adhesion splice
Adhesive splicing, as the name suggests, is a non-detachable connection technique for optical fibers, based on bonding the two fiber ends together.
In this splice, the fibers are broken using a fiber cutting device and then cleaned. After that, the fiber ends are inserted into a mechanical device that adjusts the fiber ends against each other. The fiber ends are fixed and the end faces are joined by means of an adhesive that is cured with UV light. This adhesive, which is also between the fibers, is largely responsible for the damping. The insertion loss is between 0.2 dB and 0.7 dB.
Adhesive splices are only possible with multimode fibers.