Agilent Technologies 86038B User Manual page 113

Agilent 86038B Photonic Dispersion and Loss Analyzer, Second Edition
TLS Output
This setting can be used to change the TLS Output used from the
standard "high power" Output 2 to the Low-SSE Output 1. The
latter can be used to measure higher out-of-band rejection
(isolation) for some wavelength-filter devices. Note however that
Output 1 provides less laser power and may thus reduce the
available power dynamic range of the measurement. The PDA
correction, which can be chosen during Normalization, is not
available when using Output 1.
Settle TLS Now
Initiates the TLS Settling, "Lambda Zero", process on the
tunable laser source. The laser monitors temperature change,
and automatically performs a recalibration of the wavelength if
required to maintain specified operation. The PDLA status
message, Estimated Time Until Next TLS Settling, indicates the
estimated time before such a process is required. Under normal
temperature conditions, the status message shows up to 120
minutes as the estimate. This status message is updated every
minute.
A TLS Settling can be initiated in two ways by the PDLA:
• TLS Settling can be initiated by the user at anytime, with the
Settle TLS Now control. This may be convenient before a long
measurement process to avoid interruption.
• When the estimated time indicator turns from a yellow to red
background, a TLS settling will automatically be started
within approximately 4 minutes. In Swept mode, the current
measurement will finish before the TLS Settling is initiated.
In Stepped mode, the measurement will pause after the
current step is measured and restart with the next step once
the TLS Settling is complete. We recommend that once the
icon turns from green to yellow, that you start a TLS Settling
immediately, before beginning a new measurement.
Tip: A TLS Setting Status indicator is also displayed as a
Lambda symbol at the bottom right of the display. The color of
the Lambda symbol changes in the same way as described
above. A TLS Settling can be initiated by right-clicking the icon
and selecting Settle TLS Now.
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