Agilent Technologies 81662A, User Manual, Page: 39 / 72

Performance Tests Performance Test Instructions
38
Agilent 81662A and 81663A DFB Laser Source Modules User’s Guide, Fifth Edition
6
Wait until the wavelength meter has settled. Then measure the
wavelength and note the result in the test record as the reference
wavelength, "REF".
7 Set the frequency offset of the DFB Source module to any value in
its range (in the test record, this is given in column "from
wavelength").
8 Set the frequency offset of the DFB Source back to the reference
frequency and wait until the Wavelength Meter has settled.
9 Repeat steps 5 to 8 for all frequency offsets given in the test record.
10
From all the wavelength measurements, pick the largest measured
value and the smallest measured value.
11 Calculate the wavelength repeatability by subtracting the largest
measured value from the smallest measured value.
Example for 81662A #315
Repeatability of
Df = -50 GHz (= reference)
Measurement Results [nm] Specification
Initial Setting REF = 1531.901
from -30 GHz to -50 GHz 1531.902
from -10 GHz to -50 GHz 1531.902
from 0 GHz to -50 GHz 1531.900
from +10 GHz to -50 GHz 1531.898
from +30 GHz to -50 GHz 1531.899
from +50 GHz to -50 GHz 1531.900
Largest measured value 1531.902
Smallest measured Value 1531.898
Wavelength Repeatability 0.004 <0.06