Abstract
We numerically and experimentally demonstrated that 100% driving voltage doesn’t necessarily yield optimal results in optical duobinary systems. LPFs with larger bandwidth require lower driving voltage to be optimized. Compared with conventional condition, a 2.5 dB sensitivity improvement is obtained following 240 km of standard single mode fiber (SSMF) transmission by using 3 GHz LPFs with optimum voltage. In part 2 of this thesis, a fiber Bragg grating (FBG) sensor system using a fiber ring laser with a hybrid amplifier is proposed and demonstrated. The hybrid amplifier comprises an erbium doped waveguide amplifier and a semiconductor optical amplifier. The experiment shows that such the hybrid amplifier has a high amplifier spontaneous emission power and gain spectrum. Moreover, this fiber ring laser can provide a stable multiwavelength output with an optical signal-to-noise ratio over 50 dB even if the FBGs are located at a 25 km remote sensing position.