Modified Constant Modulus Algorithm With Polarization Demultiplexing in Stokes Space in Optical Coherent Receiver

We propose a modified method of constant modulus algorithm (CMA) based on polarization demultiplexing in Stokes space for polarization demultiplexing (SS-PDM) in optical coherent receivers. SS-PDM can tolerate chromatic dispersion (CD) and polarization-dependent loss (PDL), but is sensitive to PMD....

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Veröffentlicht in:Journal of lightwave technology Jg. 31; H. 19; S. 3203 - 3209
Hauptverfasser: Yu, Zhenming, Yi, Xingwen, Zhang, Jing, Deng, Mingliang, Zhang, Hongbo, Qiu, Kun
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York, NY IEEE 01.10.2013
Institute of Electrical and Electronics Engineers
Schlagworte:
Applied sciences
Circuit properties
Coherent detection
constant modulus algorithm
Convergence
Demultiplexing
Detection, estimation, filtering, equalization, prediction
Electric, optical and optoelectronic circuits
Electronics
Exact sciences and technology
Finite impulse response filters
Information, signal and communications theory
Integrated optics. Optical fibers and wave guides
Optical and optoelectronic circuits
Optical fiber communications
Optical fibers
Optical polarization
Optical telecommunications
polarization demultiplexing
polarization-dependent loss
polarization-mode-dispersion
Receivers
Signal and communications theory
Signal, noise
Stokes space
Systems, networks and services of telecommunications
Telecommunications
Telecommunications and information theory
Transmission and modulation (techniques and equipments)
Vectors
Singularity
Chromatic dispersion
Non linear filter
Data transmission
Polarization mode dispersion
Coherent detection
Convergence speed
Digital filter
Optical polarization
Optical transmission
polarization-dependent loss
CMA
Optical receiver
Convergence rate
Optical fiber communication
High rate transmission
Stokes space
Quadrature phase shift keying
Constant modulus algorithm
Demultiplexing
Simulation
polarization demultiplexing
Polarization division multiplexing
polarization-mode-dispersion
Finite impulse response filter
Transmission loss
Group delay
ISSN:0733-8724, 1558-2213
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Beschreibung
Zusammenfassung:We propose a modified method of constant modulus algorithm (CMA) based on polarization demultiplexing in Stokes space for polarization demultiplexing (SS-PDM) in optical coherent receivers. SS-PDM can tolerate chromatic dispersion (CD) and polarization-dependent loss (PDL), but is sensitive to PMD. On the other hand, the CMA with high-order FIR filters could compensate for polarization-mode-dispersion (PMD) effectively, but suffers from the singularity problem which results from PDL. Therefore, we use the polarization rotation matrix estimated by SS-PDM to set the initial center taps of the CMA. The singularity problem of the CMA is avoided effectively in a much wider range of PDL and its convergence speed is also improved. We demonstrate this modified CMA in a simulation of 100-Gbit/s PDM-QPSK with PDL of 1, 3, and 5 dB, respectively. PDL is emulated by attenuating one polarization tributary before polarization multiplexing and the interaction between PDL and PMD is ignored. The singularity problem disappears as expected. Because the tolerance of PDL is affected by DGD, we further investigate the PDL tolerance under different DGD. Finally, we conduct the simulation of 100-Gbit/s PDM-QPSK with PDL of 3 dB over 3000 km SSMF and 4000 km SSMF separately. The convergence speed accelerates indeed compared with that of the conventional CMA.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2013.2281100