Abstract

Frequency characteristics of gain-saturated erbium-doped fiber amplifier (EDFA) are experimentally evaluated to mitigate the optical signal fluctuation induced by atmospheric turbulence in terrestrial free-space optical communication systems. Here, an acousto-optic modulator (AOM) is used to emulate optical signal fluctuations induced by atmospheric turbulence. The waveform which is generated in proportion to the refractive-index structural parameters is used to drive the AOM at various periodic frequencies. Thus, the dependence of the signal fluctuation suppression on the frequency is evaluated. The experiment is conducted using a periodic frequency sweep of the AOM driving voltage waveform and signal input power variation of the amplifier. It is observed that a low periodic frequency and high input signal power effectively suppress the optical signal fluctuation. This study evaluates the experimental results from the high-pass filter and gain-saturation characteristics of the EDFA.

© 2023 Optical Society of Korea

Optical adaptive power transmission using APC-EDFA for turbulence-tolerant FSO communications

Yan-Qing Hong, Gang Li, and Zhen-Yu Liu
Opt. Express 29(15) 23777-23785 (2021)

Slant-path coherent free space optical communications over the maritime and terrestrial atmospheres with the use of adaptive optics for beam wavefront correction

Ming Li, Wenbo Gao, and Milorad Cvijetic
Appl. Opt. 56(2) 284-297 (2017)

All-optical gain-clamped EDFA using external saturation signal for burst-mode upstream in TWDM-PONs

Han Hyub Lee, Jong Hyun Lee, and Sang Soo Lee
Opt. Express 22(15) 18186-18194 (2014)

Design and experimental demonstration of 8-QAM coherent free-space optical communication using amplitude compensation and phase recovery

Lin Li, Tianwen Geng, Zhiyong Wu, Shijie Gao, and Xueliang Li
Appl. Opt. 60(18) 5345-5353 (2021)

Performance of mode diversity reception of a polarization-division-multiplexed signal for free-space optical communication under atmospheric turbulence

Manabu Arikawa and Toshiharu Ito
Opt. Express 26(22) 28263-28276 (2018)