We present a novel FBG moisture sensor system using a SOA-based fiber laser with two FBG sensors as resonator mirrors. Two FBG sensors have same temperature coefficient and one of FBGs is coated by polyamide resin film as moisture sensing material. This system is insensitive to temperature changes and the output power of the system is only dependent on the moisture level to be monitored. The operation principle of the system is introduced and the initial experimental results are demonstrated.
An analytical model for evaluating the performances of PMD-supported dual-channel, direct-detection optical PolSK transmission systems with a simple-structure, pre-amplified receiver is presented. The BER in each channel and an average BER of the system are evaluated based on the calculations of the noise probability density functions by using the Karhunen-Loève expansion and moment generating function. The PMD effects in the fiber link are taken into account. Based on the proposed model, the calculated results for evaluating performances of the PolSK system are presented.
ABSRTRACTIn this paper, we present the si mulation results on the investigation of the impacts of PMD on the PolSK optical transmission system. The model used for this study is a dual-channel, direct-detection PolSK optical transmission system with improved receiver architecture. The quality Q fact or of system is use d as a parameter to eval uate quantitatively PMD effects on the performances of this dual-channel PolSK system. The simulation results show that the PMD severely impairs the transmission performances of the PoLSK system and resultantly limits the bit rate. The results also show that with PMD compensation, the performances of the PolSK system can be effectively improved and the bit rate increases greatly from 6 Gb/s to 22 Gb/s.
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