1. ITU-T Kaleidoscope 2009 Innovations for Digital Inclusion
OPTICAL TRANSPORT NETWORKS: FROM ALL-OPTICAL TO DIGITAL
Virgilio Puglia
Olga Zadedyurina
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009

2. Traditional DWDM based on OTN (Optical Transport Network) ITU-T G.872;
Outlines
Traditional DWDM based on OTN (Optical Transport Network) ITU-T G.872;
IPoDWDM;
ODN (Optical Digital Network);
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

3. IP traffic today becomes dominant:
Introduction
IP traffic today becomes dominant:
New application based on IP (video communication, P2P, etc.);
Old application migrate to IP (ex. SS7);
IP traffic has overcome capacity of currently used wavelength 10Gb/s;
Today trend/evolution is:
Eliminate SDH/SONET layer;
Move Transport from Optical to Digital;
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

4. Traditional DWDM as an OTN
DWDM is a fully optical network which provides transparency:
only 1R regeneration (optical amplification-equalization and CD compensation);
theoretically the signal can be delivered from every ONE to any other.
Traditional (OTN) approach becomes hardly realizable for big network;
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

5. Insert IP traffic into DWDM without mapping into SDH frame;
IPoDWDM Approach
Insert IP traffic into DWDM without mapping into SDH frame;
Integration of DWDM transponders directly into IP switch/router.
Transponder
G.709
IP routers
OTN
IPoDWDM
G.709
Transponder
IP routers
Colored interface
Transponder
MUX
Transponder
Gray interface
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

6. IPoDWDM intelligence Preemptive traffic protection becomes possible
OTN
Working path
Lost
data
Protection p.
Work path
Protection path
BER
BER
Corrected bits
Optical Impaiments
FEC Limit
POS on router
LOF
IP Layer
IP Layer + G.709 on router
FEC Limit
SDH/DWDM Layer
Corrected bits
Transponder
Switch threshold
Optical Impaiments
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

7. Optical Digital Network Approach
The philosophy of ODN is based on O-E-O conversion whenever it is possible.
OTN manipulate analogical wavelengths;
ODN manipulate digital “bits”.
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

8. Network Layers: OTN vs ODN
OTM0
Physical
Section
(OPSO)
Optical Transmission
Section(OTS)
Optical Multiplex
Section (OMS)
Optical Channel (OCh)
Optical Channel Transport Unit (OTU)
Optical Channel Data Unit (ODU)
Optical Channel Payload Unit (OPU)
IP ATM Ethernet STM-N
Digital
Analog
(not colored,
no OSC)
OTM0
Physical
Section
(OPSO)
Optical Transmission
Section (OTS)
Band Multiplex
Section (BMS)
Optical Digital Channel (ODCh)
Optical Channel Transport Unit (OTU)
Optical Channel Data Unit (ODU)
Optical Channel Payload Unit (OPU)
IP ATM Ethernet STM-N
Digital
Analog
(not colored,
no OSC)
Optical Transport Module (OTM-n, n>1)
Optical Transport
Module (OTM-n,
n>1)
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

9. Each OADM site implements 3R regeneration:
ODN advantages
Each OADM site implements 3R regeneration:
the signal is cleaned up from noise and others distortion;
It becomes possible to implement higher number of Channels -160
(C band, spacing 25 GHz);
The network lose transparency.
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

10. ODADM Description Optical pass-through MBM FEC Digital W. DSP FEC
East Line
West Line
O-E
O-E
O-E
O-E
O-E
O-E
Optical Spliter
O-E
Matrix
Matrix
O-E
Optical Spliter
O-E
O-E
O-E
O-E
O-E
O-E
Electrical connection
Optical connection
To interface modules
To interface modules
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion
Specific Interface Module

11. RECONCILATION BETWEEN THE APPROACHES
To integrate different approach the existing OTN network must support Alien Wavelets (ITU-T G.698.2)
IPoDWDM is easy to integrate into OTN;
IPoDWDM is easy to integrate into ODN but not efficiently;
ODN can be integrate into OTN using an optical band split filter.
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

12. Example of ODN-OTN integration
The majority of deployed DWDM networks are equipped with 100GHz lambda spacing while transponders have stability for 50GHz spacing.
Even frequencies
100
Ghz
East Line
50Ghz-100Ghz Filter
C-Band ODADM
C-Band ROADM
192.3
192.5
192
192.1
192.2
192.4
192.6
West Line
100
Ghz
192.05
192.15
192.25
192.35
192.45
192.55
192.65
192.75
Odd frequencies
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

13. Capacity Evolution New capacities are being studied by IEEE 802.3ba
10 Gb/s -> 40 Gb/s -> 100 Gb/s
- CD increases and PMD appears;
ODN and IPoDWDM:
- the limit of 160 channels (L+C band)
ODN:
- due to E-O-E no dispersion problems.
- granularity of PIC is inflexible parameter (today either 10 or 40 Gb/s based)
New capacities are being studied by
IEEE 802.3ba
G should standardize new interfaces
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

14. OTN, IPoDWDM, ODN approaches analyzed;
Conclusions
OTN, IPoDWDM, ODN approaches analyzed;
IPoDWDM and ODN are seen as very promissing;
Examples on integration of both technologies;
Stimulus for further research and standardization activities;
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

15. Back up
The following slide are for back up

16. OTN Network Elements OLT (Optical Line Terminal)
OTS
OMS
Och (not terminated in OADM site)
Client (not terminated in OADM site)
OLT
OADM
OLA
OLT (Optical Line Terminal)
OADM/ROADM (Optical Add Drop Multiplexer) also Reconfigurable
OLA (Optical Line Amplifier)
OXC (Optical Cross-Connect)
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

17. IPoDWDM Network Elements
OTS
OMS
DWDM MUX/DMUX
Optical fibre
Optical Line Amplifier
Optical colored interface
Client-OCh-OTU-ODU-OPU (yellow & green lambda)
OCh - Optical Channel
OMS - Optical Multiplex Section
ONE - Optical Network Element
OTS - Optical Transmission Section
OTU - Optical Channel Transport Unit
ODU - Optical Channel Data Unit
OPU - Optical Channel Payload Unit
G “black-link”
IP Router
Client-OCh-OTU-ODU-OPU
(red & blue lambda)
Client-OCh-OTU-ODU-
OPU(red & blue lambda)
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion

18. ODN Network Elements Client OPU ODU OTU OTU ODCh ODCh BMS BMS OTS OTS
DNE
DNE
DNE
OPU - Optical Channel Payload Unit
Electrical connection
ODU - Optical Channel Data Unit
Optical connection
OTU - Optical Channel Transport Unit
DNE - Digital Network Element
OLA (Optical Line Amplifier)
ODCh - Optical Channel
BMS - Band Multiplex Section
MBM (Multiplexing Band Module)
OTS - Optical Transmission Section
Mar del Plata, Argentina, 31 Aug – 1 Sep 2009
ITU-T Kaleidoscope 2009 – Innovations for Digital Inclusion