Abstract
In this paper, we propose and experimentally demonstrate a receiver-side electronic dispersion compensation (EDC) algorithm for direct-detection 56 Gbit/s on-off keying signal in C-band over 20 km dispersion-uncompensated standard single-mode fiber transmission. The proposed receiver-side EDC algorithm includes the feed-forward equalizer, post noise-whitening filter and modified iterative detection algorithm, which is originally used in spectrally efficient frequency division multiplexing systems for inter-carrier interference cancellation. Only with the aid of the proposed EDC algorithm for the compensation of power fading effect caused by bandwidth limit and chromatic dispersion, bit-error ratio below the 7% hard-decision forward error correction limit is achieved. This scheme can keep the system cost-effective and flexible, showing potentials for optical interconnects.
Highlights
Due to the features of simplicity, low cost, and small footprint that required for short-distance optical interconnects, intensity-modulation and direct-detection (IM/DD) optical communications have received more and more attention as the mainstream technology to provide key solutions to data center interconnects [1], [2]
In this paper, we propose and experimentally demonstrate a receiver-side electronic dispersion compensation (EDC) algorithm for direct-detection 56 Gbit/s on-off keying signal in C-band over 20 km dispersion-uncompensated standard single-mode fiber transmission
With the aid of the proposed EDC algorithm for the compensation of power fading effect caused by bandwidth limit and chromatic dispersion, bit-error ratio below the 7% hard-decision forward error correction limit is achieved
Summary
Due to the features of simplicity, low cost, and small footprint that required for short-distance optical interconnects, intensity-modulation and direct-detection (IM/DD) optical communications have received more and more attention as the mainstream technology to provide key solutions to data center interconnects [1], [2]. The use of feed-forward equalizer (FFE) is enough for inter-symbol interference (ISI) cancellation at the cost of in-band noise enhancement [9] It does not work well when the detected signal spectrum has spectral nulls caused by CD. With the aid of the proposed EDC algorithm for the compensation of power fading effect caused by bandwidth limit and chromatic dispersion, bit-error ratio (BER) below the 7% hard-decision forward error correction (HD-FEC) limit is achieved. This scheme can keep the system cost-effective and flexible, showing potentials for optical interconnects
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