Tunable Lasers How to Modulate a Signal
122 Agilent 8163A Lightwave Multimeter, Agilent 8164A Lightwave Measurement
System, & Agilent 8166A Lightwave Multichannel System, 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 80. 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 81680A,
Agilent 81682A, and Agilent 81640A - 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 79 External Analog Modulation and Output Power
5 V
pp
Analog
Input
Output
Power
±15%
t
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