GU Hao, TANG Min, CAO Min etc. Vortex Fiber Amplifier with Ultra-low Differential Mode Gain Based on Ring Core Fiber[J]. Chinese Journal of Luminescence, 2020,41(1): 55-62
GU Hao, TANG Min, CAO Min etc. Vortex Fiber Amplifier with Ultra-low Differential Mode Gain Based on Ring Core Fiber[J]. Chinese Journal of Luminescence, 2020,41(1): 55-62 DOI: 10.3788/fgxb20204101.0055.
Vortex Fiber Amplifier with Ultra-low Differential Mode Gain Based on Ring Core Fiber
which is based on a ring core fiber with erbium ions doped partially in the ring core areas. For the amplification characteristics of the erbium-doped fiber
the effects of fiber length
erbium-doped concentration and pump power on the gain characteristics of the signal modes are studied. The results show that the proposed fiber amplifier can support 22 orbital angular momentum (OAM) modes transmit stably. Meanwhile
the gain of all signal modes is larger than 23 dB
the signal-to-noise ratio is larger than 27 dB
and the differential mode gain (DMG) is less than 0.015 dB at C band (1 530-1 565 nm). The proposed vortex fiber amplifier based on the ring core fiber has the advantages of supporting large number of orbital angular momentum modes
low differential mode gain and high signal-to-noise ratio
which has important value for online amplification in an OAM-multiplex transmission system with long distance.
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