Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-12-26
2000-10-17
Mullen, Thomas
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, 359173, 359174, 359187, H04J 1402
Patent
active
061340340
ABSTRACT:
An apparatus and method for controlling power levels of individual signal lights of a wavelength division multiplexed (WEM) signal light. The apparatus includes an optical fiber, a coupler and a controller. The WDM signal light travels through the optical fiber. The WDM signal light includes a plurality of individual signal lights which each have a corresponding power level. The coupler decouples a portion of the WDM signal light from the optical fiber. The controller determines the spectrum of the WDM signal light from the decoupled portion and controls the power levels of the plurality of individual signal lights in accordance with the determined spectrum. More specifically, the controller can control the relative power levels of the plurality of individual signal lights with respect to each other. In addition, the controller can control the power levels of the plurality of individual signal lights to perform preemphasis on the WDM signal light. The controller can control the power levels of the plurality of individual signal lights to obtain substantially equal signal to noise ratios of the plurality of individual signal lights as received by a receiver through the optical fiber. The method includes the steps of (a) decoupling a portion of a WDM signal light travelling through an optical fiber (b) determining the spectrum of the WDM signal light from the decoupled portion, and (c) controlling the power levels of individual signal lights of the WDM signal light in accordance with the determined spectrum.
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A.R. Chraplyvy, et al., EQUALIZATION IN AMPLIFIED WDM LIGHTWAVE TRANSMISSION SYSTEMS; IEEE Photonics Technology Letters, vol. 4, No. 8, Aug. 1992; pp. 920-922.
Fujitsu Limited
Mullen Thomas
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