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Digital Pre- and Post-Equalization for C-Band 112-Gb/s PAM4 Short-Reach Transport Systems

Insufficient system bandwidth and chromatic dispersion (CD) of fiber are major limitations for high-speed four-level pulse amplitude modulation (PAM4) direct detection systems. In this article, we investigate C-band 112-Gb/s PAM4 optical transport systems over 10-km and 20-km standard single-mode fiber (SSMF) transmission, which suffers from both bandwidth limitation and CD-induced power fading. Advanced digital signal processing techniques are proposed to handle those channel distortions. At the transmitter, a low-complexity 1 + α Z-1 finite impulse response (FIR) filter coarsely pre-compensates system bandwidth without a preliminary channel estimation. At the receiver, a modified feed-forward equalizer and decision feedback equalizer (FFE-DFE) is employed to compensate residual insufficient bandwidth and CD-induced power fading. Moreover, a novel multi-symbols joint decision is proposed for receiver-side FFE-DFE to mitigate symbol error propagation and correct possible previous error symbols. Experimental results show that the proposed preequalization technique exhibits a better transmission performance, which reduces bit error ratio (BER) from 3.3 × 10 -3 to 5.5 × 10 -4 for optical back to back transmission. As for 10-km transmission case, FFE-DFE with 5-symbols joint decision achieves a BERof 7.3 × 10 -5 , which is betterthanthe BERof 1.6 × 10 -4 with ideal error-propagation-free FFE-DFE (EPF-FFE-DFE). Furthermore, for 20-km transmission scenario, FFE-DFE with 8-symbols joint decision achieves a BER of 6.0 × 10 -4 , which is also a superior result than the BER of 9.1 × 10 -4 with EPF-FFE-DFE.

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Informasi Detail

Judul Seri

JOURNAL OF LIGHTWAVE TECHNOLOGY; Vol.38 No.17 September 1 2020

No. Panggil

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Penerbit

: .,

Deskripsi Fisik

p. 4683 - 4690

Bahasa

English

ISBN/ISSN

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Klasifikasi

-

Tipe Isi

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Tipe Media

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Tipe Pembawa

-

Edisi

-

Subjek

PRE-EQUALIZATION
ERROR PROPAGATION
POST-EQUALIZATION
FOUR-LEVEL PULSE AMPLITUDE MODULATION (PAM4)

Info Detail Spesifik

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Pernyataan Tanggungjawab

Xizi Tang, Yaojun Qiao, You-Wei Chen, Yueming Lu, Gee-Kung Chang

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