Suppression of double Rayleigh scattering-induced excess noise in remotely interrogated fiber-optic interferometric sensors

This letter describes experimental observations of excess noise due to coherent double Rayleigh scattering in the input fiber of a remotely interrogated fiber-optic interferometric sensor. This noise source is generally only observable when a high coherence length laser is used to interrogate the se...

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Bibliographic Details
Published in:IEEE photonics technology letters 2003-11, Vol.15 (11), p.1582-1584
Main Authors: Cranch, G.A., Dandridge, A., Kirkendall, C.K.
Format: Article
Language:English
Subjects:
Coherence
Fiber lasers
Fiber optics
Fibers
Frequency
Joining processes
Laser modes
Laser noise
Lasers
Mathematical models
Modulation
Noise
Noise reduction
Optical fiber sensors
Optical fibers
Rayleigh scattering
Sensor phenomena and characterization
Sensors
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Summary:This letter describes experimental observations of excess noise due to coherent double Rayleigh scattering in the input fiber of a remotely interrogated fiber-optic interferometric sensor. This noise source is generally only observable when a high coherence length laser is used to interrogate the sensor and the fiber length connecting the sensor is in excess of /spl sim/10 km. We present a simplified model to explain how this noise source affects the sensor resolution and demonstrate a method based on laser source modulation to reduce this noise by /spl sim/20 dB in a fiber-optic Michelson interferometric sensor with a 25-km input fiber, at frequencies less than 10 kHz.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2003.818626