Chromatic dispersion management
AssigneeFacebook, Inc.
InventorIlya Lyubomirsky
Life of this patent
Estimating the term…
Abstract
Optical fiber data communications are described. A controller can determine chromatic dispersion of an optical signal that is to be demodulated using coherent detection. The controller can then determine the chromatic dispersion of another optical signal that is to be demodulated using direct detection. The chromatic dispersion of the other optical signal can then be adjusted to account for chromatic dispersion experienced by the other optical signal when it propagated through an optical fiber.
Claims20
An optical fiber data communications system, comprising:
- a chromatic dispersion determining circuit configured to determine chromatic dispersion of a first optical signal to be demodulated using direct detection, the determination of the chromatic dispersion of the first optical signal based on information indicative of chromatic dispersion of a second optical signal to be demodulated using coherent detection, wherein the chromatic dispersion determining circuit is configured to determine phase information of the second optical signal and further configured to determine the information indicative of chromatic dispersion of the second optical signal based on the determined phase information;
- and
- a chromatic dispersion reversing module configured to apply a chromatic dispersion adjustment to adjust the chromatic dispersion of the first optical signal based on the determination of the chromatic dispersion of the first optical signal, wherein the chromatic dispersion reversing module is further configured to determine the chromatic dispersion adjustment that reverses at least a portion of the chromatic dispersion of the first optical signal.
An optical fiber data communications system managing chromatic dispersion configured to determine characteristics of a first optical signal corresponding with coherent detection, and configured to reverse at least a portion of dispersion of a second optical signal corresponding with direct detection based on the characteristics of the first optical signal corresponding with coherent detection.
A method, comprising:
- determining characteristics of a first optical signal corresponding to coherent detection;
- determining chromatic dispersion of a second optical signal corresponding to direct detection based on the characteristics of the first optical signal;
- and
- reversing at least a portion of the chromatic dispersion of the second optical signal based on the determination of the chromatic dispersion of the second optical signal.
Dependencies are inferred from the claim text.