Theoretical Modeling of Multi-Channel Intracavity Spectroscopy Technology Based on Mode Competition in Er-Doped Fiber Ring Laser Cavity. - Haiwei Zhang; Liangcheng Duan; Yan Zhao 027; Lifang Xue; Pengbo Jiang; Jun Liu; Yangbo Bai; Wei Shi; Jianquan Yao (Sensors, 2020)