ITU/MIC Training on Bridging the Standardization
June 20th 2007
Optical Access System
Implementation
- ITU-T G-PON Technology-
Tohru Kazawa
Hitachi Communication Technologies
tohru.kazawa.en@hitachi.com
Contents
1
Optical Access System Market
2
G-PON and Standardization
3
Implementation of G-PON System
and Service
4
Toward future -10G-PON-
Broadband Users in Japan
ADSL : 57%
14.39 Million users
-95k increase from Mar.
As of the end of September, 2006
total：25.04 Million users
CATV : 14%
up to
50.5Mbps
[12.5Mbps]
3.48 Million users
70k increase from Mar.
up to
30Mbps
[2Mbps]
FTTH : 29%
FTTH : 57%
7.15 Million users
849k increase from Mar.
4.09 Million users
Downstream:1Gbps/100Mbps
[Upstream:1Gbps/100Mbps]
3.06 Million users
FTTB : 43%
* Source: Japanese Government numbers
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
3
Global FTTH Market
North America
EMEA
Asia-Pacific
CALA
15,000
Subscribers (k)
12,500
10,000
7,500
5,000
2,500
0
2003
2004
2005
2006
2007
2008
2009
Source : Ovum-RHK
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
4
FTTH Growth in Japan
Number of Subscribers ( k users)
1000
ADSL
CATV
FTTH
800
600
400
200
0
-200
'04.3Q
'04.4Q
'05.1Q
'05.2Q
'05.3Q
'05.4Q
'06.1Q
'06.2Q
'06.3Q
Source: Ministry of Internal Affairs and Communication (Japan)
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
5
Global Broadband Services
Subscribers Millions
300
250
200
150
100
50
0
2003 2004 2005 2006 2007 2008 2009
Cable/Other
DSL
FTTH
Source: Ovum-RHK Inc.
Source ： 総務省報告書「次世代BB構想2010」（05.5）
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6
Global FTTH Market Segmentation
Global FTTH Subscribers – 1Q05
4.5 million
North America
4%
EMEA
14%
Asia-Pacific
82%
Source : Ovum-RHK
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7
US FTTH Market
Activity
Aggressive Incumbent builds
(Verizon, SBC, BellSouth)
Numerous Community-Utility,
Property Developer builds
Competitive Situation
Cable-TV operators providing
telephony competition
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8
EU FTTH Market
Europe is late
500K subscribers, 2.6M homes passed by the end of 2004
More than 90% of FTTH-subscribers concentrated in just 5
countries
– Sweden : 200K, Italy : 185K, Denmark : 85K, Netherlands : 50K,
Norway : 15K
167 FTTH-projects – most of them small and/or pilots
Only modest growth in next years
G-PON is gaining momentum
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9
Asia-Pacific FTTH Market
“See The Light” : Asia-Pacific is unique
Market Leaders : “lighthouses on the coast”
– Japan
• More than 3M FTTH subscribers
– Korea
• Extremely high broadband penetration and FTTB
– Hong Kong
Potential and Rising Market : “bright future”
– China
– India
– South-East Asian Countries
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10
Korea FTTH Market
Activity
– Most mature broadband market in the world 95% penetration of
broadband services via DSL, HFC or Apartment LAN
– Incumbent (Korea Telecom) trials in Pusan & Guanju
50K users of WDM-PON trials underway in Guanju City
2K users GE-PON trials
Competition
– Extremely competitive environment
Government/Regulatory
– Government has moved from e-Korea (2002) to u-Korea (“ubiquitous”
integration)
– Plan to build BcN (Broadband Convergence Network) as core network
for U-Korea
BcN Vision
– 50-100Mbps services, HDTV, Video phone
– 1.5M subs 2005, 4.5M subs 2007, 10M subs 2010
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
11
China FTTH Market
Activity
– 15-16 pilots and regional rollout commenced in 2004 Pilots from China
Netcom, China Telecom & China Railcom
– Yongfeng Park Beijing : 1700 users in 2005, target 40-50k
– 3TNET Yangtze Triangle : 5000 subs in 2005, target 60k by 2007
Chuangye Street Wuhan
– 1000 subs in 2005, target (all Wuhan) 500k-1M subs
Government/Regulatory
– Government has announced goal of 75M broadband by 2008
– Regulatory position unclear; risks for new carriers
Carriers/Vendors
– Carriers looks like to use GPON.
– GPON under development in Major vendors such as Huawei
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
12
FTTH Market Driving Factors
Government Policies and Influence
– Korea and China : Initiatives and Support
– Japan : Unbundling
Housing and Population Density : High Profitability
–
–
–
–
MDU : Apartment houses and Condominium
Smaller Houses
MDU in China : > 85 %
Back to Tokyo downtown
Access Loop Network : Efficient CAPEX
– Asia loop length average is 2-2.5 km, vs. 3.5 to 4 km in U.S.
Some Competitive Areas : Japan
– Multiple FTTH service providers
Cultural Issues
– Speed is a key in Korea
– Status Symbol in Japan
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
13
Contents
1
Optical Access System Market
2
G-PON and Standardization
3
Implementation of G-PON System
and Service
4
Towards future -10G-PON-
GPON Characteristics
Broadband
Multi-service
OAM
Interoperability
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
15
PON Bandwidth(Physical bitrate)
B-PON
ITU G-PON
IEEE E-PON
622.08 Mb/s
155.52 Mb/s
2.48832 Gb/s
1.24416 Gb/s
1.25 Gb/s
Upstream
Bitrate
622.08 Mb/s
155.52 Mb/s
2.48832 Gb/s
1.24416 Gb/s
622.08 Mb/s
155.52 Mb/s
1.25 Gb/s
Transmission coding
Scrambled NRZ
Scrambled NRZ
8B10B
Splitting ratio
16, 32
16, 32, 64
More than 16
Downstream
Bitrate
span loss
20 dB (Class A)
25 dB (Class B)
28 dB (Class B+)
30 dB (Class C)
20 dB (Class A)
25 dB (Class B)
28 dB (Class B+)
30 dB (Class C)
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
20 dB (PX10)
25 dB (PX20)
16
Bandwidth Requirements for IP-TV
1
2
3
Category
（not
exclusive）
All TV
program
Broadcasted
Requested TV
program
Multicasted
Video-onDemand
(P-to-P)
characteristic
s
Number of TV channel
Over PON
Channel
bandwidth
PON
downstream
required BW
Simple and
end-to-end
broadband
network
e.g.
100ch～200ch
SDTV:6Mbit/s
600Mbit/s
～1.2Gbit/s
HDTV:20Mbit/s
2～4Gbit/s
IGMP-based
Rich
equipment
(further study
For channel
selection
speed)
e.g. 4chx32ONU
(single family)
SDTV:6Mbit/s
770Mbit/s
HDTV:20Mbit/s
2.6Gbit/s
e.g. 4chx16 users
x32ONU
(multiple families)
=2048ch
(but program limited
e.g.200ch)
SDTV:6Mbit/s
1.2Gbit/s
HDTV:20Mbit/s
4Gbit/s
Super-high
grade videoserver &
Simple and
end-to-end
broadband
network
e.g. 4chx32ONU
(single family)
SDTV:6Mbit/s
770Mbit/s
HDTV:20Mbit/s
2.6Gbit/s
e.g. 4chx16
usersx32ONU
(multiple families)
SDTV:6Mbit/s
13Gbit/s
HDTV:20Mbit/s
41Gbit/s
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
17
GPON Characteristics
Broadband
Multi-service
OAM
Interoperability
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
18
PON Comparison(service viewpoint)
B-PON
Internet
RF
Video
IPTV
IEEE E-PON
VoIP
IP
Ethernet
ATM
Voice
over
ATM
RF Internet
Video
IPTV
VoIP
IP
Ethernet
ITU-T G-PON
Internet
RF
Video
IPTV
VoIP
POTS
(64k)
T1
IP
Ethernet
TDM
GEM
GTC (125 ms frame)
Voice
over
ATM
ATM
GEM: G-PON Encapsulation Method
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19
G-PON Downstream(G.984.3)
•125μs-based framing
•Full-service(Voice, Data,
video supported)
•Payload = ATM+GEM
P-Frame Interval
PCBd
n
Payloadn
TP-Frame = 125 uS
•TDM and variable-length
packet over GEM
P-Frame Interval
PCBd
n+1
Payload n+1
"Pure" ATM cells
Section
PCBd
n+2
TDM & Data Fragments
over GEM Section
N * 53 bytes
GEM header
Payload
Payload length, port-ID, flag, header error protection
GEM: G-PON Encapsulation Mechanism
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20
G-PON Upstream(G.984.3)
•Upstream variable-length framing
(byte-oriented)
T P-Frame = 125 uS
Downstream
PCBd
n
PCBd
n+1
Payload n
•Payload = ATM+GEM
•Pointer of start & stop of burst
frame from ONUs
Payload
n+1
2^n byte
Upstream
Slot
R
Slot
0
Slot
1
Slot
R
Slot
0
Slot
1
US Virtual Frame TX Interval
GFP Only Mode
(Data+TDM)
ATM Only Mode
PLOAM Mode + Contigous
+ TCONTs Support
D /S D ir e c tio n
PCBd
Flags
Flags
PCBu=1
PLOAMu=0
Payload=1
PCBu=1
PLOAMu=0
Payload=0
Flags
Flags
PCBu=1
PLOAMu=1
Payload=0
PCBu=0
PLOAMu=0
Payload=1
FAS
From ONT J
From ONT M [AllocID Z]
PCBu
GFP Fragment
(TDM + Ethernet)
[AllocID Y]
From ONT K [AllocID X]
PCBu
ATM
(Pure ATM Cells)
PCBu
P a y lo a d S e c t io n
US BW Map
[AllocID W]
PLOAM ATM GFP Fragment
ONT
ID
S ta rt
E nd
ONT
ID
S t a rt
End
ONT
ID
S ta rt
End
1
100
300
2
400
500
3
504
600
U /S D ir e c tio n
S lo t
100
S lo t
3 00
ONT 1
S lo t
400
S lo t
500
ONT 2
S lo t
50 4
S lo t
600
ONT 3
U/S Virtual 125 us Frame
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21
GPON Characteristics
Broadband
Multi-service
OAM
Interoperability
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22
ＯＡＭ Function
2．PLOAM： Physical Layer Operation
Administration & Maintenance
（ONU activation, encryption, state control etc.)
PLOAM
P-Frame Interval
P-Frame Interval
Downstream
PCBd
n
Payloadn
PCBd
n+1
Payload n+1
OLT
ONU
GEM
header
OMCI
upstream
GEM Fragment
PCBu
ONU
OMCI
GEM
header
PLOAM
3．OMCI： ONT Management and Control Interface
(version management、UNI type,
connection/VLAN/QoS, etc.)
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1．Alarm： rich alarm for diagnosis
23
Alarm Function
Alarm detected by OLT (partial portion)
items
descriptions
TF
Transmitter failure
LOSi
Loss of signal of ONUi
LOFi
Loss of
PEEi
Physical Equipment Error of ONUi
LCDGi
Loss of GEM channel delineation of ONUi
OAMLi
PLOAM cell loss for ONUi
DOWi
Drift of window for ONUi
SUFi
Startup failure of ONUi
LOAi
Loss of Acknowledge with ONUi
DFi
Deactivate Failure of ONUi
ERRi
Block error detection of ONUi
SDi
Signal Degraded of ONUi
REIi
Remote Error Indication of ONUi
MEMi
Message_Error Message from ONUi
DGi
Receive Dying Gasp of ONUi
“i” indicates ONU-ID
frame of ONUi
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24
PLOAM:
Physical Layer Operation Administration & Maintenance
PLOAM messages (partial portion)
Messages
Description
Upstream_Overhead
OLT assigns burst overhead pattern and pre-assigned delay
Serial_number_mask
Only Indicated serial number ONU can be activated
Assign_ONU-ID
Assign ONU-ID(e.g. 0-31)
Ranging_Time
Equalized delay is set to ONU based on distance
measurement
Deactivate_ONU-ID
De-activation of indicated ONU
Disable_serial_ number Isolation of indicated ONU for system maintenance
Assign_Alloc-ID
Assign Alloc-ID(bandwidth control unit by DBA)
POPUP
Quick re-activation process
Configure Port-ID
Set of port-ID for OMCI communication
Password
Password notification for authentication
Dying_Gasp
Notification of ONU Power-down
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25
OMCI： ONT Management and Control Interface
OMCI Managed Entity (partial portion)
1
Software
Image
1
1
0..2
0..4096
Subscriber
Line Cardholder
1..255
1
1
PON IF
Line Cardholder
0..256
1
0..1
Priority Queue -G
1
Subscriber
Line Card
1..127
0..4096
0..1
0..2
ONT Data
1
ONT-G,
ONT2-G
1..127
1
1
(Up stream)
0..4096
0..4096
1
0..256
1
1
Priority Queue -G
(Downstream)
0..2
PON IF
Line Card - G
1..255
1
Traffic
Scheduler - G
1
PPTP ATM
UNI
UNI
1
1
PON PPTP
1
1
1
1
B -PON
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ANI-G
26
GPON Characteristics
Broadband
Multi-service
OAM
Interoperability
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
27
Interoperability activities in FSAN
06/01 Physical layer connection@Piscataway NJ
06/05 Physical layer connection @Piscataway NJ
06/09 OMCI @Santa Clara CA
06/12 Telecom2006 @Hong Kong
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
28
Contents
1
Optical Access System Market
2
G-PON and Standardization
3
Implementation of G-PON System
and Service
4
Towards future -10G-PON-
GPON System Implementation
≪Home/User office≫
※PON（Passive Optical Network）
GPON-ONT
（Optical Network Terminal）
<<Central Office>>
GPON-OLT
（Optical Line Terminal）
Optical line
・
・
・
IP
Network
2.4Gbit/s
T1
1.2Gbit/s
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TDM
Network
30
Video Service
1. Analog video by WDM
2. IP multicast
1490
1310
Data
Single Family Residential
RFTV STB
RF
RF Video
POTS
1550
RF Video
RF video
ONT
Video OLT
Video
Head-end
IP video
IP video
IPTV STB
IP
OLT
HUB/
Router
10/100/1000bT
IP Network
1:32 or 1:64
splitter
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
31
G-PON Network example
T1
( TDMoGEM)
VoIP
DS3
PSTN
VoIP Switch
8 x DS1
DSX-1
DS1 PRI
ISP
DS3
MetaSwitch Softswitch
Mgt.
GbE
Service Center
IP Video
GbE
IBM PS/2
Television
Hitachi EMS
FTP
DHCP
VoIP EMS
IP STB
GbE IP Video
CAT5/6
Combination RF & IP Video Head End
Satellite dish
RF video
and
IP video
Switch
POTS
CAT5
GPON
RF Video
Tut Systems
1550nm
Analog Video
MPEG-2 Encoder
Comm. Tower
Decode/Modulator
Voice
Data
Laser Transmitter
WDM
Multi-port EDFA
Video
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
1X32 Splitter
IBM PS/2
CAT5/6
Television
RG-6
POTS
CAT5
32
G-PON technical study items
Burst multiplexing
Downstream encryption
Optical burst transmitter
ONU 1
ONU 1
ONU 2
Higher speed
High-speed LD
Rich function
High sensitivity
PD, Receiver
Variable length
Rich Management
Upstream BW control
Bi-directional transmission
over single fiber
Optical burst receiver
Burst mode signal
Burst clock recovery
ONU 2
ONU 1
ONU n
．．．
ONU 2
ONU n
High-speed ASIC
OLT
Optical Splitter
ONU1 ONU2 ONU n
ONU n
．．．
Continuous mode signal
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33
How to use FP-LD and DFB-LD
1500 nm Band transmission
1550nm FP-LD transmission (example)
10- 3
10- 4
Bit rate:
155.52Mbit/s
20km
0km
10- 5
10- 6
10- 7
40km
10- 8
After 40km
10- 9
DFB-LD Area
:DFB-LD
30
Fiber Length (km)
Bit Error Rate
10km
TTC TS-1000
Cass B
TTC TS-1000
Cass A
20
B-PON
156M
FP-LD Area
:FP-LD
10-11
Power penalty
10-13
10-14
-42
-41
-40
-39
-38
-37
-36
-35
G-PON
TTC TS-1000
Cass S
10-10
10-12
B-PON
622M
E-PON
PX10
10
30km
E-PON
PX20
-34
-33
-32
10M
Optical Input Power [dBm]
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
100M
1G
10G
Transmission Bit Rate (bit/s)
34
ONU Transmitter Design
Input Data
Bit rate: 155.52Mb/s
LD
Data
Bias
Cnt.
Pulse current
driver
Imod
Optical
Output
Optical output
first bit reserved
Ibias
Bias current
driver
Off-light level
25ns/div
(less than –45dBm)
Temperature
control
Feed forward
type APC
Optical burst waveform (example)
Optical burst transmitter (example)
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
35
G-PON ONU Transceiver
• Compact structure by Micro-optics
• 1.244Gbit/s burst-mode transmitter with feed-forward APC circuit
• 2.488Gbit/s continuous-mode receiver
Bi-directional Optical module
Data
DFB-LD
LD
Driver
WDM
Feed-forward
APC
Data
Signal
detect
Post
Amplifier
Post Amplifier
1310nm
Single Fiber
LD Driver
1490nm
Preamplifier
(Data)
1550nm
Blocking
Filter
1550nm
Pin-PD
(Video)
Bi-directional Optical module
(Micro-optics structure)
APC : Automatic Power Control
Block diagram
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
36
G-PON ONU Transceiver Operation
10
-3
Ｖcc=3.3V
Ta=25oC
10
200ps/div
Optical Eye Diagram (1.244Gbit/s)
Bit Error Rate
10
Data Input
Quick response from 1st bit
Overload
>0dBm
-4
-5
10
-6
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
G.984.2
Class B
-13
10
-14
10
Optical output
10ns/div
-29 -28 -27 -26 -25 -24 -23 -22 -21 -20 -19
Optical Input Power [dBm]
Transmitter response of Burst-mode signal
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Receiver sensitivity
37
OLT Receiver ATC Design
ONT 1
Input data
Output data
Vth
Peak
detector
ONT 3
ONT 2
Input data
High speed
comparator
1
Vth
3
2
Output data
Reset
Block diagram of ATC
Preamble
Data
Input data
Reset
signal
ONT 1
Vth
ONT 2
Input data
Output data
High speed threshold level setting
Response of ATC
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
Example of Experimental response
38
G-PON OLT Transceiver
• Compact structure by Micro-optics
• 2.488Gbit/s continuous-mode transmitter using DFB-LD
• 1.244Gbit/s burst-mode receiver with high speed ATC circuit
Bi-directional Optical module
LD
Driver
ATC
1490nm
Single Fiber
DFBLD
LD
Driver
Monitor
-PD
Tx
Alarm
WDM
1310nm
APD
Bi-directional Optical module
(Micro-optics structure)
Data
Burst -mode
Pre-amplifier
DC/DC Converter
ATC
Data
Temp. Control
ATC : Automatic Threshold Control
Block diagram
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
39
G-PON OLT Transceiver Operation
10
-3
Ｖcc=3.3V
Ta=25oC
10
100ps/div
Optical Eye Diagram (2.488Gbit/s)
ONU-1
Large signal
(-7dBm)
ONU-2
Small signal
(-28dBm)
4byte
Optical Input
Bit Error Rate
10
-5
10
Overload
>-6dBm
-4
-6
10
-7
10
-8
10
-9
10
-10
10
-11
10
-12
With ONU-1
signal
Without ONU-1
signal
G.984.2
Class B
-13
10
-14
10
Data Output
-36 -35 -34 -33 -32 -31 -30 -29 -28 -27 -26
10ns/div
Burst-mode signal response
Optical Input Power [dBm]
Receive sensitivity (@ONU-2 signal)
All Rights Reserved, Copyright 2007 Hitachi Communication Technologies
40
G-PON OLT/ONT Receiver (class B+)
10 -3
10-3
Ｖcc=3.3V
Ｖcc=3.3V
Ta=25oC
Overload
>-6dBm
-4
10
10
Tc : 85℃
10-6
Tc : 25℃
10-7
Tc : -40℃
10 -5
Bit Error Rate
10-5
10-8
10-9
10-10
G.984.2
Class B+
10-11
10-12
10-13
Overload
>-6dBm
-4
10 -6
With Large
signal
Without Large
signal
10 -7
10 -8
10 -9
G.984.2
Class B+
10 -10
10 -11
10 -12
10 -13
10-14
-35 -34 -33 -32 -31 -30 -29 -28 -27 -26 -25
10 -14
-35 -34 -33 -32 -31 -30 -29 -28 -27 -26 -25
Optical Input Power [dBm]
ONU Receive sensitivity
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Optical Input Power [dBm]
OLT Receive sensitivity
41
DBA (Dynamic Bandwidth Assignment)
Upstream: Dynamic Bandwidth Allocation Control
#1
OLT
ONU
#2
#3
ONU input traffic
User 1: High (e.g. 1000Mbit/s)
User 1 Bandwidth (e.g. 400M)
(e.g. 800M)
User 2: Mid (e.g. 600Mbit/s)
User 2 Bandwidth (e.g. 400M)
User 3: Low (e.g. 200Mbit/s)
User 3 Bandwidth (e.g. 200M)
1000Mbit/s
PON
PONSegment:
Segment:Uplink
Uplinkbandwidth
bandwidthisisdynamically
dynamically
assigned
assignedininaafair
fairmanner
manneramong
amongusers.
users.
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42
DBA Policy
category
category
Fixed
Fixed Bandwidth
Bandwidth
Assured
Assured Bandwidth
Bandwidth
characteristics
characteristics
Always
Always allocated
allocated to
to ONU
ONU independent
independent of
of traffic
traffic request
request
For
For delay/jitter
delay/jitter sensitive
sensitive services
services (e.g.
(e.g. TDM)
TDM)
Allocated
Allocated to
to ONU
ONU based
based on
on traffic
traffic request
request from
from ONU
ONU
IfIf not
not requested,
requested, allocated
allocated to
to other
other ONUs
ONUs
Allacated
Allacated after
after assured
assured bandwidth
bandwidth
Non
Non Assured
Assured Bandwidth
Bandwidth Not guaranteed, and Proportion to assured BW
Not guaranteed, and Proportion to assured BW
Allacated
Allacated from
from surplus
surplus BW
BW after
after non
non assured
assured bandwidth
bandwidth
Best
Best Effort
Effort Bandwidth
Bandwidth Not guaranteed
Not guaranteed
BW configuration
Bandwidth
Bandwidthparameters
parameters
(1)Fixed
(1)FixedBandwidth（FXB）
Bandwidth（FXB）
(2)Assured
(2)AssuredBandwidth
Bandwidth（ASB)
（ASB)
(3)Maximum
Bandwidth
(3)Maximum Bandwidth（MAB)
（MAB)
GPON
Upstream
Total
Bandwidth
Best Effort
Non-assured
ΣAssured
Σ Fixed
traffic →
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Σ： ONU summation
43
Contents
1
Optical Access System Market
2
G-PON and Standardization
3
Implementation of G-PON System
and Service
4
Towards future -10G-PON-
PON Roadmap
•
•
From Business/specific use To FTTH.
long (more than 8 years) development and continuous investment to PON
Bit
Rate
(bit/s)
Deployed in Japan
for business service
Deployed in Japan, Australia,
and the US for FTTH service
Residential/SOHO
1G
ATM-PON
[150Mbit/s]
100M
10M
B-PON
[150Mbit/s]
ITU-T G.983.1
B-PON
[620Mbit/s]
ITU-T G.983.1
IEEE E-PON
[1Gbit/s]
IEEE
802.3ah
G-PON
[2.4Gbit/s]
ITU-T G.984
STM-PON
[10Mbit/s]
Proprietary
specifications
1996
1998
Products based on
international standards
2000
2002
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2004
2006
Year
45
PON Roadmap 2
(bit/s)
10G
NG PON
[10Gbit/s]
GPON
GPON [2.4Gbit/s]
[2.4Gbit/s]
1G
B-PON
B-PON [622Mbit/s]
[622Mbit/s]
100M
IEEE
IEEE E-PON
E-PON [1Gbit/s]
[1Gbit/s]
ATM-PON
ATM-PON [156Mbit/s]
[156Mbit/s]
10M
1998
2000
2002
2004
2006
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2008
2010
2012
46
10G PON Requirements
Existing fiber plant ( Conventional SMF)
Distance 20km
Loss budget 29dB(class B+)
e.g.
– 20 km optical fiber (10dB loss at 0.5dB/km)
– 1x32 optical split (more than 15dB)
→study required on Optical power budget and dispersion
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47
Study item on １０Ｇ Optical Access
64 x Impact of dispersion 10G vs 1.25G(Downstream)
Economical external modulator is required
Correlation between dispersion in the ONT and transmission range (SMF)
1x32 dispersion
Distance
1550nm Direct modulation (DFB)
Dispersion limit@ 1.25Gbps
640km
Loss budget:29dB，
Fiber loss: 0.5dB/km
1550nm External modulation
Dispersion limit @ 10Gbps
Lo
60km
40km
ss
lim
it
20km
10km
1
10
(Cl
a
ss
B
100
1550nm Direct modulation (DFB)
Dispersion limit @ 10Gbps
+)
1000
# of ONTs
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48
10G TDM PON optical components
Plan １
Downstream:
1.49μm
Upstream:
1.3μm
Plan ２
OLT
ONU
OLT
(A)
(B)
EA-DFB
APD+FEC
EA-DFB
+SOA
(C)
(D)
APD+FEC
APD+FEC
ONU
PD+FEC
DFB
DFB
Loss Budget 29dB (～20km )
OLT
WDM
Driver
Data
IN
Data
OUT
1X32 splitter
ONU
WDM
(A)
F
E
C
(C)
Preamp
Driver
(B)
10Gbps
10Gbps
Downstream 1.49μm
F
E
C
(D)
Data
IN
Data
OUT
Preamp
Upstream 1.3μm
*1 QD-LD: quantum dot laser
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49
Next Generation Access discussion in FSAN
NGA(Next Generation Access ) target
WDM-PON, 10G-PON, enhanced GPON
NGA should co-exist with existing PON by WDM
Optical
Distribution
Network
CO
Basicband
Service
OLT
WDM
ODN
Enhancement-band
Service
Customer Premises
A
ONT
WDM
User
Interface #1
“Enhancement band ready”
B
Blocking
filter
NGNG-PON using WDM
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ONT
User
Interface #1
50
PON Wavelength Plan Discussion
1290-1330nm for DFB laser
1300-13200nm for enhanced
Upstream Band
1200
1260
Enhanced option 1
1300
1360
1400
Enhancement
Band
Downstream
Basic Band
1480
1500
1600
Enhanced option 2
lower:1530
upper:1580-1620
Upstream Data
(GPON)
Downstream Data
(GPON)
RF Video Distribution
(1550-1560: Enhanced option 3)
λ1=1480nm
λ2=1500nm
Based on ITU-T Recommendation G.984.enh discussion
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51
Summary
G-PON for IP-TV deployment
G-PON characteristics
Broadband, Multi-service, OAM, Interoperability
Next generation access(including 10G) will co-exist
with G-PON
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52