Three-wavelength mode converter based on three-cascaded tilted sampled Bragg gratings

Abstract

By expanding the reconstruction-equivalent-chirp (REC) technique into two-Dimensional (2D) grating, we designed a three-wavelength mode converter with three-cascaded tilted sampled Bragg gratings (3C-TSBG). Theoretical simulation results show that the presented 3C-TSBG can realize three-wavelength conversion between the fundamental transverse electric mode (TE0) and the first-order transverse electric mode (TE1). In addition, the mode-conversion wavelength can be tuned by changing the period and tilted angle of the cascaded sampled gratings. More importantly, compared with the cascaded tilted Bragg gratings (C-TBG), the 3C-TSBG can improved the error tolerance and wavelength control accuracy. Therefore, the proposed 3C-TSBG has potential applications in reconfigurable mode-division-multiplexing communication systems and other areas where programmable mode conversion is required.