0
IPC 2013, Bellevue WA (WG1.2)
Mark Filer and Sorin Tibuleac
ADVA Optical Networking / Atlanta, GA
mfiler@advaoptical.com
P...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
Introduction
• Increased c...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
• Broadcast-and-Select:
• ...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
to other
degrees
from othe...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
Isolation requirements?
• ...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
AOM
6x
4x
120G co-
herent ...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
AOM
6x
4x
120G co-
herent ...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
AOM
6x
4x
120G co-
herent ...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
CW DFB
sources
AOM
6x
4x
1...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
Cascaded passband evolutio...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
4 ROADMs8 ROADMs12 ROADMs1...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
Cascaded crosstalk evoluti...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
Results
• Expected worse p...
© 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2)
Conclusions
• Combined pen...
IPC 2013, Bellevue WA (WG1.2)
Thank you.
mfiler@advaoptical.com
contact details:
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Performance Tradeoffs of 120 Gb/s DP-QPSK in ROADM Systems

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Check out Mark Filer and Sorin Tibuleac's IEEE IPC 2013 slides on performance tradeoffs of 120 Gb/s DP-QPSK in ROADM systems employing broadcast-and-select versus route-and-select architectures

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Transcript of "Performance Tradeoffs of 120 Gb/s DP-QPSK in ROADM Systems"

  1. 1. IPC 2013, Bellevue WA (WG1.2) Mark Filer and Sorin Tibuleac ADVA Optical Networking / Atlanta, GA mfiler@advaoptical.com Performance Tradeoffs of 120 Gb/s DP- QPSK in ROADM Systems Employing Broadcast-and-Select Versus Route- and-Select Architectures
  2. 2. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) Introduction • Increased capacity demands require optical transmission through spectrally-dense ROADM-enabled networks • Increasingly challenging due to high bit-rate signals with bandwidths on the order of the channel spacing (e.g., 100G) • Passband and isolation characteristics of WSS become critical – must be accounted for properly in system architecture and design • ROADM architecture options: • Broadcast-and-Select (B&S) • Route-and-Select (R&S) • Passband narrowing and crosstalk accumulation effects have been treated separately in prior work • This study: performance of 120 Gb/s coherent DP-QPSK in a ROADM-enabled network considering both impairments simultaneously
  3. 3. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) • Broadcast-and-Select: • passive 1xN splitter followed by single Nx1 WSS • signals broadcast (“copied”) onto all splitter output ports • signals selectively passed or blocked at each Nx1 WSS input port • Route-and-Select: • 1xN followed by Nx1 WSSs • signals selectively routed or blocked to 1xN WSS output ports • signals selectively passed or blocked at each Nx1 WSS input port ROADM architectures to other degrees from other degrees broadcast select WSS drop add to other degrees from other degrees route WSS select WSS drop add
  4. 4. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) to other degrees from other degrees route WSS select WSS drop add • Broadcast-and-Select:  reduced optical/electronic complexity, cost, power consumption  lower passband narrowing  reduced isolation (higher crosstalk leakage)  high IL for large N • Route-and-Select:  increased optical/electronic complexity, cost, power consumption  increased passband narrowing  superior isolation (lower crosstalk leakage)  acceptable IL for large N ROADM architectures (2) to other degrees from other degrees broadcast select WSS drop add
  5. 5. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) Isolation requirements? • Total Crosstalk: isoWSS + 10∙log(N-1) + 10∙log(M), e.g., isoWSS=-27dB, N=9, M=10 Total Crosstalk = (-27dB) + (9dB) + (10dB) = -8dB • requirements on isolation profile of stopband? •  “weighted” crosstalk approach* Nx1 WSS modulated optical spectrum port isolation xM * Filer and Tibuleac, Optics Express, Vol. 20, pp.17620-17631 (2012)
  6. 6. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) AOM 6x 4x 120G co- herent Rx demux DSP 60-80km NZ-DSF 120G DP- QPSK Tx 120G DP- QPSK xtalk mux route WSS select WSS block fcn 2x2 AOM Experiment Recirculating loop emulating system with 24 cascaded ROADM nodes • 120 Gb/s DP-QPSK coherent XPDR • 4x ROADM nodes with EDFA, VOA, and 1 or 2 N-degree WSSs (configurable to R&S or B&S architecture) • 60-80km NZ-DSF*, -6dBm/ch into fiber
  7. 7. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) AOM 6x 4x 120G co- herent Rx demux DSP 60-80km NZ-DSF 120G DP- QPSK Tx 120G DP- QPSK xtalk mux route WSS select WSS block fcn 2x2 AOM Experiment Recirculating loop emulating system with 24 cascaded ROADM nodes • 120 Gb/s DP-QPSK coherent XPDR • 4x ROADM nodes with EDFA, VOA, and 1 or 2 N-degree WSSs (configurable to R&S or B&S architecture) • 60-80km NZ-DSF*, -6dBm/ch into fiber • uncorrelated 120 Gb/s DP-QPSK XPDR as crosstalk source 120G DP- QPSK Tx Fast Polar. Scrambler mux 120G DP-QPSK xtalk
  8. 8. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) AOM 6x 4x 120G co- herent Rx demux DSP 60-80km NZ-DSF 120G DP- QPSK Tx 120G DP- QPSK xtalk mux route WSS select WSS block fcn 2x2 AOM Experiment Recirculating loop emulating system with 24 cascaded ROADM nodes • 120 Gb/s DP-QPSK coherent XPDR • 4x ROADM nodes with EDFA, VOA, and 1 or 2 N-degree WSSs (configurable to R&S or B&S architecture) • 60-80km NZ-DSF*, -6dBm/ch into fiber • uncorrelated 120 Gb/s DP-QPSK XPDR as crosstalk source • optional block fcn WSS to emulate blocking function of another degree’s ‘route’ WSS for R&S case
  9. 9. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) CW DFB sources AOM 6x 4x 120G co- herent Rx demux DSP 60-80km NZ-DSF 120G DP- QPSK Tx 120G DP- QPSK xtalk mux route WSS select WSS block fcn 2x2 AOM Experiment Recirculating loop emulating system with 24 cascaded ROADM nodes • 120 Gb/s DP-QPSK coherent XPDR • 4x ROADM nodes with EDFA, VOA, and 1 or 2 N-degree WSSs (configurable to R&S or B&S architecture) • 60-80km NZ-DSF*, -6dBm/ch into fiber • uncorrelated 120 Gb/s DP-QPSK XPDR as crosstalk source • optional block fcn WSS to emulate blocking function of another degree’s ‘route’ WSS for R&S case • additional unmodulated CW sources coupled in to maintain constant amplifier gain during loop transitions
  10. 10. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) Cascaded passband evolution • R&S – experiences twice the number of passbands as B&S • Reflected in 3dB-BW evolution vs # ROADMs • BW vs # ROADMs curve shifted by factor 2x for R&S compared to B&S Broadcast-and-Select Route-and-Select
  11. 11. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) 4 ROADMs8 ROADMs12 ROADMs16 ROADMs20 ROADMs24 ROADMs • Plot of crosstalk vs # ROADMs shows great crosstalk advantage of R&S architecture • OSNR penalties may be computed by knowing crosstalk tolerance of modulation format Cascaded crosstalk evolution Broadcast-and-Select Route-and-Select
  12. 12. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) Cascaded crosstalk evolution
  13. 13. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) Results • Expected worse performance for R&S vs B&S due to additional passband narrowing • Additional degradations due to crosstalk accumulation as predicted by weighted crosstalk analysis: • 0.05 to 0.2 dB for B&S • 0 dB for R&S • Overall performance better for B&S than R&S
  14. 14. © 2013 ADVA Optical Networking. All rights reserved. Confidential.IPC 2013, Bellevue WA (WG1.2) Conclusions • Combined penalties due to passband and isolation characteristics of 9x1 WSSs were studied for 120 Gb/s DP-QPSK transmission • Broadcast-and-Select and Route-and-Select ROADM architectures considered • Overall system penalties are lower for B&S than for R&S configurations by up to 0.5dB • B&S may be preferred architecture for ROADM nodes of N ≤ 9 • For N > 9, R&S architecture is desirable due to the higher insertion loss inherent to B&S
  15. 15. IPC 2013, Bellevue WA (WG1.2) Thank you. mfiler@advaoptical.com contact details:
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