Abstract
In this paper, we experimentally demonstrate an add-drop filter based on wavelength-dependent light coupling between a lithium-niobate (LN) microwaveguide chip and a microfiber knot ring (MKR). The MKR was fabricated from a standard single-mode fiber, and the LN microwaveguide chip works as a robust substrate to support the MKR. The guided light can be transmitted through add and drop functionality and the behaviors of the add-drop filter can be clearly observed. Furthermore, its performance dependence on the MKR diameter is also studied experimentally. The approach, using a LN microwaveguide chip as a platform to couple and integrate the MKR, may enable us to realize an optical interlink between the microstructured chip and the micro/nano fiber-optic device.
Highlights
Micro/nano optical fiber (MNOF) is one of the promising components in future optical microand nano-devices or systems [1]
The add-drop filter configuration we reported here was constructed by a LN annealed proton exchange (APE) micropopular and conventional methods to fabricate an optical waveguide on a LN substrate are waveguide and microfiber knot ring (MKR)
We fabricated a microfiber with a diameter of 5.6 μm and knotted it into a MKR
Summary
Micro/nano optical fiber (MNOF) is one of the promising components in future optical microand nano-devices or systems [1]. Lithium niobate (LN) is a suitable substrate material for integrated optical devices It is transparent from 0.4 μm to 5 μm, covering a wide transmission window in optical communication. The add-drop filter configuration we reported here was constructed by a LN APE micropopular and conventional methods to fabricate an optical waveguide on a LN substrate are waveguide and microfiber knot ring (MKR). The LN microwaveguide chip is a suitable electro-optic and nonlinear interconnection platform between fiber-optic micro-/nano-devices (such as MKR) and the robust LN material chip. This configuration may pave an alternative way to build controllable photonic system
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