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根据长周期光纤光栅(LPG)的透射谱公式,分析了长周期光纤光栅均衡滤波器的特性,并对Er3+/Yb3+双包层光纤和集束熔锥耦合结构的光纤放大器进行了实验研究。结合不使用增益平坦技术条件下增益特性曲线的特点,设计了一种由三个LPG组成的均衡滤波器。实验结果表明,在1 525~1 565 nm波段上实现了50个信道的WDM光放大输出,平坦度为0.3 dB。
According to the transmission spectrum formula of long period fiber grating (LPG), the characteristics of long period fiber grating equalization filter are analyzed. The experiment of the optical fiber amplifier with Er3 + / Yb3 + double clad fiber and the bundle fusion cone coupling structure is carried out. Combined with the characteristics of gain curve without gain flatness, an equalization filter composed of three LPGs is designed. Experimental results show that 50 channels of WDM optical amplifier output are achieved in the band of 1 525 ~ 1 565 nm with a flatness of 0.3 dB.