而在高粘度极性溶剂中，分子内旋转损耗是主要的非辐射衰减机制。
Whereas in polar media with high viscosity, the internal rotation loss is the majorly nonradiative decay process.
该设计以光子晶体光纤为基础，采用直接耦合的方法实现低损耗的光纤旋转连接。
Low loss connection of fiber optic rotary is realized by direct coupling of fiber, which is photon crystal fiber (PCF).
单通道光纤旋转连接器具有结构简单、重量轻和耦合损耗小的优点，但传输信号单一，不能双向传输的缺点限制了它的广泛应用。
Single channel fiber optic rotary joint has simple structure, small size and low optical losses, but the unidirectional transmission limits its wide applications.
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