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response:
0:
1:
2:
3:
5:
6:
example:
sour2:am:sour?
affects:
Internal digital modulation is available with fixed-wavelength laser sources (Fabry-Perot, DFB lasers), return loss modules
containing an internal source, and tunable lasers, except 81602A, 81606A, 81607A, 81608A and 81609A.
Coherence control is available with DFB sources and tunable lasers except 81606A and 81607A. External wavelength
locking is available with 81602A, 81606A and 81600B tunable lasers.
Other modulation modes are only available with tunable laser modules except 81602A, 81606A, 81607A, 81608A and
81609A.
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:
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-wavelength laser source. The default value of [l] is 1, the lower
wavelength source. The upper wavelength source is denoted by 2.
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
When you enable lambda logging, see
page 170, and modulation simultaneously, a sweep cannot be started, see
[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:[STATe]
response:
none
example:
sour2:am:stat 0
affects:
All laser sources, DFB sources, tunable laser modules except 81950A, and return loss modules containing an internal
source.
8163A/B, 8164A/B & 8166A/B Mainframes Programming Guide
internal digital modulation
coherence control
external analog modulation
external digital modulation
wavelength locking
external digital modulation using Input Trigger Connector
->
+0<END>
OFF or 0: amplitude modulation disabled (default)
ON or 1: amplitude modulation enabled.
[:SOURce[n]][:CHANnel[m]]:MODout
[:SOURce[n]][:CHANnel[m]]:WAVelength:SWEep:LLOGging
Measurement Operations & Settings
on page 139).
on page 176.
4
on
127
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