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提出了一种基于三芯光子晶体光纤的定向耦合器。通过增大纤芯两侧空气孔直径来引入非对称纤芯,该方法有效地实现了1×3分束的目的。数值分析表明,该三芯光子晶体光纤定向耦合器的工作带宽可达113.9nm(具体为波长从1530.9～1644.8nm)且均匀性小于0.4dB、偏振相关损耗低于0.2dB。此外,这种结构能够有较大的制作容差,具体表现为器件长度在光纤长度(20.9mm)的±4%范围内变化都能保证工作带宽不小于80nm。
A directional coupler based on three-core photonic crystal fiber is proposed. The asymmetric core is introduced by increasing the diameter of the air holes on both sides of the core, which effectively achieves a 1x3 splitter. Numerical analysis shows that the working bandwidth of the three-core photonic crystal fiber directional coupler can reach 113.9nm (wavelength is from 1530.9 to 1644.8nm) and the uniformity is less than 0.4dB and the polarization-dependent loss is less than 0.2dB. In addition, this structure can have a larger manufacturing tolerance, specifically as a function of the device bandwidth of no less than 80 nm over a ± 4% range of the fiber length (20.9 mm).