FFT-Size Efficient 4096-QAM OFDM for Low-Cost DML-Based IMDD System | IEEE Journals & Magazine | IEEE Xplore

FFT-Size Efficient 4096-QAM OFDM for Low-Cost DML-Based IMDD System

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Measured EVM curves versus subcarrier index and the corresponding 4096-QAM constellation diagrams for (a), (c) eB2B and (b), (d) post 10-km SSMF transmission.
Impact Statement:To achieve higher transmission bitrate for short-reach applications such as data centers and optical access networks in this paper, we demonstrated, for the first time, t...Show More

Abstract:

In this paper, we have experimentally demonstrated the transmission of the 4096-quadrature amplitude modulation (4096-QAM)-encoded optical orthogonal frequency division m...Show More
Impact Statement:
To achieve higher transmission bitrate for short-reach applications such as data centers and optical access networks in this paper, we demonstrated, for the first time, the transmission of the 4096-QAM-encoded FFT-size efficient OFDM signals over 10-km SSMF in a low-cost DML-based IMDD optical communication system, with an SE up to 9.5-bit/s/Hz. We also investigated the effect of linewidth on the transmission performance of the FFT-size efficient 100G 4096-QAM-OFDM through numerical simulation.

Abstract:

In this paper, we have experimentally demonstrated the transmission of the 4096-quadrature amplitude modulation (4096-QAM)-encoded optical orthogonal frequency division multiplexing (OFDM) signals in a low-cost directly modulated laser (DML)-based intensity-modulated and direct-detection (IMDD) optical communication system. To the best of our knowledge, it is the first time the highest QAM and fast fourier transform (FFT) size efficient OFDM signal with a spectral efficiency up to 9.5 bit/s/Hz transmissions over a DML-based IMDD system has been reported. The experimental results show that the 4096-QAM OFDM signal can be successfully transmitted over 10-km standard single-mode fiber (SSMF) with a bit error rate (BER) below the 20% overhead soft-decision forward error correction threshold (SD-FEC). It also shows that the FFT-size efficient optical 4096-QAM OFDM has the same BER performance as the conventional one. Moreover, the effect of laser phase noise (or linewidth) on the transmission performance of the FFT-size efficient 100G 4096-QAM-OFDM is also investigated by numerical simulation. The simulation shows that the optical 100G OFDM signals generated by 10G DML with a linewidth of 20 MHz can be successfully transmitted over 2 km SSMF with the BER under the SD-FEC threshold of 2.4 × 10-2.
Measured EVM curves versus subcarrier index and the corresponding 4096-QAM constellation diagrams for (a), (c) eB2B and (b), (d) post 10-km SSMF transmission.
Published in: IEEE Photonics Journal ( Volume: 8, Issue: 5, October 2016)
Article Sequence Number: 7804010
Date of Publication: 26 August 2016

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