Fig. 1: Structure of two cascaded MZM (MZM, Mach-Zehnder modulator)-OEOs (OEOs, optoelectronic oscillators) and optical spectra. | Communications Engineering

Fig. 1: Structure of two cascaded MZM (MZM, Mach-Zehnder modulator)-OEOs (OEOs, optoelectronic oscillators) and optical spectra.

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

Fig. 1

a Each stage of MZM-OEO includes a 40-GHz MZM, a 25-GHz photodiode, two 25-GHz electrical amplifiers, a 25-GHz BPF (BPF, band-pass filter), and an OCNR (OCNR, optical carrier-to-noise ratio) enhancement setting. b Optical spectra produced by two cascaded MZM-OEOs with (w/) and without (w/o) two sets of OCNR enhancement settings. DFB LD distributed feedback laser diode, PD photodiode, DI delay interferometer, EDFA erbium-doped fibre amplifier, OBPF optical band-pass filter.

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