Patents by Inventor Yalan Mao
Yalan Mao 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: 9897779Abstract: An optical imaging lens assembly that may have three lens components. All lens components may have positive refractive power. The first object side lens component has a plano object side surface. The remaining refracting surfaces may be aspheric. The second and third lens components may have a meniscus form. All three lens components may have the same index of refraction and Abbe number.Type: GrantFiled: February 23, 2016Date of Patent: February 20, 2018Assignee: APPLE INC.Inventor: Yalan Mao
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Publication number: 20170090155Abstract: An optical imaging lens assembly that may have three lens components. All lens components may have positive refractive power. The first object side lens component has a plano object side surface. The remaining refracting surfaces may be aspheric. The second and third lens components may have a meniscus form. All three lens components may have the same index of refraction and Abbe number.Type: ApplicationFiled: February 23, 2016Publication date: March 30, 2017Inventor: Yalan Mao
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Patent number: 6850364Abstract: An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device includes an optical processing loop which allows multi-stage performance characteristics to be achieved with a single physical filtration stage. Optical processing on the first leg and second legs of the loop is asymmetrical thereby improving the integrity of the optical signals by effecting complementary chromatic dispersion on the first and second legs. In an embodiment of the invention the optical device includes a fundamental filter cell, a retro reflector and a splitter/combiner. The fundamental filter cell filters optical signals propagating on each of two legs of an optical loop which intersects the fundamental filter cell.Type: GrantFiled: June 12, 2002Date of Patent: February 1, 2005Assignee: Finisar CorporationInventors: Ping Xie, R. Brad Bettman, Haisheng Rong, Kevin Zhang, Yalan Mao, Wei Wang, Simon Yuanxiang Wu
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Patent number: 6845191Abstract: Methods for combining or splitting optical signals that include an odd channel set an even channel set. The methods of combining or splitting are performed by subjecting the odd and even channel sets to a first filter that applies phase retardations corresponding with odd integer multiples of half a wavelength for each center wavelength associated with a selected one of the odd and even set of channels and with integer multiples of a full wavelength of each center wavelength associated with a remaining one of the odd set and the even set. The channel sets are then subjected to a second filter that applies phase retardations that are complementary to those experienced by the odd and even set of channels in the first filter. This complementary filtration has the effect of reducing dispersion. These methods may be used in optical devices applicable to a range of telecommunications applications, including optical multiplexers/demultiplexers and optical routers.Type: GrantFiled: September 11, 2003Date of Patent: January 18, 2005Assignee: Finisar CorporationInventors: Ping Xie, Simon Yuanxiang Wu, Yalan Mao, Wei Wang, R. Brad Bettman, Nadim Maluf
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Patent number: 6836581Abstract: An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device splits and combines optical signals of frequency division multiplexed optical communication channels that are evenly spaced apart in frequency from one another. The optical device includes a first filter and a second filter. The first filter splits and combines odd and even channels depending on the propagation direction of the optical signal. The first filter exhibits complementary phase retardations corresponding with odd integer multiples of half a wavelength for each center wavelength associated with a selected one of the odd and even set of channels and with integer multiples of a full wavelength of each center wavelength associated with a remaining one of the odd set and the even set.Type: GrantFiled: September 11, 2003Date of Patent: December 28, 2004Assignee: Finisar CorporationInventors: Ping Xie, Simon Yuanxiang Wu, Yalan Mao, Wei Wang, R. Brad Bettman, Nadim Maluf
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Patent number: 6694066Abstract: The present invention provides optical filters that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers, optical routers, and optical gain scalers. The optical filter is modular, using two or more couplers with a pair of delay paths between each pair of couplers in a sequence to generate a range of optical filter functions. The desired filter profile/function is obtained by proper selection of the coupling ratio for each coupler and by the length of each pair of delay paths. The couplers may be implemented as polarization or intensity beam splitters positioned along the optical path. Each coupler couples in controllable amounts, one or two inputs with the corresponding pair of delay paths.Type: GrantFiled: June 11, 2001Date of Patent: February 17, 2004Assignee: Finisar CorporationInventors: Ping Xie, Simon Yuanxinag Wu, Yalan Mao, Wei Wang, R. Brad Bettman, Nadim Maluf
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Patent number: 6684002Abstract: An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device splits and combines optical signals of frequency division multiplexed optical communication channels which are evenly spaced apart in frequency from one another. The optical device includes a first filter and a second filter. The first filter splits and combines odd and even channels depending on the propagation direction of the optical signal. The first filter exhibits complementary phase retardations corresponding with odd integer multiples of half a wavelength for each center wavelength associated with a selected one of the odd and even set of channels and with integer multiples of a full wavelength for each center wavelength associated with a remaining one of the odd set and the even set.Type: GrantFiled: August 31, 2001Date of Patent: January 27, 2004Assignee: Finisar CorporationInventors: Ping Xie, Simon Yuanxiang Wu, Yalan Mao, Wei Wang, R. Brad Bettman, Nadim Maluf
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Publication number: 20030231391Abstract: An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device includes an optical processing loop which allows multi-stage performance characteristics to be achieved with a single physical filtration stage. Optical processing on the first leg and second legs of the loop is asymmetrical thereby improving the integrity of the optical signals by effecting complementary chromatic dispersion on the first and second legs. In an embodiment of the invention the optical device includes a fundamental filter cell, a retro reflector and a splitter/combiner. The fundamental filter cell filters optical signals propagating on each of two legs of an optical loop which intersects the fundamental filter cell.Type: ApplicationFiled: June 12, 2002Publication date: December 18, 2003Inventors: Ping Xie, R. Brad Bettman, Haisheng Rong, Kevin Zhang, Yalan Mao, Wei Wang, Simon Yuanxiang Wu
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Publication number: 20020154845Abstract: The present invention provides optical filters that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers, optical routers, and optical gain scalers. The optical filter is modular, using two or more couplers with a pair of delay paths between each pair of couplers in a sequence to generate a range of optical filter functions. The desired filter profile/function is obtained by proper selection of the coupling ratio for each coupler and by the length of each pair of delay paths. The couplers may be implemented as polarization or intensity beam splitters positioned along the optical path. Each coupler couples in controllable amounts, one or two inputs with the corresponding pair of delay paths.Type: ApplicationFiled: June 11, 2001Publication date: October 24, 2002Inventors: Ping Xie, Simon Yuanxinag Wu, Yalan Mao, Wei Wang, R. Brad Bettman, Nadim Maluf
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Publication number: 20020154850Abstract: An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers and optical routers. The optical device splits and combines optical signals of frequency division multiplexed optical communication channels which are evenly spaced apart in frequency from one another. The optical device includes a first filter and a second filter. The first filter splits and combines odd and even channels depending on the propagation direction of the optical signal. The first filter exhibits complementary phase retardations corresponding with odd integer multiples of half a wavelength for each center wavelength associated with a selected one of the odd and even set of channels and with integer multiples of a full wavelength for each center wavelength associated with a remaining one of the odd set and the even set.Type: ApplicationFiled: August 31, 2001Publication date: October 24, 2002Inventors: Ping Xie, Simon Yuanxiang Wu, Yalan Mao, Wei Wang, R. Brad Bettman, Nadim Maluf
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Patent number: 5900902Abstract: Apparatus and methods for exposing multilayered thermal imaging media to eliminate "cloud" or "woodgrain" artifacts by proper optimization of the exposing radiation angle of incidence. The exposure angle of incidence is large enough so that all rays with high reflectance loss are paired with equally many with low reflectance loss to increase printing efficiency.Type: GrantFiled: July 28, 1997Date of Patent: May 4, 1999Assignee: Polaroid CorporationInventors: Carl A. Chiulli, Yalan Mao, William T. Plummer
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Patent number: 5652612Abstract: Apparatus and methods for exposing multilayered thermal imaging by proper optimization of the exposing radiation angle of incidence of a coherent radiation source to eliminate "cloud" or "woodgrain" artifacts stemming from local differences in printing efficiency across a sheet of the multilayered imaging media. A media is mounted to an exposure surface and exposed with a scanning coherent Gaussian laser beam at an angle other than normal incidence. The angle of incidence of the exposing beam is intentionally made large enough so that all rays with high reflectance loss are paired with equally many with low reflectance loss to increase printing efficiency. This efficiency occurs over a range of angles between 21 and 25 degrees, with some benefit beginning at 16 degrees.Type: GrantFiled: February 12, 1996Date of Patent: July 29, 1997Assignee: Polaroid CorporationInventors: Carl A. Chiulli, Yalan Mao, William T. Plummer