Four Candidate NG-EPON Solutions
Transcript of Four Candidate NG-EPON Solutions
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Four Candidate
NG-EPON Solutions
Huawei Technologies
Jan., 2014
Authors: Shengping Li & Wei Lin
Presenter: Duane Remein
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Content
Evolution Roadmap Overview – all possibilities
Candidate A: TDM-PON
Candidate B: TWDM-PON
Candidate C: WDM PON
Candidate D: OFDM PON
Discussion and Summary
Slide 2
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All possible directions
TWDM PON
N x 10G-EPON
TDM
1G 10G ?G
TDM ×WDM
WDM
bandwidth
Access tech
no
logies
EPON
WDM PON
N wavelengths
FDM OFDM PON
N Channels
10G-EPON TDM PON
?G-EPON
?
?
?
?
Slide 3
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Candidate A: TDM-PON
40Gb/s D/S
40Gb/s based on 25G optical components (25G EML TOSA and 25G APD ROSA)
with complex modulation (PAM-4 or Duo-binary).
10Gb/s U/S
10Gb/s, re-use commercial 10G-EPON optical component
TDMA, with NRZ modulation.
40G/10G TDM-PON reference architecture
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Candidate A: TDM-PON (cont.)
Pros
Compatible with power-splitter based ODN
Smooth migration from 1G/10G-EPON
No complex wavelength configuration
Coexistence with legacy 1G/10G-EPON, WDMA for D/S, TDMA for U/S
Cons
At 40Gb/s, chromatic dispersion (CD) is a critical issue. 16x CD and 4x PMD larger than 10G for NRZ .
Low power budget
High peak data rate per ONU and low date efficiency.
EPON ONU …
NG EPON
ONU
10G EPON
OLT
NG EPON
OLT
10G EPON
ONU
… NG EPON
ONU
NG EPON
OLT
EPON OLT
EPON ONU
Smooth migration: replacing the EPON, 10G-EPON OLT and ONU optical modules by NG-EPON
Slide 5
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Candidate B: TWDM-PON
TWDM-PON
ODN
OLT
splitter
UNI
SNI
Access Network (AN) [ITU-T G.902]
MAC
ONU
MAC
ONU
MAC
ONU
MAC
ONU
MAC
WD
M
MU
XW
DM
M
UX
40Gb/s or 100Gb/s D/S
N ʎs stacked EPON with WDM Mux.
N DFB laser array at OLT.
NRZ.
RX with Tunable filter at ONU to receive the assigned
wavelength.
10 Gb/s or 40Gb/s U/S
N ʎs for 4 types of ONUs respectively operating at
different ʎs, 10Gbps per ʎ U/S.
TDMA in U/S for ONUs working at the same ʎ.
NRZ
Slide 6
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Candidate B: TWDM-PON
Pros
Smooth evolution from E-PON/10G-EPON, and co-existence with legacy PONs and OTDRs.
Dynamic bandwidth assignment.
Mature technology
Low cost
Cons
Wavelength management issues, wavelength drifting between different type of ONUs
Tunable laser and tunable filter are required.
Slide 7
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Candidate C: WDM PON
Two classes of WDM PONs are defined
ʎ-routed (WR)
Wavelength is determined by its
physical connectivity to the ODN;
This class of WDM PON supports
filtered ODN
ʎ-selected (WS)
The λ selector is built into the ONU;
This class of WDM PON supports
power Splitter based ODN
Slide 8
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Coexistence with legacy PON
Power splitter ODN: suitable for WS architecture
Filtered PON: supported by both WR and WS architectures
Pros
Low power budget requirement
Exclusive , Ultrahigh speed Access per ʎ per user
High security, no Rogue ONU issue
Low delay, low jitter
Cons
High cost
Wavelength drifting between different type of ONUs
Use AWG to replace power splitter
No statistical gain on the media resulting in better apparent performance.
Candidate C: WDM PON
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Candidate D: OFDM PON
40Gb/s or 100Gb/s D/S
Intensity Modulation-Direct Detection
(IM-DD)
DMLs/EMLs, PD/APD
OLT/ONU with SOA/EDFA
OFDM+high level modulation
ADC/DAC
10 Gb/s or 40Gb/s U/S
TDMA
OFDM+high level modulation
ADC/DAC
PD/TIA
OLT
PD/TIA
ONU
upstream
downstream
OM
OM
OLT MAC
DSP IFFT
DSP FFT
ONU MAC
DSP FFT
DSP IFFT
RFAnalog
Front-End
RFAnalog
Front-End
RFAnalog
Front-End
RFAnalog
Front-End
Splitter
Slide 10
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Candidate D: OFDM PON
Pros
By encoding vector signals in each subcarrier, bandwidth requirement is lessened
and dispersion tolerance is increased.
Mature optical components can be reused.
Co-existence with legacy ODNs with legacy splitting ratios.
Flexible dynamic bandwidth access to accommodate full services.
Software-defined modification.
Cons
High SNR requirement because of high level modulation and PAPR.
High speed ADC/DAC increases the cost.
More logic resource of DSP
High power consumption
Slide 11
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Summary
Candidates Pros Cons
TDM-PON Simple structure
Smooth migration from EPON /10G-EPON,
Coexistence with legacy EPON /10G-EPON.
No complication of wavelength configuration
At 40Gb/s, CD is a critical issue.
Low power budget
High peak data rate per ONU and low efficient date
40G and 25G optical components are not mature
TWDM-PON Mature technology
Smooth migration from EPON/10G-EPON,
Coexistence with legacy EPON/10G-EPON.
Wavelength management
Tunable laser and tunable filter
WDM-PON Low power budget
High security
Per user per ʎ
Low delay, low jitter
High cost
Wavelength drifting between different type of ONUs
AWG is required
No statistical gain on media
OFDM-PON High spectrum effectiveness and dispersion
tolerance
Low BW optical components
Flexible and soft-defined modification
High SNR requirement
High sample rate ADC/DAC
DSP
High power consumption
Slide 12
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