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Apodized Silicon-on-Insulator Bragg Gratings

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4 Author(s)
Simard, A.D. ; Dept. of Electr. Commun. Eng., Univ. Laval, Montreal, QC, Canada ; Belhadj, N. ; Painchaud, Y. ; LaRochelle, S.

An accurate control of the apodization profile is still an issue for integrated Bragg grating filters fabricated in silicon-on-insulator because of the high modal confinement of these waveguides. In this letter, we present two fabrication-friendly apodization techniques that are compatible with deep UV lithography and can be used in mass-production of photonic-integrated circuits. These techniques are reliable even for weak effective index modulation amplitude, thus opening the door to the fabrication of long and elaborate grating structures.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 12 )