabry-perot laser transmitters and methods of generating multiple modulated optical signals Multi-channel Fabry-Perot laser transmitters and methods of generating multiple modulated optical signals are described. In one aspect, an optical transmitter includes a Fabry-Perot (FP) laser, an optical isolator, an optical splitter, and multiple electroabsorption... | 06/29/2010 |
| 7742704 | Visible light control apparatus, visible light control circuit, visible light communication apparatus, and visible light control method There is provided a visible light control apparatus including: a modulation unit (corresponding to a PPM signal generation circuit, a subcarrier generation circuit, and a first AND circuit) that modulates a subcarrier and thereby generates a modulated signal; a visi... | 06/22/2010 |
| 7720391 | System and method for generating optical return-to-zero signals with alternating bi-phase shift A system and method for generating an optical return-to-zero signal. The system includes a bit separator configured to receive an electrical non-return-to-zero signal and generate a first signal and a second signal, and a driver configured to receive the first signa... | 05/18/2010 |
| 7715729 | Apparatus and method for generating an optical single sideband signal A single sideband signal is generated from an input optical signal. An optical phase modulator performs optical phase modulation on the input optical signal in accordance with a control signal to produce the single sideband signal. A converter converts the input opt... | 05/11/2010 |
| 7706694 | Processor for entangled complex signals A system for and method of processing complex signals encoded into quantum states is presented. According to an embodiment of the invention, polarized components of a pump laser beam are separated and respectively modulated with first and second signals. The modulat... | 04/27/2010 |
| 7702245 | Spread spectrum in-band utility communication channel Utility data modulation is superimposed on a payload data modulator optical signal by exploiting spread spectrum techniques by virtue of one embodiment of the present invention. Utility data transmission rates of e.g., 200 Kbps, can be achieved without impairment to... | 04/20/2010 |
| 7680420 | Optical E-field modulation using a directly driven laser A method of synthesizing a modulated optical signal using a laser cascaded with an amplitude modulator. A phase drive signal VF(t) is derived for driving the laser to generate an optical carrier signal with a desired phase φ(t). An amplitude drive signal... | 03/16/2010 |
| 7672597 | Optical transmitter with external modulator, optical transceiver including optical transmitter with external modulator, and methods of driving the same An optical transmitter with an external modulator includes a light-emitting unit emitting a continuous wave light, a modulation unit modulating the continuous wave light in accordance with an electric signal, a first terminal applying a first positive voltage to a c... | 03/02/2010 |
| 7657189 | Optical link A system having a first optical modulator operates in a non-linear region thereof and fed by: an input radio frequency signal; and, a first optical frequency signal having a wavelength λ2. A second optical modulator operates in a linear region thereof an... | 02/02/2010 |
| 7650080 | Method and apparatus for waveform generation A spread spectrum waveform generator has a photonic oscillator and an optical heterodyne synthesizer. The photonic oscillator is a multi-tone optical comb generator for generating a series of RF comb lines on an optical carrier. The optical heterodyne synthesizer in... | 01/19/2010 |
| 7643760 | Direct detection differential polarization-phase-shift keying for high spectral efficiency optical communication Efficient apparatus, methods, systems and devices to generate, transmit and detect optical differential polarization-phase-shift keying signals are disclosed for high spectral efficiency optical communication systems. It includes an electrical encoder and an optical... | 01/05/2010 |
| 7630650 | Multi-level modulation receiving device A multi-level modulation receiving device for adaptively compensating for chromatic dispersion and polarization mode dispersion with high precision. Each equalizing filter has at least one variable parameter as a weight therefor and equalizes the waveform of a corre... | 12/08/2009 |
| 7606501 | System and method for generating optical return-to-zero signals with alternating bi-phase shift and frequency chirp A system and method for generating an optical return-to-zero signal with frequency chirp. The system includes a bit separator configured to receive an electrical non-return-to-zero signal and generate a first input signal and a second input signal. Additionally, the... | 10/20/2009 |
| 7599627 | Method and system for a polarization mode dispersion tolerant optical homodyne detection system with optimized transmission modulation An optical homodyne communication system and method in which a side carrier is transmitted along with data bands in an optical data signal, and upon reception, the side carrier is boosted, shifted to the center of the data bands, and its polarization state is matche... | 10/06/2009 |
| 7599628 | Method for modulating an optical signal and optical transmitter A method for modulating an optical signal includes the following steps: modulating the intensity of the optical signal with a nonreturn-to-zero bit signal, and modulating the phase of the optical signal with a periodic phase-shift signal creating an alternating π-p... | 10/06/2009 |
