Jbd. Soole et al., TOLERANCE OF INP POLARIZATION-INDEPENDENT ARRAYED-WAVE-GUIDE FILTERS USING SQUARE WAVE-GUIDE CORES, Electronics Letters, 33(7), 1997, pp. 579-580
Polarisation-independent arrayed waveguide filters using square wavegu
ide cores are shown to be highly tolerant to variations in fabrication
. Low birefringence and wavelength shifts are observed in devices fabr
icated in several different process runs.