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A Frequency-Doubling Optoelectronic Oscillator using a Three-Arm Dual-Output Mach-Zehnder Modulator
Yuhua Chong,Chun Yang,Xianghua Li,Quanyi Ye 한국광학회 2013 Current Optics and Photonics Vol.17 No.6
This paper proposes a frequency-doubling optoelectronic oscillator employing a novel three-arm dualoutputMach-Zehnder modulator (MZM). One output of the MZM generates the fundamental-frequencysignal which is recycled by the microwave optical fiber link for oscillation, and the other output cangenerate the frequency-doubled signal. Experiment was conducted using a commercial two-arm MZM, aphase modulator, and an optical fiber link of 89 meters in length. A 19-GHz frequency-doubled signalwas successively obtained with fundamental signal suppression more than 36 dB.
Dynamic Range Improvement of IM-DD Optical Link using Dual-Wavelength Dual-Parallel Modulation
Li Xianghua,Zhou Zhenghua,Chong Yuhua,Yang Chun 한국광학회 2014 Current Optics and Photonics Vol.18 No.4
In this paper, we present an incoherent dual-parallel modulation linearized optical link employing two different optical wavelengths. Comparing with previous dual-parallel modulation, this linearization method prevents the recreation of distortion products and can be readily implemented. Furthermore, a dual-wavelength dual-parallel modulation linearized optical link constructed with the commercially available devices is experimentally demonstrated with a spurious-free dynamic range of 122.5 dB.Hz4/5. More than 25 dB suppression of the intermodulation distortion, 15.6 dB improvement of spurious-free dynamic range and 1.5 dB improvement of compression dynamic range are achieved after linearization.
Li Xianghua,Ye Quanyi,Chong Yuhua,Zhou Zhenghua,Yang Chun 한국광학회 2014 Current Optics and Photonics Vol.18 No.3
This paper presents a new method for measuring the half-wave voltage Vπ of an electro-optic phase modulator based on a phase-modulated photonic link with interferometric demodulation. By using this method, the Vπ can be obtained with the RF voltage amplitude input required to achieve 1-dB gain compression of link and the differential delay of a Mach-Zehnder interferometer. We measure the Vπ of a commercial phase modulator by using the presented method and the carrier/the first sideband intensity ratio method. Furthermore, we compare the two measurements with the typical value provided by the manufacturer. The experiment shows that this novel measurement method is feasible, straightforward, and accurate.