Power spectral density (PSD) of internal fringe signals for various configurations, compared to an ideal J band filter (black): double-pass Michelson with delay-line only (blue), single-pass Mach Zehnder with 10 m fibres and delay line (green), and single-pass Mach Zehnder with 300 m fibres and delay line (red). The fringe peak is significantly broadened by the vibrations of the delay line; the additional vibrations in the 10 m-long and the 300 m-long fibres are comparably smaller.
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