| Patent Number |
Title Of Patent |
Date Issued |
| 7268699 |
Highway-rail grade crossing hazard mitigation |
September 11, 2007 |
| A hazard mitigation system to detect an object in a highway-railway grade crossing. A structure is provided that includes a fixed foundation and a surface layer that is cushionably placed above the foundation, such that the structure is located between tracks at the crossing. At least on |
| 7245217 |
Hazard mitigation for railway track intrusions at train station platforms |
July 17, 2007 |
| A hazard mitigation system to detect intrusion by an object into a track zone at a train station platform. A structure is provided that includes a fixed foundation and a surface layer that is cushionably placed above the foundation, such that the structure is located in the track zone. A |
| 7139295 |
Tunable wavelength locker, tunable wavelength spectrum monitor, and relative wavelength measurem |
November 21, 2006 |
| A system for tuning the wavelength of a beam from a tunable laser. A tunable etalon assembly includes a Fabry-Perot etalon with paired reflectors to filter the laser beam. The tunable etalon also includes a thermal unit to thermally adjust the separation of the paired responsive to a |
| 7116846 |
Athermal fiber Bragg grating |
October 3, 2006 |
| An a thermal fiber Bragg grating assembly. A platform provides two attachment locations and has a first coefficient of thermal expansion. A stick provides two ends and has a second coefficient of thermal expansion. A fiber Bragg grating provides two ends and has effective third coeff |
| 7027136 |
Structure analysis and defect detection system |
April 11, 2006 |
| A structure analysis and defect detection system in which a laser light source provides light via optical fiber to fiber Bragg gratings that change resonant frequency as stresses change in the structure. Light at the resonant frequencies of the fiber Bragg gratings is reflected and l |
| 7004038 |
Fiber optic flow meter |
February 28, 2006 |
| A metering module, or a system employing such, for monitoring fluid flow with a laser light source, a light detector and a processor, wherein the fluid may be a gas or liquid. A valve section and a grating section including a fiber Bragg grating (FBG) are provided. The valve section |
| 6904200 |
Multidimensional optical gratings |
June 7, 2005 |
| Multi-dimensional optical gratings (600, 700) of a background material (602, 702, 802) having a first refractive index and cells (604, 704, 804) of at least one different refractive index. The cells (604, 704, 804) may occupy two-dimensional or three-dimensional grids, defining the optic |
| 6858834 |
Light wavelength meter |
February 22, 2005 |
| A light wavelength meter (10) able to accept light into a light diverter (16) and impart to it a transverse displacement characteristic which can be detected in a light detection unit (20) connected to a processor (22). Optionally, a light diverger (18) may be provided to enhance angular |
| 6812452 |
Apparatus and method for measuring the wavelength of light present in a light beam |
November 2, 2004 |
| A light wavelength meter (10) able to accept light into a light diverter (16) and impart to it a transverse displacement characteristic which can be detected in a light detection unit (20) connected to a processor (22). Optionally, a light diverger (18) may be provided to enhance angular |
| 6809865 |
ITU frequency/wavelength reference |
October 26, 2004 |
| A wavelength reference (10) including at least one gas-tunable etalons (12). Each etalon (12) has first and second reflective surfaces (20,22), making a reflecting surface pair (23). Each reflecting surface pair (23) surrounds a cavity (16) which is filled with a gas-tunable medium (19) |
| 6807339 |
Wavelength division multiplexing and de-multiplexing system |
October 19, 2004 |
| A multiplexing and de-multiplexing system that may both use the same wavelength division multiplexing (WDM) device. For multiplexing, light sources provide a plurality of light beams having different wavelengths and the WDM forms a single light beam. For de-multiplexing, a light source |
| 6804060 |
Interference filter fabrication |
October 12, 2004 |
| An interference filter (10) and a process (100) by which it may be fabricated. A substrate (12, 52, 82) is provided and a working region (56, 84) is defined therein or thereupon. Relative to the horizontal substrate (12, 52, 82), a plurality of vertical layers having differing refractive |
| 6795459 |
Light frequency locker |
September 21, 2004 |
| A light frequency locker (10) able to accept a light beam (14) generated by a controllable light source (12) into a light diverter (16) and impart to it a transverse displacement characteristic which can be detected in a light detection unit (20) connected to a processor (22). The proces |
| 6748138 |
Optical grating fabrication |
June 8, 2004 |
| A process (400) to construct single- and multi-dimensional optical gratings (100, 800) of interlayers (110, 230, 310 808) of differing refractive index, either in or atop a non-fiber substrate material (104, 202, 302). The optical gratings (100, 800) may particularly be Bragg type gratin |
| 6731659 |
Frequency locker |
May 4, 2004 |
| A frequency locker (100) for working with external light sources or frequency locked light sources (200, 300, 400) having integrated laser light sources (214, 414). The locker (100) provides multi-channel frequency tuning and stabilization with common components, particularly includi |
| 6718092 |
Frequency detection, tuning and stabilization system |
April 6, 2004 |
| A frequency processing system for detecting, tuning, or stabilizing light frequency or wavelength in a light beam produced by a light source. A grating block receives the light beam and may produce diffracted beams and a passed beam. The diffracted beams are received by respective detect |
| 6552856 |
Multi-channel wavelength locker using gas tuning |
April 22, 2003 |
| A method and system for providing wavelength-locked multi-channel signals with respect to a wavelength reference. Wavelengths of a plurality of radiation sources are introduced to at least one etalon having a gas medium. The etalon produces a plurality of equally spaced spectral lines |
