Abstract
A linear phase-modulated photonic link with the dispersion-induced power fading effect suppressed based on optical carrier band (OCB) processing is proposed. By introducing a proper phase shift to the OCB, the third-order intermodulation distortion (IMD3) component of the signal transmitted over a length of fiber is effectively suppressed, while the fundamental component is shifted to be away from the notch point of the transmission response. The IMD3 and the dispersion-induced power fading effect are effectively suppressed simultaneously to realize a linear phase-modulated photonic link, and the simplicity is preserved. Theoretical analyses are taken and an experiment is carried out. Simultaneous suppression of IMD3 and dispersion-induced power fading effect is achieved. An improvement of larger than 10 dB in third-order spurious-free dynamic range (SFDR3) for both the RF frequency around the notch point and the peak point of the transmission response curve for a 20-km link is realized, as compared with the traditional phase-modulated photonic link without the OCB processing.
Highlights
Analog photonic links (APLs) have attracted wide attentions due to its possibility in both commercial and military applications with the advantages of low loss, wide working bandwidth, light weight and immunity to electromagnetic interference [1,2]
The spur-free dynamic range (SFDR) is usually restricted by nonlinear distortions, among which the third-order intermodulation distortion (IMD3) is the primary limit of the sub-octave analog photonic link, since it is close to the RF carrier and cannot be removed by filters [3]
Direct optical processing methods have been proposed to realize linearized phase-modulated photonic link [12,13], since the phasemodulated analog photonic link is free of bias drifting problem and has the advantages of the linear phase modulation process compared with the intensity-modulated photonic link [14]
Summary
Analog photonic links (APLs) have attracted wide attentions due to its possibility in both commercial and military applications with the advantages of low loss, wide working bandwidth, light weight and immunity to electromagnetic interference [1,2]. Photonic approaches using direct optical processing have been proposed to realize the IMD3 suppression [10,11]. Few works have been done considering both the linearity and the dispersion-induced power fading effect in a photonic analog link. We have proposed a linear phase-modulated photonic link based on OCB processing, which solves the dispersion-induced power fading problem simultaneously [15]. We perform a comprehensive theoretical and experimental study on the linear phase-modulated photonic link with the dispersion-induced power fading effect suppressed based on OCB processing. The values of third-order spurious-free dynamic range (SFDR3) are larger than 102 dB·Hz2/3 for the RF frequencies around both the notch point and the peak point of the transmission response curve for a 20-km link, indicating a more than 10-dB improvement in SFDR3 as compared with the traditional phase-modulated photonic link without the OCB processing
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