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8179933 |
Systems and methods for visible light source evaluation
Particular embodiments of the present disclosure relate systems and methods for evaluating visible light sources. According to one embodiment, a method of evaluating a visible light source...
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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...
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8149886 |
Laser amplifier system and laser amplifier method
A laser amplification arrangement comprising a laser medium for producing an amplified laser emission as output signal from a useful signal to be amplified and a pump source has a switching...
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8121159 |
Temperature compensation method for laser power of an optical disk drive
A temperature compensation method for laser power in an optical disk drive is provided. A predetermined linear-fitting power curve and a temperature-changing slope curve are previously stored in...
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8098438 |
Power monitoring device for powerful fiber laser systems
A pig-tailed optical component used in a powerful fiber laser system is configured with a power monitor unit. The monitor unit has a plate-shaped beam splitter operative to reflect portions of at...
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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...
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8050302 |
Wavelength conversion laser light source, laser light source device and two-dimensional image display device adopting the same, and method of setting temperature of wavelength conversion element
A wavelength conversion laser light source includes: an element temperature switching section that switches a temperature of the wavelength conversion element according to a harmonic wave output...
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8031750 |
Light transmitter and automatic power control circuit thereof
A light transmitter and an auto-control circuit thereof are provided. The circuit includes a driving module and a feedback module. The driving module is coupled to the feedback module and a load....
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8009705 |
Fiber MOPA system without stimulated brillouin scattering
Methods and systems for increasing the threshold for stimulated Brillouin scattering are described. A seed source may generate one or more chirped seed pulses characterized by a pulse duration τ, ...
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7965746 |
Method for controlling power of an optical disk drive
A method for controlling laser power of an optical disk drive is provided. Firstly, a power-controlling curve of a first loop circuit is formed according to a real test. Next, two test points are...
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7957438 |
Method and device for monitoring light
A method for monitoring laser light launched into a core of a single mode fiber includes launching a portion of light directly into the cladding about the core. The cladding launched light is a...
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7940822 |
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...
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7907649 |
Bias signal generation for a laser transmitter in a passive optical network
The teachings presented herein disclose a method and apparatus for controlling the optical power of a laser in a passive optical network transmitter that outputs a modulated optical signal...
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7903704 |
Tunable quantum cascade lasers and photoacoustic detection of trace gases, TNT, TATP and precursors acetone and hydrogen peroxide
Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen...
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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...
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7889772 |
Laser oscillator apparatus and power supply apparatus therefor, and control method therefor
A laser output power command determination value from a controller (17) is input to an upper limit current determination unit (32), and an upper limit current value to be decided based on the laser...
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7876802 |
High gain tapered laser gain module
The present invention describes an optically end-pumped laser gain module, comprising a gain medium which is pumped by a light beam that has a larger size on the input face of the medium than on...
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7869476 |
Light source device, projector device, monitor device, and lighting device
The controller 170 controls the output power of the semiconductor laser device 100a depending on the temperature of the semiconductor laser device 100a acquired by the temperature sensor 130. The...
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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...
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7839906 |
Laser power control in an optical disc drive
Exemplary embodiments provide a method and system for controlling laser power in an optical disc drive. The exemplary embodiment of a control system includes at least one control component for...
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7835408 |
Optical transmission system
An optical transmission system includes a laser, a transmitter and a receiver. The laser is capable of operating on an inhomogeneously broadened optical transition of the active region of the...
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7835412 |
Laser control system, optical scanning device, and image forming apparatus
A control system for a laser source driven by a direct current drive voltage includes a system control board, a laser driver, and a power stabilizing circuit. The system control board is configured...
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7826502 |
Circuit and method for lessening noise in a laser system having a frequency converting element
A method and circuit is disclosed for a laser system wherein the power of the laser signal is kept at a constant near optimum value and a portion of an frequency doubled output signal is monitored...
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7822083 |
Laser light intensity control device, laser light intensity control method, and image forming apparatus
A disclosed laser light intensity control device includes a semiconductor laser configured to scan a photoconductor by emitting laser beams and form an electrostatic latent image, a temperature...
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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...
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7780360 |
Method and apparatus to generate and monitor optical signals and control power levels thereof in a planar lightwave circuit
Embodiments of an optical detection apparatus are disclosed which may include one or more of a waveguide, a trench formed in the waveguide, a reflective surface, and a photodetector. The waveguide...
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7778292 |
Laser processing apparatus, method for making settings for the laser processing apparatus, program for making settings for the laser processing apparatus, and computer-readable recording medium
It is an object to enable control according to an optimum temperature condition for a wavelength conversion device. There are provided a laser medium for creating fundamental-wave laser light with...
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7769063 |
Correction of power variations in laser sources
The present invention relates generally to semiconductor lasers and laser projection systems. According to one embodiment of the present invention, a method of correcting output power variations in...
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RE41457 |
Wavemeter for gas discharge laser
An optical configuration to illuminate an etalon in a laser wavemeter with a minimum level of light intensity. The system includes optical components to direct a portion of the laser output beam...
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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....
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7729397 |
Multi-variable control methods for optical packages
According to one embodiment of the present invention, an optical package comprises one or more semiconductor lasers coupled to a wavelength conversion device with adaptive optics. The optical...
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7729396 |
Laser diode device
A laser diode device capable of obtaining high light efficiency and improving output by using an AlGaInN compound semiconductor as a material is provided. The laser diode device includes...
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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...
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7697580 |
Monitoring of a laser source with front and rear output photodetectors to determine frontal laser power and power changes over laser lifetime
A power monitoring and correction to a desired power level of a laser or group of lasers utilizes two photodetectors which are employed to accurately determine the amount of output power from the...
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7680164 |
Configurable laser driver with common anode and common cathode outputs
Various laser drivers and methods are provided. In one embodiment, a laser driver is provided that comprises a laser driver circuit having a common anode portion and a common cathode portion. The...
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7672345 |
Semiconductor laser drive control apparatus
A drive signal for driving a semiconductor laser is generated on the basis of an image signal inputted in synchronism with a pixel clock. A bias signal to the semiconductor laser is generated at a...
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7646990 |
Circuit for detecting optical failures in a passive optical network
A circuit for detecting optical failures in a passive optical network (PON) wherein digital burst data transmitted by an optical transmitter is monitored by a photodiode, includes a power...
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7570680 |
Laser diode driver with multiple modulation current source
The present invention is to provide an LD-driver that enables to adjust the waveform of the driving current to the LD even the driver is constituted with a current controlled device such as bipolar...
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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),...
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7548570 |
Laser power control apparatus
In a laser power control apparatus for controlling a laser power of a combination drive, first laser light Lc applied onto a first optical disk and second laser light Ld applied onto a second...
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7535939 |
Optical power control apparatus, optical beam scanning apparatus, image forming apparatus, and optical power control method
An optical power control apparatus includes a changing unit which changes, a plurality of number of times, the value of a current flowing to an optical beam output apparatus, and an obtaining unit...
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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...
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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...
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7470886 |
Light receiving circuit, semiconductor laser device, and optical pickup device
There is provided a light receiving circuit capable of preventing an output variation of the light receiving circuit due to a change in ambient temperature with a simple configuration. The light...
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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...
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7457332 |
Laser power control unit and method for performing auto power control
A laser power control unit used for controlling the laser power of an optical pick-up unit (OPU) is provided. The laser power control unit includes: at least one analog-to-digital converter (ADC)...
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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...
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7439533 |
Optical module and optical communication device
An optical module includes a light emitting element, a connector part that supports one end of an optical fiber and optically couples the optical fiber to the light emitting element, and a...
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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...
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7401986 |
Method and apparatus to generate and monitor optical signals and control power levels thereof in a planar lightwave circuit
Embodiments of an optical detection apparatus are disclosed which may include one or more of a waveguide, a trench formed in the waveguide, a reflective surface, and a photodetector. The waveguide...
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