deployment analysis of tdm/wdm single fiber pon with colourless onu operating at 2.5 gbps...
DESCRIPTION
A single-fiber full-duplex hybrid TDM/WDM-PON is demonstrated to operate at 2.5/1.25 Gbps rates, with RSOA ONU. It achieves high power budget (GPON compliant) at a distances higher than 20km, and serves up to 1280 users.TRANSCRIPT
Deployment Analysis of TDM/WDM Single Deployment Analysis of TDM/WDM Single Fiber PON with Colourless ONU operating Fiber PON with Colourless ONU operating
at 2.5 Gbps Sub-Carrier Multiplexed at 2.5 Gbps Sub-Carrier Multiplexed Downstream and 1.25 Gbps UpstreamDownstream and 1.25 Gbps Upstream
J. M. Fàbrega, V. Polo, J. A. Lázaro, E.T. López, and J. PratUniversitat Politècnica de Catalunya (UPC)Jordi Girona D5; 08034 Barcelona, Spain
A. El Mardini, and R. SoilaTellabs Inc.
18581, North Dallas Parkway, Dallas, TX 75287 USA
Outline
Introduction SCM-DPSK modulation Scenarios description
Large coverage with low number of users
Medium coverage Large density of users
Experiments Conclusions
Introduction
Next generation FTTH: Migration from TDM-PON to hybrid WDM/TDM-PON Key features for cost-effective implementation:
∙ Single fiber, bidirectional transmission External Fibre-Plant reduced Connection management of the outside plant simplified
∙ Colourless Reflective ONU No laser source at ONU No stabilization neither inventory problems
Introduction
∙ IM-IM systems High interference between upstream and downstream Extinction Ratio management
∙ SCM(DPSK)-IM Upstream and downstream signal use different electrical
spectra channels Electrical orthogonality between upstream and
downstream Reduced interference between upstream and
downstream Simple compatibility with GPON electronics.
SCM/DPSK – IM modulation
MUX
OLTONU
TX SCMPSK
RX IM
RX DPSK
rTX
1.25 GHz
1.25Gb
UP
2.5 GHz
2.5Gb
1.25 GHz
1.25Gb
UP
5 GHz
2.5Gb
DOWN
fe
t
t
1.25 GHz 5 GHz
1.25Gb 2.5GbUP
fe
Down: SCM-DPSK
Up: IM
2.5 GHz
2.5Gb
Experimental setup
2.5 Gbps SCM-DPSK downstream 1.25 Gbps IM upstream OLT optically preamplified 3 scenarios
∙ Low density of users
∙ Medium density of users
∙ Large density of users
El. Osc.
MZM
TxLASER
DATADown
APD
DATAUp
LPF
APD
6 dB splitter
DATADown
RSOA
DATAUp
BER1
PPG1
PPG2
LPF
BER2
OLT
ONU
BPF
PONPON
70:30Coupler
-60
-55
-50
-45
-40
-35
-30
0 1000 2000 3000 4000 5000 6000 7000
Frequency (MHz)
Po
wer
(d
Bm
)
(a)
-65
-60
-55
-50
-45
-40
-35
0 1000 2000 3000 4000 5000 6000 7000
Frequency (MHz)
Po
wer
(d
Bm
)
(b)
-80
-70
-60
-50
-40
-30
-20
-10
0 1000 2000 3000 4000 5000 6000 7000
Power (dBm)
Fre
qu
ency
(M
Hz)
(d)
-80
-70
-60
-50
-40
-30
-20
-10
0 1000 2000 3000 4000 5000 6000 7000
Frequency (MHz)
Po
wer
(d
Bm
)
(c)
SCM-DPSK modulation
Mx: Double balanced mixer LO: VCO@ 5 GHz BPF: bandpass filter,
∙ centered at 5 GHz ∙ about 4-5 GHz BW. ∙ Important: > 20 dB att @ 1.25 GHz
LPF: Lowpass filter,∙ For “matched” filtering (~2GHz
BW)
Tb: Delay of 1 bit
Data
TX
LO
Mx
Tb
Mx
to MZM
Data
RXBPF
LPF
all electrical components commercially available
-100
-90
-80
-70
-60
-50
-40
-30
0 2 4 6 8 10
Frequency (MHz)
Mag
nit
ud
e (d
B(a
.u.)
)
2.9 GHz
-20 dB
1.9 GHz
-3dB
Scenario 1: Low density of users
27.2 km coverage, giving service to 8 users 25 km feeder 1:8 splitter 2.2 km drop
Total network losses measured to be 16 dB ONU input power of -16 dBm ONU output power of +1 dBm 0 dBm injected from the OLT Measured Rayleigh Backscattering (RB) of -33.5 dBm (17.5 dB
OSRR).
25 km2.2 km
ONUOLT
1:8Powersplitter
Scenario 2: Medium density of users
20.6 km coverage, giving service to 160 users 16 km feeder spool 1:40 AWG demultiplexer 2.4 km distribution spool 1:4 power splitter 2.2 km drop spool
Total network losses measured to be 16.4 dB. ONU: input power of -16.4 dBm, output power of +0.8 dBm 0 dBm injected from the OLT to the feeder fiber Generated RB of -33.5 dBm (17.5 dB of upstream oSRR)
16 km
OLT
1:4Powersplitter
1x40AWG
2.4 km
ONU
2.2 km
Scenario 3: Large density of users 20.2 km coverage, giving service to 1280 users
Double fiber feeder is proposed against Rayleigh Backscattering 2 x 16 km feeder spools 1x40 AWG demultiplexer 2.4 km distribution spool 1:32 power splitter 2.2 km drop spool
Total network losses measured to be 26.6 dB ONU: input power of -16.6 dBm, output power of +0.8 dBm OLT output power of +10 dBm.
16 km
16 km
2.4 km
2.2 km
1x40AWG
1:32Powersplitter
ONU
MZM
PPG1
OLT
TxLASER
To photodetection
Experimental results
-12
-10
-8
-6
-4
-35 -30 -25 -20 -15
Input Power at ONU (dBm)
log(
BE
R)
Scenario 1
Scenario 2
Scenario 3
-12
-10
-8
-6
-4
-35 -30 -25 -20 -15
Input Power at OLT (dBm)
log(
BE
R)
Scenario 3Scenario 2
Scenario 1
Downstream sensitivityUpstream sensitivity
Downstream sensitivity
Upstream sensitivity
Downstream power budget
Upstream power budget
Downstream system margin
Upstream system margin
Scenario 1 -20.1 dBm -18.4 dBm 20.1 dB 19.4 dB 4.1 dB 3.4 dB
Scenario 2 -20.6 dBm -19 dBm 20.6 dB 19.8 dB 4.2 dB 3.4 dB
Scenario 3 -19.6 dBm -28.8 dBm 29.6 dB 29.6 dB 4 dB 4 dB
Conclusions
Demonstration of the bi-directional transmission of 2.5 Gbps/1.25 Gbps in a WDM-PON Downstream signal DPSK coded, operating at 5 GHz
subcarrier
Three deployment scenarios analyzed: 1. Large coverage are and low density of users2. Area with medium density of users3. Improved access network: large density of users
Scenarios 1, 2 show a network power budget of 20 dB Limited by Rayleigh Backscattering Covering up to 160 users
Scenario 3 exhibits a power budget of 29 dB Rayleigh Backscattering negligible Covering up to 1280 users
All cases with power margin > 3 dB
Thanks!!Thanks!!Josep M. Fàbrega
RSOA
Uncooled TO-CAN package Characteristics:
Bandwidth 1 GHz ER > 6 dB Small signal gain: ~18 dB Noise figure 8.5 dB
Bias Current (mA) 60 70 80
Gain (dB) @ 1530nm 16.7 18.4 19.6
Gain (dB) @ 1545nm 17.6 18.7 19.6
Gain (dB) @ 1560nm 14.9 15.8 16.7