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设计了玻璃基K+-Na+离子交换1×32级联Y分叉光功分器。由于采用了一种新型的器件结构形式,光功分器的长度得以缩短,当输出波导间距为127μm、波导最小曲率半径为30 mm时,器件总长只有20 mm。为了提高器件的功分均匀性,对波导的泄漏模进行了控制,使一阶泄漏模的损耗速度达到32 dB/cm。为了提高波导与光纤的耦合效率,器件输入输出端进行了光斑尺寸变换,使光纤-波导的耦合损耗降低到0.26 dB。
The glass-based K + -Na + ion exchange 1 × 32 cascaded Y-split optical splitter was designed. Due to a new type of device structure, the length of the optical splitter can be shortened. When the output waveguide pitch is 127μm and the minimum radius of curvature of the waveguide is 30mm, the total length of the device is only 20mm. In order to improve the power uniformity of the device, the leakage mode of the waveguide is controlled so that the loss rate of the first-order leakage mode reaches 32 dB / cm. In order to improve the coupling efficiency between the waveguide and the optical fiber, the spot size conversion is carried out at the input and the output of the device, so that the coupling loss of the optical fiber and the waveguide is reduced to 0.26 dB.