Anritsu MS9740B - Page 180

Chapter 5 Measurement Functions
5-30
7. When Normalization at Noise Parameter is set to On, the noise level
is normalized in the wavelength range set at Noise BW to calculate
the noise level per *.* nm. SNR is calculated for this noise level.








′
=
)(
log10
,
sig
LinS
N
L
SNR
l
(dB-nm)
N’(λ
sig
): Linear value of noise normalized by Noise BW (W/nm)
N ( l
sig
) a
)(
sig
N l
′
= · NBW (W/nm)
ActRes ( l
sig
)
ActRes(λ
sig
): Actual resolution (nm) at optical signal
wavelength
NBW: Noise BW