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| Number | Title | Issue Date |
| 8165475 | Systems and methods for reducing clipping in multichannel modulated optical systems A system for reducing clipping may be used between a multichannel RF source and a laser to reduce or correct clipping that might occur in the laser as a result of negative spikes or peaks in a multichannel RF signal. The system generally includes a clipping correcti... | 04/24/2012 |
| 8131158 | Optical transmission circuit Provided is an optical transmission circuit capable of realizing a high-quality optical signal waveform with low power consumption. An optical transmission circuit (10) includes: a laser diode (800); a modulator (900) for supplying a differentia... | 03/06/2012 |
| 8121493 | Distortion compensation circuit and method based on orders of time dependent series of distortion signal A distortion compensation circuit compensates for distortion generated by one or more non-linear elements such as a laser device. The distortion compensation circuit may be used in an optical transmitter, such as a laser transmitter used for forward path CATV applic... | 02/21/2012 |
| 8086110 | Optical wavelength division multiplexing (WDM) system including adaptive cross-talk cancellation An optical communication system comprising a transmitter including a data register having a plurality of outputs, each output comprising a separate data channel, a plurality of signal processors, each signal processor corresponding to a data, a plurality of laser mo... | 12/27/2011 |
| 7899336 | Optical communications device and optical communications system In an optical communications device that generates picture optical signals and optical signals for data communication by wavelength division multiplexing, it is carried out to alter a signal pattern inserted between packet signals of the optical signals for data com... | 03/01/2011 |
| 7725043 | System and method for reducing interferometric distortion and relative intensity noise in directly modulated fiber optic links A laser transmitter with a feedback control loop for minimizing noise. The novel laser transmitter includes a laser, an external reflector adapted to form an extended cavity to the laser, and a feedback control loop adapted to detect noise in the laser and in accord... | 05/25/2010 |
| 7715732 | Bias-control for optical Mach-Zehnder modulators with voltage-induced optical absorption A bias-control circuit that provides operating point control for a Mach-Zehnder modulator experiencing optical absorption at their interferometric arms. The bias control circuit generates compensation signals that are used to counter the thermally induced index shif... | 05/11/2010 |
| 7676161 | Modulation E-field based control of a non-linear transmitter In a method of synthesizing an optical signal, a multi-bit digital representation of a desired optical E-field is generated. The multi-bit digital representation has a resolution of N1-bits, where N1 is an integer greater than 2. At least two analog drive signals ar... | 03/09/2010 |
| 7489879 | Laser device for optical data transmission A Laser device for optical packet data transmission in TDM-systems is provided. The device comprises a laser light source for outputting laser light beam and a laser driver for driving the laser light source; an optical modulator which receives and modulates the las... | 02/10/2009 |
| 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 ‘K’. A parallel digital image signal is converted into a serial digital signal on the basis of the clock ... | 10/21/2008 |
| 7424229 | Methods and apparatus for Raman crosstalk reduction via idle data pattern control Methods and apparatus are provided for reducing Raman crosstalk in a wavelength-division-multiplexing (WDM) optical fiber transmission system that transmits a multiplex of channels. Idle data is sent over one or more of the channels of the WDM system in order to mai... | 09/09/2008 |
| 7424228 | High dynamic range radio frequency to optical link A communication system includes an optical transmitter which is differentially driven and an optical receiver that outputs a differential signal. The optical transmitter creates the differential drive signal from an input signal and delivers the differential drive s... | 09/09/2008 |
| 7421209 | Optical wavelength multiplexing FSK modulation method An optical wavelength multiplexing frequency shift keying modulation system. The system includes an optical wavelength multiplexing signal acquisition unit for outputting an optical wavelength multiplexing signal. A n optical frequency shift keying modulation unit a... | 09/02/2008 |
| 7418206 | Control method of wavelength dispersion compensator, and wavelength dispersion compensator It is an object of the present invention to provide a control technique for reducing wavelength dependence of wavelength dispersion values and also for suppressing a change in wavelength transmission characteristic with a temperature variation or the like, in a VIPA... | 08/26/2008 |
| 7412174 | Method and apparatus for distortion control for optical transmitters A method of manufacturing an optical transmitter includes assembling a laser device on a module including a temperature sensor and a temperature controller. An optimum operating temperature of the laser to minimize optical distortion is determined at a temperature w... | 08/12/2008 |
| 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 |
| 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 |
| 7398021 | Optical transmitter and passive optical network using the same An optical transmitter including a multi-lambda source to output injection light consisting of a plurality of injection wavelengths in channels, a circulator having a first port, a second port, and a third port, the circulator receiving the injection light at the fi... | 07/08/2008 |
| 7382984 | Electrical domain compensation of optical dispersion in an optical communications system Optical dispersion imposed on a communications signal conveyed through an optical communications system is compensated by modulating the communications signal in the electrical domain. A compensation function is determined that substantially mitigates the chromatic ... | 06/03/2008 |
| 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 |
| 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 |
| 7373172 | Multi-protocol interchip interface An interface between radios supporting different air interfaces is disclosed that avoids some of the costs and disadvantages associated with inter-radio interfaces in the prior art. The present invention enables the needed coordination across multiple wireless proto... | 05/13/2008 |
| 7373091 | Multicasting optical switch fabric and method of detection based on novel heterodyne receiver The inventors propose herein a switch fabric architecture that allows broadcasting and fast channel access in the ns-range. In various embodiments of the present invention, 10 Gb/s receiver modules are based on a novel heterodyne receiver and detection technique, wh... | 05/13/2008 |
| 7366428 | Optical receiver An optical receiver includes a light-receiving part and a control part. The light-receiving part includes an APD, a PIN-PD, and a branching optical device. First signal light is incident on the light-receiving part and is divided into second signal light and third s... | 04/29/2008 |
| 7348843 | Predistortion linearizer using cascaded lower-order linearizers A predistortion linearizer for predistorting a radiofrequency (RF) signal includes a first third-order predistortion linearizer having an input for receiving the RF signal, and a second third-order predistortion linearizer connected in cascade with the first lineari... | 03/25/2008 |
| 7349637 | Optical transmitter with SBS suppression An optical transmitter and methods of generating an optical signal having SBS suppression are described. An optical transmitter having SBS suppression according to the present invention includes a signal generator that generates a SBS suppression signal. A laser gen... | 03/25/2008 |
| 7349635 | Method and apparatus for routing messages in hybridized optical/wireless networks Method and apparatus for routing messages in a network includes first filters to provide frequency-based message signals converted from an optically-based signal and mixers adapted to mix the frequency-based message signals with sub-carriers to generate frequency-ba... | 03/25/2008 |
| 7342950 | Tunable laser source with integrated optical modulator A tunable laser source (10) with an integrated optical modulator (20). The laser source (10) is a widely tunable semiconductor laser that is comprised of an active region on top of a thick low bandgap, waveguide layer (22), wherein both t... | 03/11/2008 |
| 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 |
| 7340184 | Linearized Optical Transmitter Using Feedback Control Apparatus and methods for linearizing an optical transmitter are described. A linearized optical transmitter according to the present invention includes a modulator bias voltage supply that biases an optical modulator. The optical modulator modulates an optical sign... | 03/04/2008 |
| 7336904 | Electro-magnetic interference reduction filter for an optical transceiver An optical transmit circuit that includes an electro-optic transducer driver and an electro-magnetic interference (“EMI”) reduction filter. The EMI reduction filter is coupled to an output terminal of the electro-optic transducer driver. This allows the EMI redu... | 02/26/2008 |
| 7330667 | Electrical compensation of optical impairments Optical impairments such as dispersion and fibre nonlinearity are compensated by generating a pre-distorted electrical signal at the transmitter. This signal is modulated onto a carrier signal, so that it is upconverted in frequency. This up converted signal is then... | 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 |
| 7321728 | Optical waveform for use in a DWDM optical network and systems for generating and processing same An optical signal occupying one or more wavelengths. An optical data signal on each wavelength is modulated with a respective overhead (dither) signal, resulting in a respective dithered optical signal. The amplitude of a particular overhead signal used to modulate ... | 01/22/2008 |
| 7321733 | Split-band optical transmission system and optical transmission method used therein An optical transmission system including an optical transmitting device and an optical receiving device. The optical transmitting device includes a data signal splitting section for splitting data signal information into at least two parts and generating at least tw... | 01/22/2008 |
| 7321734 | Digital synthesis of readily compensated optical signals A method and system for mitigating effects of dispersion in an optical link. A pair of digital sample streams are synthesized representing a target optical E-field having a spectrum selected such that the convolution of the spectrum with itself yields a signal havin... | 01/22/2008 |
| 7319427 | Frequency diverse array with independent modulation of frequency, amplitude, and phase Method and apparatus for a frequency diverse array. Radio frequency signals are generated and applied to a power divider network. A progressive frequency shift is applied to all radio frequency signals across all spatial channels. Amplitude weighting signals are app... | 01/15/2008 |
| 7308209 | Transmitter circuit comprising a light source and a communication system The invention concerns a transmitter circuit comprising a light source (20) and arranged to operate said light source (20) to transmit optical communication signals in response to balanced electric input signals from a first (11) and a second ( | 12/11/2007 |
| 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 |
| 7286771 | Multi-channel optical transmitter incorporating a tunable optical signal source and method for transmitting a multi-channel optical signal The multi-channel optical transmitter is composed of a tunable optical signal source, an optical multiplexer and an intensity reducer. The tunable optical signal source includes a tunable laser, and additionally includes an optical signal output through which it out... | 10/23/2007 |
