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Birefringence suppression of UV-induced refractive index with grooves in silica-based planar lightwave circuits

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4 Author(s)
Y. Nasu ; NTT Photonics Labs., NTT Corp., Atsugi, Japan ; M. Kohtoku ; M. Abe ; Y. Hibino

An effective method for suppressing the birefringence of a UV-induced refractive index change is demonstrated for phase trimming of waveguides in planar lightwave circuits. By employing grooves on both sides of the waveguide to control the UV-induced strain, a significant reduction is achieved from 1.46×10-4 to 0.11×10-4 in the UV-induced birefringence for a π phase shift averaged between the TE and TM modes in a 2 mm-long waveguide.

Published in:

Electronics Letters  (Volume:41 ,  Issue: 20 )