Affiliation:
1. SMART Photonics BV
2. Eindhoven Hendrik Casimir Institute, Eindhoven University of Technology
Abstract
We demonstrate narrow-bandwidth, low-kappa, distributed Bragg reflector
(DBR) grating filters on an indium phosphide (InP) generic foundry
platform. With the varying corrugation widths of the DBR grating, we
achieve flexibility in the design of the coupling coefficients from 10
to 50cm−1, which correspond to grating
bandwidths of 0.68 nm to 1.28 nm, respectively. These values are
experimentally observed and agree well with the theoretical analysis.
The DBR grating is based on periodic rectangular grooves in quaternary
material that is placed between the waveguide core and cladding
region. Such configurations of the DBR grating provide a low
propagation loss of ∼2dB/cm near the telecom band around
1550 nm.