《光纤通信课程设计》课件Class5-03

FSAN GPON CTS
7th GPON Interop Event
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4
5
6
78
9
FSAN
GPON TC (G.984.3) published
begins NG-PON 1st GPONG.984.5
Interop Evepnutblished
IEEE begins
GPON IEEE
many types of PONs have been defined APON ATM PON BPON Broadband PON GPON Gigabit PON EPON Ethernet PON GEPON Gigabit Ethernet PON CPON CDMA PON WPON WDM PON
Max 64 way split [constrained by PMD attenuation limits]
LU #1
ONT
G-PON
ITU-T G.984.x
Fiber
splitter
LU #N, N ≤64
TXR
EPON
• 1250 Mbps/1250 Mbps [~850 Mbps effective payload rate])
Class 5
X. Wu, M. J. Li, H. M. Yan Dept. of Opt. Engr., ZJU
2011
•Motivation and Background •FTTx approaches
• Point-to-point • AON • TDM-PON (BPON, EPON,GPON) • WDM-PON •Exercise
ONT Bitrate 2
Fixed* or adaptable optics
Wavelength selection here
* “Fixed” optics might be a cost reduced version of convention DWDM long-haul optics NOTE: Most believe adaptable optics will be required for a practical WDM-PON system
1995 ‘9 ‘9 2000
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89
1
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2
3
FSAN
BPON
founded (ITU G.983.1)
published
BPON IEEE OMCI EPON (G.983.2) begins published
FSAN BPON begins OMCI GPON (G.983.2)
Revised
OLT
wavelength splitter
Feeder Fiber 1 to N ls on single fiber
Hybrid WDM-PON example
TDMA
power splitter
dedicated l1 pair
ONT (Fixed Optics)
ONT Bitrate 1
dedicated l2 pair
ONT1
Data
ONT2
1:32 Optical splitter
(or 1:64 for shorter reaches or with Reach Extender)
VOIP
E1/T1/ Telephowk.baidu.comy
Video
TDM TDMA CC NB BB OLT ONT
Time Division Multiplex Time Division Multiple Access Cross Connect Narrow Band Broadband Optical Line Termination Optical Network Termination
in this course we will focus on GPON and EPON (including GEPON) with a touch of BPON thrown in for the flavor
PON Technologies: OCDMA
• OCDMA (Optical Code Division Multiple Access)
C1
Data source
Ci
Cn
Opt enc
- Spread spectrum - Frequency hopping - OOC( Optical Orthogonal Coding )
-OBI
CiCi N
CiC j
C1
Data recovery
Ci
Cn
Opt dec
x-PON Technology Time Line
G.984.5
Regular (FP)
Reduce (DFB) or Narrow (CWDM) or
NG-PON (G.9xx) A
NG-PON Option 1 *
B
C
NG-PON Option 2**
D
Legend:
GPON Up
RF Overlay
GPON Dn
NG-PON
* Requires the use of reduce water peak fiber (G.652.C/D) ** the upper-limit value is determined as an operator choice from 1580 to 1625 nm
Downstream (single -fiber systems): Upstream: RF video (if present)
1490 nm 1310 nm 1555 nm
Access Node
E1/DS1
(and/or) GbE STMn/OCn
NB BB
CC OLT
TDM TDMA
E1/DS1/ Telephony
Burst-Mode Transmitter in ONU
OLT Burst-Mode Receiver
Burst-Mode CDR
Sampling
Ideal sampling instant
Hysteresis
Superimposed interference Ideal, error-free transmission
Up to 60 km* physical reach
(* with G.984.6 Reach Extender)
ONT32
PONs are (in some sense) like HFC systems – shared medium
POTS Data
Example of WDM-PON
Access node SNI
Range Budget: ~11Km
Relationship between transmission distance and number of splits
PON physical layer
l allocations - G.983.1
Upstream and downstream directions need about the same bandwidth US serves N customers, so it needs N times the BW of each customer
Present Future
TDM PON Architecture and Technologies
OLT
TXR
BPON
20 km Maximum Reach
20 km ONU differential range
•Typically: 622 Mbps/155 Mbps (down/up)
Max 32 way split (may be cascaded)
OLT implementations may not necessarily support all PON technologies indicated
Typical PON Configuration and Optical Packets
Eye diagram of ONU transceiver in burst mode operation
•ATM-based transport
B-PON
ITU-T G.983.x
Fiber
splitter
LU #1
ONT
LU #N, N ≤32
TXR
GPON
• Typically: 2488/1244 Mbps • GFP-like transports (Ethernet, and/or TDM)
TDM PON Example
• Downstream – TDM transmission with multiple “listeners” (encryption to insure privacy)
• Upstream – TDMA transmission with upstream transmissions (bursts) scheduled to prevent overlap
•FTTx = Fiber-to-the-x • FTTH - Home • FTTC - Curb • FTTN - Node or Neighborhood • FTTP - Premise • FTTB - Building or Business • FTTU - User • FTTZ - Zone • FTTO - Office • FTTD - Desk
10GEPON
OMCI
802.3ah
(G.984.4) (EPON)
published published
G.984.1, G.984.3 G.984.4 Rev2 published
G.984.2 amd2, G.984.6 published
BPON Completed: April 2000
GPON Completed: June 2004
Example: GPON 1310nm
} Power: 0dbm Single-mode fiber
Sensitivity: -23dbm
Link Budget: 23db
Typical Range Calculation
Assume: Optical loss = 0.35 db/km Connector Loss = 2dB Splitter Insertion Loss 1X32 = 17dB
BPON 1st Interop Event: March 2004
GPON 1st Interop Event: Jan 2006
BPON 1st wide-scale deployment: May 2004 GPON 1st wide-scale deployment: 4Q 2007
GPON Specs focused & enhanced: 3Q07-1Q08
O-band
E-band
S-band
C-band L-band
U-band
G.984.2
1260 1280 1300 1320 1340 1360 1380 1400 1420 1440 1460 1480 1500 1520 1540 1560 1580 1600 1620 1640 1660 1680
• Ethernet-based transport
E-PON
1000BASE-PX20 per IEEE 802.3ah
Max 32 way split (16-way specified in standard)
Fiber
splitter
LU #1
ONT
LU #N, N ≤32
Network optical transceiver (TXR) shared by “N” subscribers
TDMA
power splitter
ONT (Fixed Optics)
Colorless ONTs: Transmitter and Receiver front-end filter characteristics are wavelength adaptable
New Features/Functions: Enhancement Band – G.984.5 Wavelength Plan
Transceiver Block Diagram
Optical Splitters
Optical Protection Switch Optical Splitter
Budget Calculations
LB = ‫ ׀‬PS ‫ ׀‬- ‫ ׀‬PO ‫׀‬
LB = Link Budget PS = Sensitivity PO = Output Power