Abstract
An intracavity absorption gas sensor based on fiber ring laser using
erbium-doped fiber (EDF) as the gain media was proposed in this paper. A theoretical
model for analyzing the effects of the EDF and the system parameters on the
performance of this gas sensor was established using coupled rate equations
and propagation equations. The system performances of various parameters were
simulated and compared. Relations between optimal parameters and desirable
performances were found. We also investigated a number of specific cases and
suggested practical choices of their parameters. Experiments with two cavity
losses were conducted to test the system sensitivity enhancement and the SNR.
The general trends of experimental results agreed with the theoretical prediction
and sensitivity enhancement factors of 50–65 were achieved, showing
the ability to realize trace gas detection.
© 2011 IEEE
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