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Performance Test Instructions Performance Tests
Agilent 81480A and 81680A, 40A, 82A, 42A, & 89A Tunable Laser Modules User’s Guide, Sixth Edition 89
Signal to Total SSE Tests - Low SSE Outputs
Follow this procedure to test modules with low SSE outputs:
• Agilent 81480A, Output 1, the Low SSE output
• Agilent 81680A, Output 1, the Low SSE output
• Agilent 81640A, Output 1, the Low SSE output
1 Check center wavelength of Fiber Bragg Grating, FBG (λ_FBG)
which is printed on its label (for example, 1520.5 nm). This value
relates to vacuum conditions.
2 Determine OSA noise, that is, the noise of OSA alone without
applying the Tunable Laser signal:
a Switch off the laser output of the Tunable Laser.
b Set the OSA
• Set the Span to 30 nm. Press Span and enter the value.
• Set the center wavelength, OSA_λ_center, to λ
FBG
− 0.5 nm. Press
Center and enter the value.
• Set the reference level to −40 dBm. Press [AMPL], press [Ref
LVL], and enter the value.
• Set the Sensitivity to −90 dBm. Press [AMPL], press
[SENS AUTO MAN
], and enter the value.
• Set the resolution bandwidth to 1 nm. Press [BW Swp], and enter
the value.
Signal to Total SSE Measurement
Wavelength/ nm
Output
Power
Measured S
p
ectrum
Signal
Total SSE =
Σ