Abstract
In this paper, we describe a 160-Gb/s all-optical 3R regenerator
consisting of a wavelength converter based on self-phase-modulation (SPM)
and a non-linear optical loop mirror (NOLM). Particularly, we focus on the
simple method to improve the performance of dual-stage wavelength
conversion. The dual-stage configuration is useful to alleviate
pulse-to-pulse interaction, which degrades both conversion bandwidth and
regenerative effect. Total conversion performance, however, strongly depends
on waveform distortion at the 1st-stage conversion. Against this, we found
that when setting the wavelength shifts of the 1st -stage: $\Delta \lambda_{1}$ and the 2nd-stage: $\Delta \lambda_{2}$ to be $\Delta \lambda_{1} \Delta \lambda_{2} <
0$, i.e., reversing a wavelength shift at the 2nd-stage, the impact
of waveform distortion was suppressed and the conversion performance was
dramatically improved in comparison with a monotonic shift over both stages $(\Delta \lambda_{1} \Delta \lambda_{2} > 0)$. The physical mechanism proving the benefit of the proposed
conversion scheme is discussed through both numerical simulations and
wavelength conversion experiments. The 3R performance assisted by the
regenerative wavelength converter was evaluated by 160-Gb/s field
transmission experiments which were conducted in the optical test-bed of
Japan Gigabit Network II (JGN II). At a 3R-interval of 380 km, a $Q$-factor improvement of greater than 7 dB was achieved by applying
the wavelength-converter assisted all-optical 3R regenerator.
© 2010 IEEE
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