Agilent Technologies 8614 B Series User Manual page 54

Using the Instrument
Calibrating Wavelength Measurements
Internal Wavelength Calibration
The optional internal calibrator (1513 to 1540 nm) provides a convenient method for increasing
wavelength accuracy when used with an internal Enhanced Wavelength Calibration (EWC) pro-
cess. The wavelength accuracy of the OSA will be ±0.2 nm over the full wavelength range of the
instrument, with ±10 pm over 1480 to 1570 nm and ±25 pm accuracy over 1570 to 1620 nm.
The EWC range can be selected for either the "full" OSA range of 605 nm to 1670 nm, or the
"telecom" range of 1270 to 1670 nm, a smaller span more relevant to telecommunications. EWC
must be enabled for the wavelength accuracy specifications to apply in the range selected. Set-
ting the range to FULL will require a longer calibration time for an internal calibration, but will
provide enhanced wavelength accuracy over the full range.
Manual method using the internal calibrator
1 Access the EWC setup panel:
System > More System Functions > Service Menu > Adv Service Functions > More Adv
Service Menu > Enhanced Wvl Cal Setup
2 Enable the function, if necessary, and select the desired calibration range.
3 Clean all connectors and connect the internal calibrator to the OSA input.
4 Access the Wavelength Calibration setup panel:
System >Calibration > Wavelength Cal Setup
5 Set the signal source to Calibrator.
6 Press Perform Calibration.
Remote method using the internal calibrator
CALibration:WAVelength:EWC:FUNCtion ON
CALibration:WAVelength:EWC:RANGe TELE
CALibration:WAVelength:INTernal:NORMal
2-14
!Enable enhanced wavelength calibration.
!Select telecom (1270-1670) nm range for
enhanced wavelength calibration.
!Perform internal wavelength calibration.
!The internal calibrator must be connected
before sending this command.