Mihailov
Innokenty Y. Mihailov, Kiev UA
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20130267285 | SYSTEM AND METHOD FOR ON-LINE ACADEMIC COMPETITION - A web application facilitates live on-line academic competition between teams and individuals based on multiple choice or fill-in-the-blank questions and fosters academic competition between students and schools. Using the software application, a team's Coach may enter his/her team in a league of regular competition, schedule a single competition with another team, or organize a competition between the team's members by dividing the team into multiple teams. The test environment provides the experience of competing over test questions, including a scoreboard that keeps track of progress with respect to the test time and the opponent. Students of comparable abilities on competing teams are matched using a matching algorithm that matches the students based on past test performance and the like. | 10-10-2013 |
Stephen Mihailov, Kanata CA
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20090060417 | Optical Fiber Fundamental Mode Field Expander - A device for providing an expanded mode field from a single mode optical waveguide is formed by fusing a length of single mode optical fiber with a length of fiber rod absent a cladding and adiabatically tapering the fused region. The length of single mode fiber has a core having a refractive index n | 03-05-2009 |
Stephen J. Mihailov, Ottawa CA
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20100230621 | PHOTONIC FILTERING OF ELECTRICAL SIGNALS - A filter and a method of filtering a high frequency electrical signal using photonic components is disclosed. The filter has a serially fiber-coupled laser source, a modulator, a filter, and a photodetector. The electrical signal is applied to the modulator. The modulated light propagates through the filter which is constructed to pass not only a modulated sideband, but also at least a fraction of light at the carrier frequency of the laser. The photodetector detects a signal at the beat frequency between the carrier and sideband signals, after both signals have propagated through the filter. As a result, a separate optical branch for light at the carrier frequency is not required, which considerably simplifies the filter construction and makes it more stable and reliable. | 09-16-2010 |
20110292965 | METHOD AND SYSTEM FOR MEASURING A PARAMETER IN A HIGH TEMPERATURE ENVIRONMENT USING AN OPTICAL SENSOR - A dual parameter sensor for sensing temperature and mechanical or chemical or related information is disclosed. The sensor is formed of an optical waveguide suitable for use in-situ in a high temperature environment having a Bragg grating written into a core region thereof with short-pulsed electromagnetic radiation. By noting the thermal Black Body radiation level above 650° C., wavelength shifts due to temperature can be decoupled from wavelength shifts due to the other parameter being sensed. Advantageously the thermal radiation can be used as an optical source to probe the Bragg grating, considerably simplifying the interrogating apparatus, removing the need for an extrinsic optical source to probe the sensor. | 12-01-2011 |
Stephen J. Mihailov, Kanafa CA
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20090317928 | HIGH TEMPERATURE STABLE FIBER GRATING SENSOR AND METHOD FOR PRODUCING SAME - A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. and where the grating is relatively stable and has very low loss from scatter. These gratings have spectral characteristics that allow them to be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000° C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide. | 12-24-2009 |
Stephen J. Mihailov, Kanata CA
Patent application number | Description | Published |
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20080310789 | Method of Changing the Birefringence of an Optical Waveguide by Laser Modification of the Cladding - A method of inducing birefringence in an optical waveguide is disclosed wherein the waveguide cladding is irradiated with energy of a sufficient intensity so as to induce a stress in the optical waveguide so as to cause a multitude of spaced stress induced regions within the cladding of the optical waveguide such that there are 10 to 5000 spaced regions per mm and wherein the stress induced regions are proximate the core greater than 2 microns distance from the core-cladding interface. This waveguide has numerous uses, for example a fiber sensor. | 12-18-2008 |
20090041405 | Ridge waveguide optical sensor incorporating a Bragg grating - An optical sensor for sensing information relating to an analyte liquid or gas, has a a planar substrate having a refractive index n | 02-12-2009 |
20120324959 | HIGH TEMPERATURE STABLE FIBER GRATING SENSOR AND METHOD FOR PRODUCING SAME - A method of producing a thermally stable grating allows the grating to be placed in environments where temperatures reach 1000° C. These gratings may be concatenated so as to form a sensor array. The method requires a step of lowering the characteristic intensity threshold of a waveguide by at least 25%, followed by irradiating the waveguide with femtosecond pulses of light having a sufficient intensity and for a sufficient duration to write the grating so that at least 60% of the grating remains after exposures of at least 10 hours at a temperature of at least 1000° C. Pre-writing a Type I grating before writing a minimal damage Type II grating lowers the characteristic threshold of the waveguide so that a stable low damage type II grating can be written; alternatively providing a hydrogen or deuterium loaded waveguide before writing the grating lowers the characteristic threshold of the waveguide. | 12-27-2012 |