Abstract
LP<sub>01</sub> and LP<sub>11</sub> mode interferences in high-birefringence (Hi-Bi) panda fibers
are theoretically and experimentally presented. The propagation characteristics of
both the fundamental and second-order modes in Hi-Bi panda fibers are investigated,
and the interference output intensity distribution of the LP<sub>01</sub> and LP<sub>11</sub> modes in
panda fibers are thoroughly examined. An experiment is conducted to verify the
feasibility of modal interference sensors. The results show that the two-lobe
interference pattern of panda fibers generates energy exchanges when external strain
is applied on the fiber. Moreover, Hi-Bi panda fibers can be used to design voltage
sensors.
© 2012 Chinese Optics Letters
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