对特征方程直接求导解得了基模群时延和群速色散,讨论了双包层单模光纤不同折射率分布对传播常数、群时延、群速色散以及零色散点波长的影响.研究结果表明:光学参数,即纤芯和外包层的相对折射率(P)以及内包层和外包层的相对折射率(R)对该类光纤的传播常数、群速度、群速色散和零色散点波长均有比较明显的影响,影响的大小及规律随参数的不同又有所不同.这些规律为设计满足不同色散要求的双包层单模光纤提供了理论依据.
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