Patents by Inventor Andrew M. Sarangan

Andrew M. Sarangan 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).

  • Non-planar micro-optical structures
    Patent number: 6728289
    Abstract: In one embodiment, the present invention provides a microlens having very small focal length. The present invention also provides a non-planar microstructure having a covering layer which is slowly oxidizing of substantially free or oxygen. The present invention also provides methods for forming such microlenses and microstructures. In addition, the present invention provides a VCSEL which includes one or more non-planar microstructures of the present invention.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: April 27, 2004
    Assignee: Science & Technology Corporation @ University of New Mexico
    Inventors: Gregory M. Peake, Stephen D. Hersee, Andrew M. Sarangan
  • Method of making non-planar micro-optical structures
    Patent number: 6365237
    Abstract: In one embodiment, the present invention provides a microlens having very small focal length. The present invention also provides a non-planar microstructure having a covering layer which is slowly oxidizing or substantially free of oxygen. The present invention also provides methods for forming such microlenses and microstructures. In addition, the present invention provides a VCSEL which includes one or more non-planar microstructures of the present invention.
    Type: Grant
    Filed: July 24, 2000
    Date of Patent: April 2, 2002
    Assignee: University of New Mexico
    Inventors: Gregory M. Peake, Stephen D. Hersee, Andrew M. Sarangan
  • Multi-wavelength gain-coupled distributed feedback laser array with fine tunability
    Patent number: 5536085
    Abstract: A multi-wavelength laser array having a plurality of gain-coupled distributed feedback ridge waveguide lasers. The operational wavelength of each laser is established by selecting a width of the ridge waveguide in the range 1.6 .mu.m to 5.2 .mu.m. Fine tuning of each central wavelength is achieved by thermal power to selected waveguides via Titanium thin film resistors integrated into the laser array. A wavelength range of 9 nm is demonstrated utilizing a sixteen element array.
    Type: Grant
    Filed: March 30, 1995
    Date of Patent: July 16, 1996
    Assignee: Northern Telecom Limited
    Inventors: Guo P. Li, Toshihiko Makino, Andrew M. Sarangan, Weiping Huang