Transcript Corporate Design PowerPoint Templates Com

Bidirectional EDFA
for future XL-PONs
M. Rasztovits-Wiech / Siemens, 25. September 2006
Copyright © Siemens
Protection
AG 2006.
noticeAll
/ Copyright
rights reserved.
notice
Content
1. Objectives of XL-PON
2. System overview
3. Optical amplifier, requirements and design
4. Experiments
5. Summary
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September 2006
Copyright @ Siemens AG 2006. All rights reserved
Siemens / Austria / PSE SMC CI
Objectives of XL-PON
 512 users (ONTs)
 Total reach up to 100km
 10Gbit/s downstream
 2.5Gbit/s upstream
 WDM in the feeder/metro Network
 ~65dB loss  40dB amplification required
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Copyright @ Siemens AG 2006. All rights reserved
Siemens / Austria / PSE SMC CI
XL-PON system overview
< 30 km
MAP
EDFA, OADM
Transponder
ONT
OLT
OLT
10Gbps / 2.5Gbps
EDFA, OADM
Transponder
ONT
1:512
MAP
One fiber for access
to all MAPs
 all downstream and ONT upstream in C-band
 colorless ONT
 Low power consumption in amplification nodes
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Siemens / Austria / PSE SMC CI
MAP – Metro Access Point
duplexer
PEDFA
ODN
OADM
BEDFA
1:8
metro
network
transponder
Approach:
Challenge:
 downstream saturates
bidirectional EDFA
 Reflections
 Gain of BEDFA <=20dB
 splitter included
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Siemens / Austria / PSE SMC CI
Characteristics of the EDFAs
BEDFA (bidirectional)
 18dBm output power, NF <7dB
 13m EDF, 200mW pump power @ 980nm
 Output power controlled
PEDFA (downstream preamplifier, unidirectional)
 Low cost commercial type with uncooled pump @ 980nm
 Output power controlled
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Prototype
duplexer
PEDFA
ODN
OADM
BEDFA
1:8
metro
network
BEDFA
and
other
optics
transponder
PEDFA
1:8
splitter
BEDFA
pump
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Siemens / Austria / PSE SMC CI
BEDFA - Optical Spectrum
Downstream
Upstream
3nm
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Siemens / Austria / PSE SMC CI
Experiment 1 - interaction between US and DS
Without US
With US
laser
controller
duplexer
25km
SMF
TX
2.5Gbit/s
Att
Mod
TX 10Gbit/s
Pump
laser
5dB
+
Er
BEDFA
duplexer
RX
10Gbit/s
RX 2.5Gbit/s
o/e
Scope
1kHz
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Siemens / Austria / PSE SMC CI
Experiment 2 – Upstream channel
duplexer
PEDFA
ODN
OADM
BEDFA
1:8
Burst
TX
metro
network
transponder
BER
Result:
OSNR =
[email protected]
1,0E-03
1,0E-04
Features of transponder:
BER
 2.5Gbit/s APD RX
 Autonomous burst detection
 17dB dynamics
Upstream BER before FEC
1,0E-05
1,0E-06
1,0E-07
1,0E-08
1,0E-09
1,0E-10
1,0E-11
-22,0
-21,5
-21,0
-20,5
-20,0
-19,5
-19,0
-18,5
transponder input power
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Experiment 3 - Setup
Aim: Evaluate sensitivity against ODN structure at 10Gbit/s
All but one open (APC)
"best case"
mixed connection
RX
RX
BER
1
:
8
1
:
8
25 km
TX
BEDFA
25 km
25 km
BER
1:8
50 km
1:16
TX
BEDFA
50 km
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Experiment 3 - Result
BER at 10Gbit/s
1,0E-02
1,0E-04
BER
1,0E-06
1,0E-08
Back-to-back
1,0E-10
~ 1dB
All open
1,0E-12
Typical connection
1,0E-14
-23
-22
-21
-20
-19
-18
-17
Input Power [dBm]
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Siemens / Austria / PSE SMC CI
Summary and Conclusion
 A bidirectional amplification scheme for future XL-PONs was evaluated
 10Gbit/s downstream channel without distortion
 No penalty due to upstream channel
 2.5Gbit/s upstream channel without distortion
 Upstream BER within expectation
 Sufficient after FEC
 Reflections can be kept under control
 Low penalty in realistic network
 Power consumption < 4 W
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Siemens / Austria / PSE SMC CI
Thank you for your attention!
This work is funded by the EC
 Integrated Project MUSE
www.ist-muse.org
Multi Service Access Everywhere
Page 14
September 2006
Copyright @ Siemens AG 2006. All rights reserved
Siemens / Austria / PSE SMC CI