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| Number | Title | Issue Date |
| 8184991 | Ditherless optical modulator control A method of controlling the operating parameters of an optical modulator, without using a dither signal, is provided. Past operating parameters are compared to present operating parameters using a quality of modulation signal obtained by cross-correlating the data m... | 05/22/2012 |
| 8165476 | Optical phase locked loop A single sideband modulator uses a radio-frequency signal output by a voltage controlled oscillator to modulate a reference optical signal output by a local light source, thereby obtaining several sideband signals, and combines the sideband signals into a single rep... | 04/24/2012 |
| 8160456 | Bias controller for an optical modulator A bias controller for an optical modulator. The modulator includes a bias electrode that is operable when appropriately biased by an applied bias voltage to configure the modulator to operate at quadrature, and the bias controller includes: a generating arrangement ... | 04/17/2012 |
| 8145069 | Optical transmitter A signal Data1 and Data2 are output from a DQPSK signal source. The output signal is input to the modulator drivers 1 and 2 of the differential output. A drive signal is applied from the drivers 1 and 2 to a modulator, and m... | 03/27/2012 |
| 8116638 | Radio frequency (RF) signal receiver using optical processing and associated methods A signal receiver, such as an RF-matched filter receiver, includes an optical source (e.g. a mode-locked laser) providing an optical signal, and a first optical modulator to modulate the optical signal with a received RF signal and provide a modulated optical signal... | 02/14/2012 |
| 8112003 | Optical transmitter, operation controlling method for the same, and recording medium An optical transmitter according to an exemplary aspect of the present invention is an optical transmitter that includes a variable-wavelength light source and a modulator for modulating and outputting the output light of the variable-wavelength light source in acco... | 02/07/2012 |
| 8095018 | Quaternary phase modulator In a quaternary phase modulator including two phase modulators disposed in parallel and a phase adjuster that adjusts a phase difference when the outputs of the two phase modulators are combined, there are provided a second light source that introduces light propaga... | 01/10/2012 |
| 8068746 | Optimum DC bias for an electro-optic switch A method for balancing optical transmission for a first ON state and a second ON state of an electro-optic switch having an RF input port and a DC port, in one implementation, comprises the steps of associating a positive RF voltage with the first ON state of the el... | 11/29/2011 |
| 8059970 | Control system for a polar optical transmitter A method of controlling a polar optical transmitter comprising a dual-branch Mach-Zehnder (MZ) modulator driven by a pair of independent electrical drive signals. A cost function is provided which defines a relationship between a control parameter of the optical tra... | 11/15/2011 |
| 8023831 | Coherent RF-photonic link linearized via a negative feedback phase-tracking loop In one of many possible implementations and embodiments, a method is provided for providing linearized phase modulation and demodulation in an RF-photonic link. This includes phase modulating a photonic carrier signal in a signal arm using the RF input and using the... | 09/20/2011 |
| 7991299 | Optical transmitter with driving voltage control and method An exemplary aspect of the invention is an optical transmitter that emits a light signal, including: a light source; a Mach-Zehnder optical modulator; a modulator driver; a wavelength information holder; and a driving voltage controller, wherein the Mach-Zehnder opt... | 08/02/2011 |
| 7953328 | Optical DQPSK transmitter phase monitor and control An apparatus and a method for a I-Q quadrature modulation transmitter monitor a phase bias between an I branch and a Q branch of the I-Q quadrature modulation transmitter. The I-Q quadrature modulation transmitter includes the I-branch, the Q-branch equipped with a ... | 05/31/2011 |
| 7953329 | Optical communication apparatus and optical add/drop apparatus An apparatus comprising an optical modulator modulating a light in accordance with a modulation signal and an operating point of the optical modulator, to thereby output a modulated optical signal; and a controller controlling the operating point in accordance with ... | 05/31/2011 |
| 7945173 | Control apparatus and control method for optical modulator An object of the invention is to provide a control system in which the phase shift between drive signals of an optical modulator can be reliably detected and compensated by a simple configuration. To this end, a control apparatus of the invention, for an optical mod... | 05/17/2011 |
| 7925171 | Optical transmission apparatus An optical transmission apparatus according to the present invention comprises: a plurality of optical modulating sections serially connected to each other via optical fibers; driving sections corresponding to the optical modulating sections; delay amount varying se... | 04/12/2011 |
| 7903981 | Software-based electro-optic modulator bias control systems and methods The present invention provides a software-based electro-optic modulator bias control system resident in an optical transceiver including an electro-optic modulator that includes an optical-to-electrical converter including a transimpedance amplifier, an analog-to-di... | 03/08/2011 |
| 7899338 | Method and device for controlling bias of optical modulator A method and device for adequately controlling the DC bias of each of the optical modulating sections of an optical modulator even while the optical modulator is operating in normal mode and even with a simple structure. An optical modulator bias controller (B) for ... | 03/01/2011 |
| 7877020 | Coherent RF-photonic link linearized via a negative feedback phase-tracking loop In one of many possible implementations and embodiments, a method is provided for providing linearized phase modulation and demodulation in an RF-photonic link. This includes phase modulating a photonic carrier signal in a signal arm using the RF input and using the... | 01/25/2011 |
| 7853155 | Method for adjusting bias in optical transmitter with external modulator A method for operating an optical transmitter for transmission of an optical signal over a dispersive fiber optic media to a remote receiver. The method includes the steps of providing a respective bias level of a first RF signal and a second RF signal input to an o... | 12/14/2010 |
| 7840141 | Differential M phase-shift modulator The present invention is a miniaturized differential M phase-shift modulator (M=2n: n is 2 or more) in which a plurality of Mach-Zehnder type light modulators each adapted to output a DPSK-modulated signal light by applying a driving voltage signal are ar... | 11/23/2010 |
| 7831155 | Optical transmission device The present invention provides an optical transmission device 100 capable of solving the problem of an unnecessary residual sideband components to thereby obtain a high-quality optical intensity-modulated signal in a case where an SSB optical modulation secti... | 11/09/2010 |
| 7822348 | Adaptive pulse shape control A method, apparatus, and computer program product are provided for optimizing the pulse shape of optical signals output from an optical transmitter. The optical transmitter includes an optical modulator controlled by a bias voltage and a signal drive level, wherein ... | 10/26/2010 |
| 7813654 | Broadband linearization of photonic modulation using transversal equalization Transversal equalization is used to obtain broadband linearization of photonic modulation. A photonic link comprises a signal path and a feed-forward path. The feed-forward path includes an optical linearizer and a transversal equalizer connected with the optical li... | 10/12/2010 |
| 7783204 | Optical transmitter to suppress abrupt increase of driving current for laser diode during unstable APC loop and a method to control the same The present invention discloses an optical transmitter that provides a function to vary the rate of the increase of the bias and modulation currents and their practical values during the APC feedback loop is left unstable without prolonging this unstable period. The... | 08/24/2010 |
| 7734192 | Control apparatus and control method for optical modulator An object of the invention is to provide a control system in which the phase shift between drive signals of an optical modulator can be reliably detected and compensated by a simple configuration. To this end, a control apparatus of the invention, for an optical mod... | 06/08/2010 |
| 7729621 | Controlling a bias voltage for a Mach-Zehnder modulator In one embodiment, the present invention includes a controller coupled to an optical modulator to receive a dither signal, determine a difference between the dither signal and a previous dither signal, determine a derivative of the difference with respect to a bias ... | 06/01/2010 |
| 7720392 | Differential quadrature phase-shift modulator and method for setting driving voltage thereof The present invention is directed toward a method for setting a driving voltage of a differential quadrature phase-shift modulator, this method making signal quality superior in response to an individual difference in extinction ratio due to variations in manufactur... | 05/18/2010 |
| 7706696 | Pilot tone bias control A method and apparatus for dynamically compensating for phase deviations using two synchronous rectifiers in a quadrature constellation and a delay line. ... | 04/27/2010 |
| 7702246 | Optical label switching scheme employing differential phase-shift keying for payloads and intensity modulation for labels using a single optical modulator An optical label-switching method and apparatus in which a payload signal is modulated on an optical carrier through differential phase-shift keying (DPSK) by a Mach-Zehnder modulator (MZM), and a label signal is imposed on the DPSK signal by the same MZM through an... | 04/20/2010 |
| 7650082 | Optical communication transmitter, optical communication receiver, optical communication system, and communication apparatus In one inventive aspect, a transmitter is provided. In the transmitter, a modulator supplies an electrical current based on a digital transmission electrical signal to a white LED, which emits light including a plurality of wavelengths into the air. A light detector... | 01/19/2010 |
| 7639954 | Driver for an optical transmitter A modulation driver for delivering an output modulation current for driving an optical source of an optical transmitter, the output modulation current comprises a first modulation current region characterised with a first temperature gradient and a second modulation... | 12/29/2009 |
| 7630651 | Method and apparatus for controlling bias point of optical transmitter An optical transmitter includes: a modulating unit that modulates an optical signal based on an electric signal; a first detecting unit that detects a first variation width of a maximum output of the modulated optical signal; a second detecting unit that detects a s... | 12/08/2009 |
| 7577368 | Optical communication apparatus and optical add/drop apparatus An apparatus comprising an optical modulator modulating a light in accordance with a modulation signal and an operating point of the optical modulator, to thereby output a modulated optical signal; and a controller controlling the operating point in accordance with ... | 08/18/2009 |
| 7561810 | Optical communication apparatus An optical communication apparatus for controlling the operating point of an optical modulation unit appropriately. An adding unit adds a bias voltage and a pilot signal. An optical modulation unit modulates light by an electrical signal, performs further modulation... | 07/14/2009 |
| 7555226 | Automatic bias control for an optical modulator An automatic bias controller for an optical modulator is provided. The automatic bias controller comprises a driver for providing an electrical data signal to the modulator and a bias voltage source for providing a bias voltage to the modulator. A microprocessor pro... | 06/30/2009 |
| 7536112 | Optical transmission system An optical transmission system which provides bandwidth restricted optical signal comprises an input terminal (10) for accepting an electrical binary signal, an amplifier (12) for amplifying said electrical binary signal to the level requested for oper... | 05/19/2009 |
| 7532824 | Driving method of optical modulator, and optical transmitter and optical transmission system using same An object of the invention is to provide a driving method of an optical modulator, which enables long-distance transmission by effectively suppressing transmission waveform deterioration due to a wavelength dispersion characteristic of a transmission path, and an op... | 05/12/2009 |
| 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 |
| 7421210 | Optical transmission method and system An optical transmitter splits a linear polarization optical carrier into a TE wave and a TM wave. One of the TE wave and the TM wave is phase-modulated with a transmission data so as to generate a phase-modulated signal. The phase-modulated signal and the other one ... | 09/02/2008 |
| 7418211 | Control apparatus and control method for optical modulator An object of the invention is to provide a control system in which the phase shift between drive signals of an optical modulator can be reliably detected and compensated by a simple configuration. To this end, a control apparatus of the invention, for an optical mod... | 08/26/2008 |
