Experimental Evaluation of Frequency Characteristics of Gain-saturated EDFA for Suppression of Signal Fluctuation in Terrestrial Free-space Optical Communication Systems

Yoo Seok Jeong, Chul Han Kim

Research output: Contribution to journalArticlepeer-review

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 fre-quencies. 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.

Original languageEnglish
Pages (from-to)28-32
Number of pages5
JournalCurrent Optics and Photonics
Volume7
Issue number1
DOIs
StatePublished - Feb 2023

Keywords

  • Erbium-doped fiber
  • Free-space optical communication

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