Gain Equalization for Few-Mode Erbium-Doped Fiber Amplifiers via Strong Mode Coupling
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Few-mode erbium-doped fiber amplifiers (FM-EDFAs) are one of the most important optical subsystems for successful space division multiplexed transmission systems. In this paper, we propose a new FM-EDFA designed to achieve significantly reduced differential modal gain (DMG) via strong mode coupling. Using a new numerical model based on a fiber transfer matrix, the DMGs of FM-EDFAs are systematically investigated and two different types of six-mode fiber amplifiers are analyzed, as exemplar demonstrations. In a uniformly doped step-index fiber, the DMG can be reduced from 9.3 to 1.1 dB (i.e., 8.2 dB reduction) and further reduced to 0.5 dB in a dual-layer doping structure.
2014 ◽
Vol 32
(11)
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pp. 2133-2143
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2011 ◽
Vol 53
(3)
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pp. 623-626
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1999 ◽
Vol 16
(9)
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pp. 1344
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2017 ◽
Vol 5
(4)
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pp. 18-23