Patents by Inventor Asif A. Godil
Asif A. Godil 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: 8280218Abstract: A tilting mirror MEMS variable optical attenuator attenuates light over a band of wavelengths with minimum wavelength dependent loss. The attenuator includes a lens that has a wedged input face and is made from a material that has high dispersion. The lens design causes different wavelengths to travel different paths through the attenuator such that wavelength dependent loss is reduced. The attenuator may be designed to have minimum wavelength dependent loss at a specified attenuation greater than zero.Type: GrantFiled: July 2, 2009Date of Patent: October 2, 2012Assignee: NeoPhotonics CorporationInventors: Asif A. Godil, Kenneth Honer, Matthew Lawrence, Eric Gustafson
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Patent number: 7986073Abstract: The present invention combines electrostatic comb with parallel plate actuation in a novel design to create a robust low voltage MEMS Micromirror. Other unique advantages of the invention include the ability to close the comb fingers for additional reliability and protection during mirror snapping with over voltage.Type: GrantFiled: November 19, 2010Date of Patent: July 26, 2011Assignee: AG Microsystems Inc.Inventor: Asif A. Godil
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Publication number: 20110102871Abstract: The present invention combines electrostatic comb with parallel plate actuation in a novel design to create a robust low voltage MEMS Micromirror. Other unique advantages of the invention include the ability to close the comb fingers for additional reliability and protection during mirror snapping with over voltage.Type: ApplicationFiled: November 19, 2010Publication date: May 5, 2011Applicant: AG Microsystems, INC.Inventor: Asif A. Godil
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Patent number: 7709354Abstract: A 1×N wavelength selective switch which can function as a dynamic channel equalizer when N=1. In an exemplary arrangement, the present invention is a free-space device that includes a linear array of micromachined reflective elements for beam steering of individual wavelength channels. In at least some embodiments the array of reflective elements of the present invention provides a substantially seamless design such that the optical spectrum appears flat across the transition between actuators. Various embodiments provide high channel bandwidth with flat-top channel performance, low polarization dependence loss, low vibration sensitivity, extinction ratios greater than 40 dB over all temperatures, and very low levels of electrical and optical channel cross-talk.Type: GrantFiled: May 29, 2007Date of Patent: May 4, 2010Assignee: Light Connect, Inc.Inventors: Timothy D. Stowe, Jocelyn Nee, Asif A. Godil
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Publication number: 20100003003Abstract: A tilting mirror MEMS variable optical attenuator attenuates light over a band of wavelengths with minimum wavelength dependent loss. The attenuator includes a lens that has a wedged input face and is made from a material that has high dispersion. The lens design causes different wavelengths to travel different paths through the attenuator such that wavelength dependent loss is reduced. The attenuator may be designed to have minimum wavelength dependent loss at a specified attenuation greater than zero.Type: ApplicationFiled: July 2, 2009Publication date: January 7, 2010Inventors: Asif A. Godil, Kenneth Honer, Matthew Lawrence, Eric Gustafson
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Patent number: 7574096Abstract: A tilting mirror MEMS variable optical attenuator attenuates light over a band of wavelengths with minimum wavelength dependent loss. The attenuator includes a lens that has a wedged input face and is made from a material that has high dispersion. The lens design causes different wavelengths to travel different paths through the attenuator such that wavelength dependent loss is reduced. The attenuator may be designed to have minimum wavelength dependent loss at a specified attenuation greater than zero.Type: GrantFiled: April 10, 2006Date of Patent: August 11, 2009Assignee: Lightconnect, Inc.Inventors: Asif A. Godil, Kenneth Honer, Matthew Lawrence, Eric Gustafson
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Patent number: 7529444Abstract: A 1×N wavelength selective switch which can function as a dynamic channel equalizer when N=1. In an exemplary arrangement, the present invention is a free-space device that includes a linear array of micromachined reflective elements for beam steering of individual wavelength channels. In at least some embodiments the array of reflective elements of the present invention provides a substantially seamless design such that the optical spectrum appears flat across the transition between actuators. Various embodiments provide high channel bandwidth with flat-top channel performance, low polarization dependence loss, low vibration sensitivity, extinction ratios greater than 40 dB over all temperatures, and very low levels of electrical and optical channel cross-talk.Type: GrantFiled: May 29, 2007Date of Patent: May 5, 2009Assignee: NeoPhotonics, Inc.Inventors: Timothy D. Stowe, Jocelyn Nee, Asif A. Godil
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Patent number: 7239774Abstract: A 1×N wavelength selective switch which can function as a dynamic channel equalizer when N=1. In an exemplary arrangement, the present invention is a free-space device that includes a linear array of micromachined reflective elements for beam steering of individual wavelength channels. In at least some embodiments the array of reflective elements of the present invention provides a substantially seamless design such that the optical spectrum appears flat across the transition between actuators. Various embodiments provide high channel bandwidth with flat-top channel performance, low polarization dependence loss, low vibration sensitivity, extinction ratios greater than 40 dB over all temperatures, and very low levels of electrical and optical channel cross-talk.Type: GrantFiled: August 13, 2004Date of Patent: July 3, 2007Assignee: LightConnect, Inc.Inventors: Timothy D Stowe, Jocelyn Nee, Asif A Godil
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Patent number: 7016594Abstract: A simple and robust heat actuated steering device for use with mirrors and other optical components of optical telecommunications equipment is described, together with systems which implement such devices. The device uses differential heating between two legs of a flexured mount to allow tilting that can be used to steer an optical beam. Disturbances in the optical alignment, caused by temperature changes, of an optical device containing this component can be compensated by measuring the device temperature and using this to determine a command signal, for example as provided through a lookup table, to correct for device misalignment. Techniques for calibrating the device and establishing the correction data are also disclosed.Type: GrantFiled: August 9, 2004Date of Patent: March 21, 2006Assignee: Lightconnect, Inc.Inventors: Asif A. Godil, Eric K. Gustafson, Rajeev Patil, Timothy D. Stowe
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Patent number: 6888983Abstract: A beam refraction apparatus includes an input fiber carrying an input beam. A wavelength dispersive element is coupled to the input fiber. The wavelength dispersive element spreads the input beam in at least one dimension as a function of wavelength and generates a dispersed beam. A controllable grating reflects the dispersed beam to the wavelength dispersive element and generates a recombined beam. The controllable grating provides a controllable reflectivity as a function of wavelength. An output fiber receives the recombined beam. A collimating optical member is coupled to the input and output fibers. The collimating optical member passes the input beam and the recombined beams in parallel and opposite directions.Type: GrantFiled: July 6, 2001Date of Patent: May 3, 2005Assignee: LightConnect, Inc.Inventors: Eric K. Gustafson, Asif A. Godil
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Patent number: 6826330Abstract: The present invention is directed towards dynamic spectral shaping. Using a grating, the spectral band is spread across a MEMS or other suitable device array. The device may be the deformable grating modulator invented by Bloom et. al. (U.S. Pat. No. 5,311,360) or other suitable device. The invention also includes the coupling in and out of the fiber and may use polarization optics to ensure the grating is used in only one polarization where the diffraction efficiency is higher.Type: GrantFiled: April 14, 2000Date of Patent: November 30, 2004Assignee: LightConnect, Inc.Inventors: Asif A. Godil, David M. Bloom
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Patent number: 6674563Abstract: Various embodiments are disclosed of apparatuses and methods for linearization. A linearized signal can control, for example, a microelectromechanical device, a microelectromechanical device, and/or a device controlling a modulated intensity of electromagnetic energy. Some embodiments include linearization functions such as a logarithm or x/(a+x).Type: GrantFiled: May 14, 2001Date of Patent: January 6, 2004Assignee: LightConnect, Inc.Inventors: Benjamin Wai-ho Chui, Timothy Stowe, Asif A. Godil
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Publication number: 20030223748Abstract: A design for a 1×N Optical Wavelength Switch incorporates mode conditioning optics which allows seamless control between actuators thus making possible increased channel count (decreasing the channel grid from 100 GHz to 50 GHz) and combining optical channels into groups which can be controlled as a band. In an exemplary embodiment, a new device referred to herein as a Diffractive Steering Element (DSE) is used to implement the invention in a 1×N wavelength selective switch which provides power equalization on a channel-by-channel basis.Type: ApplicationFiled: June 16, 2003Publication date: December 4, 2003Inventors: Timothy D. Stowe, Eric K. Gustafson, David M. Bloom, Asif A. Godil
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Publication number: 20030206701Abstract: A fiber-optic modulator based on a micromachined grating device which is both polarization independent and achromatic in behavior is described. The device is a two dimensional grating or periodic structure which is symmetric in the X and Y axes. It is comprised of a membrane with holes cut in it that moves downward with the application of a voltage which starts diffracting light. The hole region may have a raised island to provide achromatic behavior.Type: ApplicationFiled: April 14, 2003Publication date: November 6, 2003Inventors: Asif A. Godil, Benjamin Wai-Ho Chui, David M. Bloom, Kenneth A. Honer
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Patent number: 6501600Abstract: A fiber-optic modulator based on a micromachined grating device which is both polarization independent and achromatic in behavior is described. The device is a two dimensional grating or periodic structure which is symmetric in the X and Y axes. It is comprised of a membrane with holes cut in it that moves downward with the application of a voltage which starts diffracting light. The hole region may have a raised island to provide achromatic behavior.Type: GrantFiled: April 13, 2000Date of Patent: December 31, 2002Assignee: LightConnect, Inc.Inventors: Asif A. Godil, Benjamin Wai-ho Chui, David M. Bloom, Kenneth A. Honer
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Publication number: 20020061166Abstract: A beam refraction apparatus includes an input fiber carrying an input beam. A wavelength dispersive element is coupled to the input fiber. The wavelength dispersive element spreads the input beam in at least one dimension as a function of wavelength and generates a dispersed beam. A controllable grating reflects the dispersed beam to the wavelength dispersive element and generates a recombined beam. The controllable grating provides a controllable reflectivity as a function of wavelength. An output fiber receives the recombined beam. A collimating optical member is coupled to the input and output fibers. The collimating optical member passes the input beam and the recombined beams in parallel and opposite directions.Type: ApplicationFiled: July 6, 2001Publication date: May 23, 2002Inventors: Eric K. Gustafson, Asif A. Godil
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Publication number: 20020015216Abstract: Various embodiments are disclosed of apparatuses and methods for linearization. A linearized signal can control, for example, a microelectromechanical device, a microelectromechanical device, and/or a device controlling a modulated intensity of electromagnetic energy. Some embodiments include linearization functions such as a logarithm or x/(a+x).Type: ApplicationFiled: May 14, 2001Publication date: February 7, 2002Inventors: Benjamin Wai-Ho Chui, Timothy Stowe, Asif A. Godil
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Patent number: 6268952Abstract: An optical switch uses a micromachined adjustable phase hologram device to route optical signals from an input fiber to selected output fibers is described. The adjustable phase hologram includes a large number of micromachined reflective ribbons which can be individually controlled and adjusted to produce a wide range of phase profiles to route the light beams from the input fiber. This optical switch is capable of dealing directly with optical signals, has fast switching speeds, is capable of routing WDM input signals, is polarization independent, is scalable to large switches, and avoids the complexity of other switches.Type: GrantFiled: July 14, 1999Date of Patent: July 31, 2001Assignee: Lightconnect, Inc.Inventors: Asif A. Godil, David M. Bloom
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Patent number: 6169624Abstract: Micromachined grating modulators which exhibit achromatic behavior are described. One embodiment includes narrow and wide ribbons suspended above a substrate and alternatingly interleaved with each other. Narrow and wide reflective surfaces are formed on the narrow and wide ribbons. Compensating reflective surfaces are formed in the gaps between and beneath the ribbons. The width of the ribbons as well as the width of the gaps and the compensating reflecting surfaces are designed so that incident optical beam can be modulated or attenuated in an achromatic fashion.Type: GrantFiled: August 11, 1999Date of Patent: January 2, 2001Inventors: Asif A. Godil, David M. Bloom
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Patent number: 6040914Abstract: A laser absorption sensor system for performing optical measurements on a sample is described. The sensor system includes a tunable laser, capable of being tuned at rates exceeding 1 KHZ, and with a tuning range approaching 1 GHz. The laser beam is modulated at a modulation frequency between 1 and 100 KHz. Modulation in this frequency range is termed wavelength modulation. The beam is split into two beams, a signal beam and a reference beam. The signal beam traverses the sample where characteristic absorption takes place and is incident on a signal photodetector. The reference beam is incident directly on a reference photodetector. A noise cancellation circuit combines signal and reference photo-currents from signal and reference photodetectors reducing signal noise and increasing system sensitivity. The combination of wavelength modulation and the noise cancellation scheme provide a highly sensitive simple, rugged, low cost laser absorption sensor system.Type: GrantFiled: June 10, 1997Date of Patent: March 21, 2000Assignee: New Focus, Inc.Inventors: Michael L. Bortz, Asif A. Godil