For mode division multiplexing systems,a few-mode erbium-doped fiber(FM-EDF)amplifier that combines high mode gain and broadband wide gain characteristics has high application value.Using a modified chemical vapor deposition(MCVD)technology combined with a solution method,a FM-EDF is fabricated.The absorption coefficients of the FM-EDF at 976 nm and 1 530 nm are 10.6 dB/m and 35.0 dB/m,respectively.According to theoretical calculation of finite element difference module in COMSOL software,the FM-EDF can support the transmission of 10 spatial modes(LP01,LP11a/b,LP21a/b,LP02,LP31a/b,and LP12a/b modes).Furthermore,an all-fiber amplification system based on this FM-EDF is constructed and its optical mode amplification characteristics are experimentally studied.The results show that within the bandwidth range of 40 nm(1 525～1 565 nm),the gain of all 10 modes could be greater than 17.0 dB,and differential modal gains are less than 0.5 dB.Therefore,the widespread application of FM-EDF amplification technology in mode division multiplexing systems can further expand the capacity of optical fiber communication,and has important practical application significance.
optical fiber amplifierfew-mode erbium-doped fiber(FM-EDF)few-mode amplifiermode division multiplexing system
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