What is FBT coupler

Optical splitters can be divided into two types: fusion taper type (FBT Coupler) and planar waveguide type (PLC splitter).

The fusion taper type FBT coupler is to disturb two (or more than two) optical fibers with the coating layer removed in a certain way, melt under high temperature heating, and stretch to both sides at the same time, and finally form a double cone in the heating area. The special waveguide structure in the form of a body can obtain different light splitting ratios by controlling the twisting angle and stretching length of the optical fiber. Finally, the taper area is cured on the quartz substrate with curing glue and inserted into the stainless copper tube. This is the FBT coupler. .