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| Number | Title | Issue Date |
| 8379681 | Laser diode driving device and image forming apparatus including the same A disclosed laser diode driving device drives laser diodes with driving currents obtained by adding switch currents to corresponding bias currents and includes a common switch current generating circuit configured to generate a common switch current according to an ... | 02/19/2013 |
| 8238394 | Low power consumption pump driving circuit The present patent application provides a low power consumption pump driving circuit including a laser cooling chip, a PMOS transistor, a NMOS transistor, a LC filter circuit, a laser, and a voltage sampling circuit. The pulse width modulating signal generated by th... | 08/07/2012 |
| 8238395 | Automatic power control (APC) loop for adjusting the bias current of a laser diode A automatic power control loop comprises a photo diode used for sensing a light intensity of a laser diode to generate a feedback current, a switch selector used for selecting one among a plurality of predetermined currents according to a control signal generated by... | 08/07/2012 |
| 8238393 | Multi-beam laser light-intensity control circuit and optical scanning apparatus including the same A multi-beam laser light-intensity control circuit includes laser diodes; a light-receiving element for receiving a laser beam emitted from each laser diode and outputting a current corresponding to the light intensity of the received laser beam; and an automatic po... | 08/07/2012 |
| 8228961 | Temperature feedback control for long-term carrier-envelope phase locking A feedback control module for stabilizing a carrier-envelope phase of an output of a laser oscillator system comprises a first photodetector, a second photodetector, a phase stabilizer, an optical modulator, and a thermal control element. The first photodetector may... | 07/24/2012 |
| 8170074 | Tracking injection seeding power based on back facet monitoring (BFM) of an injection seeded laser A method of estimating an injection power of seed light injected into an injection-seeded transmitter. A back face monitoring (BFM) response of the injection-seeded transmitter is determined, and data representative of the BFM response stored in a memory. During run... | 05/01/2012 |
| 8098698 | Active spectral control of DUV laser light source According to aspects of an embodiment of the disclosed subject matter, a line narrowed high average power high pulse repetition laser micro-photolithography light source bandwidth control method and apparatus are disclosed which may comprise a bandwidth metrology mo... | 01/17/2012 |
| 8073029 | Semiconductor optical device To provide a semiconductor optical device which can restrain laser characteristics from being deteriorated by excitation in a substrate mode and can reduce the number of manufacturing steps. A semiconductor optical device comprises a first DBR layer, provided on a s... | 12/06/2011 |
| 7970029 | Method and apparatus for driving semiconductor lasers, and method and apparatus for deriving drive current patterns for semiconductor lasers Semiconductor lasers are driven such that high output laser beams are stably obtained without a long start up time. The light outputs of a plurality of semiconductor lasers are detected by photodetectors. The semiconductor lasers are driven by automatic power contro... | 06/28/2011 |
| 7894497 | Driving circuit using probability density function The present invention provides a laser diode driving circuit that enables to precisely control the amplitude of the driving current with suppressing the overshoot and the undershoot appeared in the monitor signal of the optical output from the laser diode. The drivi... | 02/22/2011 |
| 7864826 | Optical transmitter applicable to burst signal and method for controlling the same An optical transmitter and a method to control the transmitter are disclosed, in which the optical output may be substantially maintained even in the inactive state of the input burst signal. The optical transmitter includes the APC feedback control and the detector... | 01/04/2011 |
| 7852889 | Active spectral control of DUV light source According to aspects of an embodiment of the disclosed subject matter, a line narrowed high average power high pulse repetition laser micro-photolithography light source bandwidth control method and apparatus are disclosed which may comprise a bandwidth metrology mo... | 12/14/2010 |
| 7809034 | Auto-power control circuit to maintain extinction ratio of optical output from laser diode The present invention provides an auto-power control (APC) circuit and a method to stabilize the extinction ratio of an optical output from a laser diode (LD) in an optical transmitter. The APC circuit according to the invention includes two feedback loops for the m... | 10/05/2010 |
| 7801192 | Monitoring method and VCSEL array with monitoring function VCSEL array with a structure in which vertical cavity surface emitting devices are arranged on a substrate. The VCSEL array includes first and second optical devices. The second optical device receives light that is directed parallel to the substrate and emitted fro... | 09/21/2010 |
| 7787507 | Method and apparatus for controlling laser modulation based on measurements of average laser output power Laser modulation is controlled by using a measurement of the average output power level of the laser to adjust the amplitude of the modulation current as necessary to prevent the laser from being over- or under-modulated and to adjust the amplitude of the bias curre... | 08/31/2010 |
| 7782915 | Optical transmitting module including laser diode mounted on driver circuit The present invention is to provide alight emitting module that improves the positional precision of a semiconductor laser diode. A light emitting module of the present invention is configured with a semiconductor laser diode having a facet which inputs, or outputs ... | 08/24/2010 |
| 7729399 | Semiconductor laser driving circuit less susceptible to noise interference A laser driving circuit configured to drive a semiconductor laser diode, which is less susceptible to noise interference and capable of achieving the control of laser light intensity with high accuracy. Respective circuit components in the laser driving circuit such... | 06/01/2010 |
| 7720118 | Laser unit having preparatory function for activating the unit and activation method for the unit A laser unit having a preparatory function for activating the unit and an activation method for the unit, capable of stabilizing the temperature of each component of the laser unit in the preparation stage when the laser unit is activated in a low-temperature or hig... | 05/18/2010 |
| 7693196 | Semiconductor laser driving unit and image forming apparatus having the same A semiconductor laser driving unit is disclosed that includes a first part generating a bias current; a second part generating a first current for causing the semiconductor laser to emit light, and outputting the first current to the semiconductor laser in accordanc... | 04/06/2010 |
| 7660336 | Method and device for determining an activation threshold A method is provided for determining a laser threshold of a laser diode, which is operated by a drive circuit as a function of a first signal in a first feedback and a second signal in a second feedback, the first feedback being supplied via an optical coupling of a... | 02/09/2010 |
| 7653101 | Excessive current input suppressing semiconductor laser light emitting circuit A semiconductor laser light emitting circuit includes a semiconductor laser diode emitting a laser light by modulating a current supplied thereto, a light intensity detection circuit that detects the laser light and generates a voltage, and a voltage-current convers... | 01/26/2010 |
| 7649921 | Laser module A laser module includes a semiconductor laser element and a feedback optical component forming an external cavity with the semiconductor laser element. Even if a ratio of a current threshold of the laser module changing according to a polarized state of returned lig... | 01/19/2010 |
| 7573922 | Semiconductor laser driving unit and image forming apparatus having the same A semiconductor laser driving unit is disclosed that includes a first part generating a bias current; a second part generating a first current for causing the semiconductor laser to emit light, and outputting the first current to the semiconductor laser in accordanc... | 08/11/2009 |
| 7515619 | Laser control circuit An apparatus and method to safely control the power output of a laser source. A power monitor is optically coupled to monitor a power output of laser source generating an optical signal. The power monitor is coupled to generate power feedback data indicative of the ... | 04/07/2009 |
| 7505496 | Systems and methods for real-time compensation for non-linearity in optical sources for analog signal transmission The present invention provides a compact analog directly modulated laser configuration that is suitable for use in the field that uses electrical feedback to compensate for non-linearity in real time, such that no matter how the LI curve changes, the electrical feed... | 03/17/2009 |
| 7502399 | Package for a laser diode component, laser diode component and method for producing laser diode component A package for a laser diode component is described. This comprises a carrier, which has on a front side a mounting region for a laser diode chip or laser diode bar, and at least one holding device, which is arranged on the carrier and has at least one aperture, in w... | 03/10/2009 |
| 7492798 | Modular transistor outline can with internal components In one example configuration, an optical package includes a substrate that supports a laser. The laser is configured for electrical communication with circuitry disposed on the substrate, and the laser is arranged to emit an optical signal along a first path. The op... | 02/17/2009 |
| 7492797 | Laser driver circuit A laser driver circuit driving a laser diode to generate an optical output corresponding to an input data, and controlling the optical output based on an output current from a photodiode that detects the optical output. The output current is converted into a voltage... | 02/17/2009 |
| 7480319 | Optical switches and logic and methods of implementation Optical switches and logic devices comprising microstructure-doped nanocavity lasers are described. These switches and logic devices have gain and thus can be cascaded and integrated in a network or system such as for example on a chip. Exemplary switching elements ... | 01/20/2009 |
| 7450619 | Laser driver loop control and method Various systems and methods are provided for biasing a laser. In one example, a feedback circuit establishes a bias current in a laser. A stabilizing capacitor is coupled to the feedback circuit, the stabilizing capacitor slowing the response of the feedback circuit... | 11/11/2008 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7403551 | Method and device for adjusting a laser The aim of the invention is to adjust the operating point of a laser that can be modulated by a data signal. The operating point of the laser is adjusted by regulating a direct current flowing through the laser; whereby said direct current correlates with the optica... | 07/22/2008 |
| 7400661 | Automatic setting of laser diode bias current Threshold current may be determined and one or more bias sources may be programmed in a laser drive circuit. For example, a laser diode emits light along first and second optical paths. A polarizer is positioned in the first optical path between the laser diode and ... | 07/15/2008 |
| 7397831 | Laser annealing apparatus and annealing method of semiconductor thin film using the same A laser beam temporally modulated in amplitude by a modulator and shaped into a long and narrow shape by a beam shaper is rotated around the optical axis of an image rotator inserted between the beam shaper and a substrate. Thus, the longitudinal direction of the la... | 07/08/2008 |
| 7386020 | Systems, devices and methods for temperature-based control of laser performance This disclosure concerns systems, methods and devices for temperature-based control of laser performance. One example of a method is performed in connection with a laser of an optoelectronic transceiver. In particular, the laser is operated over a range of temperatu... | 06/10/2008 |
| RE40343 | Control circuit with automatic DC offset An automatic gain control circuit in the feedback path for a laser wavelength control circuit is described herein. This gain control circuit automatically adjusts the amplification of the analog signals output from a photodetector array, where the array detects a fr... | 05/27/2008 |
| 7372881 | Semiconductor laser wavelength control device A semiconductor laser wavelength control device capable of controlling the optical wavelength constant even if the optical output intensity of the semiconductor laser varies and permitting a reduction in overall size is to be provided. It is provided with con... | 05/13/2008 |
