Next Generation PON System
-Access Platforms IntegrationFeb. 25, 2008
Akio Tajima
System Platforms Research Labs,
NEC Corporation
1
Outline
1. Optical Access Technology and market
2. Next Generation Access (NGA)
1. Requirements for NGA
2. NGA Standardization Status
– Topics, Direction, Status, Feature
3. R&D activities in NEC group
1. Key optical devices for NGA(10G, WDM)
2. WDM Access Transport System
3. OWI Protection
4. Summary
Ｐage 2
OFC2008 San Diego
Optical Access Technology Evolution
•Optical access technology enables HDTV distribution to home.
•Higher bandwidth/capacity more than Giga PON technologies
make it possible to come in new attractive services.
Tele
phone
Still
Image
Tele
conference
Broad
cast
HDTV
Realistic
Communi
cation
bit / s
100G
10G
1G
NGA FSAN, ITU-T
Japan
Trial 1980’s~
Commercial 1997~
10GE-PON
G-PON
IEEE802.3
GE-PON
IEEE802.3
100M
150M
B-PON
10M
600M
B-PON
STM
STM
PON
PON
1M
Ｐage 3
2000
M
TD
FSAN, ITU-T
FSAN, ITU-T
2001
2002
FSAN,
ITU-T
100K
1997
M
D
W
c.
t
e
,
2003
2004
•Bandwidth/capacity is increasing.
•We can now fully enjoy the benefits of
Gigabit class service.
2005
2006 2007
OFC2008 San Diego
2008 2009 2010
Year
Subscribers (Millions)
Broadband Subscribers in Japan
45.0
40.0
35.0
30.0
25.0
20.0
15.0
10.0
5.0
0.0
Source: Ministry of Internal Affairs and Communication of Japan
and Yano Research Institute, Ltd. November 2007
Forecast
FTTH
DSL
CATV Total 27.8M
FWA
>18M
>10M
03 04 05 06 07 08 09 10 11 12
Year
•Broadband subscriber is steadily increasing.
•FTTH subscriptions surpass 10 Million (Sept. 2007)
•Meanwhile, DSL subscriptions declined.
Ｐage 4
OFC2008 San Diego
Current Optical Access Architecture
PON
Optical
Splitter
ONU
Plural users share fiber
and OLT.
Central Office
Consumer
Service
PON OLT
VDSL
ONU
Leased
line
Apartment
Business
Service
Wireless
Service
Ｐage 5
Single star
ONU
Mobile base
station
OFC2008 San Diego
Media
Converters
Outline
1. Optical Access Technology and market
2. Next Generation Access
1. Requirements for NGA
2. NGA Standardization Status
– Topics, Direction, Status, Feature
3. R&D activities in NEC group
1. Key optical devices for NGA(10G, WDM)
2. WDM Access Transport System
3. OWI Protection System
4. Summary
Ｐage 6
OFC2008 San Diego
Requirements and Key Technologies for NGA
Requirements
•
•
•
Key Technologies
Higher bandwidth/capacity than
current system
Coexistence with installed
system
Maximum utilization of installed
Optical Distribution Network
(ODN).
•
•
•
TDM (e.g. 10Gbps/λ)
WDM (e.g. colorless ONU)
Dual-rate Burst Receiver
•
High-power optical transmitter and
high-sensitivity optical receiver for
higher-speed (10Gbps) transmission.
FEC
Integrated access platforms (10GEPON system)
•
•
•
•
Limited floor in CO
Limited power supply in CO
•
•
Wider coverage area
Fixed and wireless integration
•
•
WDM repeater
FTTx/Wireless Integration
•
•
Higher Reliability
Security
•
•
FTTx/WiMAX Protection
Cryptosystem (e.g. QKD)
Ｐage 7
OFC2008 San Diego
IP-TV Service Trend
Require much more bandwidth
Source: http://www.ieee802.org/3/cfi/0306_1/cfi_0306_1.pdf
Ｐage 8
OFC2008 San Diego
Maximum utilization of installed ODN
Coexistence with current system
1. Compatible fiber plant with current
system
–
Fiber plant which is constructed for current
system, must be used for NGA.
•
•
•
•
G.652 SMF
Power budget (30 dB and penalty < 1 dB, or 29 dB
without penalty)
20km reach
More than 32 split ratio
2. Coexistence with current system.
NGA must avoid to interfere with existing
current system in a same fiber.
– Optical overlay of RF video must be also
supported.
Source: http://www.ieee802.org/3/10GEPON_study/public/may06/otaka_1_0506.pdf
–
Ｐage 9
OFC2008 San Diego
Optical Access For Wireless Back-Haul
• 4th Gen mobile communication will be
ubiquitous
– Bandwidth: ~30Mbps/user, 100M~1Gbps/access
point
– Access point coverage will decrease
Femte Cell
– Number of access points will increase
– PON is a natural back-haul solution for the 4th Gen
access points
• Next generation wireless back-haul
– 802.11n: up to 100 Mbps per device
– 802.16e: up to 70 Mbps per access
point
Source: http://www.ieee802.org/3/cfi/0306_1/cfi_0306_1.pdf
Ｐage 10
OFC2008 San Diego
Requirements and Key Technologies for NGA
Requirements
•
•
•
Key Technologies
Higher bandwidth/capacity than
current system
Coexistence with installed
system
Maximum utilization of installed
Optical Distribution Network
(ODN).
•
•
•
TDM (e.g. 10Gbps/λ)
WDM (e.g. colorless ONU)
Dual-rate Burst Receiver
•
High-power optical transmitter and
high-sensitivity optical receiver for
higher-speed (10Gbps) transmission.
FEC
Integrated access platforms (10GEPON system)
•
•
•
•
Limited floor in CO
Limited power supply in CO
•
•
Wider coverage area
Fixed and wireless integration
•
•
WDM repeater
FTTx/Wireless Integration
•
•
Higher Reliability
Security
•
•
FTTx/WiMAX Protection
Cryptosystem (e.g. QKD)
Ｐage 11
OFC2008 San Diego
Access Platforms Integration over 10GEPON
FTTx/WiMAX solution to provide
high reliability and extend reach.
10Giga PON Central Office
Integrate
subscriber
ONU
Consumer
Service
VDSL
Apartment
Business
Service
Wireless
Service
Ｐage 12
PON OLT
ONU
Leased line
WDM Access
Transport
WDM Access
Transport
ONU
Mobile base
station
OFC2008 San Diego
WDM access
transport to extend
reach and provide
wider bandwidth.
xDSL/POTS/Wireless
Access over 10GEPON
Outline
1. Optical Access Technology and market
2. Next Generation Access
1. Requirements for NGA
2. NGA Standardization Status
– Topics, Direction, Status, Feature
3. R&D activities in NEC group
1. Key optical devices for NGA(10G, WDM)
2. WDM Access Transport System
3. OWI Protection System
4. Summary
Ｐage 13
OFC2008 San Diego
Standard Schedule
2007
IEEE802.3av
10GEPON
2008
▼ Nov. ▼ Feb.▼July
D2.0
D1.0 D1.1
May
Last
Feature
CFI Mar. 06
TF Sep. 06
Baseline
Technical
Discussion
FSAN/ITU-T
NGA
2009
▼Jan. ▼ Sep.
D3.0
Standard
Nov.
Last Technical
Change
Extension, Option
•PMD Spec.
•MPCP Extension
-Power Budget •U/S 1G/10G Coexistence
-Wavelength
Joint Meeting
-FEC
for
Harmonization
Development of FSAN NG-PON
white paper
• Requirements for NG-PON1/2
• Specifications for NG-PON1
• Initial studies of NG-PON2
Technical
Discussion
Ｐage 14
2010~
Long-reach
Continuation to study NG-PON2
(tentative)
NG-PON1 Standardization
in conjunction with ITU-T
WDM-PON
XG-PON
OFC2008 San Diego
10GEPON –Objectives•
Support subscriber access networks using point to multipoint
topologies on optical fiber
•
PHY(s) to have a BER better than or equal to 10-12 at the PHY
service interface
•
Provide physical layer specifications:
– PHY for PON, 10 Gbps downstream/1 Gbps upstream, single SM
fiber
– PHY for PON, 10 Gbps downstream/10 Gbps upstream, single SM
fiber
•
Define up to 3 optical power budgets that support split
ratios of 1:16
and Power
1:32, and
distances
of at least 10 and at
Table:
Budget
Classes
least 20 km.
PR: 10G/10G
PRX:10G/1G
Ｐage 15
OFC2008 San Diego
10GEPON –FeaturesTx:
10G/10G
>+4dBm
Rx:
ONU1
<-28dBm
Coexistence with GEPON, RF-video
Upstream: TDMA
CO
1G/10G
Dual-rate
Rx
Tx
10G/1G
ONU2
Downstream: WDM
Loss budget = 29 dB (PR30/PRX30)
10GE-PON (US)
Wavelength Allocation
1280
1260
GE-PON (US)
1360
1260
1310
1360
GE-PON (DS)
1480
1450
1500
1500
10GE-PON (DS)
1580
PR30 1600
1574
Video
1550
PR10
PR20
λ
1600 (nm)
Key Device: High-sensitivity APD, High-Power LD
Ｐage 16
Rx:
<-26dBm
Tx:
>+2dBm
OFC2008 San Diego
Outline
1. Optical Access Technology and market
2. Next Generation Access
1. Requirements for NGA
2. NGA Standardization Status
– Topics, Direction, Status, Feature
3. R&D activities in NEC group
1. Key optical devices for NGA(10G WDM)
2. WDM Access Transport System
3. OWI Protection System
4. Summary
Ｐage 17
OFC2008 San Diego
Key Device for 10GEPON High-Power Transmitter
1.3um AlGaInAs BH DFB-LD
– AlGaInAs MQW
• High relaxation
oscillation frequency even
at high temperature
– BH structure with semiinsulating current blocking
layer
• Reduce parasitic capacitance
by Fe doped InP for highspeed (>10GHz) operation
+4dBm
(Modulation)
High-power (>+4dBm)10Gbps operation was confirmed.
Ｐage 18
OFC2008 San Diego
• Two type of highperformance APD have
developed.
p-InAlAs cap layer
p- graded doping InGaAs
absorption layer
i-InGaAs absorption layer
Field buffer layer
InAlAs muliplication layer
n-InP buffer layer
Band Structure
– Mesa-type APD
Input light
AR coat (SiN)
n-InP Sub.
• Simple Mesa structure
is suitable for mass
production and low cost.
• Tolerant for high-power.
• High reliability.
3-dB down bandwidth (GHz)
Key Device for 10GEPON High-Performance Receiver
100
fmax: 11 GHz
GB:120 GHz
10
1
1
10
100
Multiplication factor (M)
n-InP buffer layer
Frequency Response
Passivation (SiN)
reflection
p-electrode
n-electrode
Mesa InAlAs-APD
p-electrode
n-electrode
– Waveguide APD
A back-illuminated mesa APD.
High reliability with thin multiplication
and two-step absorption layer.
Poly-imide
p+-waveguide
• Waveguide structure
realizes high quantum
efficiency and high
sensitivity.
• WG structure is
suitable for surface
mounting and PLC.
Ｐage 19
n+-waveguide
Input light
i-InGaAs absorption layer
InAlAs field buffer layer
InAlAs multiple layer
AR-coating
S.I.-InP substrate
Radiation mode
WG InAlAs-APD
OFC2008 San Diego
Received Sensitivity
An asymmetric waveguide APD with
thin SAM structure. High input power
operation with asymmetric structure.
*SAM：Separated absorption and
multiplication structure
Colorless ONU Technology for WDM-PON
Local Emission
Technique
ONU
configuration
Tunable
WDM
Wavelength Supply
Spectrum
Slicing
WDM
Loop-back
Wavelengthseeding
WDM
Rx
Rx
Rx
Rx
TLD
BLS
Mod.
+Amp.
RSOA
Modulation
Direct/External
Direct
External
Direct
Rate
10Gbps
1.25Gbps
10Gbps
1.25Gbps
Location of US
light source
ONU
ONU
OLT
ONU
TLD: Tunable Laser Diode, BLS: Broadband Light Source, RSOA: Reflective Semiconductor
Optical Amplifier
Source: J. Kani et al., “Next Generation Optical Access Networks: Possible Directions
and Technical Challenges,” ECOC2006, Th2.1.2
Ｐage 20
OFC2008 San Diego
Full band Tunable LD
AR coating
Double-ring resonator
SOA
HR coating
TO heater
(on the ring waveguide)
160nm
S-band
C-band
200
L-band
0
T u n in g r a n g e [ n m ]
F ib e r c o u p le d in t e n s it y [ d B m ]
10
-10
-20
-30
-40
-50
1460
Ｐage 21
1500
1540
1580
Wavelength [nm]
1620
1660
160
120
80
40
0
1990
OFC2008 San Diego
1994
1998
Year
2002
2006
WDM Access Transport System
• WDM access transport to extend reach and provide wider
bandwidth
• The system multiplexes burst optical signal and behaves
as a repeater as well.
– Effective use of access network fiber by reducing number of fibers
– Extend optical reach beyond 20km with using repeaters to 60km
– Compatible in mixed deployment with PON, point-to-point or other
systems
Extend reach (20km)
OLT
ONU
CPE side
WDM repeater
CO side
WDM repeater
ONU
ONU
Multiple wavelengths
over single fiber
Ｐage 22
OFC2008 San Diego
FTTx/ WiMAX Protection
•Optical access will become social infrastructure
•High reliability, at the same time low-cost is indispensable
Ｐage 23
OFC2008 San Diego
Summary
•
Requirements and trends for next
generation optical access technologies
are presented.
1. Requirements for NGA
2. NGA Standardization Status
•
R&D activities in NEC are introduced.
1. Key optical devices for NGA
2. WDM Access Transport System
3. OWI Protection System
•
Ｐage 24
I believe that these technologies lead to
realizing 10GEPON-based integrated
optical access.
OFC2008 San Diego
For
“Next” Next Generation Access
Wavelength for “Next” NGA
10GE-PON (DS)
10GE-PON (US)
1280
1260
GE-PON (US)
1360
1260
1310
1360
GE-PON (DS)
1480
1450
1500
1500
1574
Video
1580
PR30
1600
PR10
PR20
1550
1600 (nm)
•New technologies (e.g. OFDM, OCDM) are expected for
realizing more higher bandwidth and flexibility.
•However, it is difficult to remove legacy system
•Coexistence architecture with legacy system is desired
•Coexistence technology will be technical issues.
Ｐage 25
OFC2008 San Diego
λ
For Higher Capacity
• In order to enlarge bandwidth/capacity, we have
options, WDM, TDM and etc.
• Now 10Gbit/s continuous transmission technology is
mature, e.g. 10Gigabit Ethernet.
• TDM, especially 10Gbit/s PON technologies will be
available around 2010.
1st step: 10Gbit/s PON
2nd step: WDM PON
10Gbps/λ x Ν
bit / s
100G
NGA FSAN, ITU-T
10GE-PON
10G
G-PON
1G
IEEE802.3
GE-PON
IEEE802.3
100M
150M
B-PON
10M
600M
B-PON
ST
M
STM
PPON
ON
1M
M
WD
c.
t
e
,
FSAN, ITU-T
M
TD
FSAN, ITU-T
FSAN, ITU-T
100K
1998
Ｐage 26
2000
2001
2002
2003
2004
2005
2006 2007
2008 2009 2010
OFC2008 San Diego
Y ear