Compensation of the Dispersion-Induced Power Fading in an Analog Photonic Link Based on PM–IM Conversion in a Sagnac Loop

Gao, Yongsheng; Wen, Aijun; Liu, Ling; Tian, Shuting; Xiang, Shuiying; Wang, Yong

doi:10.1109/jlt.2015.2420658

Cited by 47 publications

(18 citation statements)

References 20 publications

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“…The Sagnac loop has been described in our previous work [30]. It consists of an optical circular (OC), a polarization beam splitter (PBS) and a 90 0 polarization rotation (PR).…”

Section: Suppression Of the Optical Carrier Using Sagnac Loopmentioning

confidence: 99%

“…However, the realization of SSB modulation often requires an electrical phase shifter (or hybrid coupler) [21], [26], or an optical filter [27], [28], which will increase the implementation difficulty for wideband applications. Some new DSB modulation techniques have also been proposed recently [23], [29], [30], where the frequency response of the system can be controlled to compensate the power fading.…”

Section: Introductionmentioning

confidence: 99%

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Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Gao

Wen

Wu³

et al. 2016

J. Lightwave Technol.

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The conversion gain of a photonic microwave mixer is often limited by the large carrier of the modulated optical signal, and may be further deteriorated by the chromatic dispersion-induced power fading after transmission over fiber. To solve this problem, an efficient photonic microwave mixer based on a dual-electrode Mach-Zehnder modulator (DEMZM) is proposed in this paper. The carrier of the modulated optical signal is suppressed by bidirectional use of the modulator in a Sagnac loop, and a 21.9-dB improvement of the conversion gain is achieved in the experiment. In addition, the frequency response of the mixer after transmission over fiber can be tuned by simply adjusting the direct current (DC) bias of the modulator. This feature is applied to compensate the dispersion-induced power fading of the mixing product. In the proof of concept experiment, a vector signal centered at 2.4 GHz is up-converted to 16 GHz and transmitted over 25-km single mode fiber (SMF). After power compensation, the constellation diagram, error vector magnitude (EVM) and receiver sensitivity are significantly improved, and are almost as good as that without fiber transmission.Index Terms-Chromatic dispersion, microwave photonics, microwave mixer, photonic frequency conversion, power fading.

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“…The Sagnac loop has been described in our previous work [30]. It consists of an optical circular (OC), a polarization beam splitter (PBS) and a 90 0 polarization rotation (PR).…”

Section: Suppression Of the Optical Carrier Using Sagnac Loopmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Gao

Wen

Wu³

et al. 2016

J. Lightwave Technol.

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“…However, they are effective only for a specific frequency range; thus, it is difficult to apply to wideband signals. Another DSB-based approach is utilizing phase modulation to intensity modulation (PM-IM) conversion through fiber transmission [26]- [28]. Ref.…”

Section: Dispersion-induced Power Fading Compensation Techniquesmentioning

confidence: 99%

“…Ref. [26] achieves the fading compensation by adjusting the state of polarization (SOP). However, this scheme can also be effective for a specific frequency like Refs.…”

Section: Dispersion-induced Power Fading Compensation Techniquesmentioning

confidence: 99%

IF-over-Fiber Technology Aiming at Efficient Bandwidth Utilization and Perfect Centralized Control for Next-Generation Mobile Fronthaul Links in C-RAN Architectures

Ishimura

Kim

Tanaka

et al. 2018

IEICE Trans. Commun.

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SUMMARYThe intermediate frequency-over-fiber (IFoF) technology has attracted attention as an alternative transmission scheme to the functional split for the next-generation mobile fronthaul links due to its high spectral efficiency and perfect centralized control ability. In this paper, we discuss and clarify network architectures suited for IFoF, based on its advantages over the functional split. One of the major problems for IFoF transmission is dispersion-induced RF power fading, which limits capacity and transmission distance. We introduce our previous work, in which high-capacity and long-distance IFoF transmission was demonstrated by utilizing a parallel intensity/phase modulators (IM/PM) transmitter which can effectively avoid the fading. The IFoF technology with the proposed scheme is well suited for the long-distance mobile fronthaul links for the 5th generation (5G) mobile system and beyond. key words: Centralized RAN (C-RAN), mobile fronthaul, functional split, IF-over-fiber, dispersion-induced RF power fading.

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“…Then, the two optical signals are assembled again at the PBS, as shown in Figure (d), and the polarization state of the combined optical signal can be adjusted by PC4. Assuming the angle between one principal axis of the PBS and principal axis of the polarizer is

α

, and the phase difference between

E_{CK}

and

E_{CCK}

θ

, the output light wave at the polarizer can be written as

\begin{matrix} E_{pol} true(t true) = E_{CK} \cos α + E_{CCK} \sin α \exp true(j θ true) \\ = \cos α true[E_{CK} + E_{CCK} \tan α \exp true(j θ true) true] \\ \approx \frac{j}{\sqrt{2}} E_{0} \exp true(j ω_{c} t true) J_{1} true(m_{1} true) \cos α true{\begin{matrix} left \\ true[J_{0} true(m_{2} true) - J_{2} true(m_{2} true) + \tan α \exp true(j θ true) true] \\ \cdot true[\exp true(j ω_{LO} t true) - \exp true(- j ω_{LO} t true) true] \\ + J_{2} true(m_{2} true) true[\exp true(j 3 ω_{LO} t true) - \exp true(- j 3 ω_{LO} t true) true] \end{matrix} true} \end{matrix}

…”

Section: Principlementioning

confidence: 99%

Photonic frequency sextupling scheme based on two intensity modulators and a Sagnac loop

Zheng

Wen

Gao

et al. 2017

Microw. Opt. Technol. Lett.

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A photonic scheme to generate frequency sextupled microwave signal is proposed and experimentally demonstrated. An intensity modulator (IM) and a Sagnac loop with another IM imbedded inside are cascaded in the scheme. A light wave is modulated by a local oscillator (LO) signal in the first IM at the minimum transmission point to generate the ±1st‐order sidebands, and the modulated light wave is then sent to the Sagnac loop. The IM in the Sagnac loop is operating at the maximum transmission point and is driven by the same LO signal. The optical signal at the output of the Sagnac loop mainly contains ±3rd‐order sidebands. In the experiment, a 15.1‐dB electrical spurious suppression ratio (ESSR) is observed and no extra phase noise is introduced. In addition, the proposed system has no optical or electrical filter so that the generated frequency of the system can be tuned flexibly. © 2017 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:853–857, 2017

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Compensation of the Dispersion-Induced Power Fading in an Analog Photonic Link Based on PM–IM Conversion in a Sagnac Loop

Cited by 47 publications

References 20 publications

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

Efficient Photonic Microwave Mixer With Compensation of the Chromatic Dispersion-Induced Power Fading

IF-over-Fiber Technology Aiming at Efficient Bandwidth Utilization and Perfect Centralized Control for Next-Generation Mobile Fronthaul Links in C-RAN Architectures

Photonic frequency sextupling scheme based on two intensity modulators and a Sagnac loop

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