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| Number | Title | Issue Date |
| 8036254 | Semiconductor laser driving circuit, and optical disc device and integrated circuit provided with semiconductor laser driving circuit The output voltage of a cathode drive-type semiconductor laser driving circuit is set to a minimum, power consumption by a driving circuit portion is suppressed, and the heat that is generated by the optical head or the optical disc device is reduced. In addition to... | 10/11/2011 |
| 7986720 | Circuit and method for driving light-emitting element and optical transmitter A circuit for driving a light-emitting element such as a laser diode LD has a boost circuit for boosting an input voltage to supply it to the light-emitting element, a photoreceptor such as a photodiode PD for monitoring light from the light-emitting element; and a ... | 07/26/2011 |
| 7957441 | Method and apparatus for resonant frequency waveform modulation A resonant modulator device and process are described that provide enhanced resonant frequency waveforms to electrical devices including, e.g., laser devices. Faster, larger, and more complex modulation waveforms are obtained than can be obtained by use of conventio... | 06/07/2011 |
| 7940824 | Laser diode driver architectures Laser diode driver architectures are disclosed. Some example current drivers are described, including a current channel to provide an output current. The current channel includes a current mirror with emitter degeneration, a startup transistor coupled to the current... | 05/10/2011 |
| 7912103 | Semiconductor laser driving circuit, light emitting device, and disk drive A semiconductor laser driving circuit has a circuit protection function at low temperature and includes a voltage current converter that converts an input voltage Vin, which is determined according to a desired light brightness of the semiconductor laser to be drive... | 03/22/2011 |
| 7907650 | Laser module, control method of the same, control data of the same, and control data generation method A laser module includes a semiconductor laser, an output optical system provided on an optical output side of the semiconductor laser, a temperature detecting element that detects a temperature of the output optical system; and an output controller that calculates a... | 03/15/2011 |
| 7869478 | Apparatus and method for maintaining constant extinction ratio of laser diode Provided are an apparatus and method for maintaining an constant extinction ratio of a laser diode (LD). The apparatus includes: an automatic power control circuit maintaining the constant optical power of the LD; a correlation deriver deriving correlations between ... | 01/11/2011 |
| 7869477 | System and method for developing high output power nanosecond range pulses from continuous wave semiconductor laser systems Continuous wave laser diodes are able to be operated so as to achieve a high power pulsed output by operationally exercising them using a subnanosecond input pulse having an IV (power) amplitude characteristic at or exceeding a particular derived power (IV) threshol... | 01/11/2011 |
| 7830936 | Calibration of laser systems A method for a laser system to compensate a variability of a signal converter in the laser system includes generating a temperature signal corresponding to a temperature of a laser and adjusting a signal of the signal converter based on at least the temperature sign... | 11/09/2010 |
| 7813393 | Semiconductor laser, light source device, lighting device, projector, and monitor device A light source device includes a semiconductor laser, and a drive circuit supplying the semiconductor laser with a pulsed drive current, and in the semiconductor laser, a laser emitting element and a free wheel diode are formed on the same substrate, and a cathode o... | 10/12/2010 |
| 7792167 | Light source driving apparatus and light source driving method A light source driving apparatus, which adjusts a bias current to be supplied so as to control intensity of a light source, comprises a power source which outputs a variable reference voltage; a light receiving unit which receives light output from the light source ... | 09/07/2010 |
| 7782917 | Laser driving circuit, optical pickup and recording/reading equipment Disclosed is a laser driving technique capable of reducing power consumption in a laser driving circuit to achieve reduced heat generation in an optical pickup of a recording/reading equipment for an optical disc. A base-voltage control circuit is connected to a bas... | 08/24/2010 |
| 7760781 | Current control mechanism for low voltage applications A current control mechanism for use in low power consumption circuits with limited headroom includes a differential transistor pair from whose collectors a current output is taken. The current output is a function of a reference voltage provided at bases of a refere... | 07/20/2010 |
| 7756173 | Laser diode driver with adaptive compliance voltage A laser diode driver with means for adjusting the compliance voltage to allow a current source to accurately reproduce a current command while simultaneously minimizing the power dissipation of the current source. For a slowly-varying or DC current command, the comp... | 07/13/2010 |
| 7751453 | Method and apparatus for laser control in a two chamber gas discharge laser A laser control system contains an oscillator gas chamber and an amplifier gas chamber. A first voltage input is operatively connected to deliver electrical pulses to a first pair of electrodes within the oscillator gas chamber and a second pair of electrodes within... | 07/06/2010 |
| 7720120 | Method and apparatus for laser control in a two chamber gas discharge laser A laser control system contains an oscillator gas chamber and an amplifier gas chamber. A first voltage input is operatively connected to deliver electrical pulses to a first pair of electrodes within the oscillator gas chamber and a second pair of electrodes within... | 05/18/2010 |
| 7680167 | Method and system for detection of regions of instability in multi-section tunable lasers This invention relates to a method and system to detect hysteresis/unstable regions of multi-section lasers. The method comprises the steps of obtaining a first set of measurement values for the output of the laser diode by increasing a first current through a range... | 03/16/2010 |
| 7668216 | Coherence reduction of diode lasers The invention provides a method of reducing a time-averaged coherence of laser radiation for current-tunable lasers, and a laser apparatus realizing the method, by modulating the laser drive current using a modulation function optimized for obtaining a pre-determine... | 02/23/2010 |
| 7653102 | Method and apparatus for controlling output power levels of a laser used for optical data transmission based on data rate-speed optical feedback High-speed measurements of the output power level of a laser are obtained by using a high-speed laser output power monitoring device that is capable of producing an electrical feedback signal having an amplitude that varies as the output power level of the laser var... | 01/26/2010 |
| 7643525 | Current driver and power control for electrophotographic devices A laser driver comprises a plurality of current sources, including at least one bias current source and at least two drive current sources. To control the laser driver, a set of operating states is defined where each operating state corresponds to a desired laser ou... | 01/05/2010 |
| 7636377 | Optical disc recorder laser power control The present invention is directed to an optical disc recorder laser power control apparatus utilizing two different current sources to solve the problem caused by the contradiction between control resolution and control range. The first current source and the second... | 12/22/2009 |
| 7573923 | Laser drive circuit and method providing high limit clipping corresponding to low limit clipping in a laser A laser drive circuit may be used to induce high limit clipping corresponding to natural low limit clipping in a laser, such as a laser diode, to reduce even order distortion such as composite second order (CSO) distortion. A drive current input may be provided to t... | 08/11/2009 |
| 7532653 | Laser turn-on accelerator independent of bias control loop bandwidth An accelerator circuit is incorporated in a laser diode system for accelerating the turn-on operation of the laser diode independent of the control loop bandwidth of the laser diode system. The accelerator circuit provides a boost current to a compensation capacitor... | 05/12/2009 |
| 7529282 | Apparatus for driving light emitting element and system for driving light emitting element In case of driving each of light emitting parts of a surface emitting laser, each of light emitting parts is made to be in forward-bias state and switches appropriately change bias voltage, which is lower than laser oscillation threshold voltage, and drive voltages,... | 05/05/2009 |
| 7515620 | Method for optimizing laser diode operating current A method for optimizing a dc operating drive current of a laser diode is presented. Lasers of a particular type are characterized in terms of the dependency of certain parameters on temperature and of the minimum bias current required for adequate laser speed. The m... | 04/07/2009 |
| 7471709 | Apparatus and method of controlling emission of laser beam An apparatus and method of controlling emission of a laser beam in an image forming apparatus. The method includes generating a first reference voltage and a second reference voltage corresponding to a normal mode and a toner save mode, supplying one of the first re... | 12/30/2008 |
| 7443894 | System and method for laser temperature compensation A method for compensating for changes in output power or wavelength of an optical source with temperature. Many optical sources have power and/or wavelength variations with temperature which can be compensated by open- or closed-loop methods if a method of accuratel... | 10/28/2008 |
| 7443897 | Method for distinguish failure modes in an APC circuit and an optical transmitter using the same The present invention provides an optical transmitter that enables to distinguish failure modes of the auto-power control (APC) of the laser diode (LD). The transmitter provides the APC circuit comprised of the driver for supplying the driving current, the LD, the P... | 10/28/2008 |
| 7443896 | Optical midpoint power control and extinction ratio control of a semiconductor laser The present invention provides a method and apparatus, such as an integrated circuit, to control the optical midpoint power level and the extinction ratio of a semiconductor laser and maintain the optical midpoint power level and the extinction ratio substantially c... | 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 |
| 7436869 | Laser circuit substrate This invention makes it possible to meet a requirement of high-quality image printing and high-speed driving of a semiconductor laser driver in a laser beam printer or the like while suppressing radiant noise. A laser circuit substrate includes a first wiring patter... | 10/14/2008 |
| 7433377 | Laser drive method and apparatus A laser diode is employed to output light. A laser driver is employed to drive the laser diode. A laser driver control unit is employed to control the driving, such that carrier concentration of the laser is substantially forced to a desired concentration as photon ... | 10/07/2008 |
| 7426226 | Drive circuit and drive method for semiconductor light source A circuit for driving a semiconductor laser including a semiconductor integrated circuit, which controls the drive of the semiconductor laser, and is connected to one end of the semiconductor laser. Moreover, the driving circuit incorporates a first power source +Vc... | 09/16/2008 |
| 7423247 | Automatic control of laser diode current and optical power output An automatic power control system provides a control signal that regulates the output power of at least one laser diode. Coarse adjustment of the control signal is provided by a first means, preferably a digital variable resistor, while fine adjustment and compensat... | 09/09/2008 |
| 7420997 | Wavelength control in wavelength selective, phase, and gain regions of semiconductor lasers Particular embodiments of the present invention relate generally to semiconductor lasers and laser scanning systems and, more particularly, to schemes for controlling semiconductor lasers. According to one embodiment of the present invention, a laser is configured f... | 09/02/2008 |
| 7418018 | Driver circuit for semiconductor laser diode The present invention provides an LD driver able to stably control the output power and the extinction ratio of the optical signal without regarding the coupling mode, the AC mode or the DC mode, between the laser diode and the LD driver. The LD driver includes the ... | 08/26/2008 |
| 7415053 | Optical transmitter with a least pair of semiconductor laser diodes The present invention is to provide an optical transmitter with reduced power consumption. The optical transmitter includes two laser diodes connected in series to each other, one of which is connected in the anode thereof to the first driver, while the other of whi... | 08/19/2008 |
| 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 |
| 7411986 | Optical system laser driver with a built in output inductor for improved frequency response A laser driver comprises a PNP transistor current source, an inductor coupled to the PNP transistor current source, a switch coupled to the inductor, and a current sink coupled to the switch. The PNP transistor current source supplies a first current to a laser if t... | 08/12/2008 |
| 7406110 | Method and apparatus for controlling power of laser diodes A method and apparatus for controlling the power of laser diodes are provided. The apparatus includes an output voltage sensor, which senses output voltages of at least two laser diodes and outputs the output voltages to an optical power controller. The optical powe... | 07/29/2008 |
