IM/DD-Based 112-Gb/s/lambda PAM-4 Transmission Using 18-Gbps DML

Single-channel 112-Gb/s PAM-4 transmission based on low-cost intensity modulation and direct detection (IM/DD) optics is experimentally demonstrated over 1-km standard single-mode fiber. By employing a digital precompensation, duobinary encode/decoding with PAM-4 signal and 7-level training-sequence...

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Bibliographic Details
Published in:IEEE Photonics Journal
Main Authors: Chao Yang, Rong Hu, Ming Luo, Qi Yang, Cai Li, Haibo Li, Shaohua Yu
Format: Article in Journal/Newspaper
Language:English
Published: IEEE 2016
Subjects:
Direct Detection
PAM-4
DML
Applied optics. Photonics
TA1501-1820
Optics. Light
QC350-467
Lambda
Online Access:https://doi.org/10.1109/JPHOT.2016.2555621
https://doaj.org/article/476aa503705e4d3aac5bc3b2d8fa6941
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Summary:Single-channel 112-Gb/s PAM-4 transmission based on low-cost intensity modulation and direct detection (IM/DD) optics is experimentally demonstrated over 1-km standard single-mode fiber. By employing a digital precompensation, duobinary encode/decoding with PAM-4 signal and 7-level training-sequence-aided least mean square (TS-LMS) algorithm, we successfully achieve a receiver sensitivity of about -2 dBm with 7% overhead HD-FEC. Chirp management is applied at the transmitter side to extend the reach to 1 km for transmission at 1500 nm. This is the first demonstration, to the best of our knowledge, that 112-Gb/s PAM-4 modulation is achieved using only a 18-GHz (3-dB-bandwidth) commercial directly modulated laser. The method proposed in this paper is both bandwidth and computationally efficient, which is thought to be feasible in the low-cost short-reach optical applications.

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