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Fault Localization of PON

This article discusses the goals and challenges in fault localization of Passive Optical Networks (PON). It explores various solutions for TDM-PONs and WDM-PONs, including passive and active bypass methods, integrated OTDR functionality, and multi-wavelength sources.

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Fault Localization of PON

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  1. Fault Localization of PON Yeung Chue Hei (1008620051)Lam Yi Kwan (1008627154)

  2. Network Structure • FTTX (fiber to the X) • Passive (PON) • Multiplexing (→P2MP) • TDM • WDM

  3. Goals • Maintain service quality • 1/3 of service disruptions are due to fiber cable • Fault can be a disaster • Assisting reparation • Reduce lost • Efficiency • Not affecting the other service

  4. Challenges High resolution VS high DR capabilities Measurement time Point-to-multipoint problem

  5. Solutions for TDM-PONs • P2P • Active By-pass • Passive By-pass • Integrated OTDR functionality • P2MP • Tunable OTDR and wavelength selective reflectors • Conventional OTDR and controlled reference reflections • Brillouin OTDR

  6. Solutions for WDM-PONs Tunable OTDR/multi-wavelength source and optical reflector Re-using existing light sources Commercial multi-wavelength OTDR

  7. Other solutions Optical Code-division Multiplexing Optical Frequency Domain Reflectometry

  8. Measuring the Individual Attenuation Distribution of Passive Branched Optical Networks Kuniaki Tanaka, Mitsuhiro Tateda, Senior Member, IEEE, and Yasuyuki Inoue, Member, IEEE IEEE PHOTONICS TECHNOLOGY LETTERS, VOL 8, NO 7, JULY 1996

  9. Reference Reflector

  10. Reference Reflector • Conventional OTDR • Specially designed branched networks • Transmission line lengths differ with each other • Cannot test branched fiber losses individually • Go to the subscriber terminals after branching and measure the transmission loss directly

  11. Passive By-pass

  12. “New” method

  13. Arrayed Waveguide Grating (AWG)

  14. Optical Splitter/Router Module

  15. Optical Splitter/Router Module

  16. Optical Splitter/Router Module

  17. OTDR Configuration

  18. OTDR Traces

  19. Fiber Fault Identification for Branched Access Networks Using a Wavelength-Sweeping Monitoring Source Chun-Kit Chan, Frank Tong,Lian-Kuan Chen, Keang-Po Ho, Dennis Lam

  20. Introduction Conventional OTDR cannot differentiate Rayleigh backscattered light from different branches Multiwavelength OTDR is expensive

  21. Fiber Identification Scheme

  22. To avoid pulse collision (2nL/c) < 1/(Nf) Eg. N=8, f=1kHz, n=1.5, max L=12.5km

  23. Experiment 1 x 4 branched optical network Data channels: 1548nm, 1551nm 1Gb/s 210-1 PRBS NRZ L1=8.8km, L2=L3=6.6km, L4 is unmonitored FBG: 1556.4nm, 1558nm, 1559.7nm 3dB passband: 0.4nm, 0.8nm, 0.9nm Sawtoothed signal: 2kHz

  24. Summary Makes use of FBGs No additional monitoring source Both time and frequency domain With OTDR techniques, can locate exact fiber cut position

  25. Q&A Thank you for your attention!

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