Figure 39: Examples of the sum quantum noise power (double-sided) spectral densities of the
resonance-tuned interferometers with the single filter cavity based pre- and post-filtering. Left:
pre-filtering, see Figure 37 (left); dashes – 10 dB squeezing, , ideal frequency-dependent
squeezing angle (404); thin solid – 10 dB squeezing, , numerically-optimized
lossy pre-filtering cavity with . Right: post-filtering, see
Figure 37 (right); dashes: 10 dB squeezing, , ideal frequency-dependent homodyne
angle (407); thin solid – 10 dB squeezing, , numerically optimized lossy post-filtering cavity
with . In both panes (for the comparison): ‘Ordinary’ – no squeezing,
; ‘Squeezed’: 10 dB squeezing, , 
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