采用两段级联掺铒光纤、９８０ｎｍ和１４８０ｎｍＬＤ混合泵浦方式，实验分析比较了内插光隔离器和内插光隔离－耦合环光路结构掺铒光纤放大器（ＥＤＦＡ）的增益、噪声系数和输出功率特性。研制出内插光隔离－耦合环的ＥＤＦＡ，在信号波长１５５３．５ｎｍ处，小信号增益为４２．８ｄＢ，噪声系数为４．４ｄＢ，输出功率为１５．２ｄＢｍ。 Two cascaded erbium-doped fibers, 980 nm and 1480 nm LD hybrid pumping methods were used to analyze the gain, noise figure and output of the EDFA with interpolation opto-isolator and EDA (optical isolation-coupling ring) Power characteristics. The EDFA with an optically isolated-coupled loop was developed. At a signal wavelength of 1553.5 nm, the small signal gain was 42.8 dB, the noise figure was 4.4 dB, and the output power was 15.2 dBm.