A linearized optical single-sideband modulation RoF link with tunable optical carrier-to-sideband ratio

• Published in: Optics communications Vol. 511; p. 127991
• Main Authors: Wang, Ruiqiong, Fan, Yangyu, Tan, Jiajun, Shi, Fangjing, Zhai, Weile, Tan, Qinggui, Gao, Yongsheng
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.05.2022
• Subjects: Optical carrier-to-sideband ratio; Optical single-sideband; Periodic power fading; Radio over fiber; Spurious-free dynamic range; Third-order intermodulation distortion; Periodic power fading; Third-order intermodulation distortion; Spurious-free dynamic range; Optical single-sideband; Optical carrier-to-sideband ratio; Radio over fiber
• ISSN: 0030-4018; 1873-0310
• DOI: 10.1016/j.optcom.2022.127991

In this paper, an optical single-sideband (OSSB) modulation radio over fiber (RoF) link with tunable optical carrier-to-side-band ratio (OCSR) and simultaneous third-order intermodulation distortion (IMD3) and power fading suppression is proposed. In the proposed link, a phase-modulated signal and an optical carrier are polarization multiplexed using a Sagnac loop. The periodic power fading caused by chromatic dispersion is avoided by filtering the lower sideband. By adjusting the polarization state, the IMD3 is suppressed and a tunable OCSR can be achieved. Compared with the traditional Mach–Zehnder modulator (MZM) based link, the spurious free dynamic range (SFDR) of the proposed link is improved by more than 18 dB with different RF frequencies. In the broadband characteristic test, the proposed link exhibits lower error vector amplitude (EVM) and higher adjacent channel power ratio (ACPR) in a larger input RF power range. •Third-order intermodulation distortions and periodic power fading caused by chromatic dispersion can be simultaneously suppressed.•Optical Carrier-to-sideband Ratio of the proposed link is tunable.•The proposed link can also realize wavelength reuse and full-duplex transmission.•An increase of more than 18 dB in SFDR is achieved under different RF frequencies.•Potential applications in the next generation wireless communication systems.