Deep-notch, ultracompact long-period grating in a large-mode-area photonic crystal fiber.

  title={Deep-notch, ultracompact long-period grating in a large-mode-area photonic crystal fiber.},
  author={Yinian Zhu and Ping Shum and Joo-Hin Chong and M. Krishna Chennakesava Rao and Chao Lu},
  journal={Optics letters},
  volume={28 24},
An extremely short long-period grating (LPG) with strong resonance has been developed in a large-mode-area photonic crystal fiber (PCF) by use of the heat source of a CO2 laser. We believe that such a LPG in pure silica PCF is the first example to be obtained with the point-by-point technique. The fabrication method is simple and repeatable. The resulting LPG has 8 periods, written by a CO2 laser, within a 2.8-mm length of fiber, which yields a deep notch of core-cladding mode coupling of -31.5… CONTINUE READING
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