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8160406 |
Acoustic sensor with at least one photonic crystal slab
An acoustic sensor includes at least one structure including at least one photonic crystal slab and an optical fiber optically coupled to the at least one photonic crystal slab, and having at least...
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8059923 |
Systems and methods for minimally-invasive optical-acoustic imaging
An imaging guidewire can include one or more optical fibers communicating light along the guidewire. At or near its distal end, one or more blazed or other fiber Bragg gratings (FBGs) directs light...
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8036499 |
Acousto-optic filter
Optical waveguides are provided on a substrate, a thin film whose refractive index is optically less than the refractive indices of the optical waveguides is provided on the surface of the...
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7962044 |
Temperature stabilizing packaging for optoelectronic components in a transmitter module
An optical transmitter is disclosed having a temperature stabilization system for an optical filter for maintaining constant the frequency response of the filter. The filter is mounted within a...
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7873081 |
Compact and high performance wavelength tunable laser
A tunable laser cavity utilizes a dispersion compensated acousto-optic tunable filter. The wavelength accuracy and stability is achieved by a wavelength locker utilizing two separate intracavity...
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7826688 |
Enhancing the sensitivity of resonant optical modulating and switching devices
Embodiments of the inventions described herein comprise a device and method for manipulating an optical beam. The method comprises propagating an optical beam through a waveguide in proximity to a...
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7809219 |
High-sensitivity fiber-compatible optical acoustic sensor
An acoustic sensor includes at least one photonic crystal structure having at least one optical resonance with a resonance frequency and a resonance lineshape. The acoustic sensor further includes...
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7755073 |
Acousto-optic filter and optical CDMA system using the same
Provided are an acousto-optic filter and an optical code division multiple access (CDMA) system using the acousto-optic filter. The acousto-optic filer includes: an acousto-optic mode converter...
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7724420 |
Frequency modulation structure and method utilizing frozen shockwave
A system and method for modulating the frequency of electromagnetic radiation utilizes a frozen shockwave in a photonic band gap structure. The structure provides a discontinuity in lattice...
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7720331 |
Methods and apparatus for use with optical fibres
An apparatus for performing mode scrambling in a multimode optical fibre 1 comprises an electromechanical transducer 3 and a signal generator 9. A portion of the fibre 1, which is in the form of a...
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7697795 |
Acoustic modulation
The present invention relates to the modulation of light traveling along a waveguide, in particular to the acoustic modulation of the light. There is provide a modulator arrangement for...
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7697794 |
Micropulse lidar transmitter based on a low-SBS erbium-doped silica fiber
A narrow-linewidth micropulse LIDAR transmitter based on a low-SBS single clad, small-mode-area optical fiber. High narrow-linewidth peak powers are achieved through the use of an erbium doped...
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7660492 |
Systems and methods for minimally-invasive optical-acoustic imaging
An imaging guidewire can include one or more optical fibers communicating light along the guidewire. At or near its distal end, one or more blazed or other fiber Bragg gratings (FBGs) directs light...
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7580184 |
Gires-Tournois etalons and dispersion compensators
A Gires-Tournois etalon (GTE) (10) comprising an optical fiber (12) in which a primary chirped fiber Bragg grating (FBG) (16) is provided, an RF signal generator (20), a piezoelectric transducer...
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7526148 |
High-sensitivity fiber-compatible optical acoustic sensor
An acoustic sensor includes at least one photonic crystal structure having at least one optical resonance with a resonance frequency and a resonance lineshape. The acoustic sensor further includes...
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7507891 |
Fiber Bragg grating tuner
The present invention relates an instrument tuner possessing a fiber optic with a prewritten fiber Bragg grating. The tuner is suitable for providing more accurate instrument tuning, capable of not...
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7505643 |
Apparatus and method for identification of optical cable
In order to identify an optical cable for optical communication from a remote place, a Sagnac interferometer including two strands of an optical fiber is formed in the optical cable, and a worker...
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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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7405859 |
Method and apparatus for selecting wavelength
A wavelength selecting apparatus includes a wavelength selecting filter and that a monitoring filter are similar acousto-optic tunable filters; a light source that outputs light having a specific...
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7400829 |
Transmission apparatus and path selection method of a transmission apparatus
A transmission apparatus that receives an optical signal by selecting any one of a plurality of provided optical signal transmission paths through protection control is configured to include a...
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7349632 |
Method of wavelength selection control and wavelength variable filter device
A method of wavelength selection control is disclosed. The method includes detecting reference RF frequencies by varying the frequency of a RF signal supplied to a reference acousto-optic tunable...
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7343056 |
Acoustooptic filter
An acoustooptic filter 1 having an optical waveguide 3 disposed on an upper surface 2a of an acoustooptic substrate 2, an interdigital electrode 4 which excites a surface wave disposed on the...
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7340115 |
Optical wavelength tunable filter
In an optical wavelength tunable filter (AOTF) using an acousto-optic effect of the present invention, there is provided a single SAW waveguide which propagates a surface acoustic wave generated by...
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7302121 |
Optical device and drive voltage supply device
The present invention is directed toward an optical device and a drive voltage supply device, which prevent occurrence of a DC drift and enable stable selection of light of desired wavelength...
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7302128 |
Fiber optic switch
A fiber optic switch uses induced periodic variations in a multi-mode optic fiber, to control power loss in the switch and power output.
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7292740 |
Apparatus and method for controlling transmission through a photonic band gap crystal
An apparatus (10) and method for dynamic frequency control of a photonic band gap crystal includes an acoustic band gap crystal (12) having a defect site (14), a photonic band gap crystal (20) in...
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7269306 |
Actuator arrangement for excitation of flexural waves on an optical fiber
A system for exciting flexural waves on an optical fiber (102) is provided. The system includes a substrate (114, 118), an actuator (106), and a mechanical optical fiber coupling (104). The...
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7215837 |
Optical waveguide display systems and methods
Optical waveguide systems and methods are described. In one aspect, a display system includes a planar acoustic cavity having a fundamental resonant acoustic mode. The acoustic cavity includes an...
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7209603 |
Acousto-optical device based on phonon-induced polaritonic band gaps
The device comprises an optical waveguide and an acoustic wave generating device. The waveguide has an optical band gap and a sharp electronic transition (e.g. an excitonic transition) in the band...
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7209607 |
Optical space-switching matrix
Optical switch matrix having at least an input matrix port defining at least a row of the matrix, a plurality of output matrix ports defining columns of the matrix, a plurality of switching...
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7187814 |
Optical add/drop device
A drop-type AOTF is used as a configuration for removing from a through signal an optical signal having the same wavelength as that of an optical signal to be added. To the drop-type AOTF, RF...
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7181094 |
Apparatus for controlling acousto-optic tunable filter and method of selecting wavelength
A radio-frequency-signal generator generates an RF signal. An optical monitor monitors a first intensity of a reference signal and a second intensity of a drop signal. A reference-frequency...
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7142735 |
Acousto-optic tunable filter controller
AOTF controller that monitors output power of a plurality of wavelengths of an AOTF and scans the frequency of corresponding RF input signals to an AOTF acoustic transducer and searches for the RF...
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7120321 |
Control method and device for optical filter
The present invention relates to a control method and device for an optical filter, and a primary object of the present invention is to achieve accurate tracking control of the optical filter....
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7068867 |
Ultrasonic position indicator
A system for monitoring a position of an instrument in a subject includes a light transmission medium configured to transmit light pulses to a desired region to produce an acoustic signal, at least...
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7062109 |
Acousto-optic device
The present invention relates to an acousto-optic device capable of improving the interaction efficiency for suppressing the driving power needed for SAW generation. The acousto-optic device...
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6984819 |
Optical converting type ultrasonic receiving apparatus
An ultrasonic receiving apparatus is equipped with such a condition capable of obtaining superior sensitivities. This ultrasonic receiving apparatus includes: an ultrasonic detecting element for...
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6950566 |
Method and apparatus for an acousto-optic filter that generates a helical wave and method for manufacturing same
A method to reduce optical intensity modulation is described that involves generating a spiraling wave onto an acoustic-optic interaction portion of an optical fiber within an acousto-optic filter...
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6947220 |
Devices for information processing in optical communications
Devices and methods for information processing in optical communications are provided. In its simplest embodiments, collimated light (1) passes through a non-grating diffractive structure (2) and a...
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6925229 |
Wavelength controllable optical device and light control method
A first optical waveguide for guiding light is formed on a substrate. A surface acoustic wave transducer for generating a surface acoustic wave which propagates along a direction in which the first...
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6925214 |
Connecting method of optical function devices, and optical apparatus
The present invention aims at providing a connecting method capable of suppressing an influence of stray light for a plurality of optical function devices formed on the same substrate, and an...
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6922498 |
Fiber-optic matrix switch using phased array acousto-optic device
A high-speed high-isolation fiber-optic matrix switch using only one acousto-optic device with phased array transducers is disclosed. Previously disclosed fiber-optic switches either required...
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6909823 |
Acousto-optic tunable apparatus having a fiber bragg grating and an offset core
A method and apparatus that microbend a fiber Bragg grating with a transverse acoustic wave. The fiber Bragg grating reflects one or more Nth order sidebands of reflection wavelengths an optical...
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6904188 |
Acousto-optic tunable filter having improved wave-damping capability
This invention relates to an acousto-optical tunable filter generally of the kind described in U.S. Pat. No. 6,266,462. More specifically, the invention relates to a filter and its construction,...
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6891982 |
Optical modulation device having excellent electric characteristics by effectively restricting heat drift
An optical waveguide for guided an incident light is formed on a substrate having an electro-optic effect. A first buffer layer is formed to cover an upper surface of the substrate. A conductive...
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6885807 |
High speed fiber-optic attenuation modules
Unique multi-diffraction structures using electronically controlled Bragg diffraction devices such as acousto-optic (AO) devices to accomplish optical beam attenuation control functions. These...
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6865335 |
Optical microphone for communication and other devices
A lightwaveguide panel to be used with a a mobile telephone (MT) or personal digital assistant (PDA), the pannel comprises a first portion for lighting an LCD and/or a keyboard, and a second...
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6847742 |
Tunable dynamic gain flattening filter using polarization delays
A dynamic gain flattening filter includes a first filter stage. The first filter stage has a first tunable coupling member and a first differential delay with first and second tunable delay paths....
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6839473 |
Optical fiber cladding with low polarization dependence and an acousto-optic tunable filter with low polarization dependent loss achieved through thermal annealing
This invention relates to a method of making optical fiber having low polarization dependence and an acousto-optical filter with low PDL. A section of the fiber is heated and then allowed to cool....
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6826327 |
Tunable narrow band optical filter
A method, an apparatus and a system are described for receiving an optical signal in an optical filter and routing the optical signal through the optical filter multiple times.
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