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US 6,583,923 B1Granted
Optical fiber amplifier
AssigneeSiemens Aktiengesellschaft
InventorLutz Rapp
Life of this patent
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Abstract
The invention is directed to an optical fiber amplifier having a switchable or interchangeable fiber module for varying the effective length of an amplification fiber. An optical fiber amplifier for wavelength-division multiplex (WDM) signals comprises an interchangeable fiber module (FM) in the basic amplifier module (VM) for matching the gain to different input levels for optimum noise behavior. The change in amplification is based on the variation of the length of the amplification fibers (EDF1, EDF2).
Claims13
An optical fiber amplifier, comprising:
- a first amplifier stage, comprising a first amplification fiber and at least a first pump source;
- a last amplifier stage, comprising a second amplification fiber and at least a second pump source;
- a fiber module that is interchangeable or switchable, comprising an additional amplification fiber, the fiber module being connected in series in the last amplifier stage and between the first amplification fiber and the second amplification fiber, the fiber module being configured to vary an effective length of the last amplifier stage for optimizing the noise behavior of the optical fiber amplifier by different gain values.
Dependencies are inferred from the claim text.