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US 8,014,669 B2Granted
In-channel residual chromatic dispersion measurement
AssigneeVerizon Patent and Licensing Inc.
InventorsTiejun J. Xia, Glenn Wellbrock
Life of this patent
Estimating the term…
Abstract
A system generates optical pulses, that include two frequencies within one optical channel, at a first end of an optical link, and receives the optical pulses at a second end of the optical link. The system also sets a frequency difference for the two frequencies of the optical pulses, calculates a relative group delay difference for the two frequencies of the optical pulses, and calculates a residual chromatic dispersion of the channel based on the frequency difference and the calculated relative group delay difference.
Claims18
A method, comprising:
- generating, by a transmitter device, optical pulses, that include two frequencies within an optical channel,
- where the generating includes:
- separating, by an interferometer, light into two optical pulses that each correspond to a different one of the two frequencies;
- tuning, by a tunable filter, the optical pulses to the optical channel;
- splitting, by a beam splitter, the optical pulses into two portions,
- outputting, by the beam splitter, at least a portion of the optical pulses to the optical channel;
- receiving the optical pulses from the optical channel;
- separating the two frequencies of the optical pulses within the optical channel;
- measuring arrival times of the optical pulses;
- calculating a relative group delay difference for the two frequencies of the optical pulses, based on the arrival times;
- and
- calculating a residual chromatic dispersion of the channel based on the frequency difference and the calculated relative group delay difference.
9 more elements
A system, comprising:
- a receiver device configured to:
- receive optical pulses, that include two frequencies and a frequency difference, from a channel of an optical network,
- separate the two frequencies of the optical pulses within the channel,
- measure arrival times of the optical pulses,
- calculate a relative group delay difference for the two frequencies of the optical pulses, based on the arrival times, and
- calculate a residual chromatic dispersion of the channel based on the frequency difference and the calculated relative group delay difference;
- and
- a transmitter device configured to generate the optical pulses to the channel, where the transmitter device comprises a tunable dual-frequency light source that generates the optical pulses;
- where the tunable dual-frequency light source comprises:
- an interferometer that receives light and separates the light into the two frequencies of the optical pulses;
- a tunable filter that receives the optical pulses from the interferometer and tunes the optical pulses to the channel;
- and
- a beam splitter that splits the optical pulses into two portions, and outputs at least a portion of the optical pulses to the channel.
10 more elements
A device comprising:
- means for generating optical pulses, that include two frequencies within an optical channel,
- where the means for generating include:
- means for separating light into the two optical pulses that each correspond to a different one of the two frequencies,
- means for tuning the optical pulses to the optical channel, and
- means for splitting the optical pulses into two portions and outputting at least a portion of the optical pulses to the optical channel;
- means for receiving the optical pulses from the optical channel;
- means for separating the two frequencies of the optical pulses within the optical channel;
- means for measuring arrival times of the optical pulses;
- means for calculating a relative group delay difference for the two frequencies of the optical pulses, based on the arrival times;
- and
- means for calculating a residual chromatic dispersion of the channel based on the frequency difference and the calculated relative group delay difference.
8 more elements
Dependencies are inferred from the claim text.