The present invention aims at providing a connecting method capable of suppressing
an influence of stray light for a plurality of optical function devices formed
on the same substrate, and an optical apparatus applied with the control method.
To this end, in the connecting method of optical function devices according to
the present invention, the plurality of optical function devices formed on the
same substrate are cascade connected so that both ends of an optical path passing
through the plurality of optical function devices are positioned on the same end
face of the substrate. According to such a connecting method, it becomes possible
to effectively suppress a leakage of stray light from an optical input side to
an optical output side.
