Patents by Inventor Asghar Gholami
Asghar Gholami 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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Patent number: 8879920Abstract: The present wavelength multiplexed optical system includes a multimode optical fiber that transmits wavelength multiplexed optical signals and a plurality of multimode modal dispersion compensation optical fibers. Each modal dispersion compensation optical fiber can transmit one of the multiplex wavelengths, and each modal dispersion compensation optical fiber has an optimized index profile such that the modal dispersion for the transmitted wavelength is approximately inversely equal to the modal dispersion induced in the multimode optical fiber. The wavelength multiplexed optical system facilitates an increased bitrate without reducing bandwidth.Type: GrantFiled: June 23, 2009Date of Patent: November 4, 2014Assignee: Draka Comteq, B.V.Inventors: Yves Lumineau, Denis Molin, Asghar Gholami
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Patent number: 8630545Abstract: Disclosed is an optical system including a polychromatic optical source emitting multiple transverse modes, an optical link having at least one portion of multimode optical fiber, and an optical device positioned between the optical source and the input of the multimode optical fiber. The optical device can modify the distribution of the energy coupling of the transverse modes emitted by the source in the propagation modes of the multimode optical fiber. The optical system makes it possible to use low-cost transverse multimode optical sources for producing high-bandwidth Ethernet transmission networks having excellent performance.Type: GrantFiled: November 6, 2009Date of Patent: January 14, 2014Assignee: Draka Comteq, B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Patent number: 8432539Abstract: A method of classifying a graded-index multimode optical fiber includes taking a series of individual measurements at a single wavelength, and using the measurements to characterize the departure of the multimode optical fiber's actual index profile from the corresponding nominal index profile. The measurements, coupled with intermodal dispersion or EMB measurement, may be used to predict the approximate transmission properties of the optical fiber at wavelengths other than the measurement wavelength. It is desirable for a graded-index multimode optical fiber to possess, at a wavelength of 850 nanometers, a radial offset bandwidth of at least 6000 MHz·km for all radial offsets between 0 and about 70 percent of the radius of the optical fiber's core.Type: GrantFiled: September 5, 2012Date of Patent: April 30, 2013Assignee: Draka Comteq B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Publication number: 20130051744Abstract: A method of classifying a graded-index multimode optical fiber includes taking a series of individual measurements at a single wavelength, and using the measurements to characterize the departure of the multimode optical fiber's actual index profile from the corresponding nominal index profile. The measurements, coupled with intermodal dispersion or EMB measurement, may be used to predict the approximate transmission properties of the optical fiber at wavelengths other than the measurement wavelength. It is desirable for a graded-index multimode optical fiber to possess, at a wavelength of 850 nanometers, a radial offset bandwidth of at least 6000 MHz·km for all radial offsets between 0 and about 70 percent of the radius of the optical fiber's core.Type: ApplicationFiled: September 5, 2012Publication date: February 28, 2013Applicant: DRAKA COMTEQ B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Patent number: 8274647Abstract: A method of classifying a graded-index multimode optical fiber includes taking a series of individual measurements at a single wavelength, and using the measurements to characterize the departure of the multimode optical fiber's actual index profile from the corresponding nominal index profile. The measurements, coupled with intermodal dispersion or EMB measurement, may be used to predict the approximate transmission properties of the optical fiber at wavelengths other than the measurement wavelength.Type: GrantFiled: January 7, 2010Date of Patent: September 25, 2012Assignee: Draka Comteq, B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Patent number: 8260103Abstract: A multimode optical fiber has an equivalent modal dispersion value (DMDinner&outer) of less than 0.11 ps/m for (??max×D)>0.07 ps/m as measured on a modified DMD graph. The modified DMD graph accounts for chromatic dispersion to ensure that the multimode optical fiber has a calculated effective bandwidth EBc greater than 6000 MHz-km when used with multimode transverse sources.Type: GrantFiled: August 8, 2011Date of Patent: September 4, 2012Assignee: Draka Comteq, B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Publication number: 20110293290Abstract: A multimode optical fiber has an equivalent modal dispersion value (DMDinner&outer) of less than 0.11 ps/m for (??max×D)>0.07 ps/m as measured on a modified DMD graph. The modified DMD graph accounts for chromatic dispersion to ensure that the multimode optical fiber has a calculated effective bandwidth EBc greater than 6000 MHz-km when used with multimode transverse sources.Type: ApplicationFiled: August 8, 2011Publication date: December 1, 2011Applicant: DRAKA COMTEQ B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Patent number: 7995888Abstract: A multimode optical fiber has an equivalent modal dispersion value (DMDinner&outer) of less than 0.11 ps/m for (??max×D)>0.07 ps/m as measured on a modified DMD graph. The modified DMD graph accounts for chromatic dispersion to ensure that the multimode optical fiber has a calculated effective bandwidth EBc greater than 6000 MHz-km when used with multimode transverse sources.Type: GrantFiled: July 7, 2009Date of Patent: August 9, 2011Assignee: Draka Comteq, B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Publication number: 20100171945Abstract: A method of classifying a graded-index multimode optical fiber includes taking a series of individual measurements at a single wavelength, and using the measurements to characterize the departure of the multimode optical fiber's actual index profile from the corresponding nominal index profile. The measurements, coupled with intermodal dispersion or EMB measurement, may be used to predict the approximate transmission properties of the optical fiber at wavelengths other than the measurement wavelength.Type: ApplicationFiled: January 7, 2010Publication date: July 8, 2010Applicant: DRAKA COMTEQ B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Publication number: 20100142969Abstract: Disclosed is an optical system including a polychromatic optical source emitting multiple transverse modes, an optical link having at least one portion of multimode optical fiber, and an optical device positioned between the optical source and the input of the multimode optical fiber. The optical device can modify the distribution of the energy coupling of the transverse modes emitted by the source in the propagation modes of the multimode optical fiber. The optical system makes it possible to use low-cost transverse multimode optical sources for producing high-bandwidth Ethernet transmission networks having excellent performance.Type: ApplicationFiled: November 6, 2009Publication date: June 10, 2010Applicant: DRAKA COMTEQ, B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Publication number: 20100028020Abstract: A multimode optical fiber has an equivalent modal dispersion value (DMDinner&outer) of less than 0.11 ps/m for (??max×D)>0.07 ps/m as measured on a modified DMD graph. The modified DMD graph accounts for chromatic dispersion to ensure that the multimode optical fiber has a calculated effective bandwidth EBc greater than 6000 MHz-km when used with multimode transverse sources.Type: ApplicationFiled: July 7, 2009Publication date: February 4, 2010Applicant: Draka Cornteq B.V.Inventors: Asghar Gholami, Denis Molin, Pierre Sillard, Yves Lumineau
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Publication number: 20100021170Abstract: The present wavelength multiplexed optical system includes a multimode optical fiber that transmits wavelength multiplexed optical signals and a plurality of multimode modal dispersion compensation optical fibers. Each modal dispersion compensation optical fiber can transmit one of the multiplex wavelengths, and each modal dispersion compensation optical fiber has an optimized index profile such that the modal dispersion for the transmitted wavelength is approximately inversely equal to the modal dispersion induced in the multimode optical fiber. The wavelength multiplexed optical system facilitates an increased bitrate without reducing bandwidth.Type: ApplicationFiled: June 23, 2009Publication date: January 28, 2010Applicant: DRAKA COMTEQ B.V.Inventors: Yves Lumineau, Denis Molin, Asghar Gholami