1. Polarization-Insensitive and Tunable Silicon Mach–Zehnder Wavelength Filters With Flat Transmission Passband
- Author
-
Xiuling Deng, Xia Feng, Bin Luo, Hengyun Jiang, Wei Pan, and Lianshan Yan
- Subjects
Materials science ,business.industry ,Bandwidth (signal processing) ,02 engineering and technology ,Mach–Zehnder interferometer ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Wavelength ,020210 optoelectronics & photonics ,0103 physical sciences ,0202 electrical engineering, electronic engineering, information engineering ,Optoelectronics ,Insertion loss ,Power dividers and directional couplers ,Electrical and Electronic Engineering ,business ,Optical filter ,Passband ,Free spectral range - Abstract
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.
- Published
- 2018