Table 1 The optical power levels at key points in the setup

From: Bidirectional wavelength-division-multiplexing fibre-free-space optical communications using polarisation multiplexing technique and tunable optical vestigial sideband filter

Key points in the setup

Two cascaded MZM-OEOs output

MZM output

EDFA output

Output after 30 km SMF transport

Output after 1.6 km FSO Link

Tunable optical VSB filter output

Polarisation beam splitter (x-pol/y-pol) output

Optical power level (dBm)

2.8

2.2

17

9.7

4.3

3.8

3.3/3.2

  1. The optical power levels at critical points in the structure, including two cascaded MZM (MZM, Mach-Zehnder modulator)-OEOs (OEOs, optoelectronic oscillators) output, MZM output, EDFA (EDFA, erbium-doped fibre amplifier) output, the output after 30 km SMF (SMF, single-mode fibre) transport, the output after 1.6 km FSO (FSO, free-space optical) link, tunable optical VSB (VSB, vestigial sideband) filter output, and polarisation beam splitter (x-polarised/y-polarised) output.
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