An All-Fiber Multimode Interference Based 1×4 Power Splitter Using Square Core Multimode Fiber

We investigate the performance of a highly compact (
$\leq 1$
cm) all-fiber multimode interference (MMI) device for splitting optical power from a standard single mode fiber (SMF) input port to four
(4)
SMF output ports. In C-band, the best and worst case uniformity among the output ports are obtained as 0.14 dB and 1 dB, respectively. This compact device provides a low-cost, high-performing solution for potential usage in optical networks.