Transient and switching event stabilization of fiber optic transport systems

摘要

A method and system for transient and switching stabilization of a fiber optic transport system. One or more data-bearing channels are coupled to an optical fiber. The data-bearing channels are distributed among a plurality of frequency sub-bands. A set of control channels is also coupled to the optical fiber. Each control channel includes a pair of signals at separate frequencies. There is at least one control channel in each of the plurality of frequency sub-bands. The pair of signals of a control channel are cross-polarized. Optical power in at least one of the plurality of sub-bands is measured. Responsive to the measured optical power, the optical power of a control channel is adjusted to maintain a substantially constant power of a sub-band that contains the adjusted control channel.

主权项

1. A method for power control of signals carried by an optical fiber in a transmission frequency band having a plurality of frequency sub-bands defining contiguous bands of frequencies within the transmission frequency band, the method comprising:
generating a plurality of data-bearing channels for each of the plurality of frequency sub-bands; generating, by a amplitude spontaneous emission (ASE) device, a plurality of dummy channels for each of the plurality of frequency sub-bands; coupling, by a wavelength selective switch (WSS), the plurality of data-bearing channels and the plurality of dummy channels to the optical fiber; measuring a pre-transmission power of each of the plurality of frequency sub-bands after coupling the plurality of data-bearing channels and the plurality of dummy channels; determining if the measured pre-transmission power for each of the plurality of frequency sub-bands is at a target pre-transmission power level; for each of the plurality of frequency sub-bands determined to be above or below the target pre-transmission power level, modifying a number of the generated dummy channels or a power level of the generated dummy channels; generating a control channel for each of the plurality of frequency sub-bands, each control channel comprising a pair of signals at separate frequencies and cross polarized with respect to the other signal; coupling the control channels to the optical fiber after the WSS; measuring a transmission power of each of the plurality of frequency sub-bands after coupling the control channels; determining if the measured transmission power for each of the plurality of frequency sub-bands is at a target transmission power level; and for each of the plurality of frequency sub-bands determined to be above or below the target transmission power level, adjusting a power level of at least one of the pair of signals.