Date et page . 1

FTTH deployment acceleration thanks to extraction techniques

Real Helvenstein & Jean Fehlbaum

Seite . 2Nexans – Optical Fibres Cables & Components BG

INTRODUCTION

In western Europe the development of FTTH networks is following several important trends :

1. Mutualisation : from single fibre « Open Access » networks to multi-fibre multi-operator networks

2. Hybridation : combination between P2P interconnections for enterprise networks and GPON for residential customers

3. Extensive reuse of existing ROWs (Right-of-ways) : the most favourable infrastructure for FTTH deployment is chosen for the mutualisation (generally incumbent operators, but sometimes also CATV operators or utilities)

4. Major issue : cost reduction and risk sharing between competitors (legal, technical and commercial issue) => deployment capex reduction

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FTTH Pilot project 2010

P2P project 400% / Cooperation ILEC - Utilities

Seite . 4Nexans – Optical Fibres Cables & Components BG

Underground cable laying :

Classical pulling

Classical blowing

Micro-blowing

Micro-bundleextraction

+ +

Innovations in cable laying techniques=> Importance of infrastructure sharing

Micro-cables in power cablesNano-cables in telecom-nano-ducts

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Micro-ducts network with duct branching

Classical splicing and branching

Classical midspan technique

Straight midspan technique without extraction

Straight midspan technique with extraction

Straight midspan technique with extraction and repair possibility

Innovations in cable branching techniques

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Cable reserve in the branch-off location (6 to 10m).

Optical fibres standard cable

Cable reserve

Building 1Building 2 Building 3

Classical midspan branching technique

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Cable reserve in the branch-off location (6 to 10m).

Flexibility point

Branching closure with midspan technique

WCT 1.5

Classical midspan branching technique

Building 1Building 2 Building 3

Conditions :1. Manhole2. Cable reserve3. Splicing

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Creating the customer ConnectionsSequence of steps to extract a nano-drop cable at each subscriber site and

create a loop back to utilise all the available nano-drop modules

Cable

Central bundle with distribution fibre

DP loop back splice enclosure

4. Second extraction of the nanodrop cable

3. Extract the nano drop cable for routing

to building entry

2. cut of the extractable nano

drop cable at upstream location

1. Splice fibres from the extracted nano-drop cable to

the fibres in the inner layer tubes

Dry nano-tube containing the extractable nano-drop cable

Fibre splices

New straight midspan branching technique with extraction (spliceless)

Cable Sheath Aperture (protected by

extraction enclosure).

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FRANCEISSUE 2 DIFFERENTIATION:

TCO analyse and value transfer

Patent pending~3’000 kilometers already installed

Conditions :1. Handhole2. No cable reserve3. No splicing

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OPEX Optimization

New demand from the market : repairability Avoid cumulative transmission degradation caused by multiple repairs All the optical fibres micro and nanocables are movable inside the main

cable structure

Design (2 fibre variant shown)1 : 250um coated fibre2 : Aramid reinforcement yarns3 : LSHF Fire retardant sheathPatent pending

Seite . 11Nexans – Optical Fibres Cables & Components BG

LBC

User 24 User 14 User 13 User 12 User 11

DP

User 1

OSP Pull Back Cable repair.Initial configuration Distribution fibers

nanodrops

User microduct

Branching box

. . . . . .

Seite . 12Nexans – Optical Fibres Cables & Components BG

LBC

User 24 User 14 User 13 User 12 User 11

DP

User 1

User microduct

Branching box

. . .. . .

OSP Pull Back Cable repair.Incident on main cable

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LBC

User 24 User 14 User 13 User 12 User 11

DP

User 1

User microduct

Branching box

. . .. . .

OSP Pull Back Cable repair.Incident on main cableRemoval of faultive microcable and nanocables

Seite . 14Nexans – Optical Fibres Cables & Components BG

LBC

User 24 User 14 User 13 User 12 User 11

DP

User 1

User microduct

Branching box

. . .. . .

OSP Pull Back Cable repair.Incident on main cableRemoval of faultive microcable and nanocablesRepair of cable : pneumatic continuity

Seite . 15Nexans – Optical Fibres Cables & Components BG

LBC

User 24 User 14 User 13 User 12 User 11

DP

User 1

User microduct

Branching box

. . .. . .

OSP Pull Back Cable repair.Incident on main cableRemoval of faultive microcable and nanocablesRepair of cable : pneumatic continuityRe-installation of the microcable and nanocables

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Cost comparison between all branching techniques

0

500

1000

1500

2000

2500

3000

3500

4000

4500

5000

Direct Buried µduct/µcable cabling on demand

µduct/µcable all at once

Cable with nanoduct/nanocable

Optical cables Optical components µduct system Field workforce

Seite . 17Nexans – Optical Fibres Cables & Components BG

CONCLUSION

Advantages of extraction techniquesCapex reduction of > 30% in the outside

plant.

Avoids splicing operations in the branching points.

Accelerates deployment in the distribution network.