Patents by Inventor Yatao Yang
Yatao Yang 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: 8664584Abstract: A compact PD unidirectivity solution for an optical tap monitor, which reduces the overall size of optical tap module, is provided. The solution is to use lensing to separate the light from the input and output fibers, and then add a mask or spacer in front of the monitor PD to prevent any of the light from the output fiber from entering the photodetector package.Type: GrantFiled: October 15, 2010Date of Patent: March 4, 2014Assignee: JDS Uniphase CorporationInventors: Yatao Yang, Chang Xiao, Yujian Bao, Fenhong Zhou
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Publication number: 20110089314Abstract: A compact PD unidirectivity solution for an optical tap monitor, which reduces the overall size of optical tap module, is provided. The solution is to use lensing to separate the light from the input and output fibres, and then add a mask or spacer in front of the monitor PD to prevent any of the light from the output fiber from entering the photodetector package.Type: ApplicationFiled: October 15, 2010Publication date: April 21, 2011Applicants: JDS Uniphase CorporationInventors: Yatao YANG, Chang Xiao, Yujian Bao, Fenhong Zhou
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Publication number: 20090103867Abstract: A compact variable optical attenuator having optical-tap functionality is described comprising a planar waveguide attenuator, a lens, and a photodetector. Input and output waveguides are located close to the optical axis of the lens, which reduces optical aberrations and insertion loss. The waveguide attenuator works by light absorption with virtually no scattered light present, which improves fidelity of measurements of the tapped optical power by the photodetector. The entire tap-attenuator assembly is packaged into a small form pluggable (SFP) package having two optical connectors.Type: ApplicationFiled: October 6, 2008Publication date: April 23, 2009Applicant: JDS Uniphase CorporationInventors: Qing Huang, Chang Xiao, Xiaolin Chen, Yatao Yang
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Patent number: 7477827Abstract: A variable optical attenuator is disclosed, which attenuates a beam of light while preserving its polarization substantially independent of wavelength. The beam of light is attenuated by a filter patterned with a grating of blocking stripes with serrated edges, which partially block and partially transmit the beam of light, respectively. The serrated edges provide for low polarization dependent loss. Along a length of the filter, a mark to space ratio of blocking stripe and aperture widths increases. By a linear translation of the filter along its length attenuation can be varied to a desired value. A stepper motor with lead screw can provide a suitable linear translation to give the filter a latching property.Type: GrantFiled: January 30, 2008Date of Patent: January 13, 2009Assignee: JDS Uniphase CorporationInventors: Miaoqing Wang, Yatao Yang, Ting Xue, Yunhui Sun
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Patent number: 7433557Abstract: The tunable add/drop multiplexer including a tiltable mirror, a fixed thin film filter, and first and second retro-reflector elements for redirecting express channels back out an input/output port and for redirecting drop channels back out an add/drop port, respectively.Type: GrantFiled: January 11, 2008Date of Patent: October 7, 2008Assignee: JDS Uniphase CorporationInventors: Bo Chen, Bo Cai, Yatao Yang, Ming Liang, Xiaobiao Wang
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Publication number: 20080205845Abstract: A variable optical attenuator is disclosed, which attenuates a beam of light while preserving its polarization substantially independent of wavelength. The beam of light is attenuated by a filter patterned with a grating of blocking stripes with serrated edges, which partially block and partially transmit the beam of light, respectively. The serrated edges provide for low polarization dependent loss. Along a length of the filter, a mark to space ratio of blocking stripe and aperture widths increases. By a linear translation of the filter along its length attenuation can be varied to a desired value. A stepper motor with lead screw can provide a suitable linear translation to give the filter a latching property.Type: ApplicationFiled: January 30, 2008Publication date: August 28, 2008Applicant: JDS Uniphase CorporationInventors: Miaoqing Wang, Yatao Yang, Ting Xue, Yunhui Sun
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Publication number: 20080106814Abstract: The tunable add/drop multiplexer including a tiltable mirror, a fixed thin film filter, and first and second retro-reflector elements for redirecting express channels back out an input/output port and for redirecting drop channels back out an add/drop port, respectively.Type: ApplicationFiled: January 11, 2008Publication date: May 8, 2008Inventors: Bo Chen, Bo Cai, Yatao Yang, Ming Liang, Xiaobiao Wang
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Patent number: 7352928Abstract: The tunable add/drop multiplexer including a tiltable mirror, a fixed thin film filter, and first and second retro-reflector elements for redirecting express channels back out an input/output port and for redirecting drop channels back out an add/drop port, respectively.Type: GrantFiled: March 30, 2007Date of Patent: April 1, 2008Assignee: JDS Uniphase CorporationInventors: Bo Chen, Bo Cai, Yatao Yang, Ming Liang, Xiaobiao Wang
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Patent number: 7295748Abstract: The invention relates to compensating for the wavelength dependent loss (WDL) in a variable optical attenuator (VOA) system by using a chromatic dispersion wedge, which is inserted between the mirror and the lens. Different wavelength components, e.g. shorter blue and longer red wavelengths, are redirected at different angles by the chromatic dispersion wedge and now arrive at the output fiber at different positions. Thus the smaller mode field diameter (MFD) or mode spot size of the blue light, overlaps more of the core of the output fiber by being closer thereto and now has less insertion loss (IL) as compared to a VOA without WDL compensator.Type: GrantFiled: August 4, 2006Date of Patent: November 13, 2007Assignee: JDS Uniphase CorporationInventors: Bo Chen, Xishe Liu, Yatao Yang, Bo Cai
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Publication number: 20070230867Abstract: The tunable add/drop multiplexer including a tiltable mirror, a fixed thin film filter, and first and second retro-reflector elements for redirecting express channels back out an input/output port and for redirecting drop channels back out an add/drop port, respectively.Type: ApplicationFiled: March 30, 2007Publication date: October 4, 2007Applicant: JDS Uniphase CorporationInventors: Bo Chen, Bo Cai, Yatao Yang, Ming Liang, Xiaobiao Wang
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Publication number: 20070031104Abstract: The invention relates to compensating for the wavelength dependent loss (WDL) in a variable optical attenuator (VOA) system by using a chromatic dispersion wedge, which is inserted between the mirror and the lens. Different wavelength components, e.g. shorter blue and longer red wavelengths, are redirected at different angles by the chromatic dispersion wedge and now arrive at the output fiber at different positions. Thus the smaller mode field diameter (MFD) or mode spot size of the blue light, overlaps more of the core of the output fiber by being closer thereto and now has less insertion loss (IL) as compared to a VOA without WDL compensator.Type: ApplicationFiled: August 4, 2006Publication date: February 8, 2007Applicant: JDS Uniphase CorporationInventors: Bo Chen, Xishe Liu, Yatao Yang, Bo Cai