High Power-Efficiency, Low DMG Cladding-Pumped Few-Mode Er/Yb/P Co-Doped Fiber Amplifier for Mode Division Multiplexing

• Published in: Journal of lightwave technology Vol. 40; no. 22; pp. 7421 - 7430
• Main Authors: Qiu, Qiang, Gu, Zhimu, He, Le, Chen, Yang, Lou, Yang, Zhao, Xinyue, Yin, Xiaoke, Li, Wenzhen, Liu, Shaokun, Peng, Jinggang, Li, Haiqing, Xing, Yingbin, Chu, Yingbo, Dai, Nengli, Li, Jinyan
• Format: Journal Article
• Language: English
• Published: New York IEEE 15.11.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Absorption; Amplification; Amplifiers; Cladding; Claddings; Differential modal gain; Doped fibers; Energy conversion efficiency; Erbium; few-mode Er/Yb/P co-doped fiber amplifier; fiber optics; Ions; Multiplexing; Optical fiber amplifiers; Optical fiber communication; Refractive index; space-division multiplexing; Ytterbium
• ISSN: 0733-8724; 1558-2213
• DOI: 10.1109/JLT.2022.3202686

Mode division multiplexing (MDM) is considered to be an efficient solution to alleviate the exponentially increasing "capacity crunch". Here, we numerically and experimentally demonstrate a high power-efficiency, low differential mode gain (DMG) few-mode amplifier based on an M-type double-cladding Er/Yb co-doped phosphosilicate fiber. With a large-signal power of 4.1 dBm, the average DMG of <1.5 dB and the maximum gain of >28 dB were achieved for the LP 01 , LP 11 , LP 21, and LP 02 mode groups over the 1535-1565 nm range. Additionally, the saturation output power was measured in excess of 35 dBm, with a pump conversion efficiency (PCE) of >31%. This cladding-pumped few-mode Er/Yb co-doped fiber amplifier enables combined mode-division and wavelength-division multiplexed over large-capacity long-haul MDM transmission.