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7620283 |
Optical device using a hollow-core photonic bandgap fiber
An optical device includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber has a longitudinal axis and is twisted about the longitudinal...
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7619817 |
Polarization filter utilizing Brewster's angle
A polarization filter utilizing Brewster's angle. The polarization filter includes a stimulus receiving body having more than one facet. At least two of the more than one facet being arranged at...
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7613366 |
Polarization mode dispersion compensator and polarization mode dispersion compensating method
An amount of change of a control signal applied to a polarization controller in a polarization mode dispersion compensator is determined for each feedback loop by evaluating degree of polarization...
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7609915 |
Apparatus and method for a waveguide-based optical polarizer/isolator
The present invention provides an apparatus for a one-way waveguide and/or a circular polarizer that includes a waveguide having a height, a width, a length and a wave propagation direction. A...
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7603044 |
Polarization control for multichannel and polarization multiplexed optical transport networks
A system and method are provided for calibrating orthogonal polarity in a multichannel optical transport network (OTN) receiver. The method accepts a composite signal and separates the polarization...
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7583881 |
Optical element and display with transparent tensioned supporting films
An optical element comprises a stack of at least three juxtaposed films with at least one inner optical film and two outer transparent films exhibiting high dimensional stability, wherein a...
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7577325 |
Method of fabricating a polarization sorter
A method of fabricating a passive polarization sorter includes the steps of providing first and second waveguides. The first waveguide has an input and an output. The first waveguide supporting at...
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7577324 |
Methods to reduce polarization dependent loss in planar lightwave circuits
Polarization dependent loss may be reduced by providing at least one dummy waveguide or at least one dummy metal structure. Polarization dependent loss may also be reduced by imposing a mechanical...
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7574073 |
Optical devices with integral isolators
An isolator assembly, for use internally within a multi-port optical switch, and which operates on a preselected number of input port channels. The assembly incorporates a sequence of a...
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7565041 |
Symmetric optical circuit with integrated polarization rotator
The present invention is directed to an on-chip symmetric optical circuit having one or more integrally fabricated polarization rotators forming a monolithic, solid state polarization independent...
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7565040 |
Optical device using variable polarization element
An optical device using an electro-optical element is of great utility value to industry, owing to its fast responsiveness and the like. Prior art has problems such as high cost due to a large...
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7555220 |
Chromatic dispersion compensator (CDC) in a photonic integrated circuit (PIC) chip and method of operation
An optical equalizer/dispersion compensator (E/CDC) comprises an input/output for receiving a multiplexed channel signal comprising a plurality of channel signals of different wavelengths. An...
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7535639 |
Optical depolarizers and DGD generators based on optical delay
Techniques and devices for depolarizing light and producing a variable differential group delays in optical signals. In one implementation, an input optical beam is split into first and second...
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7526164 |
Reflective polarizers containing polymer fibers
A polarizer is formed with an arrangement of polymer fibers substantially parallel within a polymer matrix. The polymer fibers are formed of at least first and second polymer materials. At least...
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7522785 |
Measurements of polarization-dependent loss (PDL) and degree of polarization (DOP) using optical polarization controllers
Devices and techniques that use a polarization controller and a feedback control to the polarization controller to systematically control the polarization of light output from the polarization...
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7519247 |
Wavelength selective optical switch
A wavelength selective optical switch particularly usable as a programmable N×M optical switch in a multi-wavelength communication system. The switch uses a grating that separates multi-channel...
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7519240 |
Multi-section coupler to mitigate guide-guide asymmetry
A wavelength independent multi-section optical coupler having at least three optical couplers, and at least two differential phase cells. Each optical coupler has two waveguides forming a coupling...
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7515833 |
Optical double sideband modulation technique with increased spectral efficiency
An all optical network for optical signal traffic has at least a first ring with at least one transmitter and one receiver. The first ring includes a plurality of network nodes. At least a first...
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7515780 |
System and method for fabricating an optical isolator
There is provided a system and method for fabricating an optical isolator. More specifically, there is provided a fiber optical isolator comprising a first isolator stage comprising a Faraday...
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7512306 |
Polarization maintaining fiber pigtail assembly
The invention provides a fiber pigtail assembly wherein a polarization maintaining fiber is soldered directly to a mounting pad without a sleeve or a ferrule therebetween. A portion of the...
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7511773 |
Polarized light conversion apparatus
A polarized light conversion apparatus comprises a polarization device, a light source, a reflection device and a phase changing device. The polarization device includes a light-transmissible body...
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7505648 |
Device comprising a polarization-independent micro-resonator
Polarization-diverse optical devices and related methods are disclosed. In some embodiments, these devices and methods are realized by utilizing a four-port, wavelength-dependent optical coupler...
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7505640 |
Integrated optics polarization beam splitter using form birefringence
A method for separating the orthogonal polarization components of an incident optical signal into two spatially separated output ports is described. The method comprises a Mach-Zehnder...
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7499610 |
Method of using a polarization sorter
A method of using a passive polarization sorter comprising the step of deploying a first waveguide and a second waveguide forming an adiabatic region along a portion of their length. Then, an input...
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7499608 |
Apparatus and method for optical switching with liquid crystals and birefringent wedges
An optical switch includes an optical waveguide to route an input optical beam. At least one polarization switch receives the input optical beam from the optical waveguide. At least one...
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7496244 |
Method for generating a linear single polarization output beam
A method for generating a linear single-polarization output beam comprises providing an optically active linearly birefringent and linearly dichroic fiber for propagating light and having a single...
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7492977 |
All-fiber current sensor
Embodiments of the present invention provide a current sensing device. The current sensing device includes, inter alia, a three-by-three (3×3) optical coupler made of polarization-maintaining (PM)...
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7492518 |
Apparatus for transforming polarization and method thereof
An apparatus for transforming a polarization and a method thereof are provided. The apparatus includes a polarization rotator for rotating a polarization plane of an input optical signal by a...
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7489713 |
Tunable fiber laser light source
An optical fiber loop has a gain medium having a gain at an oscillation wavelength and optical circulators 13 and 14 . Collimate lenses 22 and 24 enlarge light bean taken from the optical...
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7486897 |
Polarization duobinary optical transmitter
A polarization duobinary optical transmitter is disclosed. The transmitter includes a precoder for coding an electric signal and a light source for generating continuous light. The transmitter also...
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7486895 |
Effective control algorithm for optical polarization mode dispersion compensators
The present invention includes apparatus and method of a variable step size dithering control algorithm for polarization mode dispersion controllers (PMDCs). The dithering step size of the PCs is...
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7486845 |
Waveguide polarization beam splitters and method of fabricating a waveguide wire-grid polarization beam splitter
A method in effectuating the redirection of light which is propagated within a waveguide, and which eliminates the necessity for a bending of the waveguide, or the drawbacks encountered in...
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7483642 |
Receiver for OTDM/PDM optical signals
A receiver for an OTDM/PDM pulse train ( 10 ) in which the pulses ( 12 ) have alternating polarizations (P 1, P 2 ) has a polarization insensitive optical switch ( 16; 161, 162, 163, 164 ) for...
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7477848 |
Optical receiving apparatus and method for controlling the optical receiving apparatus
An optical receiving apparatus sets, efficiently and optimally, a delay interferometer and a variable wavelength dispersion compensator in the apparatus. The apparatus has a variable dispersion...
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7474813 |
Connector mountable asymmetric free space optical isolators
A compact optical isolator includes a polarizer, a Faraday rotator, and an analyzer that are arranged in series. A magnet is also included to provide a magnetic field to the Faraday rotator. The...
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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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7463806 |
Methods of generating and transporting short wavelength radiation and apparati used therein
The present invention provides methods of generating short wavelength radiation, methods of transporting short wavelength radiation, and apparati used in these methods. One embodiment of the...
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7454093 |
Optical module and method of making the same and method of adjusting rotation angle of optical fiber
A polarization-maintaining optical fiber takes the attitude of the rotation angle position establishing the maximum extinction ratio in a condition where the polarization-maintaining optical fiber...
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7454092 |
Systems and methods for polarization mode dispersion mitigation
In one exemplary embodiment, a method comprises transmitting an optical signal via the optical line, measuring a relative change in spectral intensity of the optical signal near a clock frequency...
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7450788 |
Optical splitter/coupler and optical communication system
An optical splitter/coupler has: a multimode waveguide having an electrooptic effect, and propagating light in a multimode; one incident waveguide propagating light in a single mode, and inputting...
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7447386 |
Cascaded modulator system and method for QKD
A cascaded modulator system ( 20 ) and method for a QKD system ( 10 ) is disclosed. The modulator system includes to modulators (M 1 and M 2 ) optically coupled in series. A parallel shift...
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7444047 |
Multiplexing optical system
A multiplexing optical system includes collimator lenses, a first condensing lens, a second condensing lens and an optical fiber. The collimator lenses collimate divergent laser beams that have...
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7440660 |
Transducer for heat assisted magnetic recording
An apparatus includes a first waveguide configured to focus an electromagnetic wave to a focal region, and a second waveguide defining an opening having an end positioned adjacent to the focal...
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7433572 |
Optical bypass method and architecture
This invention pertains to optical fiber transmission networks, and is particularly relevant to transmission of high volume of data and voice traffic among different locations. In particular, 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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7433117 |
Polarization-diverse optical amplification
A polarization-diverse optical amplifier includes a polarization-sensitive optically active medium and a polarization splitter. The polarization splitter is configured to receive input light, to...
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7430351 |
Non-linear femtosecond pulse filter with high contrast
The invention relates to a non-linear optical filter capable of transmitting an electromagnetic pulse with a duration of less than about 1 picosecond, provided with means for generating an...
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7430345 |
Polarization controller using a hollow-core photonic-bandgap fiber
A polarization controller is provided. The polarization controller includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber has a...
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7430344 |
Acousto-optic device and fabrication method of acousto-optic device
An acousto-optic device is disclosed which can achieve both of suppression of secular change and prevention of device damage and can maintain a stabilized wavelength selection filtering operation....
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