Low crosstalk and low driving power X-intersecting 2×2 waveguide switch

摘要

We propose a X-intersecting 2×2 waveguide TO (Thermo-Optic) switch, which realize the low driving power operation with the low crosstalk. The switch is composed of the wide and thin core, which expands the optical mode field size under the single mode propagation. The expanded mode field size consequently reduces the switching crosstalk with narrow X-intersection angles, which is effective to improve the driving power. The switch with this core design was fabricated in the fluorinated polyimide, and then exhibited the crosstalk of less than -40dB. The switch also showed the extinction ratio of greater than 30dB when the driving power of approximately 100mW was applied.