Ultracompact photonic crystal polarization beam splitter based on multimode interference.
- 28 January 2010
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 49 (4), 724-731
- https://doi.org/10.1364/ao.49.000724
Abstract
We propose a theoretical design for a compact photonic crystal (PC) polarization beam splitter (PBS) based on the multimode interference (MMI) effect. The size of a conventional MMI device designed by the self-imaging principle is not compact enough; therefore, we design a compact PC PBS based on the difference of the interference effect between TE and TM modes. Within the MMI coupler, the dependence of interference of modes on propagation distance is weak for a TE wave and strong for a TM wave; as a result, the length of the MMI section can be only seven lattice constants. Simulation results show that the insertion losses are 0.32 and , and the extinction ratios are 14.4 and for Port 1 (TE mode) and Port 2 (TM mode), respectively.
Keywords
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