Resources Contact Us Home
Arrangement for mitigating first order and second-order polarization mode dispersion in optical fiber communication systems

Image Number 3 for United States Patent #6658215.

A compensation arrangement for addressing the problem of first-order and second-order polarization mode dispersion (PMD) in an optical fiber communication system includes separate, independent elements for each type of PMD. First-order PMD may be compensated using conventional techniques related to adjusting the transit time differential between the polarization states. The second-order polarization mode dispersion is compensated by recognizing the separate sources of second-order PMD (pulse broadening analogous to chromatic dispersion, additional pulse broadening due to optical filtering (narrowing), and coupling of a portion of the optical signal into the orthogonal polarization relative to the main pulse with a different transmit time. A chirped fiber grating with a variable temperature gradient, a complementary optical filter with variable spectral transmission and a polarizer, respectively, can be used to compensate for these three sources of second-order PMD.

  Recently Added Patents
Nickel-cobalt-manganese multi-element lithium ion battery cathode material with dopants and its methods of preparation
Morphinan compounds
Method and device for operating a vehicle having a hybrid drive
Arcuate motion control in electrostatic actuators
Electronic badge
Image processing apparatus and image processing method
Systems and methods for electronic verification of vehicle insurance coverage
  Randomly Featured Patents
Apparatus for inspecting a vehicle brake component and method for performing such inspection
Implement draft frame
Low-cost method and apparatus for establishing fiber optic connections
Production of synthesis gas from heavy hydrocarbon fuels containing high metal concentrations
Turbojet engine nozzle for attenuating core and turbine noise
Manual control of water delivery through ports of tub, spa or shower
Apparatus for mounting CPU heat dissipator
Multiroom air conditioner and driving method therefor
Ergonomic computer mouse
Method of transmitting information between stations attached to a unidirectional transmission ring