Improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors

Haiqiang Lai; Jianfei Wang; Xiaobo Tu; Zhou Meng

doi:10.1117/12.2199820

8 October 2015 Improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors

Haiqiang Lai, Jianfei Wang, Xiaobo Tu, Zhou Meng

Proceedings Volume 9679, AOPC 2015: Optical Fiber Sensors and Applications; 96790X (2015) https://doi.org/10.1117/12.2199820
Event: Applied Optics and Photonics China (AOPC2015), 2015, Beijing, China

Abstract

An improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors is demonstrated. This scheme uses two series-connected Acoustic-optic modulators (AOMs) as intensity modulator and frequency shifter respectively. Compared to the traditional optical heterodyne demodulation structure, this scheme eliminates the polarization-induced signal fading and the noise floor is lowered for using the Michelson-configuration delay structure and Faraday rotation mirrors (FRMs) in the optic architecture of system. At the same time, the architecture of this scheme is not complicated and can be used to complex a large sensor array. Experimental results show that the phase noise floor of this demodulation scheme is flat and reaches -99dB/sqrt(Hz) at frequencies above 300 Hz.

Citation Download Citation

Haiqiang Lai, Jianfei Wang, Xiaobo Tu, and Zhou Meng "Improved optical pulse heterodyne demodulation scheme for fiber-optic interferometric sensors", Proc. SPIE 9679, AOPC 2015: Optical Fiber Sensors and Applications, 96790X (8 October 2015); https://doi.org/10.1117/12.2199820

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available