1. Protection notice / Copyright notice Bidirectional EDFA for future XL-PONs M. Rasztovits-Wiech / Siemens, 25. September 2006 Copyright © Siemens AG 2006. All rights reserved.

2. Page 2 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Content 1.Objectives of XL-PON 2.System overview 3.Optical amplifier, requirements and design 4.Experiments 5.Summary

3. Page 3 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

4. Page 4 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI XL-PON system overview < 70 km < 30 km OLT 10Gbps / 2.5Gbps One fiber for access to all MAPs 1:512 EDFA, OADM Transponder MAP ONT OLT  all downstream and ONT upstream in C-band  colorless ONT  Low power consumption in amplification nodes

5. Page 5 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI MAP – Metro Access Point Approach:  downstream saturates bidirectional EDFA Challenge:  Reflections  Gain of BEDFA <=20dB  splitter included

6. Page 6 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Characteristics of the EDFAs PEDFA (downstream preamplifier, unidirectional)  Low cost commercial type with uncooled pump @ 980nm  Output power controlled BEDFA (bidirectional)  18dBm output power, NF <7dB  13m EDF, 200mW pump power @ 980nm  Output power controlled

7. Page 7 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Prototype BEDFA and other optics PEDFA 1:8 splitter BEDFA pump

8. Page 8 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI BEDFA - Optical Spectrum DownstreamUpstream 3nm

9. Page 9 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Experiment 1 - interaction between US and DS Without USWith US

10. Page 10 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Experiment 2 – Upstream channel Features of transponder:  2.5Gbit/s APD RX  Autonomous burst detection  17dB dynamics OSNR = 13.5dB@0.1nm Result:

11. Page 11 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Experiment 3 - Setup Aim: Evaluate sensitivity against ODN structure at 10Gbit/s All but one open (APC) mixed connection "best case"

12. Page 12 September 2006 Copyright @ Siemens AG 2006. All rights reserved Siemens / Austria / PSE SMC CI Experiment 3 - Result ~ 1dB

13. Page 13 September 2006 Copyright @ Siemens AG 2006. All rights reserved 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

14. Page 14 September 2006 Copyright @ Siemens AG 2006. All rights reserved 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