3-52
Function Reference
OSNR Marker
OSNR =
Interpolating Noise
To accurately measure noise, the noise level must be determined at the signal
wavelength. The measurement cannot be directly performed because the sig-
nal power level masks the noise. To estimate the noise at the signal wave-
length, the OSA measures the noise power above and below the channel
wavelength at the predetermined offset or pits (depending on the Noise
Method selected in the Marker Setup panel). Next, the values are linearly
interpolated to determine the noise value at the channel wavelength.
Error Messages
OSNR error messages are displayed in red letters and are described below
with suggestions to correct the error.
Noise Not Found
can be displayed for two different conditions. The first
condition occurs when Pit mode is selected, and the left or right marker is
unable to find a pit using the Pit Excursion (selected in the Marker Setup
panel).
The second condition occurs when auto or manual mode is selected and the
left or right marker is outside the span. In this case, the noise measurement is
made at the span’s end point.
Center amplitude
N
a
normalized
(
)
----------------------------------------------------
Содержание 86140B Series
Страница 2: ...Agilent 86140B Series Optical Spectrum Analyzer User s Guide ...
Страница 11: ...1 4 Getting Started Product Overview Agilent 86140B Front and Rear Panels ...
Страница 12: ...1 5 Getting Started Product Overview ...
Страница 14: ...1 7 Getting Started Product Overview Figure 1 2 Display Annotations ...
Страница 28: ...1 21 Getting Started The Softkey Panels ...
Страница 33: ...1 26 Getting Started The Softkey Panels The Systems Menus continued ...
Страница 41: ...1 34 Getting Started Product Options and Accessories ...
Страница 79: ...2 38 Using the Instrument Analyzer Operating Modes ...
Страница 80: ...3 Function Reference ...
Страница 239: ...6 2 Maintenance Changing the Printer Paper Changing the Printer Paper ...
Страница 283: ...7 22 Specifications and Regulatory Information Declaration of Conformity Declaration of Conformity ...