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基于少模光纤(FMF)的模分复用(MDM)传输系统,模式差分群时延(MDGD)是影响系统设计的关键因素之一。考虑实际光纤制备工艺,数值分析了阶跃折射率(SI)光纤、渐变折射率(GI)光纤、带有外下陷包层的阶跃型光纤和带有外下陷包层的渐变型光纤中不同的MDGD特性。在支持四个导模条件下,优化设计得到两种不同折射率剖面分布的四模光纤,分别具有较大的MDGD(LP11,LP12,LP02与LP01的MDGD分别是4.65,10.02,11.73ps/m)和较小的MDGD(LP11,LP12,LP02与LP01的MDGD分别是-0.049,-0.258,-0.168ps/m)。制备了阶跃折射率分布的少模光纤,其实测基模的损耗为0.23dB/km(1550nm)和0.37dB/km(1310nm)测量及分析结果证明其能够支持MDM应用。
Mode differential group delay (MDGD) is one of the key factors affecting the system design based on Modular Modulation and Multiplex (MDM) transmission system with less mode fiber (FMF). Considering the actual optical fiber manufacturing process, the differences between the step index (SI) fiber, the graded index (GI) fiber, the step-type fiber with out-depressed cladding, and the tapered fiber with out-depressed cladding are numerically analyzed MDGD features. Under the condition of supporting four guided modes, two kinds of four-mode optical fiber with different distribution of refractive index profiles are obtained, which have larger MDGD (LP11, LP12, LP02 and LP01 respectively, the MDGD is 4.65,10.02,11.73ps / m ) And smaller MDGD (LP11, LP12, MDGD for LP02 and LP01 are -0.049, -0.258, -0.168 ps / m, respectively). A small mode fiber with step index distribution was fabricated. The measured fundamental mode loss was 0.23dB / km (1550nm) and 0.37dB / km (1310nm). The measurement and analysis proved that it can support MDM applications.