Pico-strain multiplexed fiber optic sensor array operating down to infra-sonic frequencies.

An integrated sensor system is presented which displays passive long range operation to 100 km at pico-strain (pepsilon) sensitivity to low frequencies (4 Hz) in wavelength division multiplexed operation with negligible cross-talk (better than -75 dB). This has been achieved by pre-stabilizing and multiplexing all interrogation lasers for the sensor array to a single optical frequency reference. This single frequency reference allows each laser to be locked to an arbitrary wavelength and independently tuned, while maintaining suppression of laser frequency noise. With appropriate packaging, such a multiplexed strain sensing system can form the core of a low frequency accelerometer or hydrophone array.

[1]  David J. Webb,et al.  Fiber laser hydrophone array , 1999, Optics East.

[2]  John L. Hall,et al.  Laser phase and frequency stabilization using an optical resonator , 1983 .

[3]  Rajarshi Roy,et al.  Extracavity laser band-shape and bandwidth modification , 1982 .

[4]  David E McClelland,et al.  Laser frequency-noise-limited ultrahigh resolution remote fiber sensing. , 2006, Optics express.

[5]  Alexei Tikhomirov,et al.  A fiber laser hydrophone , 2005, International Conference on Optical Fibre Sensors.

[6]  David E McClelland,et al.  Demonstration of a passive subpicostrain fiber strain sensor. , 2005, Optics letters.

[7]  K. Wanser,et al.  Fundamental phase noise limit in optical fibres due to temperature fluctuations , 1992 .

[8]  M Tur,et al.  Highly sensitive dynamic strain measurements by locking lasers to fiber Bragg gratings. , 1998, Optics letters.

[9]  J.H. Chow,et al.  Phase-sensitive interrogation of fiber Bragg grating resonators for sensing applications , 2005, Journal of Lightwave Technology.

[10]  Daniel A. Shaddock,et al.  Overview of the LISA Phasemeter , 2006 .

[11]  Erlend Ronnekleiv,et al.  Suppression of Rayleigh Scattering Noise in a TDM Multiplexed Interferometric Sensor System , 2008, OFC/NFOEC 2008 - 2008 Conference on Optical Fiber Communication/National Fiber Optic Engineers Conference.

[12]  A. Bautista,et al.  Large-scale remotely pumped and interrogated fiber-optic interferometric sensor array , 2003, IEEE Photonics Technology Letters.

[13]  Michael A. Davis,et al.  Fiber grating sensors , 1997 .

[14]  C. Greiner,et al.  Laser frequency stabilization by means of optical self-heterodyne beat-frequency control. , 1998, Optics letters.

[15]  Interrogation of a passive fiber Bragg grating resonator sensor by current modulation of a diode laser , 2005, 2005 IEEE LEOS Annual Meeting Conference Proceedings.

[16]  Francesco Marin,et al.  Quantum noise of free-running and externally-stabilized laser diodes , 1995 .