Zhao Qiang, Cui Kaiyu, Feng Xue, Liu Fang, Zhang Wei, Huang Yidong
Appl Opt. 2013 Sep 1;52(25):6245-9. doi: 10.1364/AO.52.006245.
We demonstrate a compact thermo-optic variable optical attenuator (VOA) based on the cutoff effect of W1 photonic crystal waveguide (PCW). In experiment, a variable attenuation range of 29 dB is achieved with a device length of only 16.8 μm. The coupling loss is also reduced by 7.5±2.5 dB through introducing low-group-index tapers between the W1 PCW and strip waveguide. This VOA provides the largest variable attenuation range in the reported tunable PCW device to our knowledge.
我们展示了一种基于W1光子晶体波导（PCW）截止效应的紧凑型热光可变光衰减器（VOA）。在实验中，仅16.8μm的器件长度就实现了29dB的可变衰减范围。通过在W1 PCW和条形波导之间引入低群折射率渐变，耦合损耗也降低了7.5±2.5dB。据我们所知，该VOA在已报道的可调谐PCW器件中提供了最大的可变衰减范围。
