fault localization of pon
DESCRIPTION
Fault Localization of PON. Yeung Chue Hei (1008620051) Lam Yi Kwan (1008627154). Network Structure. FTTX (fiber to the X) Passive (PON) Multiplexing ( → P2MP) TDM WDM. Goals. Maintain service quality 1/3 of service disruptions are due to fiber cable Fault can be a disaster - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/1.jpg)
Fault Localization of PON
Yeung Chue Hei (1008620051)Lam Yi Kwan (1008627154)
![Page 2: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/2.jpg)
Network Structure
FTTX (fiber to the X)Passive (PON)Multiplexing (→P2MP)
TDMWDM
![Page 3: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/3.jpg)
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
![Page 4: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/4.jpg)
Challenges
High resolution VS high DR capabilitiesMeasurement timePoint-to-multipoint problem
![Page 5: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/5.jpg)
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
![Page 6: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/6.jpg)
Solutions for WDM-PONs
Tunable OTDR/multi-wavelength source and optical reflectorRe-using existing light sourcesCommercial multi-wavelength OTDR
![Page 7: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/7.jpg)
Other solutions
Optical Code-division MultiplexingOptical Frequency Domain Reflectometry
![Page 8: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/8.jpg)
Measuring the Individual Attenuation Distribution of Passive
Branched Optical NetworksKuniaki Tanaka, Mitsuhiro Tateda, Senior Member, IEEE,
and Yasuyuki Inoue, Member, IEEEIEEE PHOTONICS TECHNOLOGY LETTERS, VOL 8,
NO 7, JULY 1996
![Page 9: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/9.jpg)
Reference Reflector
![Page 10: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/10.jpg)
Reference Reflector
Conventional OTDRSpecially designed branched networks Transmission line lengths differ with each other
Cannot test branched fiber losses individuallyGo to the subscriber terminals after branching and measure the transmission loss directly
![Page 11: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/11.jpg)
Passive By-pass
![Page 12: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/12.jpg)
“New” method
![Page 13: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/13.jpg)
Arrayed Waveguide Grating (AWG)
![Page 14: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/14.jpg)
Optical Splitter/Router Module
![Page 15: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/15.jpg)
Optical Splitter/Router Module
![Page 16: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/16.jpg)
Optical Splitter/Router Module
![Page 17: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/17.jpg)
OTDR Configuration
![Page 18: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/18.jpg)
OTDR Traces
![Page 19: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/19.jpg)
Fiber Fault Identification for Branched Access Networks Using a Wavelength-
Sweeping Monitoring SourceChun-Kit Chan, Frank Tong,
Lian-Kuan Chen, Keang-Po Ho, Dennis Lam
![Page 20: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/20.jpg)
Introduction
Conventional OTDR cannot differentiate Rayleigh backscattered light from different branchesMultiwavelength OTDR is expensive
![Page 21: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/21.jpg)
Fiber Identification Scheme
![Page 22: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/22.jpg)
![Page 23: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/23.jpg)
To avoid pulse collision(2nL/c) < 1/(Nf)Eg. N=8, f=1kHz, n=1.5, max L=12.5km
![Page 24: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/24.jpg)
Experiment
1 x 4 branched optical networkData channels: 1548nm, 1551nm1Gb/s 210-1 PRBS NRZL1=8.8km, L2=L3=6.6km, L4 is unmonitoredFBG: 1556.4nm, 1558nm, 1559.7nm3dB passband: 0.4nm, 0.8nm, 0.9nmSawtoothed signal: 2kHz
![Page 25: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/25.jpg)
![Page 26: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/26.jpg)
![Page 27: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/27.jpg)
![Page 28: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/28.jpg)
Summary
Makes use of FBGsNo additional monitoring sourceBoth time and frequency domainWith OTDR techniques, can locate exact fiber cut position
![Page 29: Fault Localization of PON](https://reader035.vdocument.in/reader035/viewer/2022081502/56815d3e550346895dcb450a/html5/thumbnails/29.jpg)
Q&A
Thank you for your attention!