Direct-detection OFDM-QPSK system performance improvement enabled by DFT spread and receiver-based ISFA algorithm

Jie Su; Xinying Li; Jianjun Yu

doi:10.3788/COL201614.050608

Journals >Chinese Optics Letters >Volume 14 >Issue 5 >Page 050608 > Article

Chinese Optics Letters
Vol. 14, Issue 5, 050608 (2016)

Direct-detection OFDM-QPSK system performance improvement enabled by DFT spread and receiver-based ISFA algorithm

Jie Su^*, Xinying Li, and Jianjun Yu

Author Affiliations

Education Ministry Key Laboratory of Electromagnetic Wave Information Science, Information Science and Engineering School, Fudan University, Shanghai 200433, China

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DOI: 10.3788/COL201614.050608 Cite this Article Set citation alerts

Jie Su, Xinying Li, Jianjun Yu. Direct-detection OFDM-QPSK system performance improvement enabled by DFT spread and receiver-based ISFA algorithm[J]. Chinese Optics Letters, 2016, 14(5): 050608 Copy Citation Text

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Abstract

We experimentally demonstrate a direct-detection orthogonal-frequency-division-multiplexing quadrature-phase-shift-keying (OFDM-QPSK) system that is capable of delivering a 32 Gbaud OFDM-QPSK signal over 7 km single-mode fiber-28 (SMF-28). Intra-symbol frequency-domain averaging (ISFA) channel response estimation is applied to suppress in-band noise, while discrete Fourier transform-spread (DFT-spread) is used to reduce the peak-to-average power ratio (PAPR) of the transmitted OFDM signal. With the aid of ISFA-based channel estimation and PAPR reduction enabled by DFT-spread, the bit-error ratio of the system after 7 km SMF-28 transmission can be improved from

2 \times 10^{3}

to error-free when the received optical power is

8.5 dBm

PAPR \leq 1 + \frac{2}{N} \cdot \sum_{k = 1}^{N - 1} | R_{k} |,

(1)

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[\begin{matrix} a (k) & b (k) \\ c (k) & d (k) \end{matrix}] = [\begin{matrix} t_{1 x}^{'} (k) / t_{x} (k) & t_{2 x}^{'} (k) / t_{y} (k) \\ t_{1 y}^{'} (k) / t_{x} (k) & t_{2 y}^{'} (k) / t_{y} (k) \end{matrix}],

(2)

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{[\begin{matrix} a (k^{'}) & b (k^{'}) \\ c (k^{'}) & d (k^{'}) \end{matrix}]}_{ISFA} = \frac{1}{\min (k_{\max}, k^{'} + m) - \max (k_{\min}, k^{'} - m) + 1} \sum_{k = k^{'} - m}^{k^{'} + m} [\begin{matrix} a (k) & b (k) \\ c (k) & d (k) \end{matrix}] .

(3)

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Jie Su, Xinying Li, Jianjun Yu. Direct-detection OFDM-QPSK system performance improvement enabled by DFT spread and receiver-based ISFA algorithm[J]. Chinese Optics Letters, 2016, 14(5): 050608

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