Low-Penalty Band-Switchable Multi-Band Optical Cross-Connect Using PPLN-Based Inter-Band Wavelength Converters

In multi-band optical networks, a band-switchable cross-connect (MB-OXC), which enables not only the output port but also wavelength band of input signals to be switched, can significantly increase accommodated traffic volume. An all-optical inter-band converter (AO-WC) is key device achieve MB-OXC and required have little signal degradation even when pass through it many times. this paper, we propose low-penalty using AO-WCs with periodically poled lithium niobate (PPLN) waveguides. The PPLN-based AO-WC high conversion efficiency (∼10 dB) low noise figure (∼5 for wavelength-band between entire C-band L-band over 4.8 THz. addition, experimentally evaluate quality 96-channel 32-Gbaud DP-16QAM WDM by AO-WCs. By optimizing power AO-WC, shown that improve volume achieved after > 20 conversions. These results confirm physical-layer feasibility