An improved fixed phased demodulation method combined with phase generated carrier (PGC) and ellipse fitting algorithm

Feng Peng; Lu Hou; Jun Yang; Yonggui Yuan; Chuang Li; Dekai Yan; Libo Yuan; Hui Zheng; Zheng Chang; Kun Ma; Jiyong Yang

doi:10.1117/12.2190842

10 August 2015 An improved fixed phased demodulation method combined with phase generated carrier (PGC) and ellipse fitting algorithm

Feng Peng, Lu Hou, Jun Yang, Yonggui Yuan, Chuang Li, Dekai Yan, Libo Yuan, Hui Zheng, Zheng Chang, Kun Ma, Jiyong Yang

Author Affiliations +

Proceedings Volume 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications; 96200S (2015) https://doi.org/10.1117/12.2190842
Event: International Conference on Optical Instruments and Technology 2015, 2015, Beijing, China

Abstract

In this paper, we present an improved fixed phased demodulation method combined with phase generated carrier (PGC) and ellipse fitting algorithm (EFA) to enhance the phase resolution and suppress the total harmonic distortion (THD) caused by the laser intensity disturbance (LID) of modulation phase. We make the subtraction operation to the outputs of the two 1×2 couplers to get the differential signals without DC offset, which is used to achieve the fixed phase demodulation. The EFA is applied to construct the standard quadrature signals with the two signals. The last output is utilized to finish the small amplitude (<2π rad) demodulation in PGC method, which can increase the phase resolution. The distortion signals caused by the LID effect can be eliminated by the EFA. According to the result, the phase error of the EFA is 0.03rad, the amplitude error is 5% and the phase resolution of system is 2.0×10^-6rad/√Hz@1kHz (-106.3dB) with the THD is 5%.

Citation Download Citation

Feng Peng, Lu Hou, Jun Yang, Yonggui Yuan, Chuang Li, Dekai Yan, Libo Yuan, Hui Zheng, Zheng Chang, Kun Ma, and Jiyong Yang "An improved fixed phased demodulation method combined with phase generated carrier (PGC) and ellipse fitting algorithm", Proc. SPIE 9620, 2015 International Conference on Optical Instruments and Technology: Optical Sensors and Applications, 96200S (10 August 2015); https://doi.org/10.1117/12.2190842

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