Abstract
The main source of light transmission loss between single-mode fiber (SMF) and large mode area (LMA) fiber is from the mode field mismatch. Thermally expanded core (TEC) technique was introduced to realize mode field adaptation between them. The SMF was heated by a H2–O2 flame to increase the mode field diameter (MFD) which can result in a mode field match with LMA. Both numerical calculation and experiment results show it is workable to realize mode field adaptation and get a low transmission loss by this method. For HI1060 (d=5μm, NA=0.14) and LMA-GDF-15/130(d=15μm, NA=0.08), a low-loss with 0.4dB was obtained for SMF–LMA–SMF from 6.4dB with TEC processing experimentally.
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