158 8163A/B, 8164A/B, 8166A/B User’s Guide
5 Tunable Lasers
Figure 91 External Analog Modulation and Output Powr
To enable external analog modulation:
1 Move to the Tunable Laser channel and press [Details].
2Move to [Mod Src] and press Enter.
3Move 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 92 on page -159. 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.
5 V
pp
Analog
Input
Output
Power
±15%
t
There are two BNC connectors on the front panel of the 814xxB, 816xxB
and 8160xA tunable laser modules, 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.
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