We report on the effect of the polarization-dependent loss (PDL) on the polarization-shift-keying (PolSK) transmission system. In a PolSK system, the PDL of the fiber-optic link could generate an inband crosstalk and degrade the signal’s extinction ratio. The result shows that a 3-dB PDL could result in the 1-dB power penalty. However, unlike the effect of PMD, it is not dependent on the transmission speed.
We propose and demonstrate a simple and efficient technique to monitor the optical paths in all-optical WDM transport networks using pilot tones. This technique could also monitor the crosstalk increases caused by the partial failures of optical switches in the optical cross-connects. In addition, unlike the other monitoring techniques based on the pilot tones, this technique was insensitive to the cross-gain modulation of EDFA. Thus, the proposed techniques could be used to monitor both the optical paths and switch failures in a large-scale all-optical WDM transport network.
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