Method and apparatus for adjusting for polarization-induced, optical signal transients
First Claim
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1. A method for adjusting an optical signal transmitted through an optical network comprising:
- determining an estimated gain difference between a first reference signal and a second reference signal transmitted through an optical network;
measuring a gain difference between the first reference signal and the second reference signal;
determining a polarization-related degradation of the optical network based at least in part on a difference between the estimated gain difference and the measured gain difference; and
adjusting the optical signal transmitted through the optical network based at least in part on the degradation.
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Abstract
The invention includes methods and apparatuses to adjust an optical signal transmitted through an optical amplifier, such as in a wavelength division multiplexed optical network. The methods and apparatus of the invention calculate polarization effects which cause degradation to the optical signal. A measurement of the polarization-related degradation of an optical signal is calculated by using at least one reference signal. In some embodiments of the invention, the reference signal is depolarized or has scrambled polarizations. The invention is typically used in long-haul optical networks.
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27 Claims
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1. A method for adjusting an optical signal transmitted through an optical network comprising:
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determining an estimated gain difference between a first reference signal and a second reference signal transmitted through an optical network; measuring a gain difference between the first reference signal and the second reference signal; determining a polarization-related degradation of the optical network based at least in part on a difference between the estimated gain difference and the measured gain difference; and adjusting the optical signal transmitted through the optical network based at least in part on the degradation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for adjusting an optical signal transmitted through an optical network comprising:
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a control circuit for; determining an estimated gain difference between a first reference signal and a second reference signal transmitted through an optical network; measuring a gain difference between the first reference signal and the second reference signal; and determining a degradation of the optical network based at least in part on a difference between the estimated gain difference and the measured gain difference, the degradation comprising at least polarization-related degradation; and a controller for adjusting at least one optical signal transmitted through the optical network based at least in part on the degradation. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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Specification