TY - JOUR
T1 - Fast-Light Enhanced Brillouin Laser Based Active Fiber Optic Sensor for Simultaneous Measurement of Rotation and Strain
AU - Zhou, Minchuan
AU - Zhou, Zifan
AU - Fouda, Mohamed
AU - Condon, Nicholas
AU - Scheuer, Jacob
AU - Shahriar, Selim M.
N1 - Publisher Copyright:
© 2017 IEEE.
PY - 2017/12/1
Y1 - 2017/12/1
N2 - We have developed a conceptual design for an active fast light fiber optic sensor (AFLIFOS) that can perform simultaneously or separately as a gyroscope (differential mode effect) and as a sensor for strain and other common mode effects. Two Brillouin lasers in opposite directions and separated in frequency by several free spectral ranges are used for this sensor. By coupling two auxiliary resonators to the primary fiber resonator, we produce superluminal effects for the two laser modes. We develop a detailed theoretical model for optimizing the design of the AFLIFOS, and show that the enhancement factor of the sensitivity is ∼8.2 × 103, under the optimized condition, when the effective change in the length of the primary fiber resonator is 0.1 pm, corresponding to a rotation rate of 1.4 × 10-3 deg/sec. With this enhancement factor, the minimum detectable rotation rate is 2.4 × 10-11 deg/sec when the output power is 1 mW and the measurement time is 1 s, which is ∼ 8.2 × 103 times better than that of the passive version with the same parameters. The minimum measurable strain is 1.4 × 10-2 fϵ√ Hz when 1/4 of the primary resonator is sensitive to strain and the linewidth of the master laser is taken to be 200 Hz. It may be possible to get much higher enhancement by adjusting parameters such as the length of the laser loops and the coupling coefficients.
AB - We have developed a conceptual design for an active fast light fiber optic sensor (AFLIFOS) that can perform simultaneously or separately as a gyroscope (differential mode effect) and as a sensor for strain and other common mode effects. Two Brillouin lasers in opposite directions and separated in frequency by several free spectral ranges are used for this sensor. By coupling two auxiliary resonators to the primary fiber resonator, we produce superluminal effects for the two laser modes. We develop a detailed theoretical model for optimizing the design of the AFLIFOS, and show that the enhancement factor of the sensitivity is ∼8.2 × 103, under the optimized condition, when the effective change in the length of the primary fiber resonator is 0.1 pm, corresponding to a rotation rate of 1.4 × 10-3 deg/sec. With this enhancement factor, the minimum detectable rotation rate is 2.4 × 10-11 deg/sec when the output power is 1 mW and the measurement time is 1 s, which is ∼ 8.2 × 103 times better than that of the passive version with the same parameters. The minimum measurable strain is 1.4 × 10-2 fϵ√ Hz when 1/4 of the primary resonator is sensitive to strain and the linewidth of the master laser is taken to be 200 Hz. It may be possible to get much higher enhancement by adjusting parameters such as the length of the laser loops and the coupling coefficients.
KW - Brillouin scattering
KW - fast light
KW - fiber optics
KW - gyroscopes
UR - http://www.scopus.com/inward/record.url?scp=85032743831&partnerID=8YFLogxK
U2 - 10.1109/JLT.2017.2768898
DO - 10.1109/JLT.2017.2768898
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AN - SCOPUS:85032743831
SN - 0733-8724
VL - 35
SP - 5222
EP - 5229
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 23
M1 - 8093609
ER -