增益钳制掺铒光纤放大器特性研究

The Characteristic Investigation of Gain-clamped EDFA

报道了一种新型基于环形激光腔的增益钳制掺铒光纤放大器.得到了较好的增益钳制效果和增益平坦度,利用980nm半导体激光器泵浦12m长掺铒光纤形成激光增益,观测到30nm增益带宽.通过反馈1520nm激光,在可变衰减器不同值测量了输入信号从-40～10dBm的增益,其小信号增益被钳制在16dB.可为40个波分复用（WDM）信道波长提供增益钳制及平坦的放大功能.

A novel gain-clamped erbium doped fiber amplifier （EDFA） based on ring erbium-doped fiber laser is demonstrated. This new design provides a good gain clamping as well as a gain flattening without any gain flattening filter, 12m long low erbium doped fiber was used as gain medium pumped by 980nm laser diode（LD）. The 30nm flattened amplification bandwidth was obtained with forward pumping. By means of the 1520nm feedback laser the gain was clamped at 16dB. The gain characteristics against input signal power for both open-ring and the gain-clamped systems with different VOA losses were experimented, when the input power level increased from -40dBm to 10dBm, the signal gain was performed stabilization. The gain ripple was less than 0.1 dB from input signal power -40dBm to 0dBm by settling the VOA at 2dB where the amplifier had a flatter gain spectrum. Small signal gain of 20dB was achieved at 1550nm with input power of .40dBm and the saturated output power could reach to 16dBm. Experimental results show that the signal gain was clamped and this gain-damped erbium fiber amplifier could support a 40 channel WDM system.