64-element time-division multiplexed interferometric sensor array with EDFA telemetry

Kersey, Alan D.; Dandridge, A.; Davis, Allen; Kirdendall, C.K.; Marrone, M. J.; Gross, Dirk-Daniel

doi:10.1109/ofc.1996.908285

Cited by 17 publications

(11 citation statements)

References 6 publications

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“…9 The forward-coupled array topology is preferred to the normal ladder array configuration, as the forward-coupled array is more tolerant of the coupling ratios of the couplers required for balancing the sensor performance. 12 It is assumed that the optical path differences between adjacent channels are the same. ⌬T is the time-delay difference between adjacent sensors, and N is the number of sensor channels.…”

Section: Introductionmentioning

confidence: 99%

Performance analysis of a time-division-multiplexed fiber-optic gas-sensor array by wavelength modulation of a distributed-feedback laser

Jin

1999

Appl. Opt.

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The results of an investigation of the performance of a time-division-addressed fiber-optic gas-sensor array by means of wavelength modulation of a distributed-feedback ͑DFB͒ laser are reported. The system performance is found to be severely limited by the extinction ratio of the optical switch used for pulse amplitude modulation. Formulas that relate the cross-talk level to the extinction ratio of the switch, the modulation parameters of the DFB laser, and the optical path differences among sensing channels are derived. Computer simulation shows that an array of 20 methane gas sensors with a detection sensitivity of 2000 parts in 10 6 ͑ppm͒ ͑10-cm gas cell͒ for each sensor may be realized with a commercially available single Mach-Zehnder amplitude modulator ͑Ϫ35-dB extinction ratio͒. An array of 100 sensors with a 100-ppm detection sensitivity for each sensor may be realized if a double MachZehnder amplitude modulator is used.

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Section: Introductionmentioning

confidence: 99%

Performance analysis of a time-division-multiplexed fiber-optic gas-sensor array by wavelength modulation of a distributed-feedback laser

Jin

1999

Appl. Opt.

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“…(11) a(VL0 + VL,,, Sfl w(t -iLT)) a(v10 + VL,,, Sfl (Dt ) These approximations are useful in simplifying the analysis ofthe intensity modulation and gas absorption related effect (the second and the third terms in Eq. (20)) and are correct for iuT<<it/2, i=1,2...N-1.…”

Section: Crosstalk Analysismentioning

confidence: 99%

<title>Crosstalk analysis of a TDM fiber gas sensor array using wavelength modulation of the DFB laser</title>

Jin

1999

SPIE Proceedings

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The results of an investigation on the performance of a time-division addressed fibre optic gas sensor array using wavelength modulation of the DFB laser are reported. The system performance is found to be limited seriously by the extinction ratio of the optical switch used for pulse amplitude modulation. Formulas that relate the crosstalk level to the extinction ratio of the switch, the modulation parameters of the DFB laser and the optical path difference between sensing channels are derived. Computer simulation shows that a methane gas sensor array of 20 sensors with a detection sensitivity of 2000ppm (10cm gas cell) for each individual sensor may be realised using present commercial available single Mach-Zehnder type amplitude modulator (-35dB extinction ratio). An array of 100 sensors with lOOppm detection sensitivity for each sensor may be realised if a double Mach-Zehnder type amplitude modulator is used.

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“…MSHC is tightly associated with the signal demodulation scheme which is the key technique of the FOIS systems. In recent years, several demodulation schemes have been developed, and the most widely used are phase generated carrier (PGC) [3][4][5][6][7] and the heterodyne [8][9][10][11][12] demodulation scheme, especially in the FIOS arrays. The PGC demodulation scheme introduces a phase carrier in the interferometer by sinusoidally modulating the optical frequency or phase, and there are infinite harmonics of the modulation frequency in the interferometric signal.…”

Section: Introductionmentioning

confidence: 99%

Investigation on the maximum signal handling capability of fiber optic interferometric sensor based on the digital heterodyne demodulation scheme

Zhang

Rao²,

Zhang

et al. 2014

Optik

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64-element time-division multiplexed interferometric sensor array with EDFA telemetry

Cited by 17 publications

References 6 publications

Performance analysis of a time-division-multiplexed fiber-optic gas-sensor array by wavelength modulation of a distributed-feedback laser

Performance analysis of a time-division-multiplexed fiber-optic gas-sensor array by wavelength modulation of a distributed-feedback laser

<title>Crosstalk analysis of a TDM fiber gas sensor array using wavelength modulation of the DFB laser</title>

Investigation on the maximum signal handling capability of fiber optic interferometric sensor based on the digital heterodyne demodulation scheme

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