Broadband Access Solutions on a Common CWDM Platform

K. Habel, K.-D. Langer (HHI)G.-J. Rijckenberg, A. Ng’oma, T. Koonen, (TU/e)J. Lepley, S. Walker (UoE)

NOC 2006 11.-13.07.2006 — 2

Outline

> Introduction/ Motivation

> Description of developed solutions• CWDM Rings• VDSLoO• FWA

> Experimental results

> Conclusion

NOC 2006 11.-13.07.2006 — 3

Introduction/Motivation

> Demand for high-speed access solutions is rising

> Triggered by “new” services like VoIP, IPTV, VoD, …

> IST project MUSE aims for cost-efficient solutions for a multi-provider multi-service access network

> MUSE results with respect to optical access presented

> Three particular optical access solutions have been developed: • A CWDM Ring architecture: provides protected FttX connectivity and

feeder network for other First Mile• Analogue VDSL over optics architecture: transmits VDSL signals

over an optical carrier by means of SCM• Fixed Wireless Access (FWA): based on a Radio over Fibre (RoF)

using Optical Frequency Multiplication (OFM)

> Solutions developed independently, but have been integrated for testing on common CWDM Ring platform for joint experiment

NOC 2006 11.-13.07.2006 — 4

Setup Overview

> Optical feeder carrying three technologies

> Demonstration of interoperability on physical layer

> Combination of analogue and digital signals distortions?

OLTOLT CWDM FAR

VDSLoO

VDSL

RAPRAP

e.g. WiMAX

DAR (GbE) with protection

ONUONU

ONUONU

FWA

shared GbEONUONU

metro homedistributionfeederCO

NOC 2006 11.-13.07.2006 — 5

CWDM, what was it again?

> ITU-T G.694.2: 18 -channels with 20 nm spacing

> Large channel spacing allows:• un-cooled lasers (temperature dependence) • relaxed manufacturing tolerances • Easier filter design (compared to DWDM)

low-cost

> Better usage of fibre bandwidth compared to established access systems (1310/1490/1550nm)

> More expensive than single channel solutions

> Less expensive than DWDM systems

nm1300 1400 1500 1600

NOC 2006 11.-13.07.2006 — 6

Outline

> Introduction

> Description of developed solutions• CWDM Rings• VDSLoO• FWA

> Experimental results

> Conclusion

NOC 2006 11.-13.07.2006 — 7

CWDM Rings system: lab setup (HHI)

• CWDM feeder ring with: up to 20km length, up to 9 remote nodes and 18 -channels

• single wavelength distribution ring (can be grey by using a media converter)

• System provides protected path to ONUs

EthernetSwitch

PC Linux

ONU #1

Protection path

Normal path

ONU #2

Customer(s)

Customer(s)

Feeder area ring Distribution area ring

Hub (CO)

toMetro

domain

SFP-TRx

SFP-TRx

SFP-TRx

SFP-TRx SFP-TRx

SFP-TRx

PC Linux

MUX DMUX

MUXDMUX

OADM

OADM

NOC 2006 11.-13.07.2006 — 8

VDSL over optics (OLT)

HPF

DFB-LaserLO

Photodiode

OLT

Upstream

Downstream

CO DSLAM

Optical Interface

COmodem

COmodem

COmodem

COmodem

4100base-T

DC

Circ.

4x

-100

-90

-80

-70

-60

-50

-40

-30

-20

200 250 300 350 400

Frequency (MHz)

Re

lativ

e P

SD

(d

B)

200 300 400Frequency (MHz)

-20

-60

-100re

l- P

SD

(d

Bm

)

60 MHz channel separation

4 channels using 998-138-1200 VDSL band plan

NOC 2006 11.-13.07.2006 — 9

VDSL over optics (ONU)

100BASE-THPFDFB-LD

LO

Photodiode

DC

CPE modem

ONU

Downstream

Upstream

Optical Interface

-100

-90

-80

-70

-60

-50

-40

-30

-20

200 250 300 350 400

Frequency (MHz)

Re

lativ

e P

SD

(d

B)

200 300 400Frequency (MHz)

-20

-60

-100

rel.

PS

D

(dB

m)

> Simple ONU design

> Low power consumption (ideal for remote cabinets)

> Low foot-print

NOC 2006 11.-13.07.2006 — 10

FWA system: Bi-directional OFM system with remote LO (TU/e)

Fiberlink

fsw

tun.LD

MZIMod.

0

Headend station

PDdata up

1

0

1

WDM

periodic BPF

fshift

data down

BPF2

fmm – fshift fmm + fshift

BPF1

fmm

DSPAGC

DAC

ADC

PD

Radio Access Point

BPF1

fmm

x

BPF1LD

antenna

circulator

1

0

mixer

WDM

fIF

BPF2

LNAMPA

•(De)modulation

•Filtering

•Synchronisation

BPF

NOC 2006 11.-13.07.2006 — 11

Outline

> Introduction

> Description of developed solutions• CWDM Rings• VDSLoO• FWA

> Experimental results

> Conclusion

NOC 2006 11.-13.07.2006 — 12

Trial setup overview

Two counter-propagatingfibre rings (10km)

OLTOLT CWDM FAR

VDSLoO

VDSL

ONUONU

RAPRAP

e.g. WiMAX

FWA

DAR (GbE) with protection

ONUONUshared GbEONUONU

metro homedistributionfeederCO

NOC 2006 11.-13.07.2006 — 13

1300 1350 1400 1450 1500 1550 1600-70

-60

-50

-40

-30

-20

-10

0

Pow

er [dBm

] / 0.

2 nm

wavelength [nm]

RBW: 0.2nmfeeder ring (outer)after RN2

CWDM channel comb

1300 1350 1400 1450 1500 1550 1600-70

-60

-50

-40

-30

-20

-10

0

VDSLoOCWDMRings

Pow

er [dBm

] / 0.

2 nm

wavelength [nm]

RBW: 0.2nm

feeder ring (outer)after MUX @ CO

FWA

CWDM signal after MUX @ CO CWDM signal after remote node 2

16 channels (20nm spacing)

CWDM protection

NOC 2006 11.-13.07.2006 — 14

CWDM Rings: Comparison of Receiver Sensitivity

protection path (downlink)

Sensitivity: ~-27 dBm

Penalty: ~0.1 dB

normal path (uplink)

Sensitivity: ~-27 dBm

Penalty: ~0.3 dB

-29,5 -29,0 -28,5 -28,0 -27,5 -27,0 -26,5 -26,01E-10

1E-9

1E-8

1E-7

1E-6

1E-5

1E-4

1E-3 back-to-back stand alone trial integrated

BE

R

PRx [dBm]

protection pathdownstreamR = 1.25 Gb/s

-29,5 -29,0 -28,5 -28,0 -27,5 -27,0 -26,5 -26,01E-10

1E-9

1E-8

1E-7

1E-6

1E-5

1E-4

1E-3

back-to-back stand alone trial integrated

BE

RPRx [dBm]

normal pathupstreamR = 1.25 Gb/s

NOC 2006 11.-13.07.2006 — 15

FWA: Measured spectra for up- and downstream

Downstream @ Antenna station:

> very pure carriers with a few Hz linewith

Upstream (received):

• Bidirectional system shown

~17.2 GHz ~1.1 GHz

NOC 2006 11.-13.07.2006 — 16

FWA: Measured EVM and SNR parameters of the recovered upstream data

VSA (vector signal analyser)measurements:

> 16 QAM constellation diagram

> 100 Mbps bitrate

> Transmission over the CWDM Ring with other systems also active –IF at 1.1 GHz

> EVM of <6% for all cases, compliant with WiMax standard

NOC 2006 11.-13.07.2006 — 17

VDSLoO: Bit Loading characteristic

0

1

2

3

4

5

6

0 1 2 3 4 5 6 7 8 9 10 11 12

Frequency (MHz)

Bit

Load

ing

(2^x

)

Downstream

Upstream

> aggregate downstream (blue) rate = 19 Mbps

> upstream (red) rate = 10.6 Mbps

> data transmission efficiency 25 … 30%, caused by EMI

> 70% efficiency has been shown in stand-alone setup

> Interchannel crosstalk measured at <23 dB for 30 MHz channel spacing

NOC 2006 11.-13.07.2006 — 18

Conclusions

> Feasibility of an integrated passive CWDM feeder ring with protection shown (up to 20 km possible)

> Three different prototypes: FWA, VDSLoO, and CWDM Rings integrated into one optical access system

> Systems did not interfere with each other and have same characteristics compared to stand-alone setups

> CWDM technology allows for various feeder architectures (ring, star, …) and can carry different types of distribution technologies

NOC 2006 11.-13.07.2006 — 19

End

Thank you for your attention,

By the way parts of this setup arer shown at the foyer