We proposed a C+L band broadband fiber amplifier based on erbium-ytterbium-phosphorus co-doped microstructured fiber (EYPDMOF). By introducing P5+ to suppress the excited state absorption (ESA) of Er3+, the luminescence performance of Er3+ in the L-band was significantly enhanced. In addition, by introducing a ring of air holes in the fiber structure, efficient coupling of pump light and long-distance transmission in the longitudinal direction was achieved. For an active fiber length of 8 m, a gain of more than 10 dB was achieved at 1607 nm, with an average gain of 21.6 dB in the range of 1535-1607 nm. Compared with the parallel fiber amplifiers currently used for C+L band amplification, the EYPDMOF amplifier achieves better integration and lower insertion loss, providing strong experimental validation and technical support for the engineering of C+L band broadband amplifiers.
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