Polarization-Insensitive and Tunable Silicon Mach-Zehnder Wavelength Filters With Flat Transmission Passband

In this paper, an integrated polarization-insensitive optical comb filter with flat passband and tunable central wavelength is designed based on cascaded Mach-Zehnder structure. It is realized by employing three specific directional couplers with square waveguides. The central wavelength of the prop...

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Bibliographic Details
Published in:IEEE photonics journal 2018-06, Vol.10 (3), p.1-7
Main Authors: Deng, Xiuling, Yan, Lianshan, Jiang, Hengyun, Feng, Xia, Pan, Wei, Luo, Bin
Format: Article
Language:English
Subjects:
Filtering theory
Information filters
Optical filters
Optical waveguides
Polarization insensitivity
Resonator filters
Silicon
silicon photonics
wavelength filtering
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Summary:In this paper, an integrated polarization-insensitive optical comb filter with flat passband and tunable central wavelength is designed based on cascaded Mach-Zehnder structure. It is realized by employing three specific directional couplers with square waveguides. The central wavelength of the proposed filter for both TE and TM modes can be equally shifted. Simulation results show that the designed filter has a 3-dB bandwidth of 2.8 nm, a free spectral range of 6.09 nm, and a minimum insertion loss of 0.315 and 0.325 dB for TE and TM mode, respectively. Moreover, the polarization-dependent loss is ~0.05 dB over the passband.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2018.2829542