The theory and application of fiber optic sensors with spread parameters

Contents

Foreword

1. A brief overview and classification of the fiber optic sensors

2. Intrinsic distributed sensors

3. Optical Time-Domain Reflectometry (OTDR) - conventional approach

• 3.1 Basic principles of the method
• 3.2 Theoretical description of the conventional OTDR
• 3.3 Dynamical range and resolution of the conventional OTDR
• 3.4 The main aspects of the signal processing in conventional OTDR
• 3.5 Conclusions
• 3.6 References

4. Modifications of OTDR

• 4.1 Coherent OTDR (CO-OTDR)
• 4.2 Correlation OTDR (C-OTDR)
• 4.2.1 Correlation OTDR based on the use of pseudorandom signal (PRS C-OTDR)
• 4.2.2 Complementary correlated OTDR (CC-OTDR)
• 4.2.3 References
• 4.3 Low correlation OTDR (LC-OTDR)
• 4.3.1 Introduction
• 4.3.2 The principles of the LC-OTDR
• 4.3.3 Spatial resolution
• 4.3.4 The influence of dispersion
• 4.3.5 Experimental results
• 4.3.6 References
• 4.4 Photon-Counting OTDR (PC-OTDR)
• 4.4.1 Introduction
• 4.4.2 Theoretical background
• 4.4.3 The correction of the measured data
• 4.4.4 Application of the method and results
• 4.4.5 Conclusions
• 4.4.6 References

5. Optical Frequency-Domain Reflectometry (OFDR)

• 5.1 OFDR with the frequency scanning (OFDR-FS)
• 5.1.1 Introduction
• 5.1.2 Theoretical background of OFDR-FS
• 5.1.3 Limitation by coherence length and phase noise
• 5.1.4 Limitations by other factors
• 5.1.5 References
• 5.2 OFDR with the synthesized coherence function (OFDR-SCF)
• 5.2.1 Introduction
• 5.2.2 The principle of the OFDR-SCF
• 5.2.3 The synthesis of the coherence function
• 5.2.4 Basic properties of the OFDR-SCF
• 5.2.5 Conclusions
• 5.2.6 References

6. Polarization OTDR (PO-OTDR)

• 6.1 Introduction
• 6.2 Two definitions of PMD
• 6.3 A brief review of the "conventional" PMD measurement methods
• 6.4 Original single impulse OTDR
• 6.5 Basics of the polarization optical time-domain reflectometry
• 6.6 The simple approach to the evaluation of the local birefringence distribution from the PO-OTDR data
• 6.7 The more advanced approach to the evaluation of the local birefringence distribution from the PO-OTDR data
• 6.8 Conclusions
• 6.9 References

7. Conclusion