Lyngsø J K, Mangan B J, Olausson C B, Roberts P J
NKT Photonics A/S, Blokken 84, Birkerød, Denmark.
Opt Express. 2010 Jun 21;18(13):14031-40. doi: 10.1364/OE.18.014031.
We report on two types of polarization maintaining solid photonic crystal fibers that guide light by a combination of a photonic bandgap and total internal reflection. Group and phase birefringence are studied experimentally and numerically for stress-applying parts made from B-doped and F-doped silica. The stress field originating from Ge-doped cladding rods is shown to interfere with the stress field from the B-doped and F-doped rods. Since the differential expansion coefficients of B-doped and F-doped silica have opposite signs this interference is either destructive or constructive. Consequently, we found that the fiber with F-doped stress applying parts has the highest modal phase birefringence, and polarization cross talk is characterized by an h-parameter below 310(-5) m(-1).
我们报道了两种保偏固体光子晶体光纤，它们通过光子带隙和全内反射的组合来引导光。对由硼掺杂和氟掺杂二氧化硅制成的应力施加部分进行了实验和数值研究，分析了其群双折射和相双折射。结果表明，源自锗掺杂包层棒的应力场会干扰硼掺杂和氟掺杂棒产生的应力场。由于硼掺杂和氟掺杂二氧化硅的微分膨胀系数具有相反的符号，这种干扰要么是相消的，要么是相长的。因此，我们发现具有氟掺杂应力施加部分的光纤具有最高的模态相双折射，并且偏振串扰的特征是h参数低于3×10⁻⁵ m⁻¹。
