Table 1 The optical power level at key points within the setup.

From: Two-way free-space optics-based interface between fibre and 5G communication employing polarisation-orthogonal modulation

Downstream

Key points within the setup

Output of MZM

Output of EDFA

Input of 25 km SMF

Output of 25 km SMF

Output of 1 km FSO Link

Optical power level (dBm)

−3.2

16.2

12.2

5.8

3.2

Upstream

Key points within the setup

Output of MZM

Output of EDFA

Input of 1 km FSO Link

Output of 1 km FSO Link

Output of 25 km SMF

Optical power level (dBm)

−3.4

16.1

12.2

9.6

3.2

  1. The downstream/upstream optical power level at key points within the setup, such as the output of MZM (MZM, Mach–Zehnder modulator), the output of EDFA (EDFA, erbium-doped fibre amplifier), the input and output of 25 km SMF (SMF, single-mode fibre), and the input and output of 1 km FSO (FSO, free-space optics) link.
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