Laser linewidth measurements have been carried out using a novel form of unbalanced fibre Mach-Zehnder interferometer, in which the interference signal is frequency shifted by an optical amplifier, using a resonating electrical feedback loop. This method offers stable, high sensitivity measurement of the linewidths of coherent laser sources.
Published in:
Electronics Letters
(Volume:30
,
Issue:
2
)
Date of Publication: 20 Jan 1994