Abstract
We report on the experimental assessment of an all-optical clock-recovery scheme at 40-Gb/s cascading a
polarization-insensitive bulk-based self-pulsating (SP) laser and a high spectral purity quantum-dots-based SP
laser. It is demonstrated experimentally that such a clock-recovery scheme is polarization insensitive, efficient in
the jitter filtering, and tolerant for an input optical signal-to-noise ratio (OSNR) as low as 15 dB/0.1 nm. It is
shown theoretically that the jitter-filtering function of the cascade is the product of the transfer functions of
both lasers. The contributions of the phase noise of these two lasers to the final jitter are also identified and
quantified. The influence of the degradation of the OSNR to the total timing jitter is also analyzed. The approach
proposed in this paper offers the real opportunity to realize an all-optical clock recovery with a performance
compatible for system applications.
© 2007 IEEE
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