基于长周期光纤光栅滤波器的掺铒光纤放大器理论和实验研究

从理论和实验上研究了带有高频二氧化碳激光写入的低成本长周期光纤光栅（LPFG）掺铒光纤放大器（EDFA）.结果表明,单波长和多波长EDFA的性能都可以通过在掺铒光纤（EDF）中插入长周期光纤光栅用作自发辐射噪声（ASE）滤波器或增益平坦器来提高性能.优化设计了带LPFG噪声滤波器的线放EDFA,与没有LPFG噪声滤波器相比,线放的噪声和小信号增益分别被减小和提高了约0.5 dB和7 dB。通过在多波长EDFA的EDF中插入一个LPFG增益平坦滤波器的方法,获得了1.5 dB的增益平坦度,与没有LPFG平坦器相比,EDFA的噪声被减小了0.1 dB,增益被提高了1 dB.

Theoretical and Experimental Investigation on Erbium-Doped Fiber Amplifiers with Long-Period Fiber Grating Filters

Erbium-doped fiber amplifiers (EDFAs) with low-cost long-period fiber gratings (LPFGs) fabricated by high-frequency CO2 laser pulses are investigated theoretically and experimentally. Results shows that Performances of EDFAs for both single-wavelength and multi-wavelength applications can be improved via inserting a LPFG into the erbium-doped fiber (EDF) as an ASE noise filter or a gain equalizer. Optimization of an in-line EDFA with a LPFG is also provided. The NF of such an in-line EDFA is improved by ~0.5 dB and its small-signal gain is enhanced by 7 dB, compared with that without filtering. A multi-wavelength EDFA with a gain flatness of ~1.5 dB is simply achieved via inserting a LPFG into the middle of an EDF as a gain equalizer, accompanying with a gain improvement of ~1 dB and a NF reduction of ~0.1 dB compared with the EDFA having a LPFG located after the EDF.