Patents by Inventor Ho Bun Chan
Ho Bun Chan 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: 7212693Abstract: A portable waveguide sensor having one or more gratings. In one embodiment, the sensor has a waveguide, wherein a plurality of grooves imprinted onto the waveguide form a Bragg grating. The surface of the grooves has a functional layer adapted to bind a substance of interest, e.g., a biological pathogen. When the pathogen binds to the functional layer, the binding shifts the spectral reflection band corresponding to the Bragg grating such that a probe light previously reflected by the grating now passes through the grating, thereby indicating the presence of the pathogen. In another embodiment, the sensor has a Mach-Zehnder interferometer (MZI), one arm of which has a resonator formed by two Bragg gratings. The surface of the resonator between the gratings has a functional layer whereas the Bragg gratings themselves do not have such a layer.Type: GrantFiled: December 22, 2003Date of Patent: May 1, 2007Assignee: Lucent Technologies Inc.Inventors: Dustin W. Carr, Ho Bun Chan, Alex T. Tran
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Patent number: 7155083Abstract: A monolithic waveguide/MEMS switch is disclosed that has a waveguide portion and a MEMS mirror portion fabricated on a single substrate, such as a as a silicon-on-insulator wafer. The monolithic waveguide/MEMS switch adjusts the phase of an optical signal by varying the position of one or more moveable mirrors. The mirror portion includes a mirror having a reflective surface that is attached to at least one MEMS actuator to achieve in-plane motion of the mirror (moves parallel to a plane of said at least one waveguide). In one implementation, the MEMS actuator is embodied as a known comb drive actuator. The phase adjustment techniques of the present invention may be employed in various optical devices, including wavelength selective optical switches that support multiple optical channels.Type: GrantFiled: June 29, 2006Date of Patent: December 26, 2006Assignee: Lucent Technologies Inc.Inventors: Frieder Heinrich Baumann, Ho Bun Chan, Dan T. Fuchs, Howard Roy Stuart
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Patent number: 7149378Abstract: A monolithic waveguide/MEMS switch is disclosed that has a waveguide portion and a MEMS mirror portion fabricated on a single substrate, such as a as a silicon-on-insulator wafer. The monolithic waveguide/MEMS switch adjusts the phase of an optical signal by varying the position of one or more moveable mirrors. The mirror portion includes a mirror having a reflective surface that is attached to at least one MEMS actuator to achieve in-plane motion of the mirror (moves parallel to a plane of said at least one waveguide). In one implementation, the MEMS actuator is embodied as a known comb drive actuator. The phase adjustment techniques of the present invention may be employed in various optical devices, including wavelength selective optical switches that support multiple optical channels.Type: GrantFiled: December 24, 2003Date of Patent: December 12, 2006Assignee: Lucent Technologies Inc.Inventors: Frieder Heinrich Baumann, Ho Bun Chan, Dan T. Fuchs, Howard Roy Stuart
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Patent number: 7122872Abstract: Materials such as titanium are vapor-deposited in the presence of, e.g., oxygen to form a film on a substrate, such as to provide an adhesion layer between a silicon movable structure in an optical MEMS device and a gold layer serving as a reflecting surface. The resulting film contains titanium and oxygen. Varying the conditions under which the film is deposited varies the intrinsic stress of the film, which varies the change in substrate shape caused by the presence of the film. A film having a desired intrinsic stress may be obtained by control of the oxygen partial pressure when the film is deposited. In one embodiment, the oxygen partial pressure in the atmosphere present during titanium deposition is greater than about 2×10?7 Torr, and preferably between about 1×10?6 Torr and about 2×10?6 Torr.Type: GrantFiled: May 20, 2003Date of Patent: October 17, 2006Assignee: Lucent Technologies Inc.Inventors: James F. Bailey, Ho Bun Chan, Louis T. Gomez, Martin Haueis
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Patent number: 6993219Abstract: A waveguide/MEMS switch adapted to redirect optical signals between output ports based on a phase shift change generated by motion of one or more movable MEMS mirrors incorporated therein. Advantageously, such a switch has a relatively high switching speed and low power consumption. A switch according to one embodiment of the invention includes a planar waveguide device and a planar MEMS device. The MEMS device implements in-plane (i.e., parallel to the plane of that device) translation of the mirrors. As a result, in certain embodiments of the switch, the waveguide and MEMS devices are connected into a compact planar assembly.Type: GrantFiled: March 13, 2003Date of Patent: January 31, 2006Assignee: Lucent Technologies Inc.Inventors: Vladimir A. Aksyuk, Ho Bun Chan, Dan Fuchs, Dennis S. Greywall, Maria E. Simon
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Patent number: 6933004Abstract: Materials such as titanium are vapor-deposited to form a film on a substrate while the substrate is thermally coupled to a temperature-controlling thermal source. Varying the temperature conditions of the substrate when the film is deposited varies the intrinsic stress of the film, which varies the change in substrate shape caused by the presence of the film. A film having a desired intrinsic stress may be obtained by control of the substrate temperature when the film is deposited. A stress-controlled titanium film may be used, for example, as an adhesion layer between a silicon movable structure in an optical MEMS device and a gold layer serving as a reflecting surface.Type: GrantFiled: May 20, 2003Date of Patent: August 23, 2005Assignee: Lucent Technologies Inc.Inventors: Ho Bun Chan, Martin Haueis
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Publication number: 20040234736Abstract: Materials such as titanium are vapor-deposited to form a film on a substrate while the substrate is thermally coupled to a temperature-controlling thermal source. Varying the temperature conditions of the substrate when the film is deposited varies the intrinsic stress of the film, which varies the change in substrate shape caused by the presence of the film. A film having a desired intrinsic stress may be obtained by control of the substrate temperature when the film is deposited. A stress-controlled titanium film may be used, for example, as an adhesion layer between a silicon movable structure in an optical MEMS device and a gold layer serving as a reflecting surface.Type: ApplicationFiled: May 20, 2003Publication date: November 25, 2004Inventors: Ho Bun Chan, Martin Haueis
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Publication number: 20040235296Abstract: Materials such as titanium are vapor-deposited in the presence of, e.g., oxygen to form a film on a substrate, such as to provide an adhesion layer between a silicon movable structure in an optical MEMS device and a gold layer serving as a reflecting surface. The resulting film contains titanium and oxygen. Varying the conditions under which the film is deposited varies the intrinsic stress of the film, which varies the change in substrate shape caused by the presence of the film. A film having a desired intrinsic stress may be obtained by control of the oxygen partial pressure when the film is deposited. In one embodiment, the oxygen partial pressure in the atmosphere present during titanium deposition is greater than about 2×10−7 Torr, and preferably between about 1×10−6 Torr and about 2×10−6 Torr.Type: ApplicationFiled: May 20, 2003Publication date: November 25, 2004Inventors: James F. Bailey, Ho Bun Chan, Louis T. Gomez, Martin Haueis
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Publication number: 20040179773Abstract: A waveguide/MEMS switch adapted to redirect optical signals between output ports based on a phase shift change generated by motion of one or more movable MEMS mirrors incorporated therein. Advantageously, such a switch has a relatively high switching speed and low power consumption. A switch according to one embodiment of the invention includes a planar waveguide device and a planar MEMS device. The MEMS device implements in-plane (i.e., parallel to the plane of that device) translation of the mirrors. As a result, in certain embodiments of the switch, the waveguide and MEMS devices are connected into a compact planar assembly.Type: ApplicationFiled: March 13, 2003Publication date: September 16, 2004Inventors: Vladimir A. Aksyuk, Ho Bun Chan, Dan Fuchs, Dennis S. Greywall, Maria E. Simon
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Publication number: 20040156580Abstract: A monolithic waveguide/MEMS switch is disclosed that has a waveguide portion and a MEMS mirror portion fabricated on a single substrate, such as a as a silicon-on-insulator wafer. The monolithic waveguide/MEMS switch adjusts the phase of an optical signal by varying the position of one or more moveable mirrors. The mirror portion includes a mirror having a reflective surface that is attached to at least one MEMS actuator to achieve in-plane motion of the mirror (moves parallel to a plane of said at least one waveguide). In one implementation, the MEMS actuator is embodied as a known comb drive actuator. The phase adjustment techniques of the present invention may be employed in various optical devices, including wavelength selective optical switches that support multiple optical channels.Type: ApplicationFiled: December 24, 2003Publication date: August 12, 2004Inventors: Frieder Heinrich Baumann, Ho Bun Chan, Dan T. Fuchs, Howard Roy Stuart