Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser

Fan Li; Jianjun Yu; Yuan Fang; Ze Dong; Xinying Li; Lin Chen

doi:10.1364/OE.22.008742

Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser

Fan Li, Jianjun Yu, Yuan Fang, Ze Dong, Xinying Li, Lin Chen

Research output: Contribution to journal › Article › peer-review

54 Citations (Scopus)

Abstract

We experimentally demonstrated a 256-ary quadrature amplitude modulation (256QAM) direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system utilizing a costeffective directly modulated laser (DML). Intra-symbol frequency-domain averaging (ISFA) is applied to suppress in-band noise while the channel response estimation and Discrete Fourier Transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. The bit-error ratio (BER) of 15-Gbit/s 256QAM-OFDM signal has been measured after 20-km SSMF transmission that is less than 7% forward-error-correction (FEC) threshold of 3.8 × 10-3 as the launch power into fiber is set at 6dBm. For 11.85-Gbit/s 256QAM-OFDM signal, with the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the BER after 20-km SSMF transmission can be improved from 6.4 × 10-3 to 6.8 × 10-4 when the received optical power is -6dBm.

Original language	English
Pages (from-to)	8742-8748
Number of pages	7
Journal	Optics Express
Volume	22
Issue number	7
DOIs	https://doi.org/10.1364/OE.22.008742
Publication status	Published - 2014
Externally published	Yes

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title = "Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser",

abstract = "We experimentally demonstrated a 256-ary quadrature amplitude modulation (256QAM) direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system utilizing a costeffective directly modulated laser (DML). Intra-symbol frequency-domain averaging (ISFA) is applied to suppress in-band noise while the channel response estimation and Discrete Fourier Transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. The bit-error ratio (BER) of 15-Gbit/s 256QAM-OFDM signal has been measured after 20-km SSMF transmission that is less than 7% forward-error-correction (FEC) threshold of 3.8 × 10-3 as the launch power into fiber is set at 6dBm. For 11.85-Gbit/s 256QAM-OFDM signal, with the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the BER after 20-km SSMF transmission can be improved from 6.4 × 10-3 to 6.8 × 10-4 when the received optical power is -6dBm.",

author = "Fan Li and Jianjun Yu and Yuan Fang and Ze Dong and Xinying Li and Lin Chen",

year = "2014",

doi = "10.1364/OE.22.008742",

language = "English",

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pages = "8742--8748",

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T1 - Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser

AU - Li, Fan

AU - Yu, Jianjun

AU - Fang, Yuan

AU - Dong, Ze

AU - Li, Xinying

AU - Chen, Lin

PY - 2014

Y1 - 2014

N2 - We experimentally demonstrated a 256-ary quadrature amplitude modulation (256QAM) direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system utilizing a costeffective directly modulated laser (DML). Intra-symbol frequency-domain averaging (ISFA) is applied to suppress in-band noise while the channel response estimation and Discrete Fourier Transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. The bit-error ratio (BER) of 15-Gbit/s 256QAM-OFDM signal has been measured after 20-km SSMF transmission that is less than 7% forward-error-correction (FEC) threshold of 3.8 × 10-3 as the launch power into fiber is set at 6dBm. For 11.85-Gbit/s 256QAM-OFDM signal, with the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the BER after 20-km SSMF transmission can be improved from 6.4 × 10-3 to 6.8 × 10-4 when the received optical power is -6dBm.

AB - We experimentally demonstrated a 256-ary quadrature amplitude modulation (256QAM) direct-detection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system utilizing a costeffective directly modulated laser (DML). Intra-symbol frequency-domain averaging (ISFA) is applied to suppress in-band noise while the channel response estimation and Discrete Fourier Transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. The bit-error ratio (BER) of 15-Gbit/s 256QAM-OFDM signal has been measured after 20-km SSMF transmission that is less than 7% forward-error-correction (FEC) threshold of 3.8 × 10-3 as the launch power into fiber is set at 6dBm. For 11.85-Gbit/s 256QAM-OFDM signal, with the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the BER after 20-km SSMF transmission can be improved from 6.4 × 10-3 to 6.8 × 10-4 when the received optical power is -6dBm.

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DO - 10.1364/OE.22.008742

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SP - 8742

EP - 8748

JO - Optics Express

JF - Optics Express

IS - 7

ER -

Demonstration of DFT-spread 256QAM-OFDM signal transmission with cost-effective directly modulated laser

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