Experimental Demonstration of the Anti-Symmetric Sampled Bragg Grating

In this letter, we provided a proof-of-concept study on the anti-symmetric sampled Bragg grating (ASBG) with π equivalent phase shift (π-EPS) in silicon-on-insulator (SOI). A four-channel narrow-band passive filter array was fabricated. Experimental results show that the 0th-order resonance is totally eliminated, while the +1st-order resonance is maintained. In addition, 3-D finite-difference-time-domain (3-D-FDTD) algorithm was also used to analyze the other characteristics of this structure, such as the radiation phenomenon caused by anti-symmetric feature. Since the anti-symmetric basic grating combined with sampling pattern could equivalently realize various grating structures, ASBG can be used for multi-wavelength photonic devices, such as DFB laser array, sensor array, electrooptic modulator array, and so on.