Low-loss and large-tolerance fiber coupling of high- Delta silica waveguides by local mode-field conversion
- 1 April 1993
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 5 (4) , 433-435
- https://doi.org/10.1109/68.212690
Abstract
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.Keywords
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