Abstract:
Abstract—Silica planar waveguide echelle grating demultiplexers
with 48 channels and 256 channels are described and
demonstrated. Polarization effects due to stress birefringence and
polarization-dependent grating efficiency have been eliminated
using a modified polarization compensator and grating design.
The devices have a polarization-dependent wavelength shift of
less than 10 pm, and a polarization-dependent loss below 0.2 dB.
The 48-channel device has a measured crosstalk of 35 dB, an
insertion loss better than 4 dB, and a uniformity of 1 dB across
the C-band.
