1997
DOI: 10.1049/ip-opt:19971344
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Analysis of fibre optic Michelson interferometric sensor distortion caused by the imperfect properties of its 3 × 3 coupler

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Cited by 11 publications
(5 citation statements)
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“…A PZT (piezoelectric ceramic transformer) in the sensing arm is used as a signal generator. FRM (Faraday rotator mirror) devices are used to eliminate polarization-induced signal fading [11]. The optical circulator can be also replaced by a 2 × 2 coupler.…”
Section: Demodulation Methodsmentioning
confidence: 99%
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“…A PZT (piezoelectric ceramic transformer) in the sensing arm is used as a signal generator. FRM (Faraday rotator mirror) devices are used to eliminate polarization-induced signal fading [11]. The optical circulator can be also replaced by a 2 × 2 coupler.…”
Section: Demodulation Methodsmentioning
confidence: 99%
“…The optical circulator can be also replaced by a 2 × 2 coupler. The three outputs of the polarization insensitive fiber optic Michelson interferometric sensor using a 3 × 3 coupler are well known as [11] ⎧ ⎨…”
Section: Demodulation Methodsmentioning
confidence: 99%
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“…Since the length difference is much smaller than the coherent length of the light source, the phase noise caused by the length difference can be ignored [17]. The Faraday Rotating Mirror (FRM, Flyboer Technology) with a pigtail is spliced to the sensing fiber by fusion and used to avoid polarization fading [18].…”
Section: A System Configurationmentioning
confidence: 99%
“…In signal processing, interference signals from the 3 × 3 coupler with fixed phase shifts are vital for the accurate phase demodulation. With perfect design of a 3 × 3 coupler, including no power loss, no polarization state change, and equal split ratio, phase difference between two arbitrary outputs of the 3 × 3 coupler is 120°theoretically [15] . However, in practice, the actual condition of power loss, the split ratio and the polarization state in 3 × 3 coupler could not be perfect, so the phase shifts are not a constant of 120°, but contaminated by a phase deviation comprising a quasi-constant phase offset determined by split ratio and phase fluctuation related to polarization variation.…”
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confidence: 99%