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Low-loss and large-tolerance fiber coupling of high- Delta silica waveguides by local mode-field conversion

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3 Author(s)
Yanagisawa, Masahiro ; NTT Opto-Electron. Lab., Ibaraki, Japan ; Yamada, Y. ; Kobayashi, M.

Small mode-field silica waveguides with a high refractive index difference of 2% that were efficiently coupled to optical fiber using a local mode-field conversion technique are described. The waveguide end was heated locally at 1300 degrees C for 10 h and this had the effect of doubling the mode-field diameter from 5.0 mu m to about 10 mu m with a taper length of 8 mm. It is shown that, as a result, the fiber coupling loss was drastically reduced from 2.4 to 0.1 dB and the alignment tolerance was doubled.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:5 ,  Issue: 4 )