Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus...

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Impairments in Polarization- Multiplexed DWDM Channels due to Cross-Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik TECHNISCHE UNIVERSITÄT BERLIN Dario Setti http://www.marcuswinter.de/publications/ leos2008

Transcript of Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus...

Page 1: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

Impairments in Polarization-Multiplexed DWDM Channels due to Cross-

Polarization Modulation

Marcus WinterChristian-Alexander Bunge

Klaus Petermann

Hochfrequenztechnik-Photonik

TECHNISCHEUNIVERSITÄTBERLIN

Dario Setti

http://www.marcuswinter.de/publications/leos2008

Page 2: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

cross-polarization modulation(XPolM)

Page 3: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

XPolM is a nonlinear interchannel effect whichrandomly rotates the polarization states in time

similar to how XPM affects the phase

Page 4: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

nonlinear polarization effects

Page 5: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

distribution of SOPs of a CW probe channelpropagation of 10 spans with 10 × 10 Gbps NRZ interfering channels

Page 6: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

distribution of SOPs of a CW probe channelpropagation of 10 spans with 10 × 10 Gbps NRZ interfering channels

DOP = 0.894

Page 7: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

θ is the „deflection“ from the mean directionφ is the azimuth

average SOP

Page 8: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

impairments in PolDM systems

Page 9: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

PolDM subchannel is originally (on average)x-polarized

symbol SOP is rotated through XPolM by an angle θ (in Stokes space) from the mean

fading

crosstalk

Jones spacevisualization

Page 10: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

crosstalk

fading

Page 11: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

crosstalk from a single CW channel into orthogonal (y-)polarization

DOP = 0.894

crosstalk phase depends on azimuth φ in Stokes space

Page 12: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

fading within a single CW channel(x-polarization)

DOP = 0.894

fading

Page 13: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

crosstalk variance vs. CW DOP reduction

valid only for the polarization / PMD ensemble

only the ensemble statistics of the SOPs are known

Page 14: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

system simulations

Page 15: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

PolDM’ed (low-power) CW probe and QPSK signal +10 × 10 Gbps NRZ interferers

PolDM DEMUX is aligned to mean CW probe SOP

determination of I and Q ROSNR as if it werean (all-zero) 10 Gbaud DQPSK signal

Page 16: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

CW subchannel only

– variations are caused by XPM no dependence on DOP

500 iterations with random polarization parameters / NRZ bit patterns

Page 17: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

large ROSNR variation due to non-Gaussian crosstalk within individual members of the ensemble

significant dependence on DOP

CW probe w/ QPSK PolDM neighbor

500 iterations with random polarization parameters / NRZ bit patterns

analytical estimate using Gaussian crosstalk distribution

and variance

Page 18: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

summary and conclusions

Page 19: Impairments in Polarization-Multiplexed DWDM Channels due to Cross- Polarization Modulation Marcus Winter Christian-Alexander Bunge Klaus Petermann Hochfrequenztechnik-Photonik.

TECHNISCHEUNIVERSITÄTBERLIN

Fachgebiet Hochfrequenztechnik

XPolM-induced depolarization leads to crosstalk between and fading within PolDM subchannels

crosstalk added at the PolDM demultiplexer is Gaussian distributed and predictable (in the statistical average)

individual realizations within the statisticalensemble can be significantly non-Gaussian

large variation of observed system penalties

outage statistics required for a more accurate description