Agilent Technologies 81640A Stud Sensor User Manual


 
Performance Test Instructions Performance Tests
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules Users Guide, Sixth Edition 83
Signal-to-Source Spontaneous Emission Tests - Low
SSE Outputs
Follow this procedure to test modules with Low SSE high power
outputs:
Agilent 81480A, Output 1, Low SSE
Agilent 81680A, Output 1, Low SSE
Agilent 81640A, Output 1, Low SSE
The previous setup is limited by the dynamic range of the Optical
Spectrum Analyzer. An improvement can be done by reducing the
power of the spectral line of the Tunable Laser module by a filter, a
Fiber Bragg Grating. However, by this approach, the measurement is
limited to a single wavelength (that of the peak attenuation of the
Fiber Bragg Grating):
The Fiber Bragg Grating has a straight connector on one end and a
slanted connector on the other. Depending on the output connector
option of your Tunable Laser module, the Device Under Test (DUT),
the Fiber Bragg Grating should be connected with:
a straight connector, if you use option #021 or #071, or
the slanted connector, if you use option #022 or #072.
NOTE Because the Tunable Laser channel displays the wavelength in air and
the Optical Spectrum Analyzer displays the wavelength in a vacuum
there is a mismatch between the values displayed by the two
instruments.
A good approximation in this wavelength range is:
λ
OSA
= λ
TLS
0.5 nm
Use λ
TLS
as primary reference because the specified wavelength
accuracy of the Tunable Laser modules is better than the OSA.
The accuracy of the offset value in this equation does not influence the
measurement accuracy of spectral and total SSE measurements.