Based on the above background and under the support of tianjin natural science foundation project : intelligent fiber amplifiers and light sources , tianjin natural science foundation project : ( c + l ) broadband fiber amplifier and nankai - delta ( tianjin ) project : development of gain flattened erbium - doped fiber amplifiers , this dissertation is mainly focused on the study of novel gc - edfa , gain and nf ( noise figure ) improvement of edfa , light sources , multi - wavelength fiber laser and voa ( variable optical attenuator ) 基于以上背景,在天津市重点基金项目? ?智能型光纤放大器和光源的研究、天津市重点基金项目? ? ( c + l )超宽带掺杂光纤放大器和南开-达尔泰(天津)项目? ?开发增益平坦的掺铒光纤放大器的支持下,本论文主要围绕新型gc - edfa 、 edfa性能的优化、增益控制用光源、多波长光纤激光器以及可调光衰减器等课题进行了理论和实验研究。
Meanwhile , with the development of wdm / dwdm communication systems , more and more attention is paid on the edfas with broader bandwidth , good gain and noise feature , and gain clamping , etc . according to the tianjin natural science foundation project : intelligent fiber amplifiers and light sources , the tianjin natural science foundation project : ( c + l ) broadband fiber amplifier and the nankai - delta ( tianjin ) project : development of gain flattened erbium - doped fiber amplifiers , this dissertation is mainly focused on the study of novel gain - clamped edfa , light sources , multi - wavelength fiber laser and variable optical attenuator for gain - clamped usage , gain and noise improvement of edfa , and broadband edfa Wdm / dwdm通信系统的发展又需要edfa具有更大的带宽、优良的增益和噪声特性和增益控制等功能。基于上面的情况,并结合天津市重点基金项目? ?智能光纤放大器光源的研究、天津市重点基金项目? ? ( c + l )超宽带掺杂光纤放大器和南开-达尔泰(天津)项目? ?开发增益平坦的掺铒光纤放大器等课题,论文主要围绕新型增益控制edfa 、增益控制用光源、多波长激光器及可调光衰减器、 edfa性能优化和超宽带edfa等方面进行了理论和实验研究。
In general , the thesis covers the following aspects : first , in accordance with the property of variable tuning optical attenuator ( voa ) , which is analyzed and discovered through diffraction theory , selected block plate and made attenuator , and achieved satisfactory effect by experiment in light transportation circuit 针对可调型机械挡光衰减器的挡光特点，从衍射理论的角度分析和发现该器件的衰减特征，并根据该特征选择挡光片，制作了衰减器。在传输光路上试用，获得了较好的效果。
Through persistant improvement of the structure , we successfully designed and fabricated a voa as small as 25x10x7 mm3 . the attenuation was introduced by a micro - silicon mirror , with its direction can be fine tuned through the balance of a pair of electromagnetic forces 于是本文提出改进方案，设计并制作了一种利用永磁体磁力作为回复力的可调光衰减器，器件封装尺寸进一步降低，具有较好的工作线性度及稳定度，且结构紧凑，工作稳定，工艺简单，成本低廉，易于批量生产。
