Connectors and fiber termination
(i) Butt-joint connectors
made up of a special type of material called ferrule, composing of
metal/glass/plastic materials. The fiber is send into the drilled hole of the
ferrules and is aligned properly with the help of the alignment sleeve. The
distance between the fibers is minimized by adjusting the alignment sleeve and
the guide ring, and is used to match the ends of the fibers. Once the matching
was done, the light from one fiber can be easily coupled to the other fiber
with minimum losses.
(ii) Expanded beam connectors:
consists of a collimating lens at the end of transmitting fiber and focusing
lens at entrance of the receiving fiber. Light coming out from the transmitting
fiber is made to fall over the collimating lens. The collimating lens makes the
beam parallel and is focused into the focusing lens. After passing through the
focusing lens, the light is coupled into the receiving fiber without any loss.
Thus the loss is minimized.