Abstract
We explore the potential of the nonlinear amplifying loop mirror (NALM)-based phase-preserving 2R (reamplification and reshaping) regenerator for simultaneous regeneration of multiple wavelength-division-multiplexed (WDM) channels. While not considering nonlinear multi-channel propagation, we address two issues of the phase-preserving NALM that appear to us as the major obstacles in adopting it for realistic WDM applications: a high operating power and a detrimental effect of non-small (33% - 50%) pulse duty cycles. After thorough optimization, we find a new operating regime of this regenerator with the non-small duty-cycle capability and approximately an order of magnitude reduction of the required operating power. In addition, we show that the plateau in the input-output power transfer curve does not automatically lead to the reduction of the amplitude jitter, which is particularly noticeable for the non-small duty-cycle pulses.
Highlights
Growing popularity of the phase-encoded modulation formats in long-haul transmission systems has lead to the need for development of all-optical regenerators capable of processing these formats
We explore the potential of the nonlinear amplifying loop mirror (NALM)-based phase-preserving 2R regenerator for simultaneous regeneration of multiple wavelengthdivision-multiplexed (WDM) channels
We show that the plateau in the input–output power transfer curve does not automatically lead to the reduction of the amplitude jitter, which is noticeable for the non-small duty-cycle pulses
Summary
Growing popularity of the phase-encoded modulation formats (e.g. differential phase-shift keying, or DPSK, and differential quadrature-shift keying, or DQSK) in long-haul transmission systems has lead to the need for development of all-optical regenerators capable of processing these formats. A number of such phase-preserving amplitude regenerator schemes have been recently proposed and demonstrated [4]–[8] To make these regenerators practically useful, one needs to adapt them to wavelength-division multiplexing (WDM) operation, where many WDM channels are processed by a single regenerator. Such an adaptation is fundamentally impossible for schemes [6]–[8] relying on gain saturation, but feasible, at least in principle, for the scheme [4, 5] based on self-phase modulation in a nonlinear amplifying loop mirror (NALM).
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