Search Patents
-
Patent number: 7327914Abstract: Optical signals are passed in an optical medium using an approach that facilitates the mitigation of interference. According to an example embodiment, a filtering-type approach is used with an optical signal conveyed in an optical fiber, such as a multimode fiber (MMF) or a multimode waveguide. Modal dispersion in the optical signal is mitigated.Type: GrantFiled: August 10, 2004Date of Patent: February 5, 2008Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Joseph M. Kahn, Mark A. Horowitz, Olav Solgaard, Shanhui Fan
-
Publication number: 20030030870Abstract: A system for dispersion compensation is provided including a plurality of optical cavities with each including a specific resonant frequency and resonant linewidth. At least one coupling element interconnects the optical cavities. The at least one coupling element defines the coupling strength between the cavities. The optical cavities are interconnected with the at least one coupled element that forms a multi-cavity structure. The multi-cavity structure generates appropriate dispersion properties for dispersion compensation purposes.Type: ApplicationFiled: June 25, 2002Publication date: February 13, 2003Inventors: John D. Joannopoulos, Shanhui Fan, Michal Lispon, Kevin M. Chen, Lionel C. Kimerling
-
Patent number: 7190853Abstract: A system for dispersion compensation is provided including a plurality of optical cavities with each including a specific resonant frequency and resonant linewidth. At least one coupling element interconnects the optical cavities. The at least one coupling element defines the coupling strength between the cavities. The optical cavities are interconnected with the at least one coupled element that forms a multi-cavity structure. The multi-cavity structure generates appropriate dispersion properties for dispersion compensation purposes.Type: GrantFiled: June 25, 2002Date of Patent: March 13, 2007Assignee: Massachusetts Institute of TechnologyInventors: John D. Joannopoulos, Shanhui Fan, Michal Lispon, Kevin M. Chen, Lionel C. Kimerling
-
Patent number: 7509002Abstract: Optical signals are passed in an optical medium using an approach that facilitates the mitigation of interference. According to an example embodiment, a filtering-type approach is used with an optical signal conveyed in an optical fiber, such as a multimode fiber (MMF) or a multimode waveguide. Adaptive spatial domain signal processing, responsive to a feedback signal indicative of data conveyed in the multimode waveguide, is used to mitigate interference in optical signals conveyed in the multimode waveguide.Type: GrantFiled: November 14, 2007Date of Patent: March 24, 2009Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Joseph M. Kahn, Mark A. Horowitz, Olav Solgaard, Shanhui Fan
-
Patent number: 7844144Abstract: Optical signals are passed in an optical medium using an approach that facilitates the mitigation of interference. According to an example embodiment, a filtering-type approach is used with an optical signal conveyed in an optical fiber, such as a multimode fiber (MMF) or a multimode waveguide. Adaptive spatial domain signal processing, responsive to a feedback signal indicative of data conveyed in the multimode waveguide, is used to mitigate interference in optical signals conveyed in the multimode waveguide.Type: GrantFiled: March 11, 2009Date of Patent: November 30, 2010Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Joseph M. Kahn, Mark A. Horowitz, Olav Solgaard, Shanhui Fan
-
Patent number: 6853789Abstract: A method of making a low-loss electromagnetic wave resonator structure. The method includes providing a resonator structure, the resonator structure including a confining device and a surrounding medium. The resonator structure supporting at least one resonant mode, the resonant mode displaying a near-field pattern in the vicinity of said confining device and a far-field radiation pattern away from the confining device. The surrounding medium supports at least one radiation channel into which the resonant mode can couple. The resonator structure is specifically configured to reduce or eliminate radiation loss from said resonant mode into at least one of the radiation channels, while keeping the characteristics of the near-field pattern substantially unchanged.Type: GrantFiled: June 19, 2001Date of Patent: February 8, 2005Inventors: Attila Mekis, Shanhui Fan, John D. Joannopoulos, Pierre Villeneuve
-
Patent number: 7155087Abstract: We introduce a mechanically tunable photonic crystal structure consisting of coupled photonic crystal slabs. Using both analytic theory, and first-principles finite-difference time-domain simulations, we demonstrate that the transmission and reflection coefficients for light normally incident upon such structures can be highly sensitive to nano-scale variations in the spacing between the slabs. Moreover, by specifically configuring the photonic crystal structures, the high sensitivity can be preserved in spite of significant fabrication-related disorders. We expect such a structure to play important roles in micro-mechanically tunable optical sensors and filters.Type: GrantFiled: October 8, 2003Date of Patent: December 26, 2006Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Wonjoo Suh, Mehmet Fatih Yanik, Olav Solgaard, Shanhui Fan
-
Patent number: 7412127Abstract: We introduce a mechanically tunable photonic crystal structure consisting of coupled photonic crystal slabs. Using both analytic theory, and first-principles finite-difference time-domain simulations, we demonstrate that the transmission and reflection coefficients for light normally incident upon such structures can be highly sensitive to nano-scale variations in the spacing between the slabs. Moreover, by specifically configuring the photonic crystal structures, the high sensitivity can be preserved in spite of significant fabrication-related disorders. We expect such a structure to play important roles in micro-mechanically tunable optical sensors and filters.Type: GrantFiled: August 15, 2006Date of Patent: August 12, 2008Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Wonjoo Suh, Mehmet Fatih Yanik, Olav Solgaard, Shanhui Fan
-
Patent number: 7269313Abstract: Light pulses can be stopped and stored coherently, with an all-optical process that involves an adiabatic and reversible pulse bandwidth compression occurring entirely in the optical domain. Such a process overcomes the fundamental bandwidth-delay constraint in optics, and can generate arbitrarily small group velocities for light pulses with a given bandwidth, without the use of any coherent or resonant light-matter interactions. This is accomplished only by small refractive index modulations performed at moderate speeds and has applications ranging from quantum communications and computing to coherent all-optical memory devices. A complete time reversal and/or temporal/spectral compression and expansion operation on any electromagnetic field is accomplished using only small refractive index modulations and linear optical elements.Type: GrantFiled: November 30, 2004Date of Patent: September 11, 2007Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Mehmet Fatih Yanik, Shanhui Fan
-
Patent number: 6574383Abstract: An input light-coupling device comprising a dielectric layer containing a pattern of dielectric contrast distributed in at least two dimensions. The pattern of dielectric contrast, which may or may not be periodic, is designed to facilitate coupling to the dielectric layer of electromagnetic radiation. The electromagnetic radiation may be propagating within a surrounding medium of lower dielectric constant than that of said dielectric layer, input at directions including normal incidence from which light cannot typically couple to the dielectric layer without the presence of the pattern of dielectric contrast. The input light may constitute an optical signal propagating in an optical fiber or in free space. Light that is in-coupled may be directed in as many directions as dictated by the symmetry of the pattern of dielectric contrast. The dielectric layer may contain output waveguides surrounding the input coupling structure.Type: GrantFiled: April 30, 2001Date of Patent: June 3, 2003Assignee: Massachusetts Institute of TechnologyInventors: Alexei A. Erchak, Shanhui Fan, Erich P. Ippen, John D. Joannopoulos, Leslie A. Kolodziejski, Gale S. Petrich, Daniel J. Ripin