Anritsu MS9740B - Automatic Alignment of Optical System

Chapter 3 Measurement
3-4
3.1.1 Automatic Alignment of Optical System
Adjust the optical system to satisfy the specifications for wavelength
accuracy, level accuracy, and dynamic range, using the following
procedures. The automatic alignment of optical system should be
performed before performing other calibration functions.
For this alignment, the external light source that meets the specification
is required. Also, if MS9740B-002 Light Source for Wavelength
Calibration is installed, the function of Automatic Alignment of Optical
System is added. To align the optical axis automatically using this
function, refer to 3.1.2 “Calibrating Wavelength”.
To calibrate using external light source:
1. Input the following optical specifications in the MS9740B.
Level –20 dBm or more
Wavelength 600 to 1700 nm
Spectrum single mode
2. Press
F8
to display Cal on the horizontal function keys.
3. Press
F2 Cal
.
4. Press
f6 Auto Align
.
5. Press
f1 Execute
. The “Calibrating” message is displayed. Press
f2
Cancel
to cancel adjustment and return to the status before
executing adjustment.
6. Adjustment of the optical axis is finished when the
Calibrating…message disappears from the screen.
Note:
Use a single mode oscillation light source such as a DFB laser diode
or gas laser.
In addition, always use a light source that meets the specifications.
If the light source spectrum is not single mode or the level is too low,
calibration may not be performed correctly when performing
auto-alignment of the optical system.
Cancel processing takes about 10 s.
To initialize Adjustment Data
Initialize the automatic optical axis adjustment data using the following
procedures.
1. Press
F8
to display Cal on the horizontal function keys.
2. Press
F2 Cal
.
3. Press
f6 Auto Align
.
4. Press
f3 Init
to initialize the optical axis adjustment data.