Ultra broadband, low loss and polarization independent silicon nitrite integrated optical power splitter

Silicon nitride (SiN) has been widely investigated as a promising integration platform for photonic applications. In this paper, we propose an optical power splitter based on SiN with high transmission efficiency for both TE and TM polarizations over a broad operation bandwidth ranging from 1400 nm to 1700 nm. In addition, unequal power splitting ratios can be achieved with the proposed device by using asymmetric gap sizes. Furthermore, the proposed power splitter is ultra-compact with only 13 um length, and hence, it is promising for large-scale photonic integrations on SiN.