Experimental characterization of Raman overlaps between mode-groups

Erik Nicolai Christensen, Jacob Gade Koefoed, Søren Michael Mørk Friis, Mario A. Usuga Castaneda, Karsten Rottwitt

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Mode-division multiplexing has the potential to further increase data transmission capacity through optical fibers. In addition, distributed Raman amplification is a promising candidate for multi-mode signal amplification due to its desirable noise properties and the possibility of mode-equalized gain. In this paper, we present an experimental characterization of the intermodal Raman intensity overlaps of a few-mode fiber using backward-pumped Raman amplification. By varying the input pump power and the degree of higher order mode-excitation for the pump and the signal in a 10km long two-mode fiber, we are able to characterize all intermodal Raman intensity overlaps. Using these results, we perform a Raman amplification measurement and demonstrate a mode-differential gain of only 0.25dB per 10dB overall gain. This is, to the best of our knowledge, the lowest mode differential gain achieved for amplification of mode division multiplexed signals in a single fiber.
Original languageEnglish
Article number34693
JournalScientific Reports
Number of pages6
Publication statusPublished - 2016

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