Model 428 User’s Manual OPERATION
Bristol Instruments, Inc. 20
Def Ref # – Identifies the reference channel for the Delta calculation. The
options for the Def Ref # are channels 1-999. Use the Select button to
highlight the Def Ref # value’s left most digit, use the Change or Arrow
buttons to set the desired number, and use the Select button to highlight the
next digit to the right. Repeat to set the second digit.
Configuration Screen 3
Displays and allows changes to the parameters that specify how the Optical
Signal-to-Noise Ratio (OSNR) is computed.
Figure 3.13: Configuration Screen 3
SNRAuto – The OSNR is calculated as the ratio of the power in the optical
channel, either relative to the interpolated noise at the channel location (On),
or relative to a user selected noise location (Off). The noise at the channel
location is interpolated by calculating the average of the noise floor, measured
100 GHz to the left and to the right of the peak location. If another channel is
less than 200 GHz from the peak of interest, then the noise is calculated at
the midpoint between the two channels.
Use the Select button to highlight the SNRAuto value, and use the Change or
Arrow buttons to change the SNRAuto status on or off.
SNRUser – Identifies the wavelength, in nanometers, where the noise is
measured for use in the OSNR calculation if SNRAuto is off. Use the Select
button to highlight the SNRUser value’s left most digit, use the Change or
Arrow buttons to set the desired number, and use the Select button to
highlight the next digit to the right. Repeat until all four digits are set.
SNRBW – Identifies the noise bandwidth used in the ONSR calculation if
SNRAuto is off. When SNRAuto is on, the noise bandwidth is 0.10 nm. Use
the Select button to highlight the SNRBW value’s left most digit, use the
Change or Arrow buttons to set the desired number, and use the Select
button to highlight the next digit to the right. Repeat until all four digits are
set.
To Next Page
Loading...
