Amplification of 12 OAM Modes in an air-core erbium doped fiber
Date
2015
Authors
Kang, Q.
Gregg, P.
Jung, Y.
Lim, E.L.
Alam, S.U.
Ramachandran, S.
Richardson, D.J.
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Journal article
Citation
Optics Express, 2015; 23(22):28341-28348
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Abstract
We theoretically propose an air-core erbium doped fiber amplifier capable of providing relatively uniform gain for 12 orbital angular momentum (OAM) modes (vertical bar L vertical bar = 5, 6 and 7, where vertical bar L vertical bar is the OAM mode order) over the C-band. Amplifier performance under core pumping conditions for a uniformly doped core for each of the supported pump modes (110 in total) was separately assessed. The differential modal gain (DMG) was found to vary significantly depending on the pump mode used, and the minimum DMG was found to be 0.25 dB at 1550 nm provided by the OAM (8,1) pump mode.
A tailored confined doping profile can help to reduce the pump mode dependency for core pumped operation and help to increase the number of pump modes that can support a DMG below 1 dB. For the more practical case of cladding-pumped operation, where the pump mode dependency is almost removed, a DMG of 0.25 dB and a small signal gain of >20 dB can be achieved for the 12 OAM modes across the full C-band.
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Link to a related website: https://eprints.soton.ac.uk/384305/1/oe-23-22-28341.pdf, Open Access via Unpaywall
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Copyright 2015 Optical Society of America