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In this paper, an ultra-long distance transmission fiber link based on bidirectional Raman amplifier is studied by theoretical simulation and experimental verification. The power evolution of pump and WDM signals in optical fiber in 355 km transmission link is simulated theoretically. The performance of the ultra-long distance system based on co-pump/counter-pump/bidirectional-pump Raman amplifier (CORA/CTRA/BiRA) are simulated. And the power budget is also predicted by simulation. The performance of 10*100 Gb/s signal transmission in 355 km fiber link based on bidirectional Raman amplifier are tested experimentally. The theoretical and experimental results are in good agreement.

A novel intensity-based optical fiber liquid-level sensor based on a sensitive and extrinsic Fabry-Perot (F-P) interferometric cavity is described in this paper. The novel sensing schemes combines the advantages of both interferometry sensors and intensity-based sensors. The sensor operates on a single fiber F-P interferometric cavity with a DFB-LD light source. The elastic silicon slice replaces conventional reflected multimode optical fiber in extrinsic optical fiber F-P sensor as sensing element. Several steps have been taken to eliminate or restrain temperature effect influencing on the sensing system. Experimental results indicate a precision as high as 1.2mm of a full scale 3.5m (water) is obtained.The optimized sensor can be used in explosive and flammable environment to measure liquid-level continuously and accurately.

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