Few-mode erbium-doped fiber amplifier design method based on the signal-pump overlap integral

Adolfo F. Herbster; Murilo A. Romero

doi:10.1117/1.OE.53.9.096101

2 September 2014 Few-mode erbium-doped fiber amplifier design method based on the signal-pump overlap integral

Adolfo F. Herbster, Murilo A. Romero

Author Affiliations +

Optical Engineering, Vol. 53, Issue 9, 096101 (September 2014). https://doi.org/10.1117/1.OE.53.9.096101

Abstract

Space-division multiplexing allows an increase of link capacity by using either multicore or single-core few-mode (FM) optical fibers. In the case of FM systems, each mode carries its own data stream and long-haul transmission can be hampered by the use of conventional erbium-doped fiber amplifiers (EDFAs), since because of distinct field profile configurations, each mode experiences a different value of optical gain. The role of the FM-EDFA designer, usually done by solving rate and propagation equations, is to define both the fiber cross-section and the pumping configuration to provide the best possible mode equalization of optical gain and noise figure. An optimization method is proposed here based on the definition of a figure of merit related to the equalization of the pump-mode signal overlap integral, significantly reducing computation time and allowing a multiobjective optimization approach. The results obtained were validated against the solution provided by the full set of rate and propagation equations and we conducted an FM-EDFA optimization case study. Our double-ring Er doping profile design requires a single 180-mW LP₁₁ pump to provide a mean gain of 21.3 dB, within 0.6 dB of equalization for each of the four modes considered.

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Adolfo F. Herbster and Murilo A. Romero "Few-mode erbium-doped fiber amplifier design method based on the signal-pump overlap integral," Optical Engineering 53(9), 096101 (2 September 2014). https://doi.org/10.1117/1.OE.53.9.096101

Published: 2 September 2014

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