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Development and characterization of a direct detection fiber optic distributed acoustic sensor

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Figure 1.1: Topologies of different kinds of sensors.
Figure 2.2: Cross section and refractive-index profile of a step-index fiber.
Table 3.2: Laser specifications. Linewidth (Hz) <100 RIN level (dBc/Hz) <-107 @peak <-140 @10MHz Short term drift (kHz/min) 127 Long term drift (MHz/20 mins) 4.11
Figure 3.4: a) Booster EDFA output power curve, b) Preamplifier EDFA gain curve.
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