A new type of TE-TM mode splitter is proposed, which uses an asymmetri
c Y-junction with a gap region. It does not require external electric
field and can be fabricated by only titanium diffusion technique. The
transmission characteristics of the splitter are simulated by means of
the beam propagation method (BPM). The results show that the power sp
litting ratios for TE-TM modes are 20.3 dB and 23.5 dB, respectively a
nd the excess losses both are below 0.25 dB.