Acta Optica Sinica, Volume. 41, Issue 20, 2005001(2021)
Design of Narrow-Band Flat-Top Filter Based on Cascaded Compound Gratings
As key filtering elements, guided-mode resonance (GMR) gratings have wide applications in optical communication. However, the transmission spectrum of a conventional GMR grating shows Lorentzian-type response, which limits the further application of GMR gratings in high-performance optical communication systems. Cascaded GMR gratings have been presented to realize flat-top filtering response, but the entire device has a large size and the fabrication process is complicated. In addition, it is difficult to achieve narrow-band flat-top filtering response with only a single-layer compound GMR grating. Hence, a cascaded double-layer compound grating is proposed to solve the problem in this work. The output spectra are analyzed by a combination of rigorous coupled wave analysis and eigenmode analysis, and the results show that the central wavelength of the filter is 1549.9 nm, and the line width of the flat-top spectrum is 0.5 nm.
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Jiuzhou Yu, Xiuhong Liu, Yining Bao, Danping Ren, Jinhua Hu, Jijun Zhao. Design of Narrow-Band Flat-Top Filter Based on Cascaded Compound Gratings[J]. Acta Optica Sinica, 2021, 41(20): 2005001
Category: Diffraction and Gratings
Received: Mar. 15, 2021
Accepted: May. 7, 2021
Published Online: Sep. 30, 2021
The Author Email: Hu Jinhua (hujh84@hebeu.edu.cn)