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Abstrak :
Inthis paper, we propose a 1x2 and 1x4 optical power splitter from 1500 to 1600 nm based on multimode interference (MMI) structure with tapered input and output waveguides. The results obtained from modal propagation analysis (MPA) and beam propagation method (BPM) show better performance of the tapered structures than that of without taper in term of the power imbalance and insertion loss by 44.94% and 32.50% for 1x2 and 21.18 and 73.03% for 1x4 respectively. These suggest that the proposed structures may be a better candidate foe efficient wideband optical signal processing and communication.

Abstrak :
Recently, gallium nitride (GaN) material has attracted the attention of researchers as a candidate for third generation semiconductor material for optical telecommunication applications. In this research, a 2x2 multimode interference optical power splitter (MMI) based on a waveguide and ridge structure is proposed using gallium nitride material on a silicon (GaN/Si) substrate for optical telecommunication applications. The design optimization carried out resulted in two optical power splitter designs based on rib (design A) and ridge (design D) waveguide. Based on the simulation using the eigenmode expansion method (EME) algorithm, design A has an optimal dimension of 15 m 212 m with an insertion loss of 0.085 dB, power balancing of 0.007 dB, C-band (1530 nm – 1565 nm) broadband bandwidth of 0.140 dB, and fabrication tolerances for width and length are ± 0.3 m and ± 0.5 m, respectively. Meanwhile, design D has optimal dimensions of 15 m 214 m with insertion loss of 0.036 dB, power balancing of 0.017 dB, C-band broadband bandwidth of 0.088 dB, and fabrication tolerances for width and length respectively. of ± 0.3 m and ± 0.5 m