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Optical Engineering

Linearization of microwave photonic link based on nonlinearity of distributed feedback laser
Author(s): Zi-jian Kang; Yi-ying Gu; Wen-wu Zhu; Feng Fan; Jing-jing Hu; Ming-shan Zhao
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Paper 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.

Paper Details

Date Published: 18 February 2016
PDF: 4 pages
Opt. Eng. 55(2) 026115 doi: 10.1117/1.OE.55.2.026115
Published in: Optical Engineering Volume 55, Issue 2
Show Author Affiliations
Zi-jian Kang, Dalian Univ. of Technology (China)
Yi-ying Gu, Dalian Univ. of Technology (China)
Wen-wu Zhu, Dalian Univ. of Technology (China)
Feng Fan, Dalian Univ. of Technology (China)
Jing-jing Hu, Dalian Univ. of Technology (China)
Ming-shan Zhao, Dalian Univ. of Technology (China)

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