Tunable Lasers How to Modulate a Signal
136 Agilent 8163A/B, 8164A/B, and 8166A/B User’s Guide, Fourth Edition
To enable external analog modulation:
1 Move to the Tunable Laser channel and press [Details].
2 Move to [Mod Src] and press Enter.
3 Move to <External Analog>, by using the cursor key, and press
Enter. The text ExtA appears in the Tunable Laser channel.
Wavelength Locking
You can choose wavelength locking as the modulation source, so the
the change in output wavelength is roughly proportional to the voltage
you apply to the input BNC connector on the front panel of your
Tunable Laser module as shown in Figure 78. This enables you to fine
tune the output wavelength within a limited wavelength range.
Wavelength locking may exhibit some hysteresis effects. The
wavelength change may differ slightly when you increase voltage from
when you decrease voltage.
If you modulate the input signal, the amplitude of the wavelength
change of the modulated optical output reduces with increasing
modulation frequency. See Appendix C of the Tunable Laser Modules
User’s Guide for more details.
CAUTION There are two BNC connectors on the front panel of the
Agilent 81480B, Agilent 81482B, Agilent 81672B, Agilent 81680B,
Agilent 81682B, Agilent 81640B and Agilent 81642B - a BNC input
connector and a BNC output connector.
An absolute maximum of ± 6 V can be applied as an external voltage to
any BNC connector.
Figure 77 External Analog Modulation and Output Power
5 V
pp
Analog
Input
Output
Power
±15%
t
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