International Telecommunication Union
ITU-T
Technologies and applications
of Passive Optical Networks
(PON)
Yukio Nakano
Hitachi
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
FTTH Penetration in Japan
Number of FTTH users
ITU-T
5M
4M
3M
2M
B-PON introduction
Sept. 2002
1M
0
June
Dec
2002
June Dec
2003
June
Dec
2004
June Dec
2005
Source: Ministry of Internal Affairs and Communication, Japan
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
2
PON Technologies
ITU-T
Optical splitter (passive)
ONU
Bi-directional transmission
over one fiber using WDM
1490nm
CO
1310nm
OLT
ONU
ONU
Core
Network
Upstream packet multiplexing
on fiber without collision
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
3
PON Advantages
ITU-T
o
Very high speed data up to 1 Gbit/s to
home and businesses
o
Maintenance cost reduction due to no
electronics between CO and customers
o
Low cost due to fiber and CO interface
shared by several customers
o
Constant data rate regardless of reach
o
Multiple applications including data (IP),
video and voice (triple play)
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
4
Broadband Internet application
ITU-T
o FTTH in Japan started from simple application of
IP/Ethernet and it is still dominant
o Simple indoor ONU enabling economical Broadband
access of 100 Mbit/s best effort service
o The service is like simple extension of ADSL
Home
ONU
CO
OLT
Internet
Internet
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
5
Triple play with RF video
ITU-T
o RF overlay using WDM provides conventional
CATV type video service in addition to
Broadband Internet
o Very popular in North America
Home or Business
Central Office
Voice
OLT
WDM
Data
Downstream
ONT Data + RF video
Voice
Voice
Network
Network
Upstream
Data
RF video
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
Data
Data
Network
Network
RF
RF
Video
Video
6
IP triple play application
ITU-T
o Home Gateways to separate IP video and
provide POTS conversion
o Entire network based on IP and Ethernet
CO
Home
Voice
Voice
Network
Network
ONU
Home
Gateway
OLT
Video
Video
Network
Network
Data
Data
Network
Network
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
7
PON Comparison
ITU-T
B-PON
Standard
GE-PON
ITU-T G.983 IEEE 802.3ah
G-PON
ITU-T G.984
Downstream
data rate
600 Mbit/s
1 Gbit/s
2.4 Gbit/s
Upstream
data rate
150 Mbit/s
1 Gbit/s
1.2 Gbit/s
Ethernet
Ethernet +
TDM +ATM
Transmission
Format
ATM
(Note) Rates of common practice.
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
8
Why GPON now?
ITU-T
o
Standardized by telecom operators and telecom
vendors in ITU-T
o
Various operation and management capability
inherited from conventional proved telecom
technologies
o
Future-proof bandwidth
o
•
2.4 G / 64 users = 35 M per user
•
35 M = 6 M (HDTV-MPEG4) x 4 ch + 10 M (Internet)
Suitable for business users because of various
QoS and bandwidth management
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
9
GPON example
ITU-T
ONU
(Single Family Unit)
IPTV
IPTV
systems
systems
2.4 G
OLT
10G/1G
1G
10
0M
100M
Internet
Internet
1.2 G
20 km
VoIP
VoIP
systems
systems
ONU
(Multi Dwelling/Tenant Unit)
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
10
Possible Future Directions
ITU-T
o
Technology available and massive GPON
deployment soon
o
IP HDTV service in near future
o
More bandwidth by higher transmission
rate or WDM technology
o
Longer reach by optical amplifier
o
Higher splitter ratio (more users per
PON) by optical amplifier
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
11
Conclusion
ITU-T
o
B-PON initiated the first massive PON
rollout in Japan
o
PON technology is suitable for triple play
services (voice, video, data)
o
Future-proof G-PON technology available
and soon to be deployed massively
ITU-T Workshop “NGN and its Transport Networks“
Kobe, 20-21 April 2006
12