134 8163A/B, 8164A/B, 8166A/B User’s Guide
5 Tunable Lasers
What is a Tunable Laser?
A tunable laser is a laser source for which the wavelength can be varied
through a specified range. The Keysight Technologies Tunable Laser
modules also allow you to set the output power, and to choose between
continuous wave or modulated power.
How to Set the Power
The laser output can be either:
• a continuous wave (CW) signal, fixed amplitude signal, see How to Set
the Output Power of a CW Signal on page 134,
• a modulated signal, see How to Modulate a Signal on page 155, or
• a signal with increased linewidth (coherence control), see How to
Increase Linewidth on page 161.
If [Mod Src] is <Off>, a continuous wave signal is the chosen optical
output. A continuous wave signal is the default.
If any other [Mod Src] source is chosen, the chosen source modulates the
signal. For possible modulation sources, see How to Modulate a Signal on
page 155.
Attenuator
If your tunable laser has an built-in optical attenuator, you can choose one
of the two following power modes:
•
<Automatic> Attenuation Mode, you
specify the output power and the instrument automatically sets the optical output power by using the
optimum combination of laser diode current and optical attenuation, or
• <Manual Att.> Mode, you specify the output power and the attenuation.
The two modes are separate, the values set in one mode do not affect
values set in the other.
How to Set the Output Power of a CW Signal
How to Set Output Power
To set the output power to 555.000
μW:
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