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Opt Lett. 2005 Apr 1;30(7):723-5.

Low-loss waveguides written with a femtosecond laser for flexible interconnection in a planar light-wave circuit.

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NTT Photonics Laboratories, NTT Corporation, 3-1 Morinosato Wakamiya, Atsugi-Shi, Kanagawa Prefecture, 243-0198, Japan.


We describe a low-loss single-mode waveguide in planar light-wave circuit (PLC) glass doped with boron and phosphorus, which is more difficult to write than pure-silica glass. The written waveguide has a rectangular core, a symmetric near-field pattern, and a propagation loss of 0.35 dB/cm. The loss that originates from the mode-field mismatch between the mode-field diameters of the written and the PLC waveguides is less than 0.1 dB/point. In addition, we successfully connected PLC waveguides with a 500-microm-long waveguide written with a laser. The laser-written waveguide can flexibly connect PLC waveguides with a low coupling loss.

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