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7505192 |
Optical apparatus having a compound tri-state non-reciprocal rotator
An optical apparatus and methods for operating on a polarization state of a light beam using a compound tri-state non-reciprocal rotator having two Faraday rotators. A first Faraday rotator rotates...
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7466923 |
Polarization mode dispersion compensation
Methods and systems for PMD compensation in an optical communication system are implemented by transmitting multiple optical signals through a common optical conduit to an optical compensator that...
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7466878 |
Integrated polarization controllers with nano-electromechanical dielectric pertubation
A polarization controller includes a phase retarder having a rotation about an {1,0,0} axis that receives an optical signal from a waveguide structure. At least one nanoelectromechanical dielectric...
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7444040 |
Magneto-optical component
The invention relates to a magneto-optical component, such as a variable light attenuator, light modulator or optical switch, having small size, low power consumption and high speed. The...
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7433558 |
Methods for optical isolation in high power fiber-optic systems
Methods for optical isolation in high peak power fiber-optic systems prevent damage to a facet within a fiber-optic isolator caused by back-reflected light from, for example, an optical amplifier....
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7365533 |
Magneto-optic remote sensor for angular rotation, linear displacements, and evaluation of surface deformations
A system and method to detect angular rotation, linear displacement and/or surface deformations is presented. The method is based on the ability of a linear polarized light to interact with...
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7308171 |
Method and apparatus for optical isolation in high power fiber-optic systems
Methods and apparatus for optical isolation in high peak power fiber-optic systems prevent damage to a facet within a fiber-optic isolator caused by back-reflected light from, for example, an...
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7280264 |
Magneto-optical device
It is possible to reduce the size of a magneto-optical device, increase the speed of optical control, simplify power supply structure and its control, and maintain a Faraday rotation angle in an...
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7233672 |
Constant modulation for enhancing QKD security
A method of improving the security of a QKD system is disclosed. The QKD system exchanges qubits between QKD stations, wherein the brief period of time surrounding the expected arrival time of a...
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7224506 |
Single side band modulation device
A single side band modulation device includes a first Mach Zehnder interferometer and a second Mach Zehnder interferometer. The first Mach Zehnder interferometer includes at least two output arms,...
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7173762 |
Optical isolator with reduced insertion loss and minimized polarization mode dispersion
An isolator is disclosed that features a single birefringent correction element. The correction element is configured to eliminate differential group delay and walk-off simultaneously.
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7170921 |
Magneto-optic variable optical attenuator
A magneto-optic variable optical attenuator is provided that is used to control the intensity of a light signal. The optical attenuator includes at least one polarizing element having an optical...
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7158301 |
Method and device for modifying the polarization state of light
A magnetic, single-axis crystal is used to modify the polarization state of light, whereby light passes through pre-determined areas of the crystal. To change the polarization state of the light, a...
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7057792 |
Optical sensor unit for measuring current and voltage of high frequency
An optical sensor unit, free from electrical noise, includes a sensor case which has both lateral sides having high frequency connectors mounted thereon, and a metallic plate mounted inside the...
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7057791 |
Compact multipass optical isolator
An optical isolator is disclosed for transmitting light in a first direction and blocking light in a second direction along an optical pathway. The optical isolator includes an input polarizer...
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7046416 |
Polarization scrambler and a method for polarization scrambling
A polarization scrambler and associated method for polarization scrambling are provided, wherein light is passed through a retarder whose eigen modes and delay vary with time and which is driven...
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7006273 |
Faraday rotation device and optical device using same
Optical devices including a Faraday rotation devices improved in wavelength and temperature characteristics and an optical attenuator reduced in wavelength dependence and temperature-dependent...
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7002732 |
Magneto-optical devices
The invention provides small-sized, power-saving and easily-producible magneto-optical devices. The magneto-optical device comprises a Faraday rotator having nearly parallel surfaces and a...
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6958845 |
Optical control element
An optical control modulator comprises an input to receive light from a light source; a polarization divider to divide the light into two orthogonal plane-polarized light components; a Faraday...
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6947194 |
Method for compensating polarization mode dispersion, polarization mode dispersion compensator and optical fiber communication system
An optical signal is introduced into a polarization rotator to control the optical signal so that the output of the optical signal is maximized through the rotation of a plane of polarization of...
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6944363 |
Miniature magneto-optic fiber optical switch
An optical switch uses a walk-off crystal together with a Wollaston prism, a Faraday rotator, and a halfwave plate pair and a single collimating lens of one multiple-fiber pigtail for both input...
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6934068 |
Magnetic field and electrical current visualization system
Magnetic field and/or electrical current imaging systems utilizing magneto-optical indicator films (MOIF) based on magneto-optical material with in-plane single easy axis type of magnetic...
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6914707 |
Polarization scrambler, and a method for polarization scrambling
A polarization scrambler, and associated method for polarization scrambling, is provided wherein light is passed through a time-variant retarder. At least after upstream connection or downstream...
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6912080 |
Magneto-optic modulator and optical communication system using the same
The magneto-optic modulator rotates a polarization of a light incident to a magneto-optic device which causes Faraday effect under such a magnetic field arrangement that the RF magnetic field has a...
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6895688 |
Liquid crystal polarization rotator and method of using same
A liquid crystal polarization rotator device is able to rotate polarization fast enough to compensate polarization mode dispersion. The amount or degree of rotation is rapidly reconfigurable. The...
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6876481 |
Spatial light modulator
A spatial light modulator includes: a magnetic layer that is made of a magneto-optic material and includes a plurality of pixels in each of which a magnetization direction is independently set and...
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6876480 |
Farady rotation device and optical device comprising it
Optical devices including a Faraday rotation devices improved in wavelength and temperature characteristics and an optical attenuator reduced in wavelength dependence and temperature-dependent...
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6871023 |
Spread polarization transmitter and associated system and method of operation
A spread polarization transmitter for transmitting at least one light signal comprises a spread-spectrum communication apparatus and a polarization modulator. The spread-spectrum communication...
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6859298 |
Optical module of optical isolator structure
Disclosed is an optical module of an isolator structure including a semiconductor laser, a polarizer, and a Faraday rotator. The laser outputs a first linearly-polarized beam of a predetermined...
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6836353 |
Redundant switch fabric methods and system for switching of telecommunication signals
An optical switching system and method. The method includes tapping a first portion of an incoming data beam from an incoming source; and transferring the incoming data beam from the incoming...
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6829396 |
Wavelength characteristic control device, gain equalizer, and light amplifier
A wavelength characteristic control device capable of variably controlling a wavelength characteristic in a satisfactory manner. A polarized light wavelength characteristic changing element has a...
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6816300 |
Optical apparatus
An optical device includes a Faraday rotator made of a bismuth substituted rare earth iron garnet single crystal (BIG) having a Faraday rotation of 45 degrees, and permanent magnets arranged beside...
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6813056 |
High amplitude fast optical modulator
A short intense pulse of radiation is generated by shining radiation through a magneto-optical material and providing multiple stimulations to the material. The material is excited multiple times...
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6806990 |
Optical device and method for producing optical device
There is provided A method for producing an optical device by bonding optical elements each other without using adhesive wherein the optical elements are bonded each other by using optical elements...
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6795245 |
Polarization independent magnetooptic switches
This invention provides polarization independent magnetooptic switches. Input optical signals are switched to different output ports via polarization manipulation utilizing magnetically switchable...
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6792192 |
Optical variable attenuator
An optical variable attenuator is provided including polarizers for extracting a predetermined polarized wave component from an input optical signal, an array of Faraday rotators formed of a...
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6791740 |
Electro-optical device, method of driving electro-optical device, and electronic apparatus
The invention provides an electro-optical device, a method of driving the electro-optical device, and an electronic apparatus, capable of maintaining much higher display quality. In the device,...
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6785037 |
Faraday rotator
A Faraday rotator of multilayer film type is provided in which satisfactory optical characteristics are obtained with a small number of layers. In the Faraday rotator, a first periodic dielectric...
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6760145 |
Actuator for dual-axis rotation micromirror
An array of movable MEMS mirror devices is provided being electromagnetically actuated in one axis and using an additional set of coils, or a single coil, positioned off of the main axis of...
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6757101 |
None-mechanical dual stage optical switches
The present invention provides improved optical switches in which no mechanical movement is required to direct optical pathways between plural fiber ports. Advantageously, the inventive switches...
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6753997 |
Magnetic field generator for optical devices utilizing magneto-optical effect
A small-sized magnetic field generator which is suitable for mass production and provides better output stability. A plurality of coils are formed on a non-magnetic insulating material by...
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6717713 |
Variable optical attenuator which applies a magnetic field to a faraday element to rotate the polarization of a light signal
An apparatus which attenuates a light signal polarized in a first direction. The apparatus includes a polarization rotation unit and an output unit. The polarization rotation unit rotates the...
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6717706 |
State of polarization detector
State of polarization detectors and polarization control systems are disclosed. For example, the invention features an integrated optical assembly including: (i) a series of polarization-sensitive...
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6700694 |
Ferro-electric azimuth rotator
An electrically controllable azimuth optical rotator ( 10 ) includes a first quarterwave plate ( 16 ) for receiving a first beam of electromagnetic energy ( 22 ) having a first arbitrary...
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6673146 |
Method of manufacturing a magnet-free faraday rotator
A method of manufacturing is used to manufacture a magnet-free Faraday rotator having a square hysteresis loop, the Faraday rotator being formed of a bismuth-substituted rare earth iron garnet...
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6667827 |
Beam shutter
A beam shutter is provided which comprises a plane-parallel birefringent element for separation arranged to separate input light beams having orthogonal polarization directions on the same optical...
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6646777 |
Optical isolator with improved mounting characteristics
An optical isolator includes a first magnetic polar source having a first magnet axis, a second magnetic polar source having a second magnet axis parallel to the first magnet axis, and an optical...
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6618183 |
Method and apparatus for modulating unpolarized light
The method and apparatus for amplitude modulation of unpolarized light by at least one Bragg modulator on the basis of domain-invertible material, the unpolarized light is modulated by a first...
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6600601 |
Polarization-independent optical isolator and production method thereof
A polarization-independent optical isolator includes a first birefringent wedge plate having an inclined plane directed to a light incoming side; a second birefringent wedge plate having an...
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6594068 |
High switching speed digital faraday rotator device and optical switches containing the same
In all-optical networks, high speed optical switching and routing becomes one of the most important issues for interconnecting the transport network layers. This invention describes novel...
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