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提出了一种新型的双芯光子晶体光纤,应用全矢量有限元方法分析了光纤各种结构参数对光纤宽带特性和偏振无关特性的影响.在此基础上优化设计了一种50:50的双芯光子晶体光纤耦合器,在1.225—1.675μm波长范围内实现分光比小于1%、两偏振态之间的分光比差小于0.5%的优良特性.由于引入了仅对偏振特性影响明显的相对独立的中心调制区,不仅降低了光纤的优化设计难度,而且实现了与普通单模光纤相匹配的模场特性,能有效地降低耦合器的接续损耗与制作难度.研究成果为研制接续损耗低、超宽工作带宽、偏振不敏感等特性的新型光定向耦合器提供了理论基础.
A new type of double-core photonic crystal fiber is proposed, and the effect of various structural parameters of the fiber on the characteristics of wide-band and polarization-independent fiber is analyzed by the full vector finite element method. On this basis, a 50:50 double Core photonic crystal fiber coupler achieves an excellent characteristic that the spectral ratio is less than 1% and the spectral ratio difference between the two states of polarization is less than 0.5% in the wavelength range of 1.225-1.675 μm. Since the introduction only has a relatively independent influence on the polarization characteristics , Which not only reduces the difficulty of optical fiber design but also realizes the mode field matching with ordinary single-mode optical fiber, which can effectively reduce the splice loss and difficulty of the coupler.The research results are as follows: Wide working bandwidth, polarization insensitive characteristics of the new optical directional coupler provides a theoretical basis.