Next Generation PON System -Access Platforms … Generation PON...1 Next Generation PON...
Transcript of Next Generation PON System -Access Platforms … Generation PON...1 Next Generation PON...
1
Next Generation PON System-Access Platforms Integration-Next Generation PON System-Access Platforms Integration-
Feb. 25, 2008Akio Tajima
System Platforms Research Labs, NEC Corporation
Page 2 OFC2008 San Diego
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 3 OFC2008 San Diego
NGA FSAN, ITU-T10GE-PON
IEEE802.3
Optical Access Technology Evolution
STMPON
2005
bit / s
2006
G-PON
FSAN, ITU-T
100K
1M
10M
100M
1G
600MB-PON
Year2000 20011997
FSAN, ITU-T
FSAN, ITU-T
2003
150MB-PON
2002 2004
GE-PON IEEE802.3
STMPON
2007 2008 2009 2010
10G
Telephone
StillImage
Tele conference
Broadcast HDTV
RealisticCommuni
cation
•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.
TDM
100G
WDM, etc.JapanTrial 1980’s~Commercial 1997~
•Bandwidth/capacity is increasing.•We can now fully enjoy the benefits of Gigabit class service.
Page 4 OFC2008 San Diego
Broadband Subscribers in Japan
0.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
03 04 05 06 07 08 09 10 11 12Year
Subscri
bers
(M
illions) FTTH
DSL
CATV
FWA
Source: Ministry of Internal Affairs and Communication of Japanand Yano Research Institute, Ltd. November 2007
•Broadband subscriber is steadily increasing.•FTTH subscriptions surpass 10 Million (Sept. 2007)•Meanwhile, DSL subscriptions declined.
Forecast
>10M
Total 27.8M>18M
Page 5 OFC2008 San Diego
Current Optical Access Architecture
ONU
ONUVDSL
Optical Splitter
Central Office
PON OLT
Media ConvertersApartment
Consumer Service
Leased line
ONU
Business Service
Single star
PON
Wireless Service Mobile base
station
Plural users share fiber and OLT.
Page 6 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 7 OFC2008 San Diego
Requirements and Key Technologies for NGARequirements Key Technologies
• Higher bandwidth/capacity than current system
• Coexistence with installed system
• Maximum utilization of installed Optical Distribution Network (ODN).
• Limited floor in CO• Limited power supply in CO
• Wider coverage area• Fixed and wireless integration
• Higher Reliability• Security
• 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 (10GE-
PON system)
• WDM repeater• FTTx/Wireless Integration
• FTTx/WiMAX Protection• Cryptosystem (e.g. QKD)
Page 8 OFC2008 San Diego
IP-TV Service Trend
Source: http://www.ieee802.org/3/cfi/0306_1/cfi_0306_1.pdf
Require much more bandwidth
Page 9 OFC2008 San Diego
Maximum utilization of installed ODNCoexistence 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 10 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– 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
Femte Cell
Page 11 OFC2008 San Diego
Requirements and Key Technologies for NGARequirements Key Technologies
• Higher bandwidth/capacity than current system
• Coexistence with installed system
• Maximum utilization of installed Optical Distribution Network (ODN).
• Limited floor in CO• Limited power supply in CO
• Wider coverage area• Fixed and wireless integration
• Higher Reliability• Security
• 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 (10GE-
PON system)
• WDM repeater• FTTx/Wireless Integration
• FTTx/WiMAX Protection• Cryptosystem (e.g. QKD)
Page 12 OFC2008 San Diego
Access Platforms Integration over 10GEPON
ONU
ONUVDSL
Central Office
PON OLT
Apartment
Consumer Service
Leased line
ONU
Business Service
Wireless Service Mobile base
station
xDSL/POTS/WirelessAccess over 10GEPON
WDM AccessTransport
WDM AccessTransport
10Giga PON Integrate subscriber
FTTx/WiMAX solution to provide high reliability and extend reach.
WDM access transport to extend reach and provide wider bandwidth.
Page 13 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 14 OFC2008 San Diego
Standard Schedule2007 2008 2009 2010~▼D1.0
▼D2.0
▼D3.0
▼Standard
Baseline•PMD Spec.
-Power Budget-Wavelength-FEC
MayLast Feature
IEEE802.3av10GEPONCFI Mar. 06TF Sep. 06
JulyNov. Jan. Sep.▼D1.1
Feb.Nov.Last TechnicalChange
Extension, Option •MPCP Extension•U/S 1G/10G Coexistence
FSAN/ITU-TNGA
Development of FSAN NG-PON white paper• Requirements for NG-PON1/2• Specifications for NG-PON1• Initial studies of NG-PON2
Joint Meeting for
Harmonization
NG-PON1 Standardizationin conjunction with ITU-T
Continuation to study NG-PON2 (tentative)
WDM-PONXG-PON
Long-reach
TechnicalDiscussion
TechnicalDiscussion
Page 15 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 1:32, and distances of at least 10 and at least 20 km.
PR: 10G/10G
PRX:10G/1G
Table: Power Budget Classes
Page 16 OFC2008 San Diego
Downstream: WDM
10GEPON –Features-
10G/1G
ONU1
Loss budget = 29 dB (PR30/PRX30)
CO10G/10G
1260 1310 1360
GE-PON (US)
10GE-PON (US)1260 1280
1360
GE-PON (DS)Video
1450 1500 1550 1600λ
1480 1500
1574 1580
(nm)
1600PR30
PR10PR20
Upstream: TDMA
ONU2
10GE-PON (DS)
1G/10GDual-rate
Rx
Tx
Key Device: High-sensitivity APD, High-Power LD
Coexistence with GEPON, RF-video
Tx:>+4dBmRx:<-28dBm
Rx:<-26dBmTx:>+2dBm
Wavelength Allocation
Page 17 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 18 OFC2008 San Diego
Key Device for 10GEPON High-Power Transmitter
+4dBm(Modulation)
High-power (>+4dBm)10Gbps operation was confirmed.
1.3um AlGaInAs BH DFB-LD– AlGaInAs MQW
• High relaxation oscillation frequency even at high temperature
– BH structure with semi-insulating current blocking layer
• Reduce parasitic capacitance by Fe doped InP for high-speed (>10GHz) operation
Page 19 OFC2008 San Diego
Key Device for 10GEPON High-Performance Receiver• Two type of high-
performance APD have developed.– Mesa-type APD
• Simple Mesa structure is suitable for mass production and low cost.
• Tolerant for high-power.
• High reliability.
– Waveguide APD
• Waveguide structure realizes high quantum efficiency and high sensitivity.
• WG structure is suitable for surface mounting and PLC.
A back-illuminated mesa APD.High reliability with thin multiplicationand two-step absorption layer.
An asymmetric waveguide APD with thin SAM structure. High input poweroperation with asymmetric structure.
Frequency Response
Received Sensitivity
Radiation mode
Band Structure
*SAM:Separated absorption and multiplication structure
Mesa InAlAs-APD
WG InAlAs-APD
Input light
reflectionp-electrode n-electrode
AR coat (SiN)
n-InP Sub.
InAlAs muliplication layer
n-InP buffer layer
i-InGaAs absorption layer
p- graded doping InGaAsabsorption layer
Field buffer layer
p-InAlAs cap layer
Passivation (SiN)
n-InP buffer layer
Input light
reflectionp-electrode n-electrode
AR coat (SiN)
n-InP Sub.
InAlAs muliplication layer
n-InP buffer layer
i-InGaAs absorption layer
p- graded doping InGaAsabsorption layer
Field buffer layer
p-InAlAs cap layer
Passivation (SiN)
n-InP buffer layer
GB:120 GHzfmax: 11 GHz
Multiplication factor (M)
3-dB
dow
n ba
ndw
idth
(GH
z)
1 10 1001
10
100
GB:120 GHzfmax: 11 GHz
Multiplication factor (M)
3-dB
dow
n ba
ndw
idth
(GH
z)
1 10 1001
10
100
p-electrode
i-InGaAs absorption layerInAlAs field buffer layerInAlAs multiple layer
S.I.-InP substrate
n-electrode
AR-coating
Input light
Poly-imide
p+-waveguide
n+-waveguide
p-electrode
i-InGaAs absorption layerInAlAs field buffer layerInAlAs multiple layer
S.I.-InP substrate
n-electrode
AR-coating
Input light
Poly-imide
p+-waveguide
n+-waveguide
Page 20 OFC2008 San Diego
Colorless ONU Technology for WDM-PON
DirectExternalDirectDirect/ExternalModulation
1.25Gbps10Gbps1.25Gbps10GbpsRate
ONUOLTONUONULocation of US light source
ONU configuration
Wavelength-seeding
Loop-backSpectrum Slicing
TunableTechnique
Wavelength SupplyLocal Emission
Rx
TLD
WDMRx
BLS
WDMRx
Mod.+Amp.
WDMRx
RSOA
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 21 OFC2008 San Diego
Full band Tunable LD
SOA
Double-ring resonator
TO heater(on the ring waveguide)
AR coating
HR coating
160nm
-50
-40
-30
-20
-10
0
10
1460 1500 1540 1580 1620 1660
Wavelength [nm]
Fib
er
co
upl
ed
inte
nsi
ty [
dBm
] S-band C-band L-band
0
40
80
120
160
200
1990 1994 1998 2002 2006
Year
Tu
nin
g ra
nge
[n
m]
Page 22 OFC2008 San Diego
WDM Access Transport System
CO sideWDM repeater
CPE sideWDM repeater
OLTONU
ONU
ONU
Multiple wavelengths over single fiber
Extend reach (20km)
• 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
Page 23 OFC2008 San Diego
FTTx/ WiMAX Protection•Optical access will become social infrastructure•High reliability, at the same time low-cost is indispensable
Page 24 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
• I believe that these technologies lead to realizing 10GEPON-based integrated optical access.
Page 25 OFC2008 San Diego
For “Next” Next Generation Access
1260 1310 1360
GE-PON (US)
10GE-PON (US)1260 1280
1360
GE-PON (DS)Video
1450 1500 1550 1600λ
1480 1500
1574 1580
(nm)
1600PR30
PR10PR20
10GE-PON (DS)
Wavelength for “Next” NGA
•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 26 OFC2008 San Diego
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 PON2nd step: WDM PON
10Gbps/λ x ΝNGA FSAN, ITU-T10GE-PON
IEEE802.3
STMPON
2005
bit / s
2006
G-PON
FSAN, ITU-T
100K
1M
10M
100M
1G
600MB-PON
Year2000 20011998
FSAN, ITU-T
FSAN, ITU-T
2003
150MB-PON
2002 2004
GE-PON IEEE802.3
STMPON
2007 2008 2009 2010
10G
TDM
100G
WDM, etc.