Mode field adapter is a transitional device that enables low loss coupling between fibers with different mode field diameters. It dynamically adjusts the beam diameter through tapered fibers or micro lens groups (insertion loss<0.5dB) to solve the mode mismatch problem between single-mode multi-mode or heterogeneous fibers. It is suitable for cross platform optical systems such as fiber lasers and heterogeneous optical networks.

Micro scale mode field precise matching "achieves ultra-low loss (<0.3dB) mode conversion between heterogeneous optical fibers (such as single-mode photonic crystal fibers) through gradient refractive index lens (GRIN) or fused tapered technology (transition zone length<1mm), providing an" optical impedance matching "solution for the interconnection of heterogeneous optical devices.