【作者】 于岭；

【导师】 袁树忠；

【作者基本信息】 南开大学 ， 光学， 2004， 硕士

【摘要】 波分复用(WDM),尤其是密集波分复用(DWDM)技术使得通信带宽大大增加,成为目前开发和应用的热点。它的发展也对光纤放大器提出了更高的要求,譬如要求光纤放大器具有更大的带宽,具有自动增益控制、功率控制等功能。基于上述情况,并结合天津市科委基金重点项目——超宽带光纤放大器、智能光纤放大器和光源的研究等课题,论文主要围绕放大器的宽带化和增益控制两方面进行了一些理论和实验研究。主要工作如下:1.综合评述了DWDM系统中EDFA增益控制技术的发展趋势,包括增益平坦和增益锁定两方面内容,并对典型的实施方案进行了比较和分析,提出了几种实验方案。2.利用双折射光纤环镜设计并制作了一个结构简单的可调谐光纤衰减器,具有灵敏度高,偏振无关,低插入损耗和低成本等特性。实验证明它可以很方便的控制光功率。3.提出了一种由布拉格光纤光栅和高双折射光纤环镜共同构成波长选择器件的掺铒光纤激光器。获得了一系列波长间隔约为0.8nm,边模抑制比大于54dB的激光输出。实验中还通过调节偏振控制器改变环镜对不同波长的反射率,从而使得输出激光的功率在超过13.5dB的动态范围内得到了控制。4.提出了一种结构新颖的L-波段环形腔掺铒光纤激光器,有效的提升了L-波段铒光纤激光器的性能。这种利用光环形器将后向的ASE再引入铒光纤的前端,重复利用ASE的方法对超宽带连接中提高L-波段掺铒光纤放大器的增益也有借鉴价值。5.提出了一种高效、超宽带、平坦的超荧光光源结构。实验结果得到了覆盖C+L-波段的超荧光光源,在1527.2 -1603.2nm波长范围内,自发辐射谱功率高于-25.0dBm,自发辐射谱的不平坦度为±1.4dB。6.利用高双折射光纤环镜,设计了一种新颖的L-波段掺铒光纤放大器,可有效的改善L-波段的噪声状况,最多降低近6dB。7.分别优化C和L两个波段掺饵光纤放大器,利用并联方式实现了C+L-波段超宽带光纤放大器。研制出了一台结构简单,高增益低噪声,增益平坦的超宽带掺更多还原

【Abstract】 WDM/DWDM (Wavelength Division Multiplexing/Dense WDM) has already broadened the bandwidth of communication system, and become the highlight of exploitation and application. At the same time, there appears some further demand to the EDFA as the development of WDM/DWDM, such as the broad bandwidth, automatic gain control and automatic power control.According to the project of super-broadband fiber amplifier and intelligent fiber amplifier and resource, this dissertation focuses on the study of the broadband, the flatness and gain control of EDFA. The main contents are listed as follows.1.The integrated discuss of the development in EDFA gain control technology, including gain flattening and gain clamping techniques has been introduced. A series of typical schemes are compared and discussed. Several experiment schemes are presented.2. We have demonstrated a novel VOA based on high birefringence fiber loop mirror, which has many advantageous characteristics such as a simple structure, high flexibility, polarization independence, low insertion loss and low price, etc. Experimental proof shows that it is convenient to realize the control of optical power by using this VOA .3.A wavelength-tunable erbium-doped fiber laser by using FBG and HiBi fiber loop mirror as reflectors is presented. A series of lasers with about 0.8nm spacing have been achieved. The SMSR is higher than 54dB. A dynamic range of over 13.5dB of the output laser intensity has been realized by tuning the reflectivity of fiber loop mirror with polarization controller.4.A novel structure L-band erbium-doped fiber ring laser is demonstrated, which has much improved the performance of L-band fiber ring laser. To be recycled, the backward ASE was routed to the input of EDF by an optical circulator. This method is much use for reference to enhance the gain of L-EDFA in broadband link.5. A flat high efficiency super-broadband source was presented. We achieved a C+L-band super- fluorescent source, in the region from 1520 to 1600.4nm, the power of the ASE are over -25.0dBm and the ASE profile excursion is only±1.4dB in the region from 1527.2 to 1603.2nm.6. A novel structure L-band erbium-doped fiber amplifier by using HiBi fiber loop mirror as更多还原