Stephan Neidlinger, WDM PON Forum Workshop

Nice, France, June 23, 2014

Tunable DWDM PON

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Today’s CWDM Backhaul

ONU 1

ONU 2

ONU N

POP Fastweb

OLT or PoP Remote Node

• Shipping in volumes

• Dual fiber working CWDM design with up to 16 channels supported

• Outdoor deployment supported (ext. temp range: -25°C to +70°C)

• Pluggable modules used having fixed wavelengths

CPE SFP+ /XFP

RX TX

CPE SFP+ /XFP

RX TX

Feeder Fiber

Distribution Fiber

CPE SFP+ /XFP

RX TX

SFP+/XFP TX RX

SFP+/XFP TX RX

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Passive WDM

Colored CWDM/DWDM Colored CWDM/DWDM

Challenges of Passive Optical Multiplexing

Passive optical multiplexing is the most cost effective WDM solution, but there are some challenges involved

• No clear demarcation between client and transport equipment

• Client equipment has no integration into a transport-NMS

• Root cause analysis is difficult as there is only limited information available at the central node about the far end

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Moving to higher Service Channel Counts

• Increasing wavelength channel throughput

• Using multiplexing transponders (Time Division Multiplexing)

• Ideal for GbE services

• Increasing number of wavelengthes

• Dense wavelength division multiplexing (DWDM)

• Ideal for higher bit rate services

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Increasing Wavelength Channel Throughput TDM/CWDM Backhaul

POP Fastweb

CO or PoP Remote Node

• Reuse of (deployed) CWDM infrastructure

• Multiplexing transponders in CO/PoP and remote node or at customer premises

• Additional demarcation function

Feeder Fiber

e. g.

Nx GbE

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• Number of wavelength channels 40/80 (or more)

• Key requirements/challanges

• OLT: PIC-based multi channel DWDM transceiver modules

• Outdoor capable DWDM filters (-25°C to +70°C)

• ONU: Tunable laser components

• System: Wavelength tuning mechanism

Increasing Number of Wavelengthes DWDM PON

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Tunable DWDM PON System Architecture

40/80 channel

DWDM Tb/s Aggregation OLT Central wavelength control

PIC-based Nx 1..10G DWDM

transceiver module

Low-cost tunable 1..10G SFP/SFF

transceiver ITU-T G.698.3 wavelength grid

Transparent service delivery to large number of users

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Tunable DWDM PON Wavelength tuning mechanism

ONU#n

SFP OLT

RN

AW

G

TX/RX

Array

PIC … Tunable LD

Receiver

l-Control

C/L Tuning

So

C,

Clie

nt I/

Fs, e

tc.

Wavelength

Control Loop

L2

Access

Switch

Auto-tuning of ONU, controlled by OLT

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C/DWDM PON Summary

C/DWDM PON supports today’s needs and delivers a future-proof upgrade path

• Simple, robust

• Outdoor capable

• Shipping in volumes

CWDM PON

• Increased service channel count

• Reuse of existing CWDM infrastructure

TDM/CWDM

• Highest channel count

• Transparent service delivery

DWDM PON

info@advaoptical.com

Thank You

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