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| Number | Title | Issue Date |
| 8094692 | Modulation method, modulation program, recording medium, modulation device, and optical transmitter A modulation method according to the invention is applied to a modulation device in which a light source is driven by a differential signal while a modulation circuit and the light source are capacitively coupled. In the modulation method of the invention, when an a... | 01/10/2012 |
| 8023539 | Method for driving surface emitting semiconductor laser, optical transmission module, and handheld electronic device Provided is a method for driving a surface emitting semiconductor laser including an active region that generates light, a resonator structure disposed such that it sandwiches the active region, and a driving electrode that provides power to the active region. The s... | 09/20/2011 |
| 7965745 | RF and microwave receivers based on electro-optic optical whispering gallery mode resonators Among others, RF receivers based on whispering gallery mode resonators are described. In one aspect, a photonic RF device includes a laser that is tunable in response to a control signal and produces a laser beam at a laser frequency. The RF device includes a first ... | 06/21/2011 |
| 7961765 | Narrow surface corrugated grating Narrow surface corrugated gratings for integrated optical components and their method of manufacture. An embodiment includes a grating having a width narrower than a width of the waveguide on which the grating is formed. In accordance with certain embodiments of the... | 06/14/2011 |
| 7957437 | Multisectional laser Disclosed is a semiconductor laser in which the substrate comprises at least three independent functional sections in the direction of light wave propagation, said functional sections serving different functions and being individually triggered by means of electrode... | 06/07/2011 |
| 7929584 | Light source mode alignment device and method, passive optical network system A light source mode alignment device and method and a passive optical network system are provided. The device includes a laser and a temperature control unit connected to each other and further includes a signal processing unit. The laser converts an incident light ... | 04/19/2011 |
| 7907648 | Optical FM source based on intra-cavity phase and amplitude modulation in lasers A laser is disclosed including a gain section having a distributed feedback grating imposed thereon. An absorption section is embedded in the gain section such that the first and second portions of the distributed feedback grating extend on either side of the electr... | 03/15/2011 |
| 7848369 | Optical modulator drive circuit with integrated low power output bias voltage control A modulator drive circuit provides a modulator drive signal to modulate an optical signal for transport across a network infrastructure. The modulator drive circuit powered by an adjustable voltage source, such that the modulator drive signal is generated from a dat... | 12/07/2010 |
| 7813389 | Generating laser pulses of prescribed pulse shapes programmed through combination of separate electrical and optical modulators A programmable laser pulse combines electrical modulation of the pulse frequency and optical modulation of the pulse shape to form laser pulses of prescribed pulse shapes. A prescribed pulse shape features high peak power and low average power. The laser system disc... | 10/12/2010 |
| 7801189 | Cross modulation-based opto-electronic oscillator with tunable electro-optic optical whispering gallery mode resonator Examples and implementations of photonic devices and techniques based on whispering gallery mode resonators formed of electro-optic materials to effectuate cross modulation between whispering gallery modes of different polarizations in the resonators. ... | 09/21/2010 |
| 7773643 | Laser light generating apparatus A laser light generating apparatus includes a laser light source, a phase-modulator, a signal generating unit configured to generate a modulation signal applied to the phase-modulator, a first external resonator, a second external resonator disposed at the stage suc... | 08/10/2010 |
| 7746909 | Method and systems for optimizing laser and electro-absorption modulator performance for long-haul optical transmission The present invention provides a compact, low cost integrated continuous wave (CW) laser/electro-absorption (EA) modulator solution that supports the non-return to zero (NRZ) modulation format for long-haul optical transmission that results in high output extinction... | 06/29/2010 |
| 7742511 | Method and system for a pulsed laser source emitting shaped optical waveforms A laser system for processing a workpiece includes a tunable pulsed laser source having an output comprising a set of optical pulses. The tunable pulsed laser source includes a seed source, an optical circulator having a first port coupled to the seed source, a seco... | 06/22/2010 |
| 7724789 | Method and apparatus for optical mode multiplexing of multimode lasers and arrays According to methods and apparatus described herein, multimode laser source capable of emitting a diffraction-limited beam of various shapes (including single-lobe shape) can be realized. An optical apparatus for generating a such diffraction-limited beam comprises ... | 05/25/2010 |
| 7656914 | Directly-modulated diode lasers with reduced overshoot An optical signal is produced from a direct modulation resonant cavity device, such as directly-modulated diode laser having an electrode divided into multiple sections. Each section is driven with an electrical waveform such that a time delay is introduced between ... | 02/02/2010 |
| 7596156 | Laser A method of stabilising a laser in order to maintain the laser in SLM operation is disclosed. The resonator cavity of the laser is modulated by a modulation signal applied to a piezo-electric transducer 10 coupled to the output coupler 2 of the laser. ... | 09/29/2009 |
| 7545838 | Incoherent combination of laser beams A method of combining beams from a plurality of laser resonators includes frequency modulating the output of each of the lasers with one or more of the lasers frequency modulated out-of-phase with the others. The frequency modulated beams are directed along parallel... | 06/09/2009 |
| 7508852 | Passive mode-locked semiconductor laser diode, and optical clock signal extracting device To provide an optical clock signal extracting device with a simple configuration, by which an optical clock signal may be extracted without depending on the polarization direction of an input optical signal. A current is injected to a gain region 30 through a... | 03/24/2009 |
| 7502394 | System and method for modulating a semiconductor laser Both a system and method are provided for modulating the intensity of an output beam generated by semiconductor laser. The exemplary system includes a source of pulsating current connected to the laser that generates a pulsating beam of laser light, an external modu... | 03/10/2009 |
| 7489715 | Optimization of mode selection in a laser resonator The so-called single-longitudinal mode of operation of a tunable laser beam source requires active control of the band-pass filters mounted in the laser resonator. As a rule, this entails one, or a combination of several filter elements, as for example birefringent ... | 02/10/2009 |
| 7460571 | Laser control apparatus and control method thereof A laser control apparatus and control method thereof includes multiple laser elements, a photodetector for monitoring optical outputs of the laser elements, a modulation. circuit for modulating with respect to each laser element based on data, a first drive source f... | 12/02/2008 |
| 7447246 | Q-modulated semiconductor laser A Q-modulated semiconductor laser comprises an optical gain section and an electro-absorptive modulator section, separated by a vertically etched air gap acting as a partially reflecting mirror. The modulator section is placed inside an anti-resonant Fabry-Perot cav... | 11/04/2008 |
| 7443893 | Method and system for tunable pulsed laser source A tunable pulsed laser source comprising a seed source adapted to generate a seed signal and an optical circulator. The optical circulator includes a first port coupled to the seed source, a second port, and a third port. The laser source also includes an amplitude ... | 10/28/2008 |
| 7436871 | Method and device for performing wavelength modulation with Distributed Bragg Reflector (DBR) laser The present invention is directed to a method and system for providing phase modulated current to a semiconductor laser to control beam wavelength. A first current is received into a gain portion of the semiconductor laser and a second current is received into a DBR... | 10/14/2008 |
| 7436867 | Hermetically sealed external cavity laser system and method A laser apparatus in a hermetically sealed container and methods for hermetically sealing the laser. The laser apparatus comprising an external cavity laser and a modulator in a single hermetically sealed enclosure. ... | 10/14/2008 |
| 7433375 | Laser trim and compensation methodology for passively aligning optical transmitter A method embodiment of the invention includes a scheme for trimming and compensation of a laser emitter in a fiber optic link. A laser emitter is provided. Also a reference optical power value is determined using data models of laser emitter performance generated by... | 10/07/2008 |
| 7430229 | Opto-electronic device comprising an integrated laser and an integrated modulator and associated method of production The field of the invention is that of integrated optical emission devices comprising a laser emission section and a section for modulating the optical power emitted by the laser, also known as ILM devices, the acronym standing for Integrated Laser Modulator. The inv... | 09/30/2008 |
| 7428253 | Method and system for a pulsed laser source emitting shaped optical waveforms A tunable pulsed laser source includes a seed source adapted to generate a seed signal and an optical circulator having a first port coupled to the seed source, a second port, and a third port. The tunable pulsed laser source also includes a modulator driver adapted... | 09/23/2008 |
| 7425706 | Gamma-ray laser; induced gamma emission system and method A method for producing stimulated emission of gamma radiation comprising: 1] providing at least first and second gamma-radiation sources, both sources being in recoil-free first-excited nuclear levels and the second source being in... | 09/16/2008 |
| 7418015 | System and method for control of optical transmitter A system and method for controlling an optical transmitter. Proximate to startup of the optical transmitter, the laser bias to the optical transmitter is increased from a minimum to a setpoint according to a predefined function. After the laser bias setpoint is reac... | 08/26/2008 |
| 7400659 | Method and device for performing DBR laser wavelength modulation free of thermal effect The present invention is directed to a method and system for providing a three-level current scheme to a semiconductor laser to control beam wavelength and laser temperature. A first current is received into a gain section of the semiconductor laser and at least one... | 07/15/2008 |
| 7391797 | Integrated circuit for controlling a laser diode The invention relates to an integrated circuit for controlling a laser diode, comprising a signal input for receiving a data signal; a signal output for connection to the laser diode; a modulator for modulation of the data signal; a current infeed connected to the s... | 06/24/2008 |
| 7382811 | Optical device, laser beam source, laser apparatus and method of producing optical device After forming domain inverted layers 3 in an LiTaO3 substrate 1, an optical waveguide is formed. By performing low-temperature annealing for the optical wavelength conversion element thus formed, a stable proton exchange layer 8 is fo... | 06/03/2008 |
| 7379486 | Technique for optically pumping alkali-metal atoms using CPT resonances Systems and methods for optically pumping alkali-metal atoms using Coherence Population Trapping (CPT) resonances are disclosed. An illustrative push-pull optical pumping system for inducing CPT resonances in a resonance cell containing an admixture of alkali-metal ... | 05/27/2008 |
| 7376161 | Modulation light source, image display apparatus including the same, and method of driving modulation light source A modulation light source capable of maintaining thermal stability of a gain part is provided. A modulation light source includes a DBR laser having a DBR part, a phase part and a gain part, a light wavelength conversion device that receives a fundamental wave from ... | 05/20/2008 |
| 7372878 | Method and system for preventing excessive energy build-up in a laser cavity A method and system decrease the amount of undesired laser radiation reaching a workpiece from a laser having a laser cavity and a Q-switch. The laser operates at any given time in one of at least two modes. In a first mode the laser emits pulses at a PRF (pulse rep... | 05/13/2008 |
| 7372879 | Wavelength locker using modulator current and photodetector The wavelength of light emitted by a laser and modulated by a frequency response modulator is determined from the power of the emitted light and the current drawn by the modulator. From the temperature and current applied to the modulator and the optical power of th... | 05/13/2008 |
| 7370972 | Two-dimensional image display device In a two-dimensional image display device, speckle noise is reduced by a simple construction. A two-dimensional image display device for displaying an image by projecting coherent light onto a projection plane is provided with at least one coherent light source (... | 05/13/2008 |
| 7369591 | System for controlling peaking for a driver for a vertical-cavity surface-emitting laser A driver for a vertical-cavity surface emitting laser (VCSEL) is provided that includes a bias current source, a modulation source, and a peaking control circuit. The bias current source is operable to generate a bias current for the VCSEL and an output voltage. The... | 05/06/2008 |
| 7369290 | Modulator bias control Approaches to bias control are disclosed for an optical modulator that modulates an optical carrier with a data input signal. In one embodiment an electrical bias input signal provided to the modulator is adjusted based on a characteristic of the data input signal d... | 05/06/2008 |
