Application of Kramers–Kronig receiver in SSB-OFDM-RoF link

Yuancheng Cai; Yun Ling; Xiang Gao; Bo Xu; Kun Qiu

doi:10.3788/COL201917.010605

Journals >Chinese Optics Letters >Volume 17 >Issue 1 >Page 010605 > Article

Chinese Optics Letters
Vol. 17, Issue 1, 010605 (2019)

Application of Kramers–Kronig receiver in SSB-OFDM-RoF link

Yuancheng Cai, Yun Ling^*, Xiang Gao, Bo Xu, and Kun Qiu

Author Affiliations

Key Laboratory of Optical Fiber Sensing and Communications, Ministry of Education, University of Electronic Science and Technology of China, Chengdu 611731, China

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DOI: 10.3788/COL201917.010605 Cite this Article Set citation alerts

Yuancheng Cai, Yun Ling, Xiang Gao, Bo Xu, Kun Qiu. Application of Kramers–Kronig receiver in SSB-OFDM-RoF link[J]. Chinese Optics Letters, 2019, 17(1): 010605 Copy Citation Text

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Abstract

We propose and investigate the use of a Kramers–Kronig (KK) receiver in a single sideband orthogonal frequency division multiplexing radio over fiber (SSB-OFDM-RoF) link based on an optical remote heterodyne solution. This scheme is effective in eliminating the signal-to-signal beating interference introduced by square-law detection of a photo-detector in an SSB-OFDM-RoF link. We extensively study the influences of different carrier-to-signal power ratios (CSPRs), laser linewidths, and transmission distances on our proposed scheme. It is proved that the KK-based receiver can reduce optimal CSPR by more than 5 dB and provide about 1.1 dB gain over the conventional mixer-based receiver scheme with CSPR of 11 dB after 75 km fiber transmission.

c_{i} (t) = {\begin{cases} s_{i} (t) & ({| s_{i} (t) |}^{2} \leq T), \\ \sqrt{\frac{T}{{| s_{i} (t) |}^{2}}} \cdot s_{i} (t) & ({| s_{i} (t) |}^{2} > T), \end{cases}

(1)

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E_{out} = E_{LO} + E_{s} (t) = [A + c (t) \exp (j 2 π f_{RF} t)] \cdot \exp (j 2 π f_{LO} t),

(2)

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i (t) = η {{| A |}^{2} + 2 R e [A \cdot c (t) \exp (j 2 π f_{RF} t)] + {| c (t) |}^{2}},

(3)

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i_{RF} (t) = i (t) * h (t),

(4)

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φ (t) = \frac{1}{2} p . v . \int_{- \infty}^{+ \infty} \frac{\ln [I_{RF} (t^{'})]}{π (t - t^{'})} d t^{'} = H {\ln [\sqrt{I_{RF} (t)}]}, s^{'} (t) = {\sqrt{I_{RF} (t)} \exp [j φ (t)] - M} \exp (- j 2 π f_{RF} t),

(5)

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Yuancheng Cai, Yun Ling, Xiang Gao, Bo Xu, Kun Qiu. Application of Kramers–Kronig receiver in SSB-OFDM-RoF link[J]. Chinese Optics Letters, 2019, 17(1): 010605

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