Search Patents
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Publication number: 20090052829Abstract: An optical device includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber has a longitudinal axis and is twisted about the longitudinal axis.Type: ApplicationFiled: August 19, 2008Publication date: February 26, 2009Inventors: Matthew A. Terrel, Michel J.F. Digonnet, Shanhui Fan
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Publication number: 20100021115Abstract: An optical device includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber is adjustably axially twisted.Type: ApplicationFiled: October 7, 2009Publication date: January 28, 2010Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Matthew A. Terrel, Michel J.F. Digonnet, Shanhui Fan
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Patent number: 8965164Abstract: An optical device includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber is adjustably axially twisted.Type: GrantFiled: October 7, 2009Date of Patent: February 24, 2015Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Matthew A. Terrel, Michel J. F. Digonnet, Shanhui Fan
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Patent number: 7620283Abstract: An optical device includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber has a longitudinal axis and is twisted about the longitudinal axis.Type: GrantFiled: August 19, 2008Date of Patent: November 17, 2009Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Matthew A. Terrel, Michel J. F. Digonnet, Shanhui Fan
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Patent number: 7430345Abstract: A polarization controller is provided. The polarization controller includes a hollow-core photonic-bandgap fiber, wherein at least a portion of the hollow-core photonic-bandgap fiber has a longitudinal axis and is twisted about the longitudinal axis.Type: GrantFiled: March 1, 2007Date of Patent: September 30, 2008Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Matthew A. Terrel, Michel J. F. Digonnet, Shanhui Fan
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Publication number: 20090175584Abstract: An optical fiber includes a cladding with a material having a first refractive index and a pattern of regions formed therein. Each of the regions has a second refractive index lower than the first refractive index. The optical fiber further includes a core region and a core ring having an inner perimeter, an outer perimeter, and a thickness between the inner perimeter and the outer perimeter. The thickness is sized to reduce the number of ring surface modes supported by the core ring.Type: ApplicationFiled: January 20, 2009Publication date: July 9, 2009Applicant: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J.F. Digonnet, Vinayak Dangui
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Patent number: 8428412Abstract: An optical fiber includes a cladding with a material having a first refractive index and a pattern of regions formed therein. Each of the regions has a second refractive index lower than the first refractive index. The optical fiber further includes a core region and a core ring having an inner perimeter, an outer perimeter, and a thickness between the inner perimeter and the outer perimeter. The thickness is sized to reduce the number of ring surface modes supported by the core ring.Type: GrantFiled: January 20, 2009Date of Patent: April 23, 2013Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J. F. Digonnet, Vinayak Dangui
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Patent number: 7489848Abstract: An optical fiber includes a cladding with a material having a first refractive index and a pattern of regions formed therein. Each of the regions has a second refractive index lower than the first refractive index. The optical fiber further includes a core region and a core ring surrounding the core region and having an inner perimeter, an outer perimeter, and a thickness between the inner perimeter and the outer perimeter. The thickness is sized to reduce the number of ring surface modes supported by the core ring.Type: GrantFiled: January 8, 2008Date of Patent: February 10, 2009Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J. F. Digonnet, Vinayak Dangui
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Patent number: 7400806Abstract: A photonic-bandgap fiber includes a photonic crystal lattice with a material having a first refractive index and a pattern of regions formed therein. Each of the regions has a second refractive index lower than the first refractive index. The photonic-bandgap fiber further includes a core and a core ring surrounding the core and having an inner perimeter, an outer perimeter, and a thickness between the inner perimeter and the outer perimeter. The thickness is sized to reduce the number of ring surface modes supported by the core ring.Type: GrantFiled: April 19, 2007Date of Patent: July 15, 2008Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J. F. Digonnet, Vinayak Dangui
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Publication number: 20020025130Abstract: A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.Type: ApplicationFiled: October 14, 1999Publication date: February 28, 2002Inventors: YOEL FINK, SHANHUI FAN, JOHN D. JOANNOPOULOS, CHIPING CHEN, EDWIN L. THOMAS
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Publication number: 20020191929Abstract: A device having at least one dielectric inner core region in which electromagnetic radiation is confined, and at least two dielectric outer regions surrounding the inner core region, each with a distinct refractive index. The outer regions confine electromagnetic radiation within the inner core region. The refractive indices, the number of outer regions, and thickness of the outer regions result in a reflectivity for a planar geometry that is greater than 95% for angles of incidence ranging from 0° to at least 80° for all polarizations for a range of wavelengths of the electromagnetic radiation. In exemplary embodiments, the inner core region is made of a low dielectric material, and the outer regions include alternating layers of low and high dielectric materials. In one aspect of the invention, the device is a waveguide, and in another aspect the device is a microcavity.Type: ApplicationFiled: August 1, 2002Publication date: December 19, 2002Applicant: Massachusetts Institute of Technology, a Massachusetts corporationInventors: Yoel Fink, Shanhui Fan, Edwin Thomas, Chiping Chen, John Joannopoulos
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Creating large bandwidth line defects by embedding dielectric waveguides into photonic crystal slabs
Patent number: 6957003Abstract: We introduce a general designing procedure that allows us, for any given photonic crystal slab, to create an appropriate line defect structure that possesses single-mode bands with large bandwidth and low dispersion within the photonic band gap region below the light line. This procedure involves designing a high index dielectric waveguide that is phase matched with the gap of the photonic crystal slab, and embedding the dielectric waveguide as a line defect into a crystal in a specific configuration that is free of edge states within the guiding bandwidth. As an example, we show a single mode line defect waveguide with a bandwidth approaching 13% of the center-band frequency, and with a linear dispersion relation throughout most of the bandwidth.Type: GrantFiled: November 8, 2002Date of Patent: October 18, 2005Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Wah Tung Lau, Shanhui Fan -
Patent number: 7110650Abstract: Coupling of core modes to surface modes in an air-core photonic-bandgap fiber (PBF) can cause large propagation losses. Computer simulations analyze the relationship between the geometry and the presence of surface modes in PBFs having a triangular hole pattern and identify ranges of core characteristic dimensions (e.g., radii) for which the fiber supports no surface modes (i.e., only core modes are present) over the entire wavelength range of the bandgap. In particular, for a hole spacing ? and a hole radius ?=0.47?, the core supports a single mode and supports no surface modes for core radii between about 0.68? and about 1.05?. The existence of surface modes can be predicted simply and expediently by studying either the bulk modes alone or the geometry of the fiber without requiring a full analysis of the defect modes.Type: GrantFiled: September 10, 2004Date of Patent: September 19, 2006Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J. F. Digonnet
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Patent number: 7228041Abstract: A photonic-bandgap fiber includes a photonic crystal lattice with a first material having a first refractive index and a pattern of a second material formed therein. The second material has a second refractive index lower than the first refractive index. The photonic crystal lattice has a plurality of first regions that support intensity lobes of the highest frequency bulk mode and has a plurality of second regions that do not support intensity lobes of the highest frequency bulk mode. The photonic-bandgap fiber further includes a central core formed in the photonic crystal lattice. The photonic-bandgap fiber further includes a core ring having an outer perimeter. The core ring surrounds the central core, wherein the outer perimeter of the core ring passes only through the second regions of the photonic crystal lattice.Type: GrantFiled: May 6, 2005Date of Patent: June 5, 2007Assignee: The Board of Trustees of the Leland Stanford Junior UniversityInventors: Hyang Kyun Kim, Shanhui Fan, Gordon S. Kino, Jonghwa Shin, Michel J. F. Digonnet, Vinayak Dangui