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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...
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7970032 |
Method and device for reducing laser phase noise
The present invention relates to a method and device for reducing the phase noise of a laser signal from a laser source. This device comprises a first current generator for supplying a driving...
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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...
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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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7830933 |
Optical transmitter providing a plurality of transmitter units each having a thermo-electric cooler connected in series to each other
An optical transmitter with a plurality of transmitter units each providing a Peltier device is disclosed. The Peltier devices of the invention are connected in series with respect to the driver,...
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7809282 |
Dispersion compensating circuits for optical transmission system
Improved dispersion compensating circuits for optical transmission systems are disclosed. According to the improved method, there is provided a compensation circuit comprising a varactor diode...
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7792165 |
Dispersion compensating varactor circuit
Improved dispersion compensating circuits for optical transmission systems are disclosed. According to the improved method, there is provided a compensation circuit comprising a varactor diode...
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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...
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7738516 |
Method and apparatus for detecting and avoiding multiple-pulse states in ultra-short-pulse laser
In a detection method for undesired double- or multiple-pulse states in an ultra-short-pulse laser system operated in the soliton regime and intended for generating femtosecond or picosecond...
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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...
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7725043 |
System and method for reducing interferometric distortion and relative intensity noise in directly modulated fiber optic links
A laser transmitter with a feedback control loop for minimizing noise. The novel laser transmitter includes a laser, an external reflector adapted to form an extended cavity to the laser, and a...
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7656917 |
Circuit arrangement for generating light pulses
A circuit arrangement for generating light pulses includes an electro-optical converter; a switching element; and a charge store. The electro-optical converter is connected to the charge store via...
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7656914 |
Directly-modulated diode lasers with reduced overshoot
An optical signal is produced from a direct modulation resonant cavity device, such as directly-modulated diode laser having an electrode divided into multiple sections. Each section is driven with...
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7646794 |
Laser apparatus and manufacturing method of a battery
A laser apparatus is provided which is capable of achieving deep penetration into an aluminum-like metal material without causing welding defects such as spatters or cracks and performing...
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7590157 |
Laser noise elimination circuit and optical disc device
A laser noise elimination circuit raises the gain of a first TIA and at the same time reflected light from an optical disc of a laser beam is subjected to photoelectric conversion by means of a...
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7516897 |
Digital automatic power control loop for continuous and burst mode applications
An automatic power control circuit for a laser driver includes precharge circuitry to precharge inputs to a comparator receiving an indication of laser output power, for example from a monitor...
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7477850 |
Optical signal jitter reduction via electrical equalization in optical transmission systems
An optical transmission system comprises an electrical source and an electrical-to-optical converter. The electrical source is adapted to provide an electrical signal at an output thereof. The...
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7471710 |
Narrow linewidth semiconductor laser device
A narrow linewidth semiconductor laser device has a semiconductor laser and a low noise current source operatively connected to the laser with the current source being adapted to prevent...
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7471708 |
Gas discharge laser output light beam parameter control
A line narrowed gas discharge laser system and method of operation are disclosed which may comprise: an oscillator cavity; a laser chamber comprising a chamber housing containing a lasing medium...
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7470885 |
Photodetector-amplifier circuit and optical pickup device
The present invention provides a photodetector-amplifier circuit capable of eliminating an influence of noise due to stray light entering a non-selected photodetector to stably select and switch a...
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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...
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7386023 |
Systems and methods for reducing harmonics produced by oscillators
Systems and methods for reducing the harmonic content of an oscillator are provided. More specifically, waveforms with reduced harmonics are provided, as are waveform generators for producing such...
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7361936 |
Optical transmission and/or receiving device
An optical transmitting and/or receiving device has a semiconductor component with a first contact for connecting to a reference voltage and a second contact for obtaining or supplying a...
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7184452 |
Laser driver circuit for reducing electromagnetic interference
A laser driver circuit for reducing electromagnetic interference is disclosed. The laser driver circuit includes a first differential amplifier circuit, a second differential amplifier circuit and...
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7177331 |
Laser diode module with a built-in high-frequency modulation IC
A laser diode module with a built-in high-frequency modulation IC used to remove the reflected noise generated as the laser beam reads the signal to be played back and directly packaged within a...
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7167378 |
Circuit board transmitting high frequency signal
At least one of a feedback path and a feed path is divided into two paths, and the divided feedback path and the feed path for feeding a signal form a twisted pattern to suppress radiation noise of...
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7158552 |
Low relative intensity noise fiber grating type laser diode
The dependency of intensity noise is used to determine the wavelength difference between a laser diode gain peak and a reflection peak of a fiber grating in a fiber grating type laser diode....
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7149232 |
Laser noise cancel circuit and optical disk device
Disclosed herein is a laser noise cancel circuit for reducing laser noises in a reproduction system for an optical disk device including, a gain-variable amplifying noise cancel circuit for...
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7145929 |
Driver circuit and method for driving an electronic component
A driver circuit and a method drive an electronic component such as a laser diode with a variable electric current that is controlledly switched between at least two discrete current levels. The...
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7079558 |
Mode-locked laser method and apparatus
A method and apparatus for stabilizing the output of a mode-locked laser by monitoring the temporal behavior of the pulse train profile and controlling the laser cavity optical length and/or loss...
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7054344 |
Method and system for equalizing transmission line loss of a laser drive signal
A circuit for equalizing transmission line loss of a laser drive signal includes a laser driver, a laser diode, and a transmission line for connecting the laser driver to the laser diode. The laser...
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6947456 |
Open-loop laser driver having an integrated digital controller
A laser driver for generating drive waveforms that are suitable for driving a single VCSEL or an array of VCSELs. A digital controller is integrated into the laser driver and is utilized to...
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6907055 |
Method and circuit for measuring the optical modulation amplitude (OMA) in the operating region of a laser diode
A method and circuit for measuring the optical modulation amplitude in the operating region of a laser diode is described. The method utilises two measurements of OMA, each measurement being...
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6891868 |
Laser driver with noise reduction feedback for optical storage applications
In order to provide a low noise laser beam, a noise reducing feedback network is provided which creates a noise reducing signal and provides that signal to the laser itself. In order to produce the...
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6847665 |
Semiconductor laser device and method for producing the same
Not only a semiconductor laser element and a photodetector but also a capacitor connected to the photodetector is housed in a package to thereby reduce the distance from the capacitor to the...
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6829268 |
Synchronous servo control for a tunable laser
Tunable laser systems use servo control loops to control and monitor laser parameters such as channel, temperature, and power. The many control loops operate asynchronously, which means that noise...
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6771678 |
Laser system and method of operation having improved signal continuity and safety
An improved laser system and method of operation provides signal continuity and safety in the event of accidental interruption of the laser beam. At the transmitting end, a main laser generates a...
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6735229 |
Ultralow noise optical clock for high speed sampling applications
Methods and systems for using a laser type clock to produce a train of ultra-stable optical pulses. The methods and systems include generating an approximately 10 GHz ultralow noise pulse train...
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6661815 |
Servo technique for concurrent wavelength locking and stimulated brillouin scattering suppression
A servo technique for concurrently providing wavelength locking and stimulated Brillouin scattering (SBS) suppression in an external cavity laser. Respective wavelength locking and SBS suppression...
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6587490 |
Low-noise current source driver for laser diodes
A low-noise current source driver for a laser diode load is achieved by means of a current-regulated supply connected across the load, and a shunt regulator. The shunt regulator comprises a...
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6529536 |
Laser drive circuit and recording apparatus using the same
In a laser drive circuit for use in an optical disc recording and reproducing apparatus, a P-channel MOS transistor acting as a drive current source generates a drive current ILD depending on a...
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RE37524 |
Device for driving a semiconductor laser by a plurality of driving elements
A semiconductor laser apparatus comprises a semiconductor laser, a photodetector, first and second variable gain units, a controllable amplifying unit a driving unit, and a compensation unit. A...
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6188144 |
Power supply unit for pulsed laser using magnetic switch
A plurality of series circuits of saturable reactors and transferring capacitors are connected in parallel to a peaking capacitor, the plurality of saturable reactors are magnetically coupled, and...
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6181718 |
Electronically cooled semiconductor laser module with modified ground line inductance
The invention provides a semiconductor laser module with an electronic cooling device prevented from experiencing a lowering of the optical frequency response characteristic level in a band used...
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5923687 |
Bandwidth enhancement and broadband noise reduction in injection-locked semiconductor lasers
An injection-locked semiconductor laser process that improves the modulation bandwidth and reduces the broadband noise of an injection-locked semiconductor laser. Injection locking of a...
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5914974 |
Method and apparatus for eliminating reflected energy due to stage mismatch in nonlinear magnetic compression modules
A high voltage pulse power generating circuit capable of eliminating secondary pulses due to stage mismatch in the stages of its magnetic pulse compressor circuit is disclosed. The pulse generating...
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5524015 |
Optical noise reduction circuitry for laser systems
A servo controlled laser system is provided which provides a laser output beam having reduced optical noise. The laser system may be any type of laser system and preferably is an ion laser system....
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5471492 |
Broadband matching network
A broadband matching network closely matches the output impedance of a broadband amplifier to the input impedance of a laser over a broad frequency band to facilitate efficient transfer of power...
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5442648 |
Noise rejection circuitry and laser system using the same
A controller including a closed loop servo system for a laser, or other entity is capable of substantial reductions in predictable, periodic noise such as the line noise induced by the source of...
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5361161 |
Variable spectral width optical noise source
An optical noise source. An optical amplifier produces unpolarized optical noise by spontaneous emission. The optical noise is emitted from one side of the amplifier and filtered by a bandpass...
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