Digital demodulation technique for fiber-optic hydrophones based on 3 × 3 couplers

Abstract

In this paper, a digitized real-time demodulation system for optical hydrophones based on a 3 × 3 coupler is proposed. The system is built as a virtual instrument via the dynamic data acquisition platform from NI company. Compared with the commonly used systems composed of analogue circuits, the proposed system has better accuracy and is more flexible in applications. The error analysis of the proposed system is also given.

Keywords

Coupler / Hydrophone / Analogue Circuit / Virtual Instrument / Naval Postgraduate School

References

[1] ShenL., YeX., LiZ.. Semiconductor Optoelectronics, 2001, 22: 105

[2] PriestR. G.. IEEE Transactions on Microwave Theory and Techniques, 1982, 30: 1589

[3] ChenD., XiaoL., CuiJ., LiuT., SunD.. Journal of Optoeletronics Laser, 2007, 18: 523

[4] ZhangY.-b., DouZ., CaoJ.-n.. Journal of Harbin Engineering University, 2004, 25: 732

[5] BrennerD. W.. Design of a Digital Interferometric Demodulator, 1994, Monterey, CA, Naval Postgraduate School

[6] JiangY., LouY., WangH.. Acta Photonica Sinica, 1998, 27: 152

[7] United States Patent 6147930, Available url: http://www.freepatentsonline.com/6147930.html.

[8] ToddM. D., SeaverM., BucholtzF.. Electron. Lett., 2002, 38: 784

[9] NiM., HuY., MengZ.. Laser and Optoelectronics Progress, 2005, 42: 33

[10] ChenY.. Technical Acoustics, 2007, 26: 163

[11] NI, Measurement and Automation Catalog 2006, Available url: http://www.ni.com.

[12] NI, NI 446X Specifications, Available url: http://www.ni.com.