Based Optical Waveguide Switch For Fiber Optic Hydrophone To Listen To Time-division Multiplexing

In this paper, the structure of the optical fiber hydrophone time division multiplexing(TDM) array is discussed, and a novel TDM method using an 1 X N optical switch to distribute optical power is proposed . This method has an advantage in improving the optical power efficiency and simplifying the system structure .The performance of the optical switch testing is carried out, and its work mechanism is analyzed.An optical fiber hydrophone TDM system employing an 1 X 4 optical switch has been constructed .To meet the need of high speed and high voltage working condition of the optical switch, the special optical switch drive circuit is designed .The detection and data collection of high frequency rectangle signal are realized .The debugging result of the multiplexing system show that the system is able to realize the multiplexing of the optical fiber hydrophone.The crosstalk among the channels of the TDM system and the system noise are measured .The measure result of the crosstalk is agree with the data under the static voltage condition and the principle of the optical switch. The measure result of the system noise show that the optical fiber hydrophone TDM system would not bring obvious noise under the current level of the detector's noise.