Patents by Inventor Mohammed Nazrul Islam
Mohammed Nazrul Islam has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20140114739Abstract: A company's coupons or advertisements can be posted on a social business network. A company needs to be registered first with the social business network before it can post its coupons and advertisements; while a consumer can view the coupons and advertisements freely with no requirement of registration. The company can either fill a coupon request form to make the network to generate a coupon for it, or create a coupon themselves and then upload it to the network. The registered company can also post its advertisement. Before anything is posted on the website, it will be reviewed to make sure its content is appropriate. The method also allows a company to purchase a time slot to use a live video screen for marketing.Type: ApplicationFiled: October 23, 2013Publication date: April 24, 2014Inventor: Mohammed Nazrul ISLAM
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Patent number: 8649631Abstract: Disclosed is a distortion invariant system, method and computer readable medium for detecting the presence of one or more predefined targets in an input image. The input image and a synthetic discriminant function (SDF) reference image are correlated in a shift phase-encoded fringe-adjusted joint transform correlation (SPFJTC) correlator yielding a correlation output. A peak-to-clutter ratio (PCR) is determined for the correlation output and compared to a threshold value. A predefined target is present in the input image when the PCR is greater than or equal to the threshold value.Type: GrantFiled: February 4, 2013Date of Patent: February 11, 2014Assignee: Old Dominion University Research FoundationInventors: Mohammed Nazrul Islam, K. Vijayan Asari, Mohammad A. Karim
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Publication number: 20130148915Abstract: Disclosed is a distortion invariant system, method and computer readable medium for detecting the presence of one or more predefined targets in an input image. The input image and a synthetic discriminant function (SDF) reference image are correlated in a shift phase-encoded fringe-adjusted joint transform correlation (SPFJTC) correlator yielding a correlation output. A peak-to-clutter ratio (PCR) is determined for the correlation output and compared to a threshold value. A predefined target is present in the input image when the PCR is greater than or equal to the threshold value.Type: ApplicationFiled: February 4, 2013Publication date: June 13, 2013Inventors: Mohammed Nazrul Islam, K. Vijayan Asari, Mohammad A. Karim
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Publication number: 20130142424Abstract: Disclosed is a distortion invariant system, method and computer readable medium for detecting the presence of one or more predefined targets in an input image. The input image and a synthetic discriminant function (SDF) reference image are correlated in a shift phase-encoded fringe-adjusted joint transform correlation (SPFJTC) correlator yielding a correlation output. A peak-to-clutter ratio (PCR) is determined for the correlation output and compared to a threshold value. A predefined target is present in the input image when the PCR is greater than or equal to the threshold value.Type: ApplicationFiled: February 4, 2013Publication date: June 6, 2013Inventors: Mohammed Nazrul Islam, K. Vijayan Asari, Mohammad A. Karim
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Patent number: 8401332Abstract: Disclosed is a distortion invariant system, method and computer readable medium for detecting the presence of one or more predefined targets in an input image. The input image and a synthetic discriminant function (SDF) reference image are correlated in a shift phase-encoded fringe-adjusted joint transform correlation (SPFJTC) correlator yielding a correlation output. A peak-to-clutter ratio (PCR) is determined for the correlation output and compared to a threshold value. A predefined target is present in the input image when the PCR is greater than or equal to the threshold value.Type: GrantFiled: April 23, 2009Date of Patent: March 19, 2013Assignee: Old Dominion University Research FoundationInventors: Mohammed Nazrul Islam, K. Vijayan Asari, Mohammad A. Karim
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Publication number: 20090297021Abstract: Disclosed is a distortion invariant system, method and computer readable medium for detecting the presence of one or more predefined targets in an input image. The input image and a synthetic discriminant function (SDF) reference image are correlated in a shift phase-encoded fringe-adjusted joint transform correlation (SPFJTC) correlator yielding a correlation output. A peak-to-clutter ratio (PCR) is determined for the correlation output and compared to a threshold value. A predefined target is present in the input image when the PCR is greater than or equal to the threshold value.Type: ApplicationFiled: April 23, 2009Publication date: December 3, 2009Inventors: Mohammed Nazrul Islam, K. Vijayan Asari, Mohammad A. Karim
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Patent number: 6606187Abstract: An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths &lgr;r should lie in close proximity to the zero-dispersion wavelength &lgr;0 of the amplifying fiber.Type: GrantFiled: October 23, 2000Date of Patent: August 12, 2003Assignees: The Regents of the University of Michigan, Xtera Communications, Inc.Inventors: Mohammed Nazrul Islam, Hayden Henry Harris
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Patent number: 6400870Abstract: Unbalanced Mach-Zehnder interferometers (MZI) are useful for a number of applications including wavelength filters, gain flattening or gain equalization elements, and band splitters or combiners. A MZI is comprised of two couplers surrounding a phase shifting region, which consists of two arms with differential propagation constants. We disclose a means of using light exposure to unbalance a symmetric MZI consisting of substantially the same lengths of substantially the same fiber. In particular, the index of refraction of a fiber can be increased by exposure to ultraviolet light, and the magnitude of the change can be increased by using higher germanium doping or by hydrogen loading the fiber. The magnitude of the phase shift can be controlled accurately by varying the fiber length exposed, the light exposure intensity, the light exposure time, and the hydrogen loading or fiber composition.Type: GrantFiled: January 10, 2000Date of Patent: June 4, 2002Assignee: Her Majesty the Queen in Right of Canada as represented by the Secretary of State for IndustryInventors: Kenneth O. Hill, Mohammed Nazrul Islam
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Patent number: 6239902Abstract: An apparatus and method are described for exploiting almost the full almost 25TH% of bandwidth available in the low-loss window in optical fibers (from 1430 nm-1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths &lgr;r should lie in close proximity to the zero-dispersion wavelength &lgr;0 of the amplifying fiber.Type: GrantFiled: May 5, 2000Date of Patent: May 29, 2001Assignees: Xtera Communciations Inc., Regents of the University of MichiganInventors: Mohammed Nazrul Islam, Hayden Henry Harris
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Patent number: 6239903Abstract: An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths &lgr;r should lie in close proximity to the zero-dispersion wavelength &lgr;0 of the amplifying fiber.Type: GrantFiled: April 25, 2000Date of Patent: May 29, 2001Assignees: Xtera Communications, Inc., Regents of the University of MichiganInventors: Mohammed Nazrul Islam, Hayden Henry Harris
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Patent number: 6229937Abstract: The invention is directed to circularly polarized single mode waveguide fiber and to high data rate, multiplexed transmission systems that employ this fiber. The circularly polarized waveguide fiber attenuates the non-linear effects present in such high performance transmission links. In particular, self phase modulation is attenuated by more than 30% and four wave mixing is essentially eliminated. This latter effect occurs because four wave mixing does not occur when a multiplexed link is made of a plurality of circularly polarized waveguide fibers which are arranged so that adjacent fibers have opposite circular polarization. The circularly polarized fiber enhances the non-linear effect of cross phase modulation, a feature that can be used in optical switching components associated with the transmission link. In addition, the strength of the XPM in CPF is independent of the relative polarization states of the signal and control pulses.Type: GrantFiled: June 24, 1999Date of Patent: May 8, 2001Assignee: Corning IncorporatedInventors: Daniel Aloysius Nolan, Mohammed Nazrul Islam
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Patent number: 6101024Abstract: An apparatus and method are described for exploiting almost the full almost 25 THz of bandwidth available in the low-loss window in optical fibers (from 1430 nm to 1620 nm) using a parallel combination of optical amplifiers. The low-loss window at about 1530 nm-1620 nm can be amplified using erbium-doped fiber amplifiers (EDFAs). However, due to the inherent absorption of the erbium at shorter wavelengths, EDFAs cannot be used below about 1525 nm without a significant degradation in performance. For the low-loss window at approximately 1430-1530 nm, amplifiers based on nonlinear polarization in optical fibers can be used effectively. A broadband nonlinear polarization amplifier (NLPA) is disclosed which combines cascaded Raman amplification with parametric amplification or four-wave mixing. In particular, one of the intermediate cascade Raman order wavelengths .lambda..sub.r should lie in close proximity to the zero-dispersion wavelength .lambda..sub.0 of the amplifying fiber.Type: GrantFiled: March 24, 1998Date of Patent: August 8, 2000Assignee: Xtera Communications, Inc.Inventors: Mohammed Nazrul Islam, Hayden Henry Harris
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Patent number: 6052393Abstract: This invention describes new developments in Sagnac Raman amplifiers and cascade lasers to improve their performance. The Raman amplifier bandwidth is broadened by using a broadband pump or by combining a cladding-pumped fiber laser with the Sagnac Raman cavity. The broader bandwidth is also obtained by eliminating the need for polarization controllers in the Sagnac cavity by using an all polarization maintaining configuration, or at least using loop mirrors that maintain polarization. The polarization maintaining cavities have the added benefit of being environmentally stable and appropriate for turn-key operation. The noise arising from sources such as double Rayleigh scattering is reduced by using the Sagnac cavity in combination with a polarization diversity pumping scheme, where the pump is split along two axes of the fiber. This also leads to gain for the signal that is independent of the signal polarization.Type: GrantFiled: July 7, 1998Date of Patent: April 18, 2000Assignee: The Regents of the University of MichiganInventor: Mohammed Nazrul Islam