Linearization of microwave photonic link based on nonlinearity of distributed feedback laser

Zi-jian Kang; Yi-ying Gu; Wen-wu Zhu; Feng Fan; Jing-jing Hu; Ming-shan Zhao

doi:10.1117/1.OE.55.2.026115

18 February 2016 Linearization of microwave photonic link based on nonlinearity of distributed feedback laser

Zi-jian Kang, Yi-ying Gu, Wen-wu Zhu, Feng Fan, Jing-jing Hu, Ming-shan Zhao

Author Affiliations +

Optical Engineering, Vol. 55, Issue 2, 026115 (February 2016). https://doi.org/10.1117/1.OE.55.2.026115

Abstract

A microwave photonic link (MPL) with spurious-free dynamic range (SFDR) improvement utilizing the nonlinearity of a distributed feedback (DFB) laser is proposed and demonstrated. First, the relationship between the bias current and nonlinearity of a semiconductor DFB laser is experimentally studied. On this basis, the proposed linear optimization of MPL is realized by the combination of the external intensity Mach–Zehnder modulator (MZM) modulation MPL and the direct modulation MPL with the nonlinear operation of the DFB laser. In the external modulation MPL, the MZM is biased at the linear point to achieve the radio frequency (RF) signal transmission. In the direct modulation MPL, the third-order intermodulation (IMD3) components are generated for enhancing the SFDR of the external modulation MPL. When the center frequency of the input RF signal is 5 GHz and the two-tone signal interval is 10 kHz, the experimental results show that IMD3 of the system is effectively suppressed by 29.3 dB and the SFDR is increased by 7.7 dB.

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Zi-jian Kang, Yi-ying Gu, Wen-wu Zhu, Feng Fan, Jing-jing Hu, and Ming-shan Zhao "Linearization of microwave photonic link based on nonlinearity of distributed feedback laser," Optical Engineering 55(2), 026115 (18 February 2016). https://doi.org/10.1117/1.OE.55.2.026115

Published: 18 February 2016

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