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US 7,925,128 B2Granted
Pumping in a higher-order mode that is different from a signal mode
AssigneeOFS Fitel, LLC
InventorSiddharth Ramachandran
Life of this patent
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Abstract
The present disclosure provides an approach to more efficiently amplify signals by matching either the gain materials or the pump profile with the signal profile for a higher-order mode (HOM) signal. By doing so, more efficient energy extraction is achieved.
Claims15
An apparatus comprising:
- a signal source;
- a gain-doped optical fiber for propagating a higher-order mode (HOM) signal, the gain-doped optical fiber being optically coupled to the signal source;
- a pump source, the pump source being optically coupled to the gain-doped optical fiber;
- a first set of long-period gratings (LPG) written on the gain-doped optical fiber, the first set of LPG being configured to convert a signal to a first HOM;
- and
- a second set of LPG written on the gain-doped optical fiber, the second set of LPG being configured to convert pump light to a second HOM, the second HOM being different from the first HOM.
3 more elements
An apparatus comprising:
- an optical fiber having a gain-doped region, the optical fiber further having an outer cladding that is located radially-exterior to the gain-doped region, the gain-doped region for propagating a higher-order mode (HOM) signal;
- a signal mode converter optically coupled to the optical fiber, the signal mode converter for converting a signal to a first higher-order mode (HOM);
- and
- a pump mode converter optically coupled to the optical fiber, the pump mode converter for converting pump light to a second HOM.
1 more element
In a gain-doped optical fiber, a method comprising:
- converting a signal to a first higher-order mode (HOM);
- and
- converting a pump to a second HOM.
Dependencies are inferred from the claim text.