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| Number | Title | Issue Date |
| 8081882 | Optical high-rate pulse position modulation scheme and optical communications system based thereon It is an object of the present invention to provide a communications system for communication between two remote terminals, where even at very long distances between these two terminals and/or at very small signal-to-noise ratios a robust communication is possible. ... | 12/20/2011 |
| 8078062 | Carrier-suppressed optical pulse train generating device and method The device is structured to have a first electric modulation signal generator, a second electric modulation signal generator, a two-mode beat light source and an optical intensity modulator. The first electric modulation signal generator generates and outputs a firs... | 12/13/2011 |
| 8027592 | Infrared remote control signaling generator An IR signaling generator and method divides the functionality of generation between software and hardware to provide a flexible way to generate IR signals, such as remote control signals. The hardware includes a clock generator for generating a carrier clock signal... | 09/27/2011 |
| 7881620 | Stabilized optical fiber continuum frequency combs using post-processed highly nonlinear fibers An arrangement for generating beat notes with a relatively high signal-to-noise ratio (SNR) utilizes a pulsed laser source coupled into a section of post-processed highly-nonlinear optical fiber (HNLF) to generate a frequency comb having one or more regions of enhan... | 02/01/2011 |
| 7881619 | System and method of using variable pulses for symbology A method and system for storing and transmitting data using variable pulse characteristics to represent ASCII or UNICODE characters, of the value of a string of data using a number base higher than 2. Pulse characteristics are modified to correspond to different dat... | 02/01/2011 |
| 7715731 | Systems with spread-pulse modulation and nonlinear time domain equalization for fiber optic communication channels Embodiments of fiber optic communication systems are disclosed. In one embodiment, the system includes an optical channel having a channel response, a pulse-shaping transmitter coupled to a first end of the optical channel, and a receiver coupled to a second end of ... | 05/11/2010 |
| 7689132 | Interference-rejection coding method for an optical wireless communication system and the optical wireless communication system thereof An interference-rejection coding method for an optical wireless communication system and such an optical wireless communication system are provided. The coding method uses delay modulation, block code techniques and filtering to reduce the low frequency interference... | 03/30/2010 |
| 7574144 | Spectrally phase encoded optical code division multiple access system System and method for transmitting and receiving encoded signals over a network along with one or more additional signals transported within a spectral gap created by the coded signals. ... | 08/11/2009 |
| 7561808 | System and method of using variable pulses for symbology A method and system for storing and transmitting data using variable pulse symbology over a fiber optic or ultra wide band system. Data is stored in memory, accessed and transformed into an electronic or photonic pulse and/or space which has a variable duration, the... | 07/14/2009 |
| 7542684 | Light emitting diode driving device and optical transmission device including the same A light emitting diode driving device for driving an LED includes (i) a driving pulse current generating circuit for generating a driving current for the LED in accordance with a driving pulse signal supplied from outside and (ii) a differentiating circuit for gener... | 06/02/2009 |
| 7505693 | Miniature waveform modulator with full pulse by pulse timing control A miniature waveform modulator is provided to modulate an infrared laser. The miniature waveform modulator outputs a pulse train having different and specified pulse widths, with the pulse train used to modulate the laser. In one embodiment, the pulse train extends ... | 03/17/2009 |
| 7447444 | Light source in optical transmission system, waveform shaper, optical pulse train generator, and optical reproduction system The present invention provides a pulse train generator comprising: a dual-frequency signal light source for generating a dual-frequency signal; a soliton shaper for soliton-shaping output light from the dual-frequency signal light source; and an adiabatic soliton co... | 11/04/2008 |
| 7430376 | All-optical delay generator for PPM communication systems based on a non-linear waveguide with a chirped DBR An all-optical PPM modulator comprises one or more sources of trains of optical control pulses and optical signal pulses, the optical control and optical signal pulses being equally spaced, but differentiated from one another by at least having different optical wav... | 09/30/2008 |
| 7421204 | Method and system for increasing the spectral efficiency of binary coded digital signals A method and system for increasing the spectral efficiency of binary coded signals includes encoding an input binary bit sequence such that the input binary bit sequence is converted into a series of rectangular pulses having varying repetition rates. A continuous w... | 09/02/2008 |
| 7415212 | Data communication system, data transmitter and data receiver A transmitter formed of two or more light-emitting sections such as LEDs, which are physically arranged in a predetermined manner, is disposed in the real world object, and each light-emitting section transmits data by flashing at a flashing pattern representing the... | 08/19/2008 |
| 7412173 | Apparatus for generating optical carrier suppressed return-to-zero An apparatus for generating a Carrier-Suppressed Return-to-Zero (CS-RZ) signal is disclosed. The apparatus includes a mixer, a Low Pass Filter (LPF), a driver amplifier and a single external modulator. The mixer generates a modulator input by mixing data with a half... | 08/12/2008 |
| 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 |
| 7398023 | Method and apparatus for bias and alignment control in an optical signal transmitter A method and apparatus for controlling bias and alignment in an optical signal transmitter for providing intensity modulation and DPSK modulation to an optical signal, e.g. in an RZ-DPSK modulation format. Output power in dither signals applied to the bias signals m... | 07/08/2008 |
| 7376358 | Location specific optical monitoring An optical spike is generated at an arbitrarily selected location within an arbitrary optical link. The optical spike is generated by deriving a spike signal having a plurality of components, and launching the spike signal into the a transmitter end of the optical l... | 05/20/2008 |
| 7376357 | System and method of using variable pulses for symbology A method and system for storing and transmitting data using variable pulse symbology over a fiber optic or ultra wide band system. Data is stored in memory, accessed and transformed into an electronic or photonic pulse and/or space which has a variable duration, the... | 05/20/2008 |
| 7362976 | Generating of high rate modulated pulse streams The present invention provides an all optical system for generating high rate modulated signals including: a generator for generating a first periodic signal at a first rate; an optical chopping device arranged to receive the first periodic signal for producing a se... | 04/22/2008 |
| 7356256 | Digital performance monitoring for an optical communications system A digital performance monitoring method and system for an optical communications system utilizes a channel monitor and a digital signal processor (DSP). The channel monitor is designed to monitor a respective channel signal of the optical communications system, and ... | 04/08/2008 |
| 7352824 | Multilevel pulse position modulation for efficient fiber optic communication Decreasing the average transmitted power in an optical fiber communication channel using multilevel amplitude modulation in conjunction with Pulse Position Modulation (PPM). This multilevel PPM method does not entail any tradeoff between decreased power per channel ... | 04/01/2008 |
| 7349347 | ASK communication device An ASK communication device includes a master station and slave stations connected to the master station through a bus line. The master station includes a transmission unit for ASK-modulating a carrier signal outputted from an oscillation circuit owned thereby and o... | 03/25/2008 |
| 7340183 | Optical communications systems, devices, and methods A method of transmitting an optical communications signal, comprising receiving a first signal, encoding the signal with a differential or duobinary encoding scheme, encoding the signal with an oscillating signal component, and sub-carrier modulating the signal onto... | 03/04/2008 |
| 7340182 | Multiplexer A multiplexer includes an encoder. The encoder includes: flip-flop circuits that output two signals having a transmission rate of B/2 at a frequency of B/2, while holding signals of each signal; an adder that adds the respective signals output from the flip-flop cir... | 03/04/2008 |
| 7333736 | Method and apparatus for controlling modulator phase alignment in a transmitter of an optical communications system A method and apparatus for controlling phase alignment in a modulator of a transmitter in an optical communications system utilizes an RF power signature to tune phase alignment. A portion of the optical signal is tapped and converted to an electrical signal. An ele... | 02/19/2008 |
| 7330662 | System and method for remote optical digital networking of computing devices The extended range of optical data communication is enabled through the use of intermediary relay stations spaced fairly far apart. IRDA communicatiOn, as is well known, uses very short duration optical pulses to send data up to 1 Mbit/sec; this has the concomitant ... | 02/12/2008 |
| 7324760 | Apparatus and method for phase synchronization control in RZ optical transmitter An optical RZ transmitter comprises an optical signal source and a pair of electro-optical modulators in tandem, one arranged to receive a NRZ electrical data signal and the other a clock signal at the data rate of the data signal. The phase difference between the d... | 01/29/2008 |
| 7321731 | Optical pulse position modulation discriminator Systems and methods are disclosed herein to provide various optical techniques. For example, in accordance with an embodiment of the present invention, a pulse position modulation discriminator architecture is disclosed for discriminating temporal positions of PPM-e... | 01/22/2008 |
| 7292792 | High speed modulation of optical subcarriers A method for transmitting digital data includes splitting a coherent optical carrier having a subcarrier into mutually coherent optical carriers, producing corresponding sequences of phase shifts in each of the mutually coherent optical carriers, and then, interferi... | 11/06/2007 |
| 7287213 | Method and system to provide modular parallel precoding in optical duobinary transmission systems A circuit using modular based parallel processing calculates the cumulative parity of a binary number input sequence. The circuit is used, for example, to implement a precoder for an optical duobinary transmission system. The design permits a relatively low-speed ci... | 10/23/2007 |
| 7277647 | System and method of optical transmission Minimum shift keying (MSK) is used as the coding scheme in a high bit rate optical transmission system, and the signal format is either RZ (return-to-zero) or NRZ (non-return-to-zero). The system can combine multiple individual channels with different wavelengths in... | 10/02/2007 |
| 7274878 | Dispersion compensation method in optical communication system having optical add drop multiplexing capability Dispersion compensation values are set so as to be transmittable to any path groups in a WDM optical communication system having OADM nodes, which includes transmitting-end and receiving-end terminal nodes; a WDM optical communication transmission line including a p... | 09/25/2007 |
| 7266311 | Control of delay line interferometer The delay setting of an optical delay line interferometer (DLI) used to decode differentially encoded phase shift keyed signals (DPSK or DQPSK) is controlled using a control signal representative of the ratio Perr2/Perr1 of the rate of occurren... | 09/04/2007 |
| 7266301 | Interference resistant repeater systems including controller units A repeater unit is provided that includes a receiver module and a controller unit. The receiver module is responsive to an infrared signal. The controller unit is adapted to determine whether a signal based on the infrared signal corresponds to a remote control sign... | 09/04/2007 |
| 7260413 | Data transmission system having a high data transmission rate and method of transmitting the data A data transmission system has a base station and at least one mobile station. Data packets are interchanged between the base station and the mobile station using a time slot method. In this case, first measures are used for transmission of a first part of a data pa... | 08/21/2007 |
| 7257332 | Optical transmitter and its control method An optical transmitter comprises an amplitude modulation unit performing amplitude modulation of only a one-side amplitude of a main signal with a low-frequency signal having a predetermined frequency. An optical modulator receives an input signal generated after th... | 08/14/2007 |
| 7251417 | Method and apparatus for optimization of dispersion-managed return-to-zero transmission by employing optical pulses having variable widths A method and apparatus for transmitting optical pulses in a dispersion-managed optical transmission system comprises determining the pulse width of optical pulses in a optical transmission channel in accordance with the path-average dispersion (PAD) experienced by t... | 07/31/2007 |
| 7233725 | 1×N fanout waveguide photodetector A 1×N fanout waveguide detector is disclosed. The detector includes a multiple-mode interference (MMI) cavity with input and output ends. A single-mode waveguide is optically coupled to the input end of the MMI cavity so that the optical power in the guided mode is... | 06/19/2007 |
