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Opt Lett. 2005 Aug 1;30(15):1923-5.

Demonstration of a passive subpicostrain fiber strain sensor.

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  • 1Centre for Gravitational Physics, Faculty of Science, The Australian National University, Canberra, ACT 0200, Australia.


We demonstrate a fiber Fabry-Perot (FFP) sensor that is capable of detecting subpicostrain signals, from 100 Hz and extending beyond 100 kHz, using the Pound-Drever-Hall (PDH) frequency locking technique. A low-power diode laser at 1550 nm is locked to a free-space reference cavity to suppress its free-running frequency noise, thereby stabilizing the laser. The stabilized laser is then used to interrogate a FFP sensor whose PDH error signal yields the instantaneous fiber strain.

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