Saptadeep PalCTVR, Trinity College Dublin.
Key Features:• Sparse Population. User density is usually verylow. Cost of Deployment per user is High• User premises are...
Standard network architectures:Fig: GPON architecture (ITU-T G.984 standard)With this architecture we cannot reach many us...
A Step forward towards a Long-ReachUsing GPON Extender (typically an 1:1 Amplifier or regenerator)the span of the network ...
A Better and Flexible Architecture:GPON extender with multiple branching allows adding splitters and ONUs at alater stage ...
Proposed Network architectures:Proposals aboutarchitecture andnetwork elementsAdvantages anddiscussions on theResultsUnive...
Proposals aboutarchitecture andnetwork elementsAdvantages anddiscussions on theResultsDarren P. Shea et. al.(BT networks) ...
Key points of these architectures: Amplifiers at the central office Remote node in a network: Upgradability and further ...
Genetic Algorithm Based Network Planning:GU Rentao et. al., Beijing, ChinaEvolutionary 2-stage methodThe best locations ...
Open Problems:o Use of amplifiers in various stageso Using OFDM in rural areas with fiber deployment alongside Roads onlyo...
LR PON IN RURAL SCENARIO
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LR PON IN RURAL SCENARIO

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LR PON IN RURAL SCENARIO

  1. 1. Saptadeep PalCTVR, Trinity College Dublin.
  2. 2. Key Features:• Sparse Population. User density is usually verylow. Cost of Deployment per user is High• User premises are distributed over a largergeographical area. Fiber length per user ishigh• Generally far from the urban regions.  Morefiber required to connect to the metro/corenode as well• OSNR problem due to longer fiber portions infeeder and distribution part.
  3. 3. Standard network architectures:Fig: GPON architecture (ITU-T G.984 standard)With this architecture we cannot reach many users in rural areas asthe span of reach is constrained within 20 Km. Suitable for denserURBAN regions.Courtesy: TELNET
  4. 4. A Step forward towards a Long-ReachUsing GPON Extender (typically an 1:1 Amplifier or regenerator)the span of the network can be increased to 60 Km and can serveas many as 128 users per OLT. Suitable for less dense and sparselydistributed population.Courtesy: TELNET
  5. 5. A Better and Flexible Architecture:GPON extender with multiple branching allows adding splitters and ONUs at alater stage without affecting the total reach or the OSNR at the other ONUs. 256users can be reached.Courtesy: TELNET
  6. 6. Proposed Network architectures:Proposals aboutarchitecture andnetwork elementsAdvantages anddiscussions on theResultsUniversity ofMelbourne.(R.S. Tucker)*• Raman Amplifier & SOA at OLT• Dual wavelength (US-DS)• 1:32 split ratio• Passive Long-Reach Field• 60 Km.• Implementation in Tasmaniaresulted in decrease of COnumbers from 96 to 27University ofMelbourne.(R.S. Tucker)**• Dual-Fiber• EDFA at the CO keeping the feederand distribution section passive• 1:64 split• About 15% less power required intransmission• Reach can be increased byincreasing signal power• Simple upgradability• High bandwidth in upstream anddownstreamUniversity ofCalifornia, Davis.Lei Shi, Avishek Nag #• BER-aware wavelength allocationin WDM PON• Remote Nodes in the Networkwhich contains AWG & EDFA• Average BER per ONU increases• Suitable for LR-PON architectureas BER is one of the mainstreamissues in design of such anetworkK. Kanonakis et. al.(IEEE members)(ACCORDANCE FP7) ++• OFDM-over-WDM/TDM• Use of Back-to-Back Amplifiers• No-amplification required fortransmission of 78 km• Upgradability is easier• Less power, more bandwidth, lessBER
  7. 7. Proposals aboutarchitecture andnetwork elementsAdvantages anddiscussions on theResultsDarren P. Shea et. al.(BT networks) ^^• 1024-split architecture• Use of EDFAs in the backhaulsection of 90 Km• 3-stage splitting in thedistribution section• Very long reach of about 100km• Multi-stage amplificationrequired• Addition of noise anddegradation of OSNR• Non-passive fieldITM, KTH & AtellusAB(Sweden)H.E. Sandstrom et. al.• 3 access nodes in the network• Splice points and splitters forend-users• Using amplifiers and regeneratorsinstead of increasing Cos• Economically possible todistribute access networks inareas with <1 person/km• Laying of fiber besides main-stream roads only for accessnetworks is a better optionC.H. Chang et. al.National University ofTaiwan• OFDM and AWG• BTB amplifiers• Less BER with less Power ascompared to non-OFDMarchitectures• Reach can be increased usingsuch BTB techniques
  8. 8. Key points of these architectures: Amplifiers at the central office Remote node in a network: Upgradability and further reach Back to Back amplifiers OFDM (over WDM/TDM) Fiber deployment along Primary/Main Roads
  9. 9. Genetic Algorithm Based Network Planning:GU Rentao et. al., Beijing, ChinaEvolutionary 2-stage methodThe best locations of splitters are chosenWith the splitter location, the optimal solution for best connectionarrangement is found outLosses have been considered alongside maximum reachGives very good results with error of less than 0.5% even with 256 ONUs
  10. 10. Open Problems:o Use of amplifiers in various stageso Using OFDM in rural areas with fiber deployment alongside Roads onlyo Using Back to back amplifiers in the feedero Dual-fiber architectureo Genetic algorithm approach
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