Deep phase modulation interferometry was proposed as a method to enhance homodyne interferometers to work over many fringes. In this scheme, a sinusoidal phase modulation is applied in one arm while the demodulation takes place as a post-processing step. In this contribution we report on the development to implement this scheme in a fiber coupled interferometer controlled by means of a FPGA, which includes a LEON3 soft-core processor. The latter acts as a CPU and executes a custom made application to communicate with a host PC. In contrast to usual FPGA-based designs, this implementation allows a real-time fine tuning of the parameters involved in the setup, from the control to the post-processing parameters.
@article{arxiv.1411.6910,
title = {Towards a FPGA-controlled deep phase modulation interferometer},
author = {M. Terán and V. Martín and L. l. Gesa and I. Mateos and F. Gibert and N. Karnesis and J. Ramos-Castro and T. S. Schwarze and O. Gerberding and G. Heinzel and F. Guzmán and M. Nofrarias},
journal= {arXiv preprint arXiv:1411.6910},
year = {2015}
}
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Proceedings of the X LISA Symposium, Gainesville, May 18-23, 2014