Low-crosstalk few-mode EDFAs using retro-reflection for single-mode fiber trunk lines and networks

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Abstract
Few-mode EDFAs with low channel crosstalk can replace multiple parallel single-mode EDFAs in single-mode fiber trunk lines and networks. Here we proposed a low-crosstalk few-mode EDFA by exploiting the unitary property of the coupling matrix of a symmetric photonic lantern. We experimentally demonstrated a 3-channel few-mode EDFA using retro-reflection of a 3-mode symmetric photonic lantern. The small signal gain for all three channels are measured to be larger than 25 dB over the entire C-band and the crosstalks are below −10 dB.
Funding Information
  • Army Research Office (W911NF-12-1-0450, W911NF17-1-0500, W911NF17-1-0553)
  • National Science Foundation (ECCS-1711230, ECCS-1808976)

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