23 February 2009 Improved symmetric signal demodulating technique for DFB laser hydrophone
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The disadvantage of the symmetric signal demodulating method for DFB laser hydrophone is showed. Because of the different transmission coefficients of the three signal channels, the symmetric condition is dissatisfied. A model with three unsymmetrical interferometric signals is simulated. The simulated result shows that the output signal's amplitude is modulated. In order to correct the unsymmetrical coefficients, PGC (phase generated carrier) technique is introduced to the signal demodulating scheme. The experimental result shows that the PGC technique can improve the signal's symmetry and the output signal's amplitude-modulated problem does not appear obviously.
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Rizhong Li, Junbin Huang, Hongcan Gu, Bo Tan, "Improved symmetric signal demodulating technique for DFB laser hydrophone", Proc. SPIE 7278, Photonics and Optoelectronics Meetings (POEM) 2008: Fiber Optic Communication and Sensors, 72780B (23 February 2009); doi: 10.1117/12.816550; https://doi.org/10.1117/12.816550

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