Fabrication of an expanded core fiber having MFD of 40 /spl mu/m preserving outer diameter

Abstract
A thermally-diffused expanded core (TEC) fiber with the mode field diameter (MFD) of 40 /spl mu/m has been fabricated by improving the diffusion process using an electric furnace. The outer diameter of any TEC fiber is preserved and the excess loss (normal-TEC-normal) is as low as 0.1 dB.

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