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Low-loss small-mode passive waveguides and near-adiabatic tapers in BK7 glass

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3 Author(s)
H. Zhenguang ; Dept. of Electr. Eng., Florida Univ., Gainesville, FL, USA ; R. Srivastava ; R. V. Ramaswamy

A detailed study of the Ag+-Na+ ion-exchange in BK7 glass and fabrication of low-loss (<0.2 dB/cm at λ0=1.3 μm) single-mode waveguides using this technique are discussed. By postbaking the extremities of small-mode-size straight-surface guides, 5-mm-long near-adiabatic fiber-compatible tapered transitions with total fiber-device insertion losses below 0.8 dB in 16-mm-long devices, including the tapers at both ends, have been demonstrated

Published in:

Journal of Lightwave Technology  (Volume:7 ,  Issue: 10 )