Abstract
A narrow-band add-drop filter based on an anti-symmetric cladding-modulated multimode Bragg grating (CMMBG) is demonstrated on the silicon-on-insulator (SOI) platform. The CMMBG is implemented by using periodic placements of silicon cubes along a multimode waveguide. The coupling strength is varied by changing the distance between the cubes and the multimode waveguide. An unlimited free-spectral range (FSR) and weak coupling strengths for TE0–TE1 modes conversion are achieved. Sidewall-misalignment-modulation (SMM) apodization is applied to achieve a high sidelobe suppression ratio (SLSR). The experimental results show that the designed filtering device has a 3-dB bandwidth of 0.8 nm, an insertion loss of −0.65 dB and a SLSR of 20.3 dB. The devices with different grating duty cycles and multimode waveguide widths were also fabricated and analyzed. Our devices are promising for on-chip applications that require narrow bandwidths such as WDM channel filters.
© 2019 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription