Patents by Inventor Shifu Yuan
Shifu Yuan 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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Publication number: 20230366446Abstract: A passive motion isolation system for motion-sensitive equipment is disclosed. The passive motion isolation system has a three-axis free motion platform mounted on a base subject to ambient motions. A vibration isolation subsystem is coupled between the motion-sensitive equipment and the three-axis free motion platform.Type: ApplicationFiled: July 28, 2023Publication date: November 16, 2023Applicant: CALIENT TECHNOLOGIES, INC.Inventors: Shifu YUAN, Norm GARDNER, Ernest M. LEOS, Augie RAMIREZ, Nan LUO, Sajanish BALAGOPAL, Mike HOPKINS
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Patent number: 11815153Abstract: A passive motion isolation system for motion-sensitive equipment is disclosed. The passive motion isolation system has a three-axis free motion platform mounted on a base subject to ambient motions. A vibration isolation subsystem is coupled between the motion-sensitive equipment and the three-axis free motion platform.Type: GrantFiled: February 27, 2020Date of Patent: November 14, 2023Assignee: Calient Technologies, Inc.Inventors: Shifu Yuan, Norm Gardner, Ernest M. Leos, Augie Ramirez, Nan Luo, Sajanish Balagopal, Mike Hopkins
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Publication number: 20200284316Abstract: A passive motion isolation system for motion-sensitive equipment is disclosed. The passive motion isolation system has a three-axis free motion platform mounted on a base subject to ambient motions. A vibration isolation subsystem is coupled between the motion-sensitive equipment and the three-axis free motion platform.Type: ApplicationFiled: February 27, 2020Publication date: September 10, 2020Applicant: Calient Technologies, Inc.Inventors: Shifu YUAN, Norm GARDNER, Ernest M. LEOS, Augie RAMIREZ, Nan LUO, Sajanish BALAGOPAL, Mike HOPKINS
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Patent number: 9366824Abstract: Optical circuit switches and switching methods are described. An optical circulator may form a first plurality of bidirectional optical beams from a first plurality of input optical beams and a corresponding first plurality of output optical beams. Each bidirectional optical beam may consist of the corresponding input optical beam and the corresponding output optical beam overlaid to follow, in opposing directions, a common optical path. A mirror array may be disposed to reflect the first plurality of bidirectional optical beams. A reflector may be disposed to intercept bidirectional optical beams reflected from the mirror array and to reflect at least some of the intercepted bidirectional optical beams back to the mirror array.Type: GrantFiled: May 6, 2015Date of Patent: June 14, 2016Assignee: CALIENT Technologies, Inc.Inventors: Shifu Yuan, Nan Luo, Changbao Ma
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Publication number: 20160004014Abstract: An optical circuit switch and method. A first mirror element rotates about orthogonal axes in response to first and second voltages applied respectively to first and second electrodes. A second mirror element rotates about orthogonal axes in response to third and fourth voltages applied respectively to the third and fourth electrodes. A controller may apply first through fourth voltages respectively to the first through fourth electrodes to make a connection between first and second ports. When an initial insertion loss of the connection does not exceed a predetermined threshold, the controller may conduct independent single-dimension searches to determine values for the first through fourth voltages that minimize the insertion loss. When the initial insertion loss exceeds the predetermined threshold, the controller may conduct a four-dimensional search to determine values for the first through fourth voltages that reduce the insertion loss to not exceed the predetermined threshold.Type: ApplicationFiled: July 2, 2014Publication date: January 7, 2016Inventors: Jitender Miglani, Mchael Deacon, Vijayan Thattai, Sushma Sagaram, Shifu Yuan
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Patent number: 9213143Abstract: An optical circuit switch and method. A first mirror element rotates about orthogonal axes in response to first and second voltages applied respectively to first and second electrodes. A second mirror element rotates about orthogonal axes in response to third and fourth voltages applied respectively to the third and fourth electrodes. A controller may apply first through fourth voltages respectively to the first through fourth electrodes to make a connection between first and second ports. When an initial insertion loss of the connection does not exceed a predetermined threshold, the controller may conduct independent single-dimension searches to determine values for the first through fourth voltages that minimize the insertion loss. When the initial insertion loss exceeds the predetermined threshold, the controller may conduct a four-dimensional search to determine values for the first through fourth voltages that reduce the insertion loss to not exceed the predetermined threshold.Type: GrantFiled: July 2, 2014Date of Patent: December 15, 2015Assignee: CALIENT Technologies, Inc.Inventors: Jitender Miglani, Mchael Deacon, Vijayan Thattai, Sushma Sagaram, Shifu Yuan
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Publication number: 20150355411Abstract: Optical circuit switches and switching methods are described. An optical circulator may form a first plurality of bidirectional optical beams from a first plurality of input optical beams and a corresponding first plurality of output optical beams. Each bidirectional optical beam may consist of the corresponding input optical beam and the corresponding output optical beam overlaid to follow, in opposing directions, a common optical path. A mirror array may be disposed to reflect the first plurality of bidirectional optical beams. A reflector may be disposed to intercept bidirectional optical beams reflected from the mirror array and to reflect at least some of the intercepted bidirectional optical beams back to the mirror array.Type: ApplicationFiled: May 6, 2015Publication date: December 10, 2015Inventors: Shifu Yuan, Nan Luo, Changbao Ma
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Patent number: 9063288Abstract: Optical circuit switches and switching methods are described. A first optical circulator may form a first plurality of bidirectional optical beams from a first plurality of input optical beams and a corresponding first plurality of output optical beams. Each bidirectional optical beam may consist of the corresponding input optical beam and the corresponding output optical beam overlaid to follow, in opposing directions, a common optical path. A first mirror array may be disposed to reflect the first plurality of bidirectional optical beams.Type: GrantFiled: May 29, 2013Date of Patent: June 23, 2015Assignee: Calient Technologies, Inc.Inventors: Shifu Yuan, Nan Luo, Changbao Ma
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Publication number: 20140355933Abstract: Optical circuit switches and switching methods are described. A first optical circulator may form a first plurality of bidirectional optical beams from a first plurality of input optical beams and a corresponding first plurality of output optical beams. Each bidirectional optical beam may consist of the corresponding input optical beam and the corresponding output optical beam overlaid to follow, in opposing directions, a common optical path. A first mirror array may be disposed to reflect the first plurality of bidirectional optical beams.Type: ApplicationFiled: May 29, 2013Publication date: December 4, 2014Inventors: Shifu Yuan, Nan Luo, Changbao Ma
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Publication number: 20140355984Abstract: A colorless, reconfigurable, optical add-drop multiplexer (a colorless ROADM) is disclosed. The ROADM may include a de-interleaver, a diffraction grating, and a lens. The de-interleaver may separate an input signal into a first output signal, comprising odd channels, and a second output signal, comprising even channels. The diffraction grating may receive the first and second output signals from the de-interleaver. The diffraction grating may separate each of the first and second output signals into individual channels. The lens may collimate the individual channels received from the diffraction grating.Type: ApplicationFiled: May 29, 2013Publication date: December 4, 2014Inventor: Shifu Yuan
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Patent number: 8822906Abstract: An optical device and method providing multi-channel bulk optical power monitoring is disclosed. The device and method may include a scanning mirror, a plurality of input optical fibers, a plurality of output optical fibers, and at least one sample optical fiber optically connected to a photodetector. The device and method may further include a first reflective surface and a second reflective surface. The first reflective surface may reflect light from the input optical fibers to the second reflective surface. The second reflective surface may reflect a first portion of the light into the output optical fibers and pass a second portion of the light to the scanning mirror. The scanning mirror may reflect samples of the second portion of the light into the at least one sample optical fiber.Type: GrantFiled: November 14, 2011Date of Patent: September 2, 2014Assignee: Calient Technologies, Inc.Inventors: Shifu Yuan, Roger Jonathan Helkey, Nitin Kataria
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Publication number: 20130119243Abstract: An optical device and method providing multi-channel bulk optical power monitoring is disclosed. The device and method may include a scanning mirror, a plurality of input optical fibers, a plurality of output optical fibers, and at least one sample optical fiber optically connected to a photodetector. The device and method may further include a first reflective surface and a second reflective surface. The first reflective surface may reflect light from the input optical fibers to the second reflective surface. The second reflective surface may reflect a first portion of the light into the output optical fibers and pass a second portion of the light to the scanning mirror. The scanning mirror may reflect samples of the second portion of the light into the at least one sample optical fiber.Type: ApplicationFiled: November 14, 2011Publication date: May 16, 2013Applicant: Calient Networks, Inc.Inventors: Shifu Yuan, Roger Jonathan Helkey, Nitin Kataria
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Patent number: 7676125Abstract: An apparatus is described to provide multi-channel bulk optical power detection. The apparatus has a plurality of optical splitters coupled to respective fiber-optic lines of a plurality of fiber-optic lines. An optimal time-division multiplexer has an input coupled to the plurality of optical splitters. A photodetector is coupled to an output of the optical time-division multiplexer to provide bulk optical power detection. The optical time-division multiplexer includes a scanning mirror.Type: GrantFiled: June 18, 2007Date of Patent: March 9, 2010Assignee: Calient Networks, Inc.Inventors: Xuezhe Zheng, Shifu Yuan, Roger Helkey, Marduke Yousepfor, Charles Matthew Corbalis, Chandrasekhar Pusarla
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Patent number: 7529441Abstract: An optical switch for routing arbitrary wavelengths between optical fibers in optical networks. The optical switch may include a highly wavelength dispersive element together with a spatially dispersive element to separate the wavelengths. Broadband switch inputs and outputs may be provided for adding and dropping arbitrary wavelengths at each node of the network. Fiber demultiplexers and multiplexers may also be used to reduce the impact of mirror array yield on switch functionality.Type: GrantFiled: July 2, 2007Date of Patent: May 5, 2009Assignee: Calient Networks, Inc.Inventors: Roger Jonathan Helkey, Shifu Yuan, Xuezhe Zheng
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Publication number: 20080002932Abstract: An apparatus is described to provide multi-channel bulk optical power detection. The apparatus has a plurality of optical splitters coupled to respective fiber-optic lines of a plurality of fiber-optic lines. An optimal time-division multiplexer has an input coupled to the plurality of optical splitters. A photodetector is coupled to an output of the optical time-division multiplexer to provide bulk optical power detection. The optical time-division multiplexer includes a scanning mirror.Type: ApplicationFiled: June 18, 2007Publication date: January 3, 2008Inventors: Xuezhe Zheng, Shifu Yuan, Roger Helkey, Marduke Yousepfor, Charles Corbalis, Chandrasekhar Pusarla
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Publication number: 20070258679Abstract: An optical switch for routing arbitrary wavelengths between optical fibers in optical networks. The optical switch may include a highly wavelength dispersive element together with a spatially dispersive element to separate the wavelengths. Broadband switch inputs and outputs may be provided for adding and dropping arbitrary wavelengths at each node of the network. Fiber demultiplexers and multiplexers may also be used to reduce the impact of mirror array yield on switch functionality.Type: ApplicationFiled: July 2, 2007Publication date: November 8, 2007Inventors: Roger Helkey, Shifu Yuan, Xuezhe Zheng
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Patent number: 7254293Abstract: An optical switch for routing arbitrary wavelengths between optical fibers in optical networks. The optical switch may include a highly wavelength dispersive element together with a spatially dispersive element to separate the wavelengths. Broadband switch inputs and outputs may be provided for adding and dropping arbitrary wavelengths at each node of the network. Fiber demultiplexers and multiplexers may also be used to reduce the impact of mirror array yield on switch functionality.Type: GrantFiled: June 28, 2004Date of Patent: August 7, 2007Assignee: Calient Networks, Inc.Inventors: Roger Jonathan Helkey, Shifu Yuan, Xuezhe Zheng
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Patent number: 7127137Abstract: An apparatus and method of controlling optical loss in an optical switch to equalize optical power or loss in a group of optical signals in an optical transmission system relatively insensitive to mechanical vibration. In one embodiment a group of optical signals is input into an optical switch and selected optical signals are variably attenuated using synchronized control to two mirrors in order to provide more uniform power distribution among the group of optical signals without enhancing vibration sensitivity of the optical switch.Type: GrantFiled: May 24, 2005Date of Patent: October 24, 2006Assignee: Calient Networks, Inc.Inventors: John Edward Bowers, Shifu Yuan, Roger Helkey, Xuezhe Zheng, James R. Sechrist
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Publication number: 20050254747Abstract: An apparatus and method of controlling optical loss in an optical switch to equalize optical power or loss in a group of optical signals in an optical transmission system relatively insensitive to mechanical vibration. In one embodiment a group of optical signals is input into an optical switch and selected optical signals are variably attenuated using synchronized control to two mirrors in order to provide more uniform power distribution among the group of optical signals without enhancing vibration sensitivity of the optical switch.Type: ApplicationFiled: May 24, 2005Publication date: November 17, 2005Applicant: Calient Networks, Inc.Inventors: John Bowers, Shifu Yuan, Roger Helkey, Xuezhe Zheng, James Sechrist
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Patent number: D982992Type: GrantFiled: July 15, 2022Date of Patent: April 11, 2023Inventor: Shifu Yuan