Feedback Regimes of LFI Sensors: Experimental Investigations.

While the initial spectral line widths were limited by the resolution (0.07 nm) (FWHM ∼0.06 nm for both lasers) of the spectral analyser, as we approached strong feedback, the peaks noticeably broadened for both lasers and were quite significant, with both lasers broadening at the FWHM to around ∼0.09 nm (∼37 GHz).

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