Low-loss photonic crystal fibers for transmission systems and their   dispersion properties
  We report on a single-mode photonic crystal fiber with attenuation and effective area at 1550 nm of 0.48 dB/km and 130 square-micron, respectively. This is, to our knowledge, the lowest loss reported for a PCF not made from VAD prepared silica and at the same time the largest effective area for a low-loss (< 1 dB/km) PCF. We briefly discuss the future applications of PCFs for data transmission and show for the first time, both numerically and experimentally, how the group velocity dispersion is related to the mode field diameter 
M.D. Nielsen, C. Jacobsen, N.A. Mortensen, J.R. Folkenberg, and H.R.   Simonsen