This patent application is assigned to
The following quote was obtained by the news editors from the background information supplied by the inventors: "Telecommunications systems, cable television systems and data communication networks use optical networks to rapidly convey large amounts of information between remote points. In an optical network, information is conveyed in the form of optical signals through optical fibers. Optical networks may also include various network elements such as amplifiers, dispersion compensators, multiplexer/demultiplexer filters, wavelength selective switches, couplers, etc. configured to perform various operations within the network.
"However, each of these network elements may also introduce polarization dependent effects on the signals traveling through the network. These effects may cause the various components of the polarization states of the signals to experience varying degrees of loss or gain, thus causing unequal power levels of the various polarization components of the signals. This inequality of power may cause information or data carried by the signals to become distorted or lost."
In addition to the background information obtained for this patent application, VerticalNews journalists also obtained the inventors' summary information for this patent application: "In accordance with one embodiment, a method for adjusting an optical signal includes determining a polarization dependent loss (PDL) value associated with the optical signal, determining an angle between the optical signal and one or more axes of PDL, determining an amount of nonlinear phase noise due to PDL and nonlinear effects upon the optical signal based upon the PDL value and the angle, determining a phase rotation based upon the amount of nonlinear phase noise, and applying the phase rotation to the optical signal.
"In accordance with another embodiment, a system for adjusting an optical signal includes an optical network configured to transmit the optical signal and a compensator. The compensator is configured to determine a PDL value associated with the optical signal, determine an angle between the optical signal and one or more axes of PDL, determine an amount of nonlinear phase noise due to PDL and nonlinear effects upon the optical signal experienced during transmission by the optical network, determine a phase rotation based upon the amount of nonlinear phase noise, and apply the phase rotation to the optical signal. The amount is based upon the PDL value and the angle.
"In accordance with yet another embodiment, a compensator includes a processor coupled to a memory, and instructions resident on the memory. The instructions are readable by the processor. The instructions, when read, are configured to cause the processor to determine a PDL value associated with an optical signal transmitted through an optical network, determine an angle between the optical signal and one or more axes of PDL, determine an amount of nonlinear phase noise due to PDL and nonlinear effects upon the optical signal experienced during transmission by the optical network, determine a phase rotation based upon the amount of nonlinear phase noise, and apply the phase rotation to the optical signal. The amount is based upon the PDL value and the angle.
"The object and advantages of the invention will be realized and attained at least by the features, elements, and combinations particularly pointed out in the claims. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, as claimed.
BRIEF DESCRIPTION OF THE DRAWINGS
"For a more complete understanding of the present disclosure and its features and advantages, reference is now made to the following description, taken in conjunction with the accompanying drawings, in which:
"FIG. 1 illustrates an example embodiment of an optical network;
"FIG. 2a illustrates the effects of polarization dependent loss (PDL) on signals with modulated polarization components substantially aligned with the high and low loss axes of PDL;
"FIG. 2b illustrates the effects of PDL on signals with modulated polarization components oriented approximately forty-five degrees with respect to the high and low axes of the PDL;
"FIG. 3 illustrates an example compensation system for compensating an optical signal for degradation due to combined nonlinear and polarization dependent loss effects in dual polarization optical systems.
"FIG. 4 is a more detailed illustration of an example embodiment of a nonlinear compensator; and
"FIG. 5 illustrates an example method for compensating for signal degradation due to polarization dependent loss and nonlinear effects upon phase shift."
URL and more information on this patent application, see: Vassilieva, Olga; Kim, Inwoong; Sekiya, Motoyoshi. System and Method for Compensating Signal Degradation in Dual Polarization Optical Systems. Filed
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