All-Optical 160-Gb/s Phase Reconstructing Wavelength Conversion Using Cross-Phase Modulation (XPM) in Dispersion-Shifted Fiber

Optical Wavelength Conversion by Cross-Phase Modulation of Data Signals up to 640 Gb/s

“…These peaks are much more pronounced after the wavelength conversion as the converted signal has adopted the phase properties of the CW probe signal, giving a stable phase relationship between consecutive pulses in the wavelength-converted OTDM data signal [8]. In the original data signal, the modulation peaks are unstable and much less pronounced, since there is no stable phase relationship between consecutive pulses in the multiplexed OTDM data signal.…”

Raman-Assisted XPM Wavelength Conversion at 320 Gb/s

“…The 320 GHz spectral components from the pulsed nature of the signal are not clearly visible in the original data, as the multiplexed signal is not phase stabilised. The 320 GHz peaks are clearly visible in the converted signal as this signal, though, has adopted the phase of the CW probe so no phase mismatch occurs between pulses [7]. Figure 3 shows the spectrum at the output of the HNLF before any filtering is performed.…”

640 Gbit/s wavelength conversion

“…At the output of the HNLF one of these sidebands is extracted by optical filtering to form the wavelength converted output signal at ~1539 nm. 640 GHz spectral components are clearly visible after conversion, as the wavelength converted signal has adopted the phase properties of the CW probe signal, giving a stable phase relationship between consecutive pulses in the wavelength converted OTDM data signal [4]. Figure 2, right shows BER results for the 640 Gbit/s original data signal and for the wavelength converted signal when demultiplexed down to 10 Gbit/s.…”