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6973268 |
Bi-directional optical transmission using dual channel bands
A bi-directional optical transmission system according to the present invention provides transport of x optical channels over n nodes. The system supports two-way transport of the x channels over a...
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6973236 |
Vertical taper waveguide
A tapered waveguide improves insertion loss occurring at the slab/waveguide interface of an optical array waveguide grating (AWG). The tapered waveguide has two segments. The first segment...
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6970621 |
Phase offset gratings
A grated waveguide is partitioned into two or more collateral gratings or sub-gratings, such as sidewall gratings, and the gratings are phase offset from each other to obtain a desired perturbation...
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6970276 |
Apparatus and method for quasi-phase-matched nonlinear frequency mixing between different transverse width modes
An apparatus and method for nonlinear frequency mixing of light waves relying on a nonlinear material having a nonlinear coefficient d and a waveguide fabricated in the nonlinear material. The...
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6968096 |
Diffraction device using photonic crystal
A diffraction device using a photonic crystal includes a diffraction grating, which has a period and periodically divides electromagnetic waves, and an input medium and an output medium, which...
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6965717 |
Optical device, polarization monitor and optical switch
The present invention has for its object to provide an optical device whose size is made small. In order to achieve this, according to the present invention there is provided an optical device in...
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6965708 |
Devices, systems, and methods for sensing moisture
Various exemplary embodiments, devices, systems, and methods for sensing moisture are disclosed, including at least one moisture sensor that comprises an optical fiber, a long period grating formed...
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6965716 |
Amplitude and phase control in distributed optical structures
A distributed optical structure comprises a set of diffractive elements. Individual diffractive element transfer functions collectively yield an overall transfer function between entrance and exit...
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6965483 |
Imaging system comprising a concave mirror
The invention concerns a system for achieving an optical image of an object ( 136 ), and/or for achieving optical collimation ( 137 ) of light from a light source ( 130 ), comprising a concave...
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6963684 |
Multi-band arrayed waveguide grating with improved insertion loss and wavelength accuracy
A planar lightwave circuit generalized for handling any given band of multiple bands of a wavelength range, including a first grating element handling a first group of bands; and a second grating...
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6963695 |
Optical communication system and method of assigning signal channels
The present invention relates to an optical communication system including a structure for suppressing deterioration of transmission characteristics of signals added at each of nodes arranged in an...
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6961501 |
Configurable photonic device
A photonic crystal, and a photonic device having such a photonic crystal, configured by changing its physical geometry in at least one region to alter light propagation and/or confinement. The...
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6961491 |
Optical structures distributed among multiple optical waveguides
An optical apparatus comprises an optical element having at least one set of diffractive elements and multiple channel optical waveguides. Diffractive elements of each set are distributed among...
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6959132 |
One-to-M wavelength routing element
Retroreflecting elements adapted for use in one-to-M wavelength routing elements are provided. Each retroreflecting element is configured to retroreflect an optical ray that is orthogonal to a...
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6959129 |
Bidirectional multiplexer and demultiplexer based on a single echelle waveguide grating
A bidirectional multiplexer and demultiplexer based on a single waveguide grating is presented. In one embodiment of the invention, the device contains a multi/demultiplexer having an echelle...
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6956984 |
Light driven, integrated optical device
A fully light-controllable integrated optical switch applicable in a slab geometry configuration includes a waveguide and an ad-medium in contact with the waveguide. The the ad-medium comprises a...
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6956993 |
Arrayed waveguide gratings with improved transmission efficiency
An arrayed waveguide grating (AWG) with improved transmission efficiency includes an input P×M star coupler, an output M×Q star coupler, and M waveguides of unequal length connecting the input...
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6956998 |
Compact optical delay lines
The present invention provides an optical delay, for example, an optical delay line, having at least first and second waveguides, each waveguide having a first end at a first side of the device and...
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6956994 |
Method for manufacturing a FBG having improved performances and an annealing-trimming apparatus for making the same
A method for manufacturing a FBG having improved performances and an annealing-trimming apparatus for making the same are provided. The trimming and the annealing steps are advantageously combined...
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6954567 |
Apodised complex filter
An optical filter composed of a concatenation of elementary filters consisting of chirped slanted Bragg gratings written on a continuous portion of an optical waveguide, characterized in that the...
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6954566 |
Apparatus for thermal compensation of an arrayed waveguide grating
An arrayed waveguide grating including a waveguide array extending between two free propagation regions is disclosed. One free propagation region is coupled to an input waveguide, and the other...
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6952512 |
Compensator for compensation of higher-order chromatic dispersion
A chromatic-dispersion compensator comprises a plurality of dispersive elements (Q in number. Q≧2) each exhibiting a dispersion characteristic D (λ) that varies substantially as a polynominal...
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6952510 |
Optically corrected intracavity fiber coupled multigain element laser
An optic device is placed in close proximity to multiple gain elements so as to selectively modify the divergence of the light from said multiple elements such that when the light is subsequently...
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6951715 |
Optical detection of label-free biomolecular interactions using microreplicated plastic sensor elements
Methods and compositions are provided for detecting biomolecular interactions. The use of labels is not required and the methods can be performed in a high-throughput manner. The invention also...
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6952509 |
Wavelength dispersion compensator and optical transmission line
In the WDM optical transmission, optical signals propagated through an optical transmission line are supplied to a circulator of a wavelength dispersion compensator. The optical signals supplied to...
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6952511 |
Gain equalizer and optical amplification apparatus
The present invention is directed to a gain equalizer having a preferable equalization characteristic and a structure that can be easily fabricated. The gain equalizer flattens a spectrum of light...
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6950578 |
Highly index-sensitive optical devices including long period fiber gratings
A long period fiber grating (LPG) device is formed to exhibit a “turn-around-point” (TAP) in a phase matching curve when the group velocities of two propagating modes are matched. When the...
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6950576 |
Mode coupling devices with complex spectral profile
A mode coupling device is provided for coupling co-propagating modes in an optical waveguide to provide a gain flattening filter for use with an optical amplifier such as an erbium-doped fiber...
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6950609 |
Tunable, multi-port optical add-drop multiplexer
A tunable (reconfigurable) OADM provides multiple drop ports and multiple add ports by which desired channels can be removed from, or added to, a composite optical signal. In one embodiment, a...
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6947640 |
Alignment and imaging system for writing Bragg gratings
A method is provided for precise and repeatable location of one or more Bragg gratings in a large diameter optical waveguide having a cross-section of at least about 0.3 millimeters, featuring the...
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6947638 |
Optical multiplexer/demultiplexer and manufacturing method thereof and optical multiplexing/demultiplexing module
At one side of a substrate, a vertical diffraction grating is formed integrated with the substrate, at the other side of the substrate, one pair or more of fibers are disposed through which either...
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6947630 |
Control method and control apparatus for variable wavelength optical filter
The present invention has an object to provide a control method and a control apparatus for a variable wavelength optical filter, which can reliably and stably control drive conditions of the...
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6947213 |
Diffractive optical element that polarizes light and an optical pickup using the same
A first diffractive optical element pattern with a pattern pitch that is no greater than a wavelength of incident light is formed on a first main surface of substrate such as a glass plate. Second...
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6947636 |
Optical module
An optical module comprises an optical fiber having a formed portion to form a fiber grating and a package to which the optical fiber is secured. The package comprises a single package member or at...
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6947641 |
Apparatus for filtering optical radiation at an operating wavelength
Apparatus for filtering optical radiation at an operating wavelength ( 19 ), which apparatus comprises a grating ( 1 ) written into a waveguide ( 2 ), and which grating ( 1 ) has a first end ( 3 ),...
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6947637 |
Measurement of fiber strain during processing
A method and system for determining strain impressed on an optical fiber at a possibly indeterminate temperature. The fiber ( 14 ) is formed with at least two sensors having different strain and...
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6947639 |
Integrated polarization coupler
A polarization coupler includes a stress-inducing feature disposed to generate a stress-field in a substrate. First and second waveguides each have a coupling portion that pass through the...
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6947613 |
Wavelength selective switch and equalizer
A device comprising a light modulator including a plurality of elements wherein each element is selectively operable such that the plurality of elements are dynamically configurable to combine...
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6944372 |
Tunable dispersion compensating bandwidth device for fiber optics system
A tunable dispersion compensating device for optical communications systems has a compliant support block having a longitudinal axis and a load-receiving surface oriented substantially parallel to...
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6944373 |
High index-step grating fabrication using a regrowth-over-dielectric process
An optical device ( 10 ) including a first semiconductor layer ( 12 ) on which is deposited a dielectric layer that is patterned and etched to form dielectric strips ( 14 ) as part of a diffraction...
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6944374 |
Optical fiber thermal compensation device
An optical filter having at least one optical fiber component and a thermal compensation device which includes a first, second and third member in which the thermal compensation device has a first...
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6941042 |
High-efficiency arrayed-waveguide grating router by wavefront formation
Interface loss, diffraction loss, and physical sizes of arrayed-waveguide (AWG) devices, such as AWG routers, are reduced via use of an array of asymmetric waveguide couplers that is inserted...
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6941044 |
Tunable optical structure for the compensation of chromatic dispersion in a light signal
A tunable optical structure and devices based thereon for the compensation of chromatic dispersion in a multi-channel light signal are provided. The optical structure includes a waveguide and a...
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6941043 |
Wavelength stabilization of an external cavity laser diode (ECLD)
An ECLD assembly includes a thermally stabilized substrate, a laser device fixedly mounted in relation to the substrate, and a waveguide with a grating region having a grating formed therein. The...
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6941055 |
Photonic crystal and optical waveguide elements
A photonic crystal having a structure of which the refractive index changes with a periodicity defined in a polar coordinate system is disclosed. And an optical waveguide element comprising said...
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6941039 |
Optical fiber gratings with azimuthal refractive index perturbation and devices for tuning, attenuating, switching, and modulating optical signals
The present invention relates to a type of optical fiber grating having an azimuthal refractive-index perturbation. The optical fiber includes a fiber grating that has a plurality of grating...
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6937794 |
Using a transversal Filter to compensate for dispersion
An arrayed waveguide grating may include a transversal filter to compensate for dispersion. The characteristics of each of the waveguides making up the waveguide region of the arrayed waveguide...
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6937638 |
Manufacturable sampled grating mirrors
The present invention relates to the tailoring the reflectivity spectrum of a SGDBR by applying digital sampling theory to choose the way each reflector is sampled. The resulting mirror covers a...
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6937792 |
Method and apparatus for wavelength switching of a laser source
A method and apparatus for wavelength switching a laser source. An external cavity ( 2 ) having a Bragg grating ( 5 ) is provided in an optical fiber ( 4 ). Space division switching is performed in...
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6937795 |
Combination wavelength multiplexer and wavelength stabilizer
In an optical device, each of a plurality of radiation sources generates a separate different wavelength output signal to a wavelength locking device wherein a grating device receives the separate...
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