A small fiber optic hydrophone (FOH) system has been constructed, assembled and tested in field trials. This report describes the four element system and results obtained from measurements using the cable. The FOH elements were characterized and the response for all hydrophones was found to agree very well with that expected and was similar for the four FOHs. We measured an approximate sensitivity of 0.2 rad/Pa in the frequency range 420 Hz to 20 kHz. It is concluded that it is relatively easy to manufacture hydroacoustic sensors in a reproducible way. The phase response was not measured. Passive demodulation using 3x3 couplers was used to demodulate the acoustic signals and some technical problems inherent to the method were identified and are discussed. The system noise floor was measured and found to be comparable to the required acoustic detection level in the region of the sea state zero. The concept of a small scale array which does not involve optical multiplexing is discussed and compared to a multiplexed system. Several advantages of such a system justifies its use, e.g. low channel to channel crosstalk, high sensitivity and high dynamic range, although in particular applications a multiplexed architecture should be preferable essentially due to a reduced cost of the hydrophone array with a reduced number of fiber leads.