HP 8163A Programming Manual page 97

command: [:SOURce[n]][:CHANnel[n]]:AM:SOURce
syntax: [:SOURce[n]][:CHANnel[n]]:AM:SOURce<wsp>
INT|INT1|INT2|EXT|0|1|2
description: Selects the type or source of the modulation of the laser output.
parameters: 0, INT1, or INTernal
1, COHCtrl, or INT2
2, AEXTernal, or EXT
3 or DEXTernal
4 or LFCohctrl
5 or WVLLocking
6 or BACKplane
response: none
example:
sour2:am:sour int
affects: All source modules can use internal digital modulation
All other modulation modes are only available with Tunable Laser modules.
Introduction to Programming
Signal Generation – The SOURce Subsystem
internal digital modulation
coherence control
external analog modulation
external digital modulation
low frequency coherence control
wavelength locking
external digital modulation using Input Trigger
Connector
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