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Markus Roppelt, Klaus Grobe 07.02.2012 Overview on WDM-PON – the NG-PON Perspective

ADVA Accordance Joint WS2012 03

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Markus Roppelt, Klaus Grobe

07.02.2012

Overview on WDM-PON – theNG-PON Perspective

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Outline

• Requirements for NG-PON

• Short Presentation of different systems

• TDWM

• - -

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• WR-WDM-PON with tunable laser

• WS-WDM-PON with tunable filter

• Conclusion

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Requirements / Wish list

• High Client Count & Passive Reach

• Central-office consolidation

• Per-client capacity scaling for combined backhaul and access

• Up to (and beyond) 1 Gb/s for residential access• Higher for 3G, 4G backhaul and business access (GbE, 10GbE)

• ODN migration and co-existence

• Mi ration from currentl de lo ed X G-PON

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• Co-existence with deployed (X)G-PON

• CapEx / OpEx

• Cost-effective CapEx

• Power consumption and OLT form factor

• Technical complexity

• Direct detection vs. coherent heterodyne detection (UDWDM-PON)

• 10G high-power TRX vs. 1G medium-power TRX

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most discussed solutions in FSAN

• WDM-PON and hybrid TDM/WDM-PON (TWDM-PON)

• WDM-PON variants

• filtered (Wavelength-Routed) infrastructure• power-split infrastructure (Wavelength-Selected)

• WDM-PON technologies

 

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• (self-) seeded reflective devices (RSOA, REAM, IL-FP lasers)

• direct detection (DWDM-PON) or coherent heterodyne detection(UDWDM-PON)

• WDM-PON receivers can be based on per-wavelength, dedicated

access (WDMA) or shared access (primarily TDMA, also SCMA,CDMA, OFDMA) is possible

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TWDM-PON (Filter + Power-Splitter)

RN2

1:k

OLT

RN1

   F   i   l   t  e  rTX

TDMArray

RXTDMAArray

ONU

APD

   S  o   C

Tuning

   T   D   M   A ,   F   E   C

MZM

T-LD

Filter

 

© 2012 ADVA Optical Networking. All rights reserved.55

• m e per-c en capac y an ransparency

• Optimum for migration and co-existence

• Client Count: very high number per feeder fiber

• Passive Reach: Limited due to high-power-budget transceivers

• Backhaul: Not suitable due to bandwidth sharing

• OpEx: Higher density and lower power consumption in the OLT

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WR-WDM-PON with RSOAs (Filter)

OLT

RN

   A   W   GTX

Array

RXArray

ONU

RX

   S  o   C

3dB

RSOA

IRZ

RZ

DS

IRZ

US

RZ

0 0

0 01 1

1 1

• low com lexit ONUs low cost er Gb s

© 2012 ADVA Optical Networking. All rights reserved.66

 

• Issues with legacy ODN migration and co-existence

• reduced bit rates due to seeded RSOA concept (reflections)

• Client Count: high , Spectrum efficiency due to wavelength re-use

• Passive Reach: high, Reach Extender possible

• Backhaul: suitable

• OpEx: Relatively low power consumption, mean OLT density

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WR-WDM-PON with Tunable Lasers(Filter)

ONU

OLT

RN

   A   W   GTX

Array

RX

Array

L/C

Tunable LD

RX

Etalon,

Photo Diodes,ADC, FFT, DSP

C/LECC, DSP, DAC

Wavelength

Control Loop

ECC

   S  o   C

• low complexity ONUs, low cost per Gb/s

© 2012 ADVA Optical Networking. All rights reserved.77

• Issues with legacy ODN migration and co-existence

• Client Count: high

• Passive Reach: very high, Reach Extender possible

• Backhaul: very suitable, scaling to very high per-client andtotal capacity possible

• OpEx: Relatively low power consumption, mean OLT density

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WS-WDM-PON with Tunable Lasers andTunable Filters (Power Splitter)

ONU

OLT

TXArray

RX

Array

L/C

Etalon,Photo Diodes,

ADC, FFT, DSP

BN

1:N

TF

Wavelength

Control LoopTunable LD

RX

C/LECC, DSP, DAC    S

  o   C

• More complex and costly than WR variant due to tunable filter

© 2012 ADVA Optical Networking. All rights reserved.88

• Can support legacy ODN

• Client Count: high

• Passive Reach: high, Less passive reach than WR variant

• Backhaul: suitable, scaling to very high per-client and totalcapacity possible

• OpEx: Relatively low power consumption, mean OLT density

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Reach Overview

• Maximum NG-PON passive Reach (acc. to FSAN NG-PON2 Studyand OASE WP4) for a ODN with 64 users (without reachextender)

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OpEx comparision

• PON Per-Client Power Consumption and OLT Client Density

4

5

6

7

 

  n  p  e  r   C   l   i  e  n   t   [   W   ] ONU

OLT

6,000

8,000

10,000

    R  a  c   k   (   4   4   H   U   )

© 2012 ADVA Optical Networking. All rights reserved.1010

TWDM-PONWR-WDM-PONG-PON0

1

2

3

   P  o  w  e  r   C  o  n  s  u  m  p

   t   i  o 

0

2,000

4,000

   C   l   i  e  n   t  s  p  e  r   O

   L 

TWDM-PONWR-WDM-PONG-PON

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Overview table

TWDM WR-WDM-PON(seeded)

WR-WDM-PON(laser)

WS-WDM-PON(splitter)

High ClientCount ++ + + +/-

Passive Reach +/- + ++ +/-

© 2012 ADVA Optical Networking. All rights reserved.1111

Bac au ,business access

-- + ++ +

ODN migration ++ -- -- +

CapEx + + + +/-

OpEx + +/- +/- +/-

Technical

complexity

+ + + +/-

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Conclusion

• No system fits all needs

• Every System has advantages / disadvantages depending

on the focus

-

© 2012 ADVA Optical Networking. All rights reserved.1212

 

• TWDM-PON

• Focus on Mobile Backhaul

• WR-WDM-PON (laser or seeded)

• Focus on Passive Reach• WR-WDM-PON (laser)

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