The unique and practical benefits of the use of bismuth-oxide-based nonlinear fiber (Bi-NLF) in implementing a four-wave-mixing (FWM)-based wavelength converter for fiber-optic-communication-system applications are experimentally demonstrated. First, the Kerr-nonlinearity and stimulated-Brillouin-scattering (SBS) characteristics of our fabricated Bi-NLF are experimentally investigated. The Bi-NLF is found to have the superior advantage of a significantly high SBS threshold in addition to its ultrahigh Kerr nonlinearity \gamma of \sim 1100 W-1 · km-1, compared to the conventional silica-based highly nonlinear fiber. Next, the authors perform an experiment for the FWM-based wavelength conversion of a non-return-to-zero (NRZ) signal within a 40-cm length of the Bi-NLF fusion spliced to standard silica fibers by using a continuous-wave (CW) high-power pump beam. Error-free tunable wavelength conversion over a 10-nm bandwidth is readily achieved. No SBS-suppression scheme is employed for the pump due to the high SBS threshold, which simplifies the system configuration and improves the quality of the wavelength-converted signal.
© 2006 IEEE
Ju Han Lee, Tatsuo Nagashima, Tomoharu Hasegawa, Seiki Ohara, Naoki Sugimoto, and Kazuro Kikuchi, "Bismuth-Oxide-Based Nonlinear Fiber With a High SBS Threshold and Its Application to Four-Wave-Mixing Wavelength Conversion Using a Pure Continuous-Wave Pump," J. Lightwave Technol. 24, 22- (2006)