Underwater acoustic signal acquisition based on optical interferometry in shallow water

Here, it is investigated the results of implementation of interferometric optical fiber acoustic sensor based on fiber Bragg grating (FBG). It is investigated the importance of different types of interferometers configurations as Michelson or Mach-Zehnder interferometers on the signal to noise ratio. It is also considered the role of polymer coating on the increasing of signal to noise ratio. The results show, the Michelson interferometer setup using polymer packaging causes increasing signal to noise ratio. This latter configuration is used in a field setup in shallow water for acoustic signal detection in range of 0.5-5 kHz. The goal of this paper is extracting acoustical signal using optical signal via optical sensors and demodulation methods.Here, it is investigated the results of implementation of interferometric optical fiber acoustic sensor based on fiber Bragg grating (FBG). It is investigated the importance of different types of interferometers configurations as Michelson or Mach-Zehnder interferometers on the signal to noise ratio. It is also considered the role of polymer coating on the increasing of signal to noise ratio. The results show, the Michelson interferometer setup using polymer packaging causes increasing signal to noise ratio. This latter configuration is used in a field setup in shallow water for acoustic signal detection in range of 0.5-5 kHz. The goal of this paper is extracting acoustical signal using optical signal via optical sensors and demodulation methods.