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Signal Generation – The SOURce Subsystem Measurement Operations & Settings
Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition 117
command:
[:SOURce[n]][:CHANnel[m]]:AM:STATe[l]
syntax: [:SOURce[n]][:CHANnel[m]]:AM:STATe[l]<wsp> OFF|ON|0|1
description: Enables and disables amplitude modulation of the laser output.
parameters: A boolean value: OFF or 0: amplitude modulation disabled (default)
ON or 1: amplitude modulation enabled.
NOTE
Use [l] to enable/disable amplitude modulation for the upper or lower wavelength laser
source of a dual-wavelength laser source or a return loss module with an internal dual-wave-
length laser source. The default value of [l] is 1, the lower wavelength source. The upper
wavelength source is denoted by 2.
NOTE
When the internal modulation is selected, the Modulation Output on the front panel outputs
a version of the modulating signal that has the same frequency and phase as the modulating
signal, but has a fixed, TTL-level amplitude. You can use this to synchronize your external
measuring equipment to your instrument.
To allow for your possible synchronization requirements, there are two ways in which the
signal can be output. Either the signal is combined with the laser-ready signal, so that the
output is kept low when there is no optical signal being output (for example, while the laser
is settling after a change of wavelength). Or the modulation signal is output all the time. This
is set by the :SOURCE:MODOUT command (see “[:SOURce[n]][:CHANnel[m]]:MODout” on
page 121).
NOTE
When you enable lambda logging, see
“[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging” on page 140, and modulation
simultaneously, a sweep cannot be started, see
“[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:[STATe]” on page 145.
response: none
example: sour2:am:stat 0
affects: All laser sources, DFB sources, tunable laser modules, and return loss modules containing
an internal source.
command:
[:SOURce[n]][:CHANnel[m]]:AM:STATe[l]?
syntax: [:SOURce[n]][:CHANnel[m]]:AM:STATe[l]?
description: Returns the current state of amplitude modulation.
NOTE
Use [l] to query the current state of modulation of the upper or lower wavelength laser
source of a dual-wavelength laser source or a return loss module with an internal dual-wave-
length laser source. The default value of [l] is 1, the lower wavelength source. The upper
wavelength source is denoted by 2.
parameters: none
response: A boolean value: 0: modulation is disabled
1: modulation is enabled
example: sour2:am:stat? → 0<END>
affects: All laser sources, DFB sources, tunable laser modules, and return loss modules containing
an internal source.