Interlinked add-drop filter with amplitude modulation routing a fiber-optic microring to a lithium niobate microwaveguide

Abstract

We propose and experimentally demonstrate a new electro-optically controllable add-drop filter based on light coupling between a microfiber knot ring (MKR) and a lithium niobate (LN) microwaveguide. In our design, the MKR works as a resonator and routes the resonant light into the LN microwaveguide. The LN microwaveguide, as an excellent intermediary between electronics and optics, is a robust platform that not only enables stable support and manipulation of the MKR but also provides amplitude tunability taking advantage of its electro-optic property. Two add-drop filters with different diameters of the MKR, 1.12 mm, and 560 μm respectively, are studied, and a maximum amplitude tunability of ∼0.139 dB/V is obtained. The results show that this design can be a solution to interconnect a microstructured optical fiber with a microstructured on-chip device and provide an effective method to realize the active on-chip integration of the conventional fiber system.

Race‐Track Type Resonator Integrated Active Add‐Drop Filter from Flexible Organic Crystals: Experiments and Numerical Calculations

“…Photonic ADF is a key component in PICs that are used in wavelength division multiplexers, optical modulators and optical switches. [ 42–48 ] ADF consists of a looped waveguide or ring resonator (RR) and one or two bus waveguides. Most ADFs employ circular ring‐resonators (RR) to manipulate the direction of the filtered optical signals.…”

“…Thus far, organic crystal-based monolithic add-drop filters (ADF), [40,41] directional couplers [33,34] and circuits [31][32][33][34][35]40,41] have been realized.Photonic ADF is a key component in PICs that are used in wavelength division multiplexers, optical modulators and optical switches. [42][43][44][45][46][47][48] ADF consists of a looped waveguide or ring resonator (RR) and one or two bus waveguides. Most ADFs employ circular ring-resonators (RR) to manipulate the direction of the filtered optical signals.…”

Fiber-Optic Magnetic Field Sensing Based on Microfiber Knot Resonator with Magnetic Fluid Cladding

“…Recently, the micro-nano fiber (MNF) ring resonator has been intensively investigated for its ability to measure various physical parameters, such as magnetic field, temperature, bio-chemical solution, current, salinity, force, electric field, and refractive index (RI) [1,2,3,4,5,6,7,8]. The advantages of the structure lie in its small size, anti-interference, quick response, high resolution, low detection limit and high sensitivity [9,10,11,12,13,14,15,16].…”