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| Number | Title | Issue Date |
| 8184669 | System and method to regulate high current radiation sources Disclosed is a high current radiation system. The system includes a high current radiation source to generate radiation and an analog circuit to generate, based, at least in part, on an input signal representative of the present current level delivered to the high c... | 05/22/2012 |
| 7940821 | Temperature compensating method of laser power in optical disk storage apparatus A temperature compensating method of laser power in an optical disk storage apparatus is disclosed whereby temperature is compensated so that laser power outputted by a laser diode can be constantly outputted regardless of temperature changes. According to the prese... | 05/10/2011 |
| 7756171 | 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... | 07/13/2010 |
| 7724790 | 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. A method for driving semiconductor lasers by automatic current control or automatic power control with a constant current source involves the steps of... | 05/25/2010 |
| 7599412 | Method and electronic circuit for controlling of a supply voltage of a laser diode The invention relates to a method for initializing a control of a supply voltage of a light source, such as a laser diode, the light source being arranged in a first circuit configuration having an associated first reference voltage level or the light source being a... | 10/06/2009 |
| 7586961 | Laser systems A laser system 1 comprises six solid state diode laser modules 37.1 to 37.6 whose output beams are directly coupled into beam steering devices 38.1 to 38.6 and thereby routed to laser combining dichroic mirrors 39.1 to 39... | 09/08/2009 |
| 7505493 | Methods and systems for semiconductor diode junction protection Protection methods and protection systems for semiconductor devices with diode junctions. ... | 03/17/2009 |
| 7499478 | Laser driver, optical disk apparatus using the same, and laser control method An optical disk apparatus uses a laser driver which can measure the frequency of the high-frequency superimposed current of the semiconductor laser simply and accurately. The apparatus includes a semiconductor laser which emits a laser beam onto the optical disk, a ... | 03/03/2009 |
| 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 |
| 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 |
| 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 |
| 7400662 | Calibration of laser systems A method for determining a condition of the laser system includes determining a change in a laser current from an initial value. A method for measuring a laser current includes determining a difference between the values of a power supply current, which is the value... | 07/15/2008 |
| 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 |
| 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 |
| 7369585 | Semiconductor based broad area optical amplifier An optical amplifier including: a photonic gain clement; and, a transistor electromagnetically coupled to the gain element to inject current into the gain element responsively to the internal optical intensity of the gain element. The coupling of the transistor and ... | 05/06/2008 |
| 7369151 | Laser control circuit and image forming apparatus An image data processing section subjects input image data to image processing, and outputs first to fourth image data. First to fourth pulse width modulation circuits are PWM circuits in each of which a plurality of reference positions are set in one pixel, and out... | 05/06/2008 |
| 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 |
| 7369590 | Laser diode driving circuit A disclosed laser diode driving circuit causes a laser diode to emit light by varying a current value of a current source in accordance with a control signal input externally and supplying a current that is the same as or proportional to the current value to the las... | 05/06/2008 |
| 7369587 | Temperature control for coarse wavelength division multiplexing systems Optoelectronic devices and methods are used to maintain a CWDM transmitter operating within design parameters over an extended ambient temperature range. In order to avoid excessive wavelength drift with temperature shifts, lasers in the CWDM transmitters are heated... | 05/06/2008 |
| 7359414 | 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... | 04/15/2008 |
| 7359649 | Infrared transmitter circuit and electronic device An infrared transmitter circuit causes an output current to flow to a light emission diode via a current mirror circuit constituted of three transistors by using a current supplied from a power source circuit, so that the light emission diode emits light. When a vol... | 04/15/2008 |
| 7356058 | Adaptive laser diode driver and method An adaptive laser diode driver capable of driving various laser diode types as well different laser diodes from the same type, while ensuring optimal optical performance over the lifetime and temperature change of the diode. The driver adaptively changes the voltage... | 04/08/2008 |
| 7352784 | Laser burst boosting method and apparatus Methods and apparatus for managing thermal loads on a laser gain medium and for boosting the output power of a diode pumped laser are disclosed. The short-term average pumping power to the gain medium is increased, to provide a burst of pumping energy to the laser g... | 04/01/2008 |
| 7345513 | Driver circuit with automatic offset compensation of an amplifier and method for offset compensation of an amplifier of a driver circuit A driver circuit is provided, which includes a differential amplifier whose output signal controls the driving input signal, a reference signal generator that supplies a reference input of the differential amplifier, an external feedback that applies a signal, which... | 03/18/2008 |
| 7342949 | Laser scanning device A laser scanning device includes a semiconductor laser that emits a laser beam, a laser power detector that detects laser beam power of the semiconductor laser, a reference voltage generator that generates reference voltage for controlling the laser beam power of th... | 03/11/2008 |
| 7324569 | Method and system for spectral stitching of tunable semiconductor sources A multi semiconductor source tunable spectroscopy system has two or more semiconductor sources for generating tunable optical signals that are tunable over different spectral bands. The system enables the combination of these tunable signals to form an output signal... | 01/29/2008 |
| 7317743 | Temperature and jitter compensation controller circuit and method for fiber optics device Systems and methods are provided for configuring an optoelectronic device so as to control various operating conditions at various temperatures. The method includes operating the optoelectronic device at a first temperature, adjusting a first control parameter of th... | 01/08/2008 |
| 7298977 | Optical transmitter The present invention is intended to prevent a light-emitting diode from emitting light continuously in the case when the level at an input terminal is fixed high because of software or the like and to avoid various problems, such as battery exhaustion and breakdown... | 11/20/2007 |
| 7266136 | Temperature compensation for fiber optic transceivers using optimized convergence algorithms A temperature compensation system comprises a laser driver having a first potentiometer, the laser driver configured to provide a first signal to a laser based on a value of the first potentiometer and an optical communication analyzer configured to provide a second... | 09/04/2007 |
| 7260043 | Recording/reproducing apparatus, and method of detecting state thereof A data recording/reproducing apparatus wherein various data to be used for maintenance are measured, and parameters required for analysis of the maintenance data are prerecorded to realize prediction of the service life of a semiconductor laser and detection of occu... | 08/21/2007 |
| 7248611 | Frequency scanning pulsed laser having synchronously set subthreshold current The present invention provides methods and apparatus for flexible and reproducible control of quantum cascade laser frequency scans having short (nanosecond) pulse excitations. In accordance with a preferred embodiment of the invention, a method of digital frequency... | 07/24/2007 |
| 7242701 | Laser wavelength control arrangement and method Wavelength control and stabilization of a laser is achieved by a practical, inexpensive, and accurate technique adapted for most optical transmission system applications by a method involving a laser characterization phase and a laser wavelength control and stabiliz... | 07/10/2007 |
| 7230961 | Temperature and jitter compensation controller circuit and method for fiber optics device An exemplary optoelectronic transceiver 100 incorporating features of the present invention is shown in FIGS. 2 and 3. The transceiver 100 contains a receiver circuit, a transmitter circuit, a power supply voltage 19 and ground con... | 06/12/2007 |
| 7224709 | Electrical circuit for a directly modulated semiconductor radiation source The invention relates to an electrical circuit for a directly modulated semiconductor radiation source having a semiconductor radiation source, to which a modulated current is supplied in a manner dependent on a digital data signal, the falling signal edge of said c... | 05/29/2007 |
| 7215891 | Integrated driving, receiving, controlling, and monitoring for optical transceivers An optical transceiver includes a single integrated circuit chip to integrate the drive, receive, control, and monitoring functions of the optical transceiver. The single chip may further have an advance replacement algorithm and monitoring algorithm for the opto-el... | 05/08/2007 |
| 7206012 | Memory device on optical scanner and apparatus and method for storing characterizing information on the memory device An optical scanner is provided having a memory device thereon. The memory device may store operational characteristics of the optical scanner or data that characterizes laser beam scan path and/or laser power requirements by each laser of the optical scanner. The me... | 04/17/2007 |
| 7203213 | 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... | 04/10/2007 |
| 7203218 | Solid-state laser device A solid-state laser device, comprising two or more resonators for outputting laser beams on a same axis, a first light emitter and a second light emitter for entering excitation light to each of the resonators, a photodetector for monitoring which monitors the outpu... | 04/10/2007 |
