Simultaneous single mode and multi-mode propagation of signals in a double clad optical fiber
AssigneeJDS Uniphase Corporation
InventorVihong Chen
Life of this patent
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Abstract
An optical amplifier having a suitable length of Er/Yb co-doped double clad optical fiber is used to amplify an input optical signal. The inner clad of the double clad optical fiber supports the propagation of a multi mode signal used to excite Er/Yb co-dopants in the double clad optical fiber. Simultaneously, a single mode signal launched from a single mode laser pump co-propagates with the input optical signal in the core of the optical fiber. In this model, single mode light travels in the single mode core region and the multi mode pump light is mainly in the clad region. The interaction between the two laser pumps is negligible.
Claims15
An optical amplifier for amplifying an input optical signal comprising;
- a wave-guide having a core doped with a rare earth and an adjacent first cladding;
- a first laser pump optically coupled to the core;
- and,
- a second laser pump optically coupled to the adjacent first cladding;
- wherein the first pump laser is a single mode laser for providing a single mode pump signal to the wave-guide core and wherein the second pump laser is a multi-mode laser for providing a multi-mode pump signal to the adjacent first cladding.
Dependencies are inferred from the claim text.