The polarization filtering property of ideal PhC waveguides can be reinstated in the practical PhC slab waveguide also which was compromised due to the newly originated index guided modes in PhC slab waveguides. This can be done by controlling the side wall corrugation of the guiding portion of the PhC waveguide. By doing so, the guided TE, TM, and continuum of bands can be decoupled with each other for a sufficient range of operating frequencies. This way a TM-pass efficient polarization filters has been shown using silicon PhC slab waveguide, which gives a maximum extinction ratio of ≈ 43 dB, insertion-loss -0.5 dB along with ≈ 100 dB nm bandwidth in merely 20 periods long structure.
A silicon photonic crystal (PhC)-based structure is proposed to efficiently couple power from two different wavelengths, targeted to the application of an integrable Raman amplifier. The coupler uses two asymmetrical PhC waveguides as input ports which are joined together and the coupled power is directed to a slotted photonic crystal waveguide-based output port. Coupling efficiency and the other performance metrics are evaluated using a three-dimensional full-vector finite-difference time domain simulation method, which is tested for accuracy using some existing experimental structures and corresponding results. The heuristic approach has been adopted to optimize the design for maximizing the coupling efficiency. Dependence of the coupling performance on different design parameters has also been investigated. Simulations exhibit ∼3-dB coupling losses for both arms in a small footprint as small as ∼54 μm2.
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