Multifunctional Optical Filter Using Direct-Coupled and Cross-Coupled All-Pass Filters

Author

Dingel, Benjamin

Author_Institution

Nasfine Photonics Inc., Painted Post, NY, USA

Volume

26

Issue

8

fYear

2014

fDate

15-Apr-14

Firstpage

785

Lastpage

788

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;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2014.2306394

Filename

6740853