Abstract
Simultaneous regeneration of four high-speed (160 Gbit/s) wavelength-division multiplexed (WDM) and polarization-division multiplexed (PDM) signals in a single highly nonlinear fiber (HNLF) is demonstrated. The regeneration operation is based on four-wave mixing in HNLF, where the degraded data signals are applied as the pump. As a result, the noise on both '0' and '1' levels can be suppressed simultaneously in our scheme. The stimulated Brillouin scattering (SBS) from the continuous wave (CW) is suppressed by cross-phase modulation (XPM) from the data pump, relieving the requirement of external phase modulation of the CW light. Mitigation of the inter-channel nonlinearities is achieved mainly through an inter-channel 0.5 bit slot time delay. Bidirectional propagation is also applied to relieve the inter-channel four-wave mixing. The multi-channel regeneration performance is validated by bit-error rate (BER) measurements. The receiver powers at the BER of 10(-9) are improved by 1.9 dB, 1.8 dB, 1.6 dB and 1.5 dB for the four data channels, respectively.
Highlights
Optical signals propagating in fiber-optic transmission systems are impaired by various sources, which limit their transmission distance [1]
We demonstrate simultaneous all-optical regeneration for four 160-Gbit/s wavelength-division multiplexed (WDM) and polarization-division multiplexed (PDM) channels, using four-wave mixing (FWM) in a highly nonlinear fiber (HNLF)
We have demonstrated simultaneous all-optical regeneration for 4 × 160-Gbit/s WDM and PDM channels based on FWM in a single HNLF
Summary
Optical signals propagating in fiber-optic transmission systems are impaired by various sources, which limit their transmission distance [1]. As most transmission today is based on multi-channels systems, it would be beneficial if such a high speed optical regenerator could deal with multi-channel signals, but this has so far proven difficult, because of detrimental inter-channel cross-talk due to effects such as XPM, cross gain modulation (XGM) and four-wave mixing (FWM). If orthogonal polarizations are used, four-channel regeneration can be achieved, where inter-channel nonlinearities are avoided in time by using data signals with very short pulse duration (e.g. duty cycle is much less 50%) [4]. In [5], alloptical 3R regeneration for 4 × 40-Gbit/s WDM channels in a dispersion-shifted fiber (DSF) was demonstrated. This scheme can process data signals with practical pulse duration (e.g. 33% or 50% duty cycle) by utilizing an inter-channel 0.5 bit slot time delay.
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