Analysis of Subpulse Generation from Delayed-Interference Signal-Wavelength Converter for Wide Carrier Recovery Rate Range

概要

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The generation of subpulses in delayed-interference signal-wavelength converters (DISCs) had been suspected as a cause of waveform degradation in their application in ultrafast (${\sim}160$ GHz) optical time division multiplexing (OTDM) communication systems. We reported its first observation in our previous letter. In this paper, after a detailed explanation of our model, experimental method and improved results with respect to those in the previous letter, we discussed the applicability of our model in a wide range of carrier recovery rates in the semiconductor optical amplifier (SOA). Subpulse waveforms were systematically measured for several carrier recovery rates (carrier lifetimes $\tau_{\text{eff}}=11--280$ ps), and an increase in subpulse intensity with recovery rate was observed. The calculated intensities showed good agreement with measured data for most recovery rates, which supports our model. Using this model, we numerically showed the trade-off between subpulses and pattern-induced intensity noise, in the same recovery rate range. This trade-off suggests that part of the DISC structure needs improvement.
2008-09-25