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7630651 |
Method and apparatus for controlling bias point of optical transmitter
An optical transmitter includes: a modulating unit that modulates an optical signal based on an electric signal; a first detecting unit that detects a first variation width of a maximum output of...
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7630417 |
Crystal whispering gallery mode optical resonators
Whispering-gallery-mode (WGM) optical resonators made of crystal materials to achieve high quality factors at or above 10 10 .
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7606501 |
System and method for generating optical return-to-zero signals with alternating bi-phase shift and frequency chirp
A system and method for generating an optical return-to-zero signal with frequency chirp. The system includes a bit separator configured to receive an electrical non-return-to-zero signal and...
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7580183 |
Light generator, optical amplifier, and optical communication system
In an optical amplifier according to the present invention, a change signal from a change signal source is fed into a light source or a drive circuit. The wavelength of light outputted from the...
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7561810 |
Optical communication apparatus
An optical communication apparatus for controlling the operating point of an optical modulation unit appropriately. An adding unit adds a bias voltage and a pilot signal. An optical modulation unit...
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7550810 |
MEMS device having a layer movable at asymmetric rates
A microelectromechanical (MEMS) device includes a substrate and a movable layer mechanically coupled to the substrate. The movable layer moves from a first position to a second position at a first...
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7539359 |
Systems and methods for chirp control of a dual arm Z-modulator to minimize dispersion effect of fiber plant
The present invention provides systems and methods for chirp control of a dual arm Z-modulator to minimize dispersion in the fiber plant. The chirp control is based upon a real-time control loop...
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7512237 |
Encryption for optical communications using dynamic subcarrier multiplexing
A multiplexing technique for optical communications used to create a pseudo-random communications signal in the optical domain such that only the sender and/or receiver can decode the signal. The...
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7511880 |
Semiconductor light source module
The present invention provides a semiconductor light source module including: a semiconductor light source for emitting a light flux with a predefined wavelength; a SHG element for converting an...
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7502154 |
Spatial light modulator alignment
A method and system for aligning a spatial light modulator with respect to an imaging device is disclosed. An image of the spatial light modulator can be formed upon the imaging device and a...
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7450288 |
Optical modulation device, optical transmitter, and optical transmission equipment
In the bias stabilization control using average optical power of signal light, there is a case where a control algorithm (maximum control or minimum control) changes depending on the amplitude of...
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7389045 |
Apparatus and method for monitoring and compensating an optical signal
Optical communication apparatuses and optical communication methods are provided. According to one aspect, an optical communication apparatus includes a communication path configured to communicate...
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7379223 |
Modulator control system
An optical communications system comprising: an optical input and an output, a source of input signals in an asymmetric format and having a duty cycle, a modulator for modulating the input signals,...
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7369290 |
Modulator bias control
Approaches to bias control are disclosed for an optical modulator that modulates an optical carrier with a data input signal. In one embodiment an electrical bias input signal provided to the...
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7366362 |
QPSK light modulator
The present invention provides a light transmitter with a stable IQ amplitude ratio relative to the characteristic change of a modulating system. The QPSK light modulator of the present invention...
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7345803 |
Optical modulator and optical modulating method
In an optical modulation device ( 10 ) having an electrical/optical interaction region ( 11 ), an electrical signal line ( 3 ) is connected to an electrical signal input terminal ( 2 a ), another...
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7324256 |
Photonic oscillator
A photonic oscillator includes an optical transceiver that serves the dual purpose of detecting a feedback RF lightwave signal carried on a laser beam and electrically filtering the RF lightwave...
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7245413 |
Light modulation apparatus and light modulator control method
A light modulation apparatus including a Mach-Zehnder type light modulator, a driver for modulator outputting a control signal according to an input electric signal, a light branching circuit...
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7206111 |
Sterically hindered PI-bridge nonlinear optical chromophores, processes including same, and devices therefrom
In various embodiments, chromophores are described that include novel electron acceptors, novel electron donors, and/or novel conjugated bridges that are useful in nonlinear optical applications....
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7200343 |
Drive control apparatus and drive control method for optical modulator
The present invention aims at providing a drive control apparatus and a drive control method with a simple configuration, which can also reliably compensate for operating point fluctuations of an...
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7173749 |
Opto-electronic feedback for stabilizing oscillators
This application describes use of an opto-electronic feedback in oscillators to suppress phase noise based on the high Q factor of the opto-electronic feedback.
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7165851 |
Optical frequency linear chirp variable unit
A linear opto-frequency chirp amount variable apparatus using a dielectric multilayer film mirror, which does not require the optical axis to be realigned each time the amount of a chirp is to be...
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7155071 |
Device for Mach-Zehnder modulator bias control for duobinary optical transmission and associated system and method
An electro-optical device includes an amplifier having an input receiving a data signal, a crossing adjustment input, and an output. The device includes a light source and a Mach-Zehnder modulator...
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7136211 |
Display device with non-linear ramp
In some embodiments, a drive circuit may be coupled to a spatial light modulator, wherein the drive circuit provides a non-linear analog ramp signal to the spatial light modulator. Other...
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7116460 |
Modulation control
A modulator arrangement for modulating an optical signal using a quadrature phase shift key for use in an optical wavelength division multiplex (WDM) optical communications system comprising a...
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7116459 |
Field diode detection of excess light conditions for spatial light modulator
An improved SLM that is capable of detecting when light incident on the SLM exceeds a predetermined threshold. A diode is fabricated around, or within the pixel array. Light incident on the array...
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7116458 |
Coherent generation, conversion, and modulation of electromagnetic radiation using shock waves or solitons propagating through polaritonic or excitonic materials
An optical modulator includes a crystal structure that exhibits polaritonic or excitonic behavior. A shock wave propagates through the crystal structure so as to optically modulate and manipulate a...
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7108402 |
Apparatus and methods relating to precision control of illumination exposure
Illumination exposure control systems comprising reflective pixelated spatial light modulators that reflect substantially all of the light impinging on them into at least two different light paths....
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7092643 |
Optical transmission apparatus and bias voltage control method for the optical modulator
The optical transmission apparatus has a Mach-Zehnder optical modulator, a light source for applying an optical signal of a continuous light to the optical modulator, a driving circuit for...
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7079780 |
Linearized optical link using a single Mach-Zehnder modulator and two optical carriers
An improved analog optical system which provides improved dynamic range as well as sensitivity relative to known analog optical systems. The analog optical system includes a Mach-Zehnder modulator...
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7075694 |
Apparatus and method for automatically correcting bias voltage for carrier suppressed pulse generating modulator
The present invention relates to an apparatus and method for automatically correcting a bias voltage for a carrier suppressed pulse generating modulator using the phase distribution of the output...
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7072092 |
Optical substrate with modulated structure
There is provided an optical substrate. The optical substrate includes at least one surface. The at least one surface includes at least one optical structure having a shape and dimensions, wherein...
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7072090 |
Addressing of an SLM
The present invention relates to a method to reduce charging effects affecting a degree of movement of at least one movable micro mirror in a spatial light modulator, said at least one movable...
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7064891 |
Optical wavelength converter with a semiconductor optical amplifier
An optical function device capable of controlling an optical signal with another optical signal, wherein a modulated input light I in of a wavelength λ 1 is coupled with a bias light I bias of...
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7050212 |
Active mode-locked lasers and other photonic devices using electro-optic whispering gallery mode resonators
Techniques and devices using whispering gallery mode (WGM) optical resonators, where the optical materials of the WGM resonators exhibit an electro-optical effect to perform optical modulation....
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7034977 |
Automatic DC bias control for the duobinary modulation format utilizing a low-pass electrical filter
A method and apparatus is provided for controlling the bias point of a Mach-Zehnder modulator. The method begins by applying a dither signal to a DC bias that is applied to a Mach-Zehnder...
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6972887 |
High energy arbitrary waveform source
A high-energy optical beam generator providing a desired output waveform. The generator includes a master oscillator, such as a mode-locked laser, to generate an input beam, a first dispersive...
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6963436 |
Method and device for waveform shaping of signal light
The method according to the present invention includes the steps of splitting an optical signal into first and second optical signals, increasing the pulse widths of the first optical signal to...
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6958841 |
Generation of digital patterns for spatial light modulation
Disclosed is a method for generating patterns to be used in a spatial light modulator having a plurality of pixels. The method includes generating an optical pattern to be placed upon the pixels of...
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6950217 |
Spatial light modulators having photo-detectors for use in display systems
A spatial light modulator having a photo-detector for use in digital display systems is provided. The spatial light modulator modulates a light beam having multiple light components of different...
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6950222 |
Apparatus and method for optical modulation
An optical modulator includes a phase modulator configured to drive light with an NRZI-coded drive signal for phase modulation and an intensity modulator to modulate the intensity of a...
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6947193 |
Optical phase modulator
To provide a phase modulator for introducing a topological phase, which is designed to produce any desired phase shift between zero and 360°, the phase modulator has means, at least one...
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6930814 |
Calibrating voltage controllable optical components in communication systems
A method of, and apparatus for, setting an operating (control) voltage of a voltage controllable optical component, such as a Mach-Zehnder optical modulator, having a periodic voltage/optical...
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6928091 |
Opto-electronic oscillator including a tunable electro-optic filter
An opto-electronic oscillator including a modulator for outputting modulated light and a tunable filter for receiving modulated light output from the modulator.
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6924916 |
Method and device for stabilizing operation point and optical output of external optical modulator
A method and device for stabilizing operation point and optical output of an external optical modulator. A low-frequency signal below a lower limit of signal frequency band of an input signal...
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6917455 |
Cascaded RZ and NRZ laser modulators having RZ/NRZ phase alignment bias control
An optical transmitter architecture has a return-to-zero (RZ) laser modulator coupled in cascade with a non-return-to-zero (NRZ) laser modulator. Modulator bias and electronic phase delay bias are...
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6882457 |
System and method for determining the modulation quality of an illumination modulator in an imaging system
A modulation quality detection system is disclosed for determining the modulation quality of an illumination modulator in an imaging system. The modulation quality detection system includes a...
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6882456 |
Laser pulse shaping device
A pulse shaping apparatus for shaping an input optical pulse into an output optical pulse having substantially constant optical power, includes a modulator that acts upon the input optical pulse in...
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6879422 |
Method of analog modulation and optical emitter using this method
Electro-optical modulator ( 100 ), comprising at least one electrical port ( 918, 919 ) and an input circuit ( 915, 916, 917 ) for the application of a modulating electrical signal to the said at...
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6873453 |
Laser refraction system
In one embodiment, a laser refraction system includes a refracting unit to refract light emitted from a laser. A refracting unit control procedure configures a charge on an OPC according to an...
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