Single-Mode Photonic Crystal Fiber Design With Ultralarge Effective Area and Low Bending Loss for Ultrahigh-Speed WDM Transmission

We propose a new photonic crystal fiber design with a W-shaped effective index profile to achieve the largest effective area ( A eff ) for telecommunication use. We realized a 220-μ m 2 A eff while achieving both a cable cutoff wavelength of less than 1300 nm and a bending loss compatible with ITU-T recommendations G.655 and G. 656.