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| Number | Title | Issue Date |
| 8175127 | System of method for dynamic range extension The present invention generally relates to the operation of optical network equipment such as optical amplifiers. In one aspect, a method of operating an optical amplifier is provided such that output of the optical amplifier avoids the effects of operating an optic... | 05/08/2012 |
| 8160114 | Single longitudinal mode laser diode A single-mode, etched facet distributed Bragg reflector laser includes an AlGaInAs/InP laser cavity, a front mirror stack with multiple Fabry-Perot elements, a rear DBR reflector, and a rear detector. The front mirror stack elements and the rear reflector elements i... | 04/17/2012 |
| 8155159 | Method and apparatus for calibrating burst mode laser transmitters A method is provided to calibrate a monitor photodiode that measures the optical output power generated by an optoelectronic transceiver module that includes a burst mode laser diode. The method includes disabling the power control loop that controls an average opti... | 04/10/2012 |
| 8085824 | Optimization of laser parameters to achieve desired performance One example disclosed herein relates to a method of at least partially optimizing one or more output performance parameters of a laser die. The method includes an act of identifying one or more output performance parameters to be at least partially optimized, an act... | 12/27/2011 |
| 7978740 | Ultralow noise mode-locked laser and RF sinewave source Systems, devices and methods of generating both a precision electrical timing signal as well as a precision optical timing signal. A novel, modified opto-electronic loop oscillator is used to drive a harmonic mode-locked laser. A novel opto-electronic loop has a lar... | 07/12/2011 |
| 7961766 | Method and system for controlling wavelengths of multi-path laser A method for controlling wavelengths of a multi-path laser is provided. The method includes: obtaining a difference between an actual output wavelength and a target output wavelength of each laser (S601); obtaining a corrected control amount of a temperature ... | 06/14/2011 |
| 7920611 | Laser apparatus, laser irradiation method, and manufacturing method of semiconductor device It is an object to provide a laser apparatus, a laser irradiating method and a manufacturing method of a semiconductor device that make laser energy more stable. To attain the object, a part of laser beam emitted from an oscillator is sampled to generate an electric... | 04/05/2011 |
| 7899097 | Synchronized delay-coupled laser system A synchronized delay-coupled laser system includes at least two lasers. Each laser includes a laser fiber with a coupling means for coupling to a laser pump. The lasers are coupled to each other by way of two optical fibers. Each laser also includes a self-feedback ... | 03/01/2011 |
| 7894495 | Power stabilized laser diode array A system for controlling optical-power stability of emitting laser diodes (204), the laser diodes exhibiting temperature changes at the laser diode junctions (312), the temperature changes are predicted according to the laser diodes duty cycle. The sys... | 02/22/2011 |
| 7856037 | System of method for dynamic range extension The present invention generally relates to the operation of optical network equipment such as optical amplifiers. In one aspect, a method of operating an optical amplifier is provided such that output of the optical amplifier avoids the effects of operating an optic... | 12/21/2010 |
| 7852887 | Laser A pulsed laser is disclosed comprising an active lasing medium (1), an output coupler (5) and a rear cavity mirror (6). The rear cavity mirror (6) is attached to a mount (21) via an intermediate attachment (15). Heating elem... | 12/14/2010 |
| 7835411 | Laser frequency stabilizing device, method and program A laser frequency stabilizing device comprises a laser light producer operative to produce and emit a laser light containing a first and a second longitudinal mode light having different wavelengths; a spectrometer operative to spectrally decompose the laser light i... | 11/16/2010 |
| 7830931 | Semiconductor laser excitation solid laser device and an image formation device having the same A semiconductor laser excitation solid laser control device 1A according to the present invention is a control device for stabilizing a light quantity of an output light LO of a semiconductor laser excitation solid laser 2. The control device 1A... | 11/09/2010 |
| 7787504 | Optical supply arrangement In an optical supply arrangement, a laser source (10) provides transmitted laser light down an optical supply line (12, 14). A first coupler (16), remote from the laser source (10) along the optical supply line (14), taps off a sma... | 08/31/2010 |
| 7733929 | Wavelength tunable optical transmitter and optical transceiver A wavelength tunable laser module for DWDM is used, in which a single electroabsorption modulator integrated laser is mounted and an oscillation wavelength is made tunable by temperature control. Driving conditions of a laser and a modulator are determined such that... | 06/08/2010 |
| 7697579 | Optical frequency self stabilization in a coupled optoelectronic oscillator Methods and devices for a coupled optoelectronic oscillator having optical frequency stabilization. The coupled optoelectronic oscillator includes a harmonically mode-locked laser cavity having a Mach-Zehnder modulator for mode-locking and an intracavity Fabry-Perot... | 04/13/2010 |
| 7684451 | Optical transmitter module for stabilizing optical output power and wavelength An optical transmitter module includes a semiconductor laser for outputting forward outgoing light and backward outgoing light, a temperature control device for controlling a temperature of the semiconductor laser, a beam splitter plate for receiving incidence of th... | 03/23/2010 |
| 7680159 | Temperature shift matching Laser light (λL) within a spectrum range is generated (51g) and filtered (29g). Thereby the spectral location of the filter characteristic (λF) is shifted in a controlled manner (60) to establish a d... | 03/16/2010 |
| 7643522 | Method and apparatus for gas discharge laser bandwidth and center wavelength control A gas discharge laser system bandwidth control mechanism and method of operation for controlling bandwidth in a laser output light pulse generated in the gas discharge laser system is disclosed which may comprise a bandwidth controller which may comprise an active b... | 01/05/2010 |
| 7564881 | Optical transmission module with digital adjustment and the adjusting method The invention discloses an optical transmission module with digital adjustment and method thereof. The module includes a laser (21), a laser driver (22), an automatic power adjustment circuit (23), an automatic temperature adjustment circuit ( | 07/21/2009 |
| 7496120 | Compact laser output monitoring using reflection and diffraction Compactness is preserved while enabling beam monitoring of optical properties of an output beam by employing a combination of reflection and diffraction. An input beam is reflected, divided using reflection/diffraction, and re-reflected. As a consequence, both a lig... | 02/24/2009 |
| 7496119 | External cavity laser with multiple stabilized modes A laser apparatus for providing a stabilized multi mode laser beam includes an external cavity for providing an optical path for generating a laser beam which is stimulated by a gain medium, where the external cavity has first spectral characteristics, and a mode-se... | 02/24/2009 |
| 7492796 | Method and apparatus for automatically controlling a power of a laser diode A method and apparatus to automatically control an output power of a laser diode, include generating an error voltage between an output voltage of the laser diode sampled during an automatic power control period and a reference voltage, and performing proportional-i... | 02/17/2009 |
| 7486708 | Method and system for stabilizing operation of laser sources A system for stabilizing an output optical power from a laser source against drifts induced by temperature and/or aging, said output optical power including a target optical-modulation amplitude around a target average value includes: ... | 02/03/2009 |
| 7483455 | Control method and control circuit for laser diode, and optical transmitter using the same A control method for a laser diode is conducted such that optical output and OMA (optical modulation amplitude) or extinction ratio of the laser diode are controlled while modulating the optical output of the laser diode by applying a bias current and a modulation c... | 01/27/2009 |
| 7466730 | Femtosecond laser device having output stabilizing mechanism A femtosecond laser with stabilized output, and a method for stabilizing the output of a femtosecond laser. The femtosecond laser comprises a regenerative amplifier, a photodetector, a control portion and a variable attenuator, wherein the variable attenuator is pro... | 12/16/2008 |
| 7460572 | Optical module and method for monitoring and controlling wavelengths The present invention provides wavelength monitoring and/or control enabling size reduction and low power operation without requiring a complicated optical system in its wavelength monitoring and controlling mechanism. The measurement portion (1) measu... | 12/02/2008 |
| 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 |
| 7428254 | Athermalisation of tuneable lasers This invention describes a technique and apparatus to use any tuneable laser to generate a specified output frequency without controlling its temperature. This technique only involves a thermal sensor and a controller a determine the current(s) of voltage(s) applied... | 09/23/2008 |
| 7426227 | Semiconductor laser device, optical disk apparatus and optical integrated unit A semiconductor laser device includes: a first cladding layer, which is made of a nitride semiconductor of a first conductivity type and is formed over a substrate; an active layer, which is made of another nitride semiconductor and is formed over the first cladding... | 09/16/2008 |
| 7418017 | Interferometer, in particular for determining and stabilizing the relative phase of short pulses A description is given of an optical structure (100), in particular for determining and stabilizing the relative phase of short pulses, which contains a broadening device (6) for broadening the frequency spectrum of pulses of electromagnetic radiation,... | 08/26/2008 |
| 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 |
| 7388891 | Wide bandwidth light source PROBLEM TO BE SOLVED: to realize a wide bandwidth light source capable of a stable operation providing a less spectrum variation. SOLUTION: Optical pulses 202 outputted by this optical pulse-generating device 201 are split by optical coupler ... | 06/17/2008 |
| 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 |
| 7372630 | Laser, irradiation apparatus, laser irradiation method, and method for manufacturing semiconductor device Providing a method and apparatus for efficiently irradiating a uniform laser light on an irradiation surface even when a laser light of high coherence or a large size substrate is used. The laser irradiation apparatus of the invention comprises a laser; means for di... | 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 |
| 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 |
| 7369586 | Laser module In a laser module comprising a hermetically sealed container having inside a semiconductor laser device whose emission wavelength is 350˜450 nm, generation of organic volatile gas is suppressed in the container and life of the module is prolonged. In a laser module... | 05/06/2008 |
| 7366422 | Dispersion compensating device and optical transmission system A dispersion compensating device having a VIPA plate which is an optical component, a lens, and a mirror includes high reflectivity side monitor means for monitoring the light that is input into the VIPA plate and emitted from the first reflecting surface. By this, ... | 04/29/2008 |
| 7366366 | FBG sensing system To provide a low-cost FBG sensing device having a high reliability, suitable for high-speed measurement such as vibration measurement, able to perform a remote measurement, and simple data processing, the FBG sensing device comprising one or more light sources each ... | 04/29/2008 |
