Patents Assigned to Chorum Technologies
  • Acute twist nematic liquid crystal electro-optic modulator for use in an infrared optical communication system having extinction ratio of -25db
    Patent number: 6094246
    Abstract: A twisted nematic liquid crystal-based electro-optic modulator with a twist angle between 0.degree. and 90.degree., and preferably between 50.degree. and 80.degree. is provided. The modulator provides a relatively rapid switching time such as less than about 50 milliseconds, and provides relatively large extinction ratios, such as greater than -25 dB. Preferably the liquid crystal entrance director differs from the polarization direction by a beta angle of about 15.degree..
    Type: Grant
    Filed: January 6, 1998
    Date of Patent: July 25, 2000
    Assignee: Chorum Technologies
    Inventors: Charles Wong, Yen-Chen Chen, Kuang-Yi Wu, Jian-Yu Liu