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| Number | Title | Issue Date |
| 7970032 | Method and device for reducing laser phase noise The present invention relates to a method and device for reducing the phase noise of a laser signal from a laser source. This device comprises a first current generator for supplying a driving current to the laser source in view of producing the laser signal. A phas... | 06/28/2011 |
| 7656917 | Circuit arrangement for generating light pulses A circuit arrangement for generating light pulses includes an electro-optical converter; a switching element; and a charge store. The electro-optical converter is connected to the charge store via the switching element. The closing of the switching element triggers ... | 02/02/2010 |
| 7590157 | Laser noise elimination circuit and optical disc device A laser noise elimination circuit raises the gain of a first TIA and at the same time reflected light from an optical disc of a laser beam is subjected to photoelectric conversion by means of a photo detector and a second TIA to obtain an RF signal. Then, the direct... | 09/15/2009 |
| 7471710 | Narrow linewidth semiconductor laser device A narrow linewidth semiconductor laser device has a semiconductor laser and a low noise current source operatively connected to the laser with the current source being adapted to prevent degradation of the laser's frequency noise spectrum. An optical frequency discr... | 12/30/2008 |
| 7411987 | System and method for using an output transformer for laser diode drivers A laser diode driver output stage for driving an associated laser diode device. The laser diode driver output stage includes a driver circuit adapted to receive an input data signal at an input node and provide an output signal to a positive output node and a negati... | 08/12/2008 |
| 7386023 | Systems and methods for reducing harmonics produced by oscillators Systems and methods for reducing the harmonic content of an oscillator are provided. More specifically, waveforms with reduced harmonics are provided, as are waveform generators for producing such waveforms. Such waveform generators can be used in or with a laser dr... | 06/10/2008 |
| 7361936 | Optical transmission and/or receiving device An optical transmitting and/or receiving device has a semiconductor component with a first contact for connecting to a reference voltage and a second contact for obtaining or supplying a high-frequency electrical signal. There is also an electrically conducting carr... | 04/22/2008 |
| 7263143 | System and method for statistically directing automatic gain control The present invention is directed to a system and method which statistically determines when regularly occurring interference events of a predictable duration will occur, for example radar pulses and dynamically adjusts an automatic gain control (AGC) for RF data tr... | 08/28/2007 |
| 7193957 | Light source drive, optical information recording apparatus, and optical information recording method A light source drive which modulates a light source so as to cause the same to emit a light, includes: a superposition current generation part which generates a superposition current approximately corresponding to a charging/discharging current needed for a capacita... | 03/20/2007 |
| 7184452 | Laser driver circuit for reducing electromagnetic interference A laser driver circuit for reducing electromagnetic interference is disclosed. The laser driver circuit includes a first differential amplifier circuit, a second differential amplifier circuit and a glitch smoothing circuit. The first differential amplifier circuit ... | 02/27/2007 |
| 7177331 | Laser diode module with a built-in high-frequency modulation IC A laser diode module with a built-in high-frequency modulation IC used to remove the reflected noise generated as the laser beam reads the signal to be played back and directly packaged within a metal cap. The high-frequency modulation IC creates an electrical conne... | 02/13/2007 |
| 7167378 | Circuit board transmitting high frequency signal At least one of a feedback path and a feed path is divided into two paths, and the divided feedback path and the feed path for feeding a signal form a twisted pattern to suppress radiation noise of a high frequency by a twisted pair effect. The other divided feedbac... | 01/23/2007 |
| 7158552 | Low relative intensity noise fiber grating type laser diode The dependency of intensity noise is used to determine the wavelength difference between a laser diode gain peak and a reflection peak of a fiber grating in a fiber grating type laser diode. Monitoring and determining the relative noise intensity of such a laser ena... | 01/02/2007 |
| 7149232 | Laser noise cancel circuit and optical disk device Disclosed herein is a laser noise cancel circuit for reducing laser noises in a reproduction system for an optical disk device including, a gain-variable amplifying noise cancel circuit for amplifying a monitor output signal for laser light, a first low-pass filter ... | 12/12/2006 |
| 7145929 | Driver circuit and method for driving an electronic component A driver circuit and a method drive an electronic component such as a laser diode with a variable electric current that is controlledly switched between at least two discrete current levels. The driver circuit includes circuit elements that damp ringing or initial t... | 12/05/2006 |
| 7079558 | Mode-locked laser method and apparatus A method and apparatus for stabilizing the output of a mode-locked laser by monitoring the temporal behavior of the pulse train profile and controlling the laser cavity optical length and/or loss modulation frequency accordingly. A mismatch of the cavity optical len... | 07/18/2006 |
| 7079460 | Optical power level-controlling device for stable oscillation of laser diode An optical power level-controlling device controls optical power level of a laser beam irradiated on an optical disk. The optical power level takes an ERASE (reference) level, a lower BIAS level and a higher WRITE level. Recording is performed by alternating the opt... | 07/18/2006 |
| 7054344 | Method and system for equalizing transmission line loss of a laser drive signal A circuit for equalizing transmission line loss of a laser drive signal includes a laser driver, a laser diode, and a transmission line for connecting the laser driver to the laser diode. The laser driver includes a differential pair of transistors, a modulation cur... | 05/30/2006 |
| 7003438 | Apparatus for correcting for the effects of laser noise Adaptive noise reduction techniques used in devices that pass light from a laser through a quantum medium such as a rubidium vapor cell. A CPT frequency standard that employs the techniques has a first channel in which the laser light passes through the quantum medi... | 02/21/2006 |
| 6949731 | Light-receiving module having a light-receiving device on a die-capacitor The present invention provides a light-receiving module that realized a reliable wire bonding from a light-receiving device to a die-capacitor on which the light-receiving device is mounted with adhesive. The light-receiving module of the present invention includes ... | 09/27/2005 |
| 6947456 | Open-loop laser driver having an integrated digital controller A laser driver for generating drive waveforms that are suitable for driving a single VCSEL or an array of VCSELs. A digital controller is integrated into the laser driver and is utilized to initially program and selectively adjust during the operation of the driver ... | 09/20/2005 |
| 6931040 | System and method for using an output transformer for laser diode drivers A laser diode driver output stage for driving an associated laser diode device. The laser diode driver output stage includes a driver circuit adapted to receive an input data signal at an input node and provide an output signal to a positive output node and a negati... | 08/16/2005 |
| 6907055 | Method and circuit for measuring the optical modulation amplitude (OMA) in the operating region of a laser diode A method and circuit for measuring the optical modulation amplitude in the operating region of a laser diode is described. The method utilises two measurements of OMA, each measurement being related to the slope in a specific portion of the operating region of the p... | 06/14/2005 |
| 6907052 | Tunable optical local oscillator A tunable optical local oscillator is used for optical heterodyne signal detection using an electrooptic Mach-Zehnder modulator to produce a rapidly tunable optical signal from a tunable RF frequency generator. A combination of the Mach-Zehnder modulator and optical... | 06/14/2005 |
| 6891868 | Laser driver with noise reduction feedback for optical storage applications In order to provide a low noise laser beam, a noise reducing feedback network is provided which creates a noise reducing signal and provides that signal to the laser itself. In order to produce the noise reducing signal, the operation of the laser is monitored and t... | 05/10/2005 |
| 6847665 | Semiconductor laser device and method for producing the same Not only a semiconductor laser element and a photodetector but also a capacitor connected to the photodetector is housed in a package to thereby reduce the distance from the capacitor to the photodetector so that power source noise is efficiently suppressed by the c... | 01/25/2005 |
| 6829268 | Synchronous servo control for a tunable laser Tunable laser systems use servo control loops to control and monitor laser parameters such as channel, temperature, and power. The many control loops operate asynchronously, which means that noise generated by input sampling and/or output updating from one or more l... | 12/07/2004 |
| 6771678 | Laser system and method of operation having improved signal continuity and safety An improved laser system and method of operation provides signal continuity and safety in the event of accidental interruption of the laser beam. At the transmitting end, a main laser generates a beam, which is surrounded by a low powered guard beam generated by a p... | 08/03/2004 |
| 6735229 | Ultralow noise optical clock for high speed sampling applications Methods and systems for using a laser type clock to produce a train of ultra-stable optical pulses. The methods and systems include generating an approximately 10 GHz ultralow noise pulse train from a harmonically modelocked laser having an intracavity Fabry-Perot e... | 05/11/2004 |
| 6661815 | Servo technique for concurrent wavelength locking and stimulated brillouin scattering suppression A servo technique for concurrently providing wavelength locking and stimulated Brillouin scattering (SBS) suppression in an external cavity laser. Respective wavelength locking and SBS suppression signals are generated by a controller and combined into a ... | 12/09/2003 |
| 6587490 | Low-noise current source driver for laser diodes A low-noise current source driver for a laser diode load is achieved by means of a current-regulated supply connected across the load, and a shunt regulator. The shunt regulator comprises a shunting element, a current sensing element for sensing current c... | 07/01/2003 |
| 6529536 | Laser drive circuit and recording apparatus using the same In a laser drive circuit for use in an optical disc recording and reproducing apparatus, a P-channel MOS transistor acting as a drive current source generates a drive current ILD depending on a setting current Ic. A P-channel MOS transistor act... | 03/04/2003 |
| 6188144 | Power supply unit for pulsed laser using magnetic switch A plurality of series circuits of saturable reactors and transferring capacitors are connected in parallel to a peaking capacitor, the plurality of saturable reactors are magnetically coupled, and saturable reactors for finely adjusting a transfer initiat... | 02/13/2001 |
| 6181718 | Electronically cooled semiconductor laser module with modified ground line inductance The invention provides a semiconductor laser module with an electronic cooling device prevented from experiencing a lowering of the optical frequency response characteristic level in a band used for public communications. By changing the inductance of the... | 01/30/2001 |
| 5923687 | Bandwidth enhancement and broadband noise reduction in injection-locked semiconductor lasers An injection-locked semiconductor laser process that improves the modulation bandwidth and reduces the broadband noise of an injection-locked semiconductor laser. Injection locking of a semiconductor laser can significantly improve its broadband modulatio... | 07/13/1999 |
| 5914974 | Method and apparatus for eliminating reflected energy due to stage mismatch in nonlinear magnetic compression modules A high voltage pulse power generating circuit capable of eliminating secondary pulses due to stage mismatch in the stages of its magnetic pulse compressor circuit is disclosed. The pulse generating circuit source comprises a high voltage charge storing el... | 06/22/1999 |
| 5524015 | Optical noise reduction circuitry for laser systems A servo controlled laser system is provided which provides a laser output beam having reduced optical noise. The laser system may be any type of laser system and preferably is an ion laser system. The servo controlled laser system includes a laser head pr... | 06/04/1996 |
| 5471492 | Broadband matching network A broadband matching network closely matches the output impedance of a broadband amplifier to the input impedance of a laser over a broad frequency band to facilitate efficient transfer of power therebetween. As a result, the broadband amplifier does not ... | 11/28/1995 |
| 5442648 | Noise rejection circuitry and laser system using the same A controller including a closed loop servo system for a laser, or other entity is capable of substantial reductions in predictable, periodic noise such as the line noise induced by the source of alternating current electrical power, and in random noise as... | 08/15/1995 |
| 5361161 | Variable spectral width optical noise source An optical noise source. An optical amplifier produces unpolarized optical noise by spontaneous emission. The optical noise is emitted from one side of the amplifier and filtered by a bandpass filter to attenuate any noise having a wavelength outside a de... | 11/01/1994 |
