Dynamic Range Extension for Heterodyne Fiber-Optic Hydrophone by Using
Instantaneous Frequency-Tracking Method
This letter proposes an instantaneous frequency tracking method to
extend the dynamic range for heterodyne fiber optic hydrophones (FOHs).
They are used directly to compensate for large signal amplitudes. The
working principle is discussed, and simulations are conducted. The
simulations achieve at least 20 dB dynamic range improvement.