Experimental Investigation of Real Time 10 Gbit/s MLSE Equalizer Using 4-States and 16-States Viterbi Detector

Fritzsche, D.; Breuer, D.; Schurer, L.; Ehrhardt, A.; Oeruen, Hamdi; Schäffer, C.

doi:10.1109/glocom.2009.5425833

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…Some commercial implementations of VD at 10 Gb/s with 4, 8, and 16 states are available in 90 nm CMOS technology [31][32][33]. It should be possible to implement VD's with 64 or 128 states by using the available 28 nm technology.…”

Section: Endnotesmentioning

confidence: 99%

Maximum Likelihood Sequence Detection Receivers for Nonlinear Optical Channels

Maggio

Hueda

Agazzi³

2015

Journal of Electrical and Computer Engineering

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The space-time whitened matched filter (ST-WMF) maximum likelihood sequence detection (MLSD) architecture has been recently proposed (Maggio et al., 2014). Its objective is reducing implementation complexity in transmissions over nonlinear dispersive channels. The ST-WMF-MLSD receiver (i) drastically reduces the number of states of the Viterbi decoder (VD) and (ii) offers a smooth trade-off between performance and complexity. In this work the ST-WMF-MLSD receiver is investigated in detail. We show that the space compression of the nonlinear channel is an instrumental property of the ST-WMF-MLSD which results in a major reduction of the implementation complexity in intensity modulation and direct detection (IM/DD) fiber optic systems. Moreover, we assess the performance of ST-WMF-MLSD in IM/DD optical systems with chromatic dispersion (CD) and polarization mode dispersion (PMD). Numerical results for a 10 Gb/s, 700 km, and IM/DD fiber-optic link with 50 ps differential group delay (DGD) show that the number of states of the VD in ST-WMF-MLSD can be reduced ∼4 times compared to an oversampled MLSD. Finally, we analyze the impact of the imperfect channel estimation on the performance of the ST-WMF-MLSD. Our results show that the performance degradation caused by channel estimation inaccuracies is low and similar to that achieved by existing MLSD schemes (∼0.2 dB).

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Section: Endnotesmentioning

confidence: 99%