Patents Assigned to Renka Corporation
  • Fast 1×N fiber-optic switch
    Patent number: 6697550
    Abstract: An optical switch for switching an incoming light signal to one of a number of output ports in a polarization independent manner. The optical switch includes a walk-off device, and a compensator which compensates for walk-off distance variations of two polarized beams, with orthogonal polarization directions, associated with the walk-off device.
    Type: Grant
    Filed: October 24, 2001
    Date of Patent: February 24, 2004
    Assignee: Renka Corporation
    Inventor: Qiushui Chen
  • Small residual dispersion fiber connected with a dispersion compensating fiber
    Patent number: 6650812
    Abstract: An optical fiber link having a small residual dispersion fiber (SRDF) connected to a dispersion compensating fiber (DCF). The SRDF has a positive dispersion slope, and the DCF has a negative dispersion slope. The dispersion slope of the DCF is matched to the dispersion slope of the SRDF so that the DCF compensates the accumulated dispersion in the SRDF in the wavelength range between about 1530 nm to 1565 nm which represents the C-band of erbium doped fiber amplifiers (EDFA).
    Type: Grant
    Filed: April 27, 2001
    Date of Patent: November 18, 2003
    Assignee: Renka Corporation
    Inventors: Ishwar Chandra Goyal, Ravendra Kumar Varshney, Bishnu Pal, Ajoy Ghatak
  • Fast 1xN fiber-optic switch
    Publication number: 20030103718
    Abstract: An optical switch for switching an incoming light signal to one of a number of output ports in a polarization independent manner. The optical switch includes a walk-off device, and a compensator which compensates for walk-off distance variations of two polarized beams, with orthogonal polarization directions, associated with the walk-off device.
    Type: Application
    Filed: October 24, 2001
    Publication date: June 5, 2003
    Applicant: Renka Corporation
    Inventor: Qiushui Chen
  • Fiber coupler and compensation system
    Publication number: 20030095749
    Abstract: A coupler which couples a light signal from an input port to two more output ports. The coupler includes a multifaceted prism which separates an incoming light signal into selective portions and deflects these portions in different directions to the respective output ports. A lens is positioned between the output ports and the prism to focus the light signal from the prism to the output ports.
    Type: Application
    Filed: November 21, 2001
    Publication date: May 22, 2003
    Applicant: Renka Corporation
    Inventor: Qiushui Chen
  • Small residual dispersion fiber connected with a dispersion compensating fiber
    Publication number: 20030007760
    Abstract: An optical fiber link having a small residual dispersion fiber (SRDF) connected to a dispersion compensating fiber (DCF). The SRDF has a positive dispersion slope, and the DCF has a negative dispersion slope. The dispersion slope of the DCF is matched to the dispersion slope of the SRDF so that the DCF compensates the accumulated dispersion in the SRDF in the wavelength range between about 1530 nm to 1565 nm which represents the C-band of erbium doped fiber amplifiers (EDFA).
    Type: Application
    Filed: April 27, 2001
    Publication date: January 9, 2003
    Applicant: Renka Corporation
    Inventors: I. C. Goyal, R. K. Varshney, Bishnu Pal, Ajoy Ghatak