Long period gratings (LPGs) in singlemode fibers have been used in recent years to make optical sensors.
The grating-assisted coupling of light from the bound fibre mode to a cladding mode is sensitive to local influences
such as temperature and stress. In this paper, we investigate the possibility of using LPGs to modify the behavior of
planar multimode interference (MMI) devices by coupling power between selected bound modes of the planar
device. In particular, it is shown that by applying an LPG to a MMI 1xN splitter, the splitting ratio can be changed.
By making the grating dynamic, a tunable splitter can be realized. Examples are given for 1x2, 1x3 and 1x5
splitters. Possible methods for realizing such devices are discussed.
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