Polarization-insensitive antisymmetric multimode waveguide Bragg grating filter based on an SiN–Si dual-layer stack

Abstract

A polarization-insensitive multimode antisymmetric waveguide Bragg grating (MASWBG) filter based on an SiN–Si dual-layer stack is demonstrated. Carefully optimized grating corrugations patterned on the sidewall of a silicon waveguide and SiN overlay are used to perturbate TE and TM modes, respectively. Furthermore, the lateral-shift apodization technique is utilized to improve the sidelobe suppression ratio (SLSR). A good overlap between the passbands measured in TE and TM polarization states is obtained. Insertion losses, SLSRs, and 3-dB bandwidths of measured passbands in TE/TM polarizations are 1/1.72 dB, 18.5/19.1 dB, and 5.1/3.5 nm, respectively.

Ultra-Broadband Optical Filter Based on step-chirped Multimode Waveguide Bragg Grating

“…Meanwhile, silicon photonics has emerged as a potential optical interconnection technology due to its low cost, high integration and compatibility with complementary metal oxide semiconductor (CMOS) process. Various compact silicon photonic integrated devices have been successfully developed, including active components such as Si/Ge photodetectors [2][3][4], Si/Ⅲ-Ⅴ lasers [5,6], and siliconbased modulators [7][8][9], as well as passive devices such as silicon optical filters [10,11] and mode multiplexers [12]. Silicon optical filters have been well studied as key devices in wavelength division multiplexing (WDM) systems.…”

“…Considerable efforts have been devoted to the development of optical filters on silicon-on-insulator (SOI) platform. Common methods used to realize silicon photonic filters are micro-ring resonator (MRRs) [13], cascaded Mach-Zehnder interferometer (MZI) lattice filter [14,15], arrayed waveguide gratings (AWGs) [16][17][18], planar concave gratings (EDGs) [18], and Bragg grating filter [10,11,19], etc. However, MRR-based optical filter suffers from narrow passband and requires active thermal control to correct the wavelength shift.…”

Comparison of silicon AWGs-based O-band 1×8 (de)multiplexers

“…Wavelength division multiplexing (WDM) technology is the key technology for optical communication systems which is widely used in various optical interconnect scenarios to increase the data transmission capacity of single fiber, plenty of efforts have been devoted to develop WDM filters on silicon-oninsulator (SOI) platform. Commonly used silicon (de-)multiplexing filters include micro-ring resonators (MRRs) [10][11][12], arrayed waveguide gratings (AWGs) [13,14], planar concave gratings (PCGs) [15], and cascaded Mach-Zehnder interferometer (MZI) lattice filters [16,17], and waveguide Bragg gratings (WBGs) [18,19]. These schemes have their own advantages and disadvantages and need to be selected based on specific application scenarios.…”

Design and analysis of a compact and broadband polarization beam splitter on silicon nitride on silicon-on-insulator multilayer platform using a partially overlapped vertical asymmetrical directional coupler

“…On this platform, the devices or circuits fabricated in SiN and Si layers can work in many complementary ways due to the different material properties, thus offering much more functional flexibility with higher integration density 16 , 17 . Devices, such as interlayer coupler, 18 grating coupler, 19 polarization handling devices, 20 – 23 optical switches, 24 or Bragg grating filter, 25 have been demonstrated on this platform. Different from the planar DC scheme, there exists extra freedom of the relative location between SiN and Si waveguides in the vertical ADC structure, which could break its horizontal and vertical symmetries simultaneously.…”