Patents by Inventor Desmond R. Lim
Desmond R. Lim 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: 7787176Abstract: An on-chip amplifier includes first element that curtails the velocity of an incoming light to the amplifier. A second element is doped so as to make the frequency of the incoming light equal to the electron frequency in order to allow for electron-photon wave interaction, so that when current flows through the amplifier, electron power is transferred to the incoming light, resulting in amplification of the incoming light.Type: GrantFiled: September 4, 2002Date of Patent: August 31, 2010Assignee: Massachusetts Institute of TechnologyInventors: Lionel C. Kimerling, Kazumi Wada, Daniel K. Sparacin, Desmond R. Lim
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Patent number: 7352934Abstract: An optical cavity structure for bending optical signals is provided. The optical cavity structure includes an input port for receiving input optical signals from a first waveguide. The optical cavity structure also includes an interconnecting structure that receives said input optical signals and interconnects said first waveguide to a second waveguide, the interconnecting structure further includes at least four straight edges that orthogonal and of a finite width. The optical cavity structure further includes an output port coupled to the interconnecting structure for providing the second waveguide with the input optical signals. Further, the optical cavity structure may be used to create three dimensional splitter devices and resonators.Type: GrantFiled: November 28, 2001Date of Patent: April 1, 2008Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Christina Manolatou, Paul Maki, Kevin K. Lee, Kazumi Wada, Hermann A. Haus, Lionel C. Kimerling
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Patent number: 7346238Abstract: A high index difference coupler includes a high index difference waveguide having one or more modes. A plurality of gratings is formed on the high index difference waveguide. The effective index difference between low index regions and high index regions of the waveguide is greater than 0.3.Type: GrantFiled: July 16, 2002Date of Patent: March 18, 2008Assignee: Massachusetts Institute of TechnologyInventors: Lionel C. Kimerling, Desmond R. Lim
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Patent number: 7238412Abstract: An optical device is provided. The optical device includes a plurality of high index layers. The optical device also includes a plurality of low index layers. The optical device is formed by creating alternating layers of the plurality of high layers and the plurality of low index layers, such that electricity and heat is allowed to be conducted through said optical device.Type: GrantFiled: November 29, 2001Date of Patent: July 3, 2007Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Kazumi Wada, Lionel C. Kimerling
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Patent number: 7164837Abstract: One or more embodiments of the instant invention may be briefly summarized as follows. A planarization and smoothing segment includes: (a) a reverse mask and etching method; a sacrificial layer and selective CMP followed by non selective CMP; or a sacrificial layer and selective etching followed by non-selective CMP. A buffer layer to protect wave guide segment includes: (a) waveguide formation followed by buffer layer deposition; or a buffer deposition over the waveguide layer followed by waveguide formation.Type: GrantFiled: December 3, 2003Date of Patent: January 16, 2007Assignees: Agency for Science, Technology and Research, Photonics Concepts Pte. Ltd.Inventors: Joon Mo Kang, My The Doan, Desmond R. Lim
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Patent number: 7103245Abstract: A high density integrated optical chip. The optical chip features an optical function connected to a low minimum bending radius dielectric waveguide, and a large mode field size dielectric waveguide to interface with an external optical device, such as an optical fiber. The large mode field size dielectric waveguide is optically connected to the low minimum bending radius dielectric waveguide on the optical chip.Type: GrantFiled: January 9, 2002Date of Patent: September 5, 2006Assignee: Massachusetts Institute of TechnologyInventors: Kevin K. Lee, Desmond R. Lim, Kazumi Wada, Lionel C. Kimmerling
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Patent number: 7092590Abstract: Methods of tuning, switching or modulating, or, in general, changing the resonance of waveguide micro-resonators. Changes in the resonance can be brought about, permanently or temporarily, by changing the size of the micro-resonator with precision, by changing the local physical structure of the device or by changing the effective and group indices of refraction of the mode in the micro-resonator. Further changing the asymmetry of the index profile around a waveguide can alter the birefringence of the waveguide and allows one to control the polarization in the waveguide. This change in index profile may be used to change the polarization dependence or birefringence of the resonators.Type: GrantFiled: September 21, 2001Date of Patent: August 15, 2006Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Lionel C. Kimerling
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Patent number: 7068862Abstract: Methods of tuning, switching or modulating, or, in general, changing the resonance of waveguide micro-resonators. Changes in the resonance can be brought about, permanently or temporarily, by changing the size of the micro-resonator with precision, by changing the local physical structure of the device or by changing the effective and group indices of refraction of the mode in the micro-resonator. Further changing the asymmetry of the index profile around a waveguide can alter the birefringence of the waveguide and allows one to control the polarization in the waveguide. This change in index profile may be used to change the polarization dependence or birefringence of the resonators.Type: GrantFiled: September 21, 2001Date of Patent: June 27, 2006Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Lionel C. Kimerling
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Patent number: 7031561Abstract: A chip for integrating functions performed by micro-optics and RF circuits including at least one optical function module that receives an optical signal and performs at least one of a plurality of optical functions. A RF function module that receives a RF signal and perform at least one of a plurality of RF functions. The at least one optical function module and the RF function module provides a monolithic integration of optics and RF circuits on the chip.Type: GrantFiled: June 21, 2002Date of Patent: April 18, 2006Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Lionel C. Kimerling
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Patent number: 6934427Abstract: The invention features an optical chip having optical functions in large mode size waveguides. Under one aspect of the invention, the optical chip features one or more large mode field size waveguides, one or more low minimum bending radius waveguides to interconnect the large mode field size waveguides, and one or more optical functions integrated within or connected to the large mode field size waveguides.Type: GrantFiled: March 12, 2002Date of Patent: August 23, 2005Assignee: Enablence Holdings LLCInventors: Kevin K. Lee, Desmond R. Lim
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Patent number: 6925226Abstract: Methods of tuning, switching or modulating, or, in general, changing the resonance of waveguide micro-resonators. Changes in the resonance can be brought about, permanently or temporarily, by changing the size of the micro-resonator with precision, by changing the local physical structure of the device or by changing the effective and group indices of refraction of the mode in the micro-resonator. Further changing the asymmetry of the index profile around a waveguide can alter the birefringence of the waveguide and allows one to control the polarization in the waveguide. This change in index profile may be used to change the polarization dependence or birefringence of the resonators.Type: GrantFiled: August 1, 2003Date of Patent: August 2, 2005Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Lionel C. Kimerling
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Patent number: 6915029Abstract: The invention features a programmable optical chip. The optical chip has a plurality of optical functions, each of which is connected to a waveguide having a core and a cladding. A photosensitive layer is disposed between at least three of the waveguides, and the photosensitive layer has a refractive index similar to that of the cladding prior to exposure to irradiation. The photosensitive layer changes refractive index upon exposure to irradiation to selectively form an optical connection between at least two of the waveguides.Type: GrantFiled: March 7, 2003Date of Patent: July 5, 2005Assignee: LNL Technologies, Inc.Inventors: Kevin K. Lee, Desmond R. Lim
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Patent number: 6850683Abstract: A method of reducing the scattering losses that involves smoothing of the core/cladding interface and/or change of waveguide geometry in high refractive index difference waveguides. As an example, the SOI-based Si/SiO2 waveguides are subjected to an oxidation reaction at high temperatures, after the waveguide patterning process. By oxidizing the rough silicon core surfaces after the patterning process, the core/cladding interfaces are smoothened, reducing the roughness scattering in waveguides.Type: GrantFiled: June 7, 2001Date of Patent: February 1, 2005Assignee: Massachusetts Institute of TechnologyInventors: Kevin K. Lee, Desmond R. Lim, Kazumi Wada, Lionel C. Kimerling
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Publication number: 20040258360Abstract: An external gain system includes a gain source, a laser coupler, one or more mode converters, a high index contrast waveguide, and a filter structure fabricated on either high or low index contrast waveguides. The filter structure defines the external cavity with the front facet of the laser diode. An external cavity laser is further integrated with one or more functional blocks to perform a specific function. A multiplexer is integrated with the external cavity laser array, where the waveguide ends of the external cavity serve as an input to the multiplexer, to form an integrated WDM transmitter. The output of the transmitter, if fabricated on high index contrast waveguide, is then coupled to a low index waveguide or fiber matched waveguide by using a mode converter. The gain system can be configured to become a linear optical amplifier and can also be configured as a low cost wavelength converter.Type: ApplicationFiled: March 25, 2004Publication date: December 23, 2004Inventors: Desmond R. Lim, Dong Pan, Christian Hoepfner, Wang-Yuhl Oh, Kevin Kidoo Lee
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Patent number: 6804440Abstract: An integrated device includes a waveguide, which may be connected to a photonic circuit and an external fiber, and an on-chip device formed on an optical chip by forming a region in which the waveguide terminates. The region is bounded by reflective surfaces. Light coming from the waveguide is essentially trapped inside the region and directed to an on-chip device disposed in the region. An integrated device consists of a low index difference waveguide, an on-chip mode converter, a high index difference waveguide, and an on-chip function formed on a single optical chip so that the high index difference waveguide is close to the substrate surface upon which the mode converter is formed. Substrate surface height differences are provided to define different substrate surface mounting heights for a low index difference waveguide, high index difference waveguide, a mode converter, and an on-chip device.Type: GrantFiled: December 7, 2002Date of Patent: October 12, 2004Assignee: LNL Technologies, Inc.Inventors: Kevin K. Lee, Desmond R. Lim, Tae H. Park
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Publication number: 20040120677Abstract: One or more embodiments of the instant invention may be briefly summarized as follows. A planarization and smoothing segment includes: (a) a reverse mask and etching method; a sacrificial layer and selective CMP followed by non selective CMP; or a sacrificial layer and selective etching followed by non-selective CMP. A buffer layer to protect wave guide segment includes: (a) waveguide formation followed by buffer layer deposition; or a buffer deposition over the waveguide layer followed by waveguide formation.Type: ApplicationFiled: December 3, 2003Publication date: June 24, 2004Applicant: Agency For Science, Technology and ResearchInventors: Joon Mo Kang, My The Doan, Desmond R. Lim
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Patent number: 6751368Abstract: Methods of tuning, switching or modulating, or, in general, changing the resonance of waveguide micro-resonators. Changes in the resonance can be brought about, permanently or temporarily, by changing the size of the micro-resonator with precision, by changing the local physical structure of the device or by changing the effective and group indices of refraction of the mode in the micro-resonator. Further changing the asymmetry of the index profile around a waveguide can alter the birefringence of the waveguide and allows one to control the polarization in the waveguide. This change in index profile may be used to change the polarization dependence or birefringence of the resonators.Type: GrantFiled: September 21, 2001Date of Patent: June 15, 2004Assignee: Massachusetts Institute of TechnologyInventors: Desmond R. Lim, Kevin K. Lee, Lionel C. Kimerling
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Publication number: 20040028314Abstract: The invention features a programmable optical chip. The optical chip has a plurality of optical functions, each of which is connected to a waveguide having a core and a cladding. A photosensitive layer is disposed between at least three of the waveguides, and the photosensitive layer has a refractive index similar to that of the cladding prior to exposure to irradiation. The photosensitive layer changes refractive index upon exposure to irradiation to selectively form an optical connection between at least two of the waveguides.Type: ApplicationFiled: March 7, 2003Publication date: February 12, 2004Applicant: LNL Technologies, Inc.Inventors: Kevin K. Lee, Desmond R. Lim
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Publication number: 20040022474Abstract: Methods of tuning, switching or modulating, or, in general, changing the resonance of waveguide micro-resonators. Changes in the resonance can be brought about, permanently or temporarily, by changing the size of the micro-resonator with precision, by changing the local physical structure of the device or by changing the effective and group indices of refraction of the mode in the micro-resonator. Further changing the asymmetry of the index profile around a waveguide can alter the birefringence of the waveguide and allows one to control the polarization in the waveguide. This change in index profile may be used to change the polarization dependence or birefringence of the resonators.Type: ApplicationFiled: August 1, 2003Publication date: February 5, 2004Inventors: Desmond R. Lim, Lionel C. Kimerling
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Publication number: 20040017962Abstract: An integrated device includes a waveguide, which may be connected to a photonic circuit and an external fiber, and an on-chip device formed on an optical chip by forming a region in which the waveguide terminates. The region is bounded by reflective surfaces Light coming from the waveguide is essentially trapped inside the region and directed to an on-chip device disposed in the region.Type: ApplicationFiled: December 7, 2002Publication date: January 29, 2004Inventors: Kevin K. Lee, Desmond R. Lim, Tae H. Park