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Mach–Zehnder style, spectral interferometer experimental setup; SOA, semiconductor optical amplifier; DUT, device under test; BS, beam splitter; L, coupling lens; M, mirror; VOD, variable optical delay; and OSA, optical spectrum analyzer.
Spectral interferogram. Group delay is obtained by determining the change in fringe spacing across the spectrum.
WT of spectral interferogram. The maximum at each wavelength value corresponds to the group delay.
QD SOA spectral density at measured injection currents.
Group delay at measured injection currents.
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