当阳光照射到稀疏得如同云彩一般的微小颗粒上，云隙光便随之出现。

These appear when sunlight strikes tiny particles too scanty to appear as clouds.

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研究了光子晶体多模波导在非光子带隙区光场的传输特性。

The properties of the propagating field in multimode photonic crystal waveguides (PCWs) exhibiting no photonic band gaps (PBGs) are investigated.

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本文讨论了空气隙型光固定衰减器的回波损耗。

This paper discusses the return loss in air-space type fixed optical attenuator.

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