Power-efficient heterodyne radio over fiber link with laser phase noise robustness

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

doi:10.3788/COL201917.110602

Journals >Chinese Optics Letters >Volume 17 >Issue 11 >Page 110602 > Article

Chinese Optics Letters
Vol. 17, Issue 11, 110602 (2019)

Power-efficient heterodyne radio over fiber link with laser phase noise robustness

Yuancheng Cai, Xiang Gao, Yun Ling^*, 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/COL201917.110602 Cite this Article Set citation alerts

Yuancheng Cai, Xiang Gao, Yun Ling, Bo Xu, Kun Qiu. Power-efficient heterodyne radio over fiber link with laser phase noise robustness[J]. Chinese Optics Letters, 2019, 17(11): 110602 Copy Citation Text

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Abstract

A pre-coding-assisted power detection scheme for radio over fiber downlink is presented. This scheme can eliminate laser phase noise while avoiding high energy-consuming electrical carrier required in conventional power and/or envelope detection schemes. Theoretical analysis and experimental verification are performed. 0.625 Gbaud pre-coded quadrature phase-shift keying or 16 quadrature amplitude modulation signals can both be recovered by power detection without electrical carrier assistance at the receiver after 75 km fiber transmission. Not only robust against the laser phase noise, an improvement of about 5 dB in receiver sensitivity can also be achieved, as compared with the conventional power detection scheme.

c [n] = r_{n} \exp (j θ_{n}),

(1)

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s [t] = \sum_{n = - \infty}^{\infty} c [n] h_{p s} (t - n T) = r (t) \exp [j θ (t)],

(2)

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s_{p r e - c o d e d} (t) = \sqrt{r (t)} \exp (j \frac{θ^{'} (t)}{2}),

(3)

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s_{I F} (t) = \sqrt{r (t)} \cos (ω_{I F} t + \frac{θ^{'} (t)}{2}),

(4)

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E_{s} (t) \approx m \cdot s_{I F} (t) \cdot \sqrt{P_{c}} \exp [j (ω_{c} t + φ_{c} (t))],

(5)

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E_{L O} (t) = \sqrt{P_{L O}} \exp [j (ω_{L O} t + φ_{L O} (t))],

(6)

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I_{P D} (t) = R \cdot {| E_{s} (t) + E_{L O} (t) |}^{2} = M \cdot s_{I F} (t) \cos (Δ ω t + Δ φ (t)) + N \cdot r (t) \cos (2 ω_{I F} t + θ (t)) + N \cdot r (t) + P_{L O},

(7)

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{s_{R F}}^{2} (t) = P \cdot r (t) \cos (2 ω_{I F} t + θ (t)) + P \cdot r (t) + P \cdot r (t) [1 + \cos (2 ω_{I F} t + θ (t))] \cos (2 Δ ω t + 2 Δ φ (t)),

(8)

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s_{r} (t) = [r (t) \exp (j θ (t))] * h_{m} (t) = P \cdot \sum_{n = - \infty}^{\infty} c [n] h (t - n T),

(9)

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Yuancheng Cai, Xiang Gao, Yun Ling, Bo Xu, Kun Qiu. Power-efficient heterodyne radio over fiber link with laser phase noise robustness[J]. Chinese Optics Letters, 2019, 17(11): 110602

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