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We fabricated Bi2O3-based photonic crystal fiber having the higher refractive index core. This fiber shows the fusion-spliciability to SiO2 fiber, relatively low loss (1.8 dB/m), high nonlinearity (780 W-1km-1) and small dispersion (-5 ps/nm/km) at 1550 nm.
Self-phase-modulation-induced spectral broadening is observed in an 46 cm-long bismuth-based nonlinear photonic crystal fiber. Numerical consideration of nonlinear pulse propagation verifies that the low dispersion and high nonlinearity are achieved simultaneously.
We demonstrate an all fiber-based OTDM receiver incorporating clock recovery and demultiplexing functions using short lengths of bismuth oxide-based nonlinear fiber and erbium-doped bismuth oxide fiber. Error-free, overall operation is achieved at 80 Gbit/s and the clock recovery is also shown to be operable at 160 Gbit/s.
Multichannel frequency conversion is demonstrated using four-wave mixing. A polarisation independent configuration is employed, by which polarisation control for each signal is not necessary. By setting the pump light frequency at the zero-dispersion wavelength of the fibre, three FSK modulated signals with a frequency spacing of 70 GHz are simultaneously converted with an equal efficiency of -27...
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