Title :
Multifunctional Optical Filter Using Direct-Coupled and Cross-Coupled All-Pass Filters
Author :
Dingel, Benjamin
Author_Institution :
Nasfine Photonics Inc., Painted Post, NY, USA
Abstract :
We present a multifunction optical filter that operate as: 1) symmetric interleaver (SI); 2) asymmetric interleaver (AI); 3) dual-wavelength, channel passing add-drop filter (ADF); and 4) dual-wavelength, channel dropping ADF. The new filter is a pair of direct-coupled all-pass-filter (APF) and cross-coupled APF positioned in each of the two arms of a Mach-Zehnder interferometer (MZI). Depending on the MZI´s path length difference and the values of the coupler´s coefficients, these four functions are demonstrated. The interleaver has a superior flat-top profile, low ripple value ( -0.095 dB for SI, -0.075 dB for AI), and high extinction ratio . The effect on waveguide losses on flat-top, ripple, slope, and SNR are also investigated.
Keywords :
Mach-Zehnder interferometers; all-pass filters; optical couplers; optical losses; optical waveguide filters; optical waveguides; MZI path length; Mach-Zehnder interferometer; SNR; asymmetric interleaver; coupler coefficients; cross-coupled all-pass filters; direct-coupled all-pass filters; dual-wavelength channel dropping ADF; dual-wavelength channel passing add-drop filter; extinction ratio; multifunctional optical filter; symmetric interleaver; waveguide losses; Artificial intelligence; Optical fiber filters; Optical fibers; Optical ring resonators; Silicon; All-pass filter (APF); cross-coupled APF; direct-coupled APF; multifunction optical filter; optical interleaver; photonics integrated circuits;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2014.2306394
