Reduction of MIMO-FIR taps via SOP-estimation in stokes space for 100 Gbps short reach applications

Ng, Wei-Choon; Nguyen, An; Park, C. S.; Rusch, Leslie A.

doi:10.1109/ecoc.2014.6963901

Cited by 4 publications

(2 citation statements)

References 6 publications

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“…In this paper, as in Fig. 2 , we have implemented an extended Kalman fiter (EKF) based pre-rotation (PR) algorithm to estimate the state of polarization (SOP) for 2 × 2 MIMO processing per dual-carrier signal with greater accuracy and energy efficiency 63 . This facilitates reduced number of MIMO cross taps and avoids timing recovery failure due to differential group delay (DGD) at certain SOPs.…”

Section: Methodsmentioning

confidence: 99%

Advanced and flexible multi-carrier receiver architecture for high-count multi-core fiber based space division multiplexed applications

Asif

2016

Sci Rep

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Space division multiplexing (SDM), incorporating multi-core fibers (MCFs), has been demonstrated for effectively maximizing the data capacity in an impending capacity crunch. To achieve high spectral-density through multi-carrier encoding while simultaneously maintaining transmission reach, benefits from inter-core crosstalk (XT) and non-linear compensation must be utilized. In this report, we propose a proof-of-concept unified receiver architecture that jointly compensates optical Kerr effects, intra- and inter-core XT in MCFs. The architecture is analysed in multi-channel 512 Gbit/s dual-carrier DP-16QAM system over 800 km 19-core MCF to validate the digital compensation of inter-core XT. Through this architecture: (a) we efficiently compensates the inter-core XT improving Q-factor by 4.82 dB and (b) achieve a momentous gain in transmission reach, increasing the maximum achievable distance from 480 km to 1208 km, via analytical analysis. Simulation results confirm that inter-core XT distortions are more relentless for cores fabricated around the central axis of cladding. Predominantly, XT induced Q-penalty can be suppressed to be less than 1 dB up-to −11.56 dB of inter-core XT over 800 km MCF, offering flexibility to fabricate dense core structures with same cladding diameter. Moreover, this report outlines the relationship between core pitch and forward-error correction (FEC).

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Section: Methodsmentioning

confidence: 99%

Advanced and flexible multi-carrier receiver architecture for high-count multi-core fiber based space division multiplexed applications

Asif

2016

Sci Rep

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“…at will be converted to higher ASIC clock and faster signal processing and therefore faster convergence and more tracking of change in SOP transients. Clock speed that is driving the adaptive lter and other functionalities in the ASIC is an important factor that determines the amount of SOP tracking, as well as in [47], if bu ering of incoming data is used and then SOP rotation feed-forward correction is performed, then the SNR penalty can be reduced, and SOP tracking tolerance increased. In [48,49], the authors introduced a method to choose variable step size per coe cient based on the feedback error or link SNR.…”

Section: Impact Of Step Size On Snr and Tradeo S In Presence Ofmentioning

confidence: 99%

Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise

Abdo

D’Amours

2019

Journal of Computer Networks and Communications

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In this article, we analyze the performance of adaptive filtering in the context of dual-polarization coherent optical flexible bit-rate transceivers. We investigate the ability of different adaptive algorithms to track fast state-of-polarization (SOP) transients in the presence of colored noise. Colored noise exists due to the concatenation of Wavelength Selective Switches (WSSs) and polarization dependent loss (PDL) which can be considered as spatially dependent noise. We consider the use of different modulation formats, and the practical limitation of error signal feedback delay in decision-directed adaptive filters is also taken into account. The back-to-back required signal-to-noise ratio (RSNR) penalty that can be tolerated determines the maximum SOP rate of change that can be tracked by the adaptive filters as well as the filter’s adaptive step size. We show that the recursive least squares algorithm, using the covariance matrix as an aggressive “step size,” has a much better convergence speed compared to the least mean squares (LMS) and normalized LMS (NLMS) algorithms in the presence of colored noise in the fiber. However, the three algorithms have similar tracking capabilities in the absence of colored noise.

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Multi-format 800 – 1600 Gb/s coherent transceiver for inter-data centre interconnects over SMF

Torres‐Ferrera

Gutiérrez-Castrejón

Tomkos

2017

2017 19th International Conference on Transparent Optical Networks (ICTON)

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Reduction of MIMO-FIR taps via SOP-estimation in stokes space for 100 Gbps short reach applications

Cited by 4 publications

References 6 publications

Advanced and flexible multi-carrier receiver architecture for high-count multi-core fiber based space division multiplexed applications

Advanced and flexible multi-carrier receiver architecture for high-count multi-core fiber based space division multiplexed applications

Adaptive Filtering in Optical Coherent Flexible Bit-Rate Receivers in the Presence of State-of-Polarization Transients and Colored Noise

Multi-format 800 – 1600 Gb/s coherent transceiver for inter-data centre interconnects over SMF

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