Matches 101 - 150 out of 269 < 1 2 3 4 5 6 >
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6791739 Electro-optic despeckling modulator and method of use  
A method of reducing the appearance of speckle resulting from a coherent light beam, includes the steps of: providing an electro-optic device having, an electro-optic substrate, an electrode array...
6791734 Method and apparatus for information modulation for impulse radios  
A method and apparatus for information modulation for impulse radios are presented in both single-tone and pulse stream configurations. The modulation techniques include combinations of amplitude...
6788832 Optical modulator and optical signal and electric wave signal converter using same  
An optical modulation apparatus includes an optical signal input section, an optical signal propagation path, an optical modulator that modulates the phase of optical signals in at least two of a...
6781741 Mach-Zehnder optical modulator  
A Mach-Zehnder optical modulator that can attain a higher transmission speed than the driver signal speed but also attains, by setting multi-value amplitudes, an information transmission volume...
6781740 Achromatic phase shift device and interferometer using achromatic phase shift device  
The present invention relates to an achromatic phase shift device ( 1 ) for introducing a wavelength independent optical phase shift in a first optical beam ( 40 ) during operation, comprising at...
6778313 Optical phase modulator and optical equalizer using the same  
In an optical phase modulator, a substrate has electro-optical effect. An optical waveguide is formed in a surface portion of the substrate. A phase modulation section is provided on an input side...
6778314 Phase modulator and phase modulating method  
In case of the high-speed operation, it is difficult to ignore the time required for the voltage to rise to the level of voltage to be applied and the time to fall to 0V when the voltage is applied...
6760142 Delay interferometer optical pulse generator  
In accordance with the invention, a train of RZ or CSRZ pulses is produced by passing phase modulated laser light through a delay interferometer. The parameters of the phase modulation and the...
6753992 Method for suppressing distortion in mach-zehnder optical modulators with a chirped or variable operating wavelength  
A method for suppressing distortion in a multi-wavelengths system which uses a Mach Zehnder optical modulator includes adjusting an internal path length mismatch of the modulator and changing an...
6750999 Reconfigurable quasi-optical unit cells  
A quasi-optical system is provided. More specifically, a quasi-optical system is provided comprising various embodiments of quasi-optical grids (such as arrays or layers and the like) with...
6747781 Method, apparatus, and diffuser for reducing laser speckle  
A method of reducing speckle includes dividing a laser illuminated area into phase cells, subdividing the phase cells into cell partitions, and applying a temporal phase variation to the cell...
6744048 Lens system for phase plate for transmission electron microscope and transmission electron microscope  
A lens system for use with a phase plate in a transmission electron microscope comprises a phase plate placed after the back-focal plane of the objective lens in an imaging system mounted...
6741379 Optical module having element for optical phase shift using electro-optic effect  
The optical module has an element mounted thereupon for shifting an optical phase by the electro-optic effect, and includes an element for shifting an optical phase by an electro-optic effect...
6741763 Optical data transmission apparatus and method  
In a system for transmitting intensity modulated light waves ( 20 ) over an optical fiber ( 18 ), an optical data transmission apparatus ( 10 ) includes a cw laser ( 12 ) conformed to emit light at...
6738174 Dual-electrode traveling wave optical modulators and methods  
The invention discloses phase-shifters, modulators, and method that produces a smaller π by means of a field excitation using multiple electrodes. A negative signal is introduced that travels with...
6735012 System for phase modulating an incoming optical wavefront  
An active optical system and method for phase-shifting desired portions of an incoming optical wavefront. A control optics assembly receives an incoming optical wavefront and adjusts that incoming...
6728436 Optical signal modulation method and optical signal transmission system for high speed transmission system  
The invention relates to an optical signal transmission system with phase modulation and the implementation method. The system adds a phase modulator in the optical signal-emitting module. The...
6721081 Variable duty cycle optical pulses  
A device ( 16 ) in a system ( 10 ) modulates an optical signal ( 13 ) and tunes the duty cycle of the optical signal ( 13 ) for optimizing system performance as a response of the duty cycle. The...
6711309 Noise suppression in lightwave communication systems  
An optical communications system comprises, among other things, a laser source; an optical waveguide interconnected to the laser source to carry an optical signal from the source to an optical...
6683721 Low dispersion interleaver  
The present invention relates to an interferometer useful in the interleaving and de-interleaving of optical wavelength channels. Typically the invention comprises a beamsplitter and two...
6658213 Modulation controlling circuit  
The invention relates to a modulation controlling circuit for supplying a modulating signal to an external modulator that outputs a modulated optical signal, while setting a proper operating point...
6657769 Low voltage, optical phase modulator  
A low voltage optical phase modulator includes a splitter having an input, a first output, and a second output. The input receives an optical signal and is split between the first and second...
6643051 Method and system for generating return-to-zero signals  
For the purpose of optical transmission, narrow pulses are generated with the aid of at least two modulators (M 1 , M 2 ), in which use is made of drive signals (TS 1 , TS 2 ) of the same frequency...
6628450 Method and apparatus for phase-shifting an optical beam in a semiconductor substrate  
A semiconductor-based gain optical phase-shifting device, method and apparatus. In one aspect of the present invention, an apparatus according to an embodiment of the present invention includes a...
6621617 Displaced-bias interferometer-detection (DB/ID) modulation  
A Mach-Zehnder interferometer is employed to implement phase modulation of an optical signal. The interferometer is biased at its maximum extinction point. The modulated optical signal may have a...
6606182 Tuning and temperature compensation of the air-gap etalon for dense wavelength-division multiplexing application  
An etalon includes a tuning plate in the air-gap between the etalon mirrors. The method of tuning includes selecting a tuning plate that makes the optical length of the etalon slightly less than...
6594061 Acceleration-insensitive opto-electronic oscillators  
Techniques for reducing frequency shifts in an oscillating frequency of an opto-electronic oscillator by having at least two separate optical delay elements in an optical portion of an...
6587256 RF combiner based on cascaded optical phase modulation  
An RF combiner ( 10 ) that combines a plurality of RF signals ( 12 ) in the optical domain. The combiner ( 10 ) includes a single optical source ( 14 ) that generates an optical beam ( 16 ). The...
6577429 Laser projection display system  
A display apparatus includes a laser light source for emitting a light beam having a coherence length; a beam expander for expanding the light beam; a spatial light modulator; beam shaping optics...
6574031 Method for balancing detector output to a desired level of balance at a frequency  
A multi-gas sensor is provided which modulates a polarized light beam over a broadband of wavelengths between two alternating orthogonal polarization components. The two orthogonal polarization...
6552838 LiNbO3 Mach-Zehnder modulator with low drive voltage requirement and adjustable chirp  
An electro-optic modulator and associated method are provided. The electro-optic modulator includes an optical waveguide comprised of two pairs of coplanar modulation strips, the strips being...
6549323 Active optical system for phase-shifting desired portions of an incoming optical wavefront  
A first control optics assembly receives an incoming optical wavefront and adjusts that incoming optical wavefront. A second control optics assembly receives a driver optical wavefront and adjusts...
6549322 Method and apparatus for enhancing image contrast using intensity filtration  
An intensity filter for deep UV lithography enhances contrast and also therefore increases the resolution of patterned images by passing only intensities that fall within a specific minimum...
6545805 Polarization-dependent retroreflection mirror device  
Conventional retroreflection mirrors in the form of right angle prisms are quite sensitive to beam position and beam angle errors. Manufacturing and assembly tolerances are also a cause of concern...
6538793 Electronically tunable and modulatable quasi-optic grid oscillator  
The present invention discloses an electronically frequency tunable and phase modulatable quasi-optic grid oscillator. The oscillator includes a reference signal input port whereby a small external...
6538794 Efficient non-linear phase shifting using a photonic band gap structure  
A device is provided for generating a photonic signal having a phase different from an input photonic signal that is incident on the device. The input photonic signal has an signal frequency,...
6496297 Device and method for modulating an optical signal  
An optical device for modulating optical signals in a wavelength division multiplexed communication system. The device includes a plurality of phase modulators. Each of the phase modulators is...
6490076 Optical phased array for depolarized optical beam control  
A optical phased array device for optical beams with general polarization. A reflective embodiment of the inventive optical phased array interposes a quarter-wave plate between a linearly polarized...
6469822 Optical phased array device and the method therefor  
An optical irregular phased-array is disclosed. The effective positions of the phase-controlled elements in the phased-array form an irregular array, such that the size of each phase-controlled...
6456419 Frequency modulated liquid crystal beamsteering device  
An electrical exciting circuit produces a plurality of oscillating electrical excitations, each at an independently controllable frequency. A set of drive electrodes are distributed in an array,...
6452714 Enhanced feed forward optical frequency/phase demodulator  
A demodulation system used in connection with an analog optical link. An optical carrier signal modulated with an RF signal is split into two portions. One carrier signal portion is applied to a...
6433911 Frustrated total internal reflection-based micro-opto-electro-mechanical modulator/demodulator  
A micro-opto-electro-mechanical systems (MOEMS) modulator based on the phenomenon of frustrated total internal reflection (FTIR). The modulator effects amplitude and phase modulation at the...
6429959 Low-loss electrode structures for optical modulation applications  
An optical device includes a grounded base and an optical modulator chip having a top surface, a back surface and side surfaces. The optical modulator chip is positioned on the grounded base with...
6426828 Doppler phase shifting using dual, switched phase shifting devices  
A system of inducing a phase shift using moving reflector elements. The moving reflectors can be moving mirrors or an acousto-optical filter. The moving reflectors oscillate i.e. the move first in...
6421163 Two dimensional transform generator  
A system that optically performs complex transforms, such as Fourier transforms. The system includes a pixel addressable spatial modulator that, in parallel, adjusts the phase of the light of each...
6411420 Electro-optical element, and method of driving and method of manufacturing the same  
Polarization inversion domains 2 are irregularly formed in a ferroelectric substrate 3 constituting an electro-optical element 1 at least in the propagation direction of a light beam A. An...
6407848 Servo-stabilized-phase, differential coherence detector  
Multi-domain, phase-compensated, differential-coherence detection of photonic signals for interferometric processes and devices may be manufactured holographically and developed in situ or with an...
6396617 Photonic band gap device and method using a periodicity defect region doped with a gain medium to increase photonic signal delay  
A photonic band gap structure device and method for delaying photonic signals of a predetermined frequency and a predetermined bandwidth by a predetermined delay is provided. A Fabry-Perot delay...
6384954 Optical modulator  
An optical device is disclosed for the external modulation of the output 4 of an optical radiation source. The device includes a first optical modulator 2 driven by an NRZ coded electrical data...
6385354 Electrostrictive fiber modulators  
An apparatus modulates the phase of an optical signal. The apparatus includes an optical medium for propagating the optical signal. At least one electrode is positioned in proximity with the...
Matches 101 - 150 out of 269 < 1 2 3 4 5 6 >