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Measurement Operations & Settings Signal Generation – The SOURce Subsystem
118 Agilent 8163A/B, 8164A/B & 8166A/B Mainframes, Fifth Edition
command:
[:SOURce[n]][:CHANnel[m]]:AM:COHCtrl:COHLevel[l]
syntax: [:SOURce[n]][:CHANnel[m]]:AM:COHCtrl:COHLevel[l]<wsp><value>[MIN | MAX | DEF]
description: Sets the level of coherence, when using coherence control, on an arbitrary scale from 1 to
99.98%. A 100% coherence level corresponds to maximum coherence length and minimum
linewidth. The coherence level required for a specific linewidth and coherence length can
vary between modules.
parameters: The excursion level as a percentage of its maximum value.
Also allowed: MIN: minimum programmable value (0%)
MAX: maximum programmable value (100%)
DEF: default preset (*RST) value.
response: none
example: source2:am:cohc 50
affects: DFB sources and Agilent 81980A, 81940A, 81989A, 81949A
command:
[:SOURce[n]][:CHANnel[m]]:AM:COHCtrl:COHLevel[l]?
syntax: [:SOURce[n]][:CHANnel[m]]:AM:COHCtrl:COHLevel[l]<wsp><value>?[MIN | MAX | DEF]
description: Queries the current level of coherence, when using Coherence Control. Coherence is ex-
pressed on an arbitrary scale from 1 to 99.98%. A 100% coherence level corresponds to
maximum coherence length and minimum linewidth.
parameters: Optional MIN: returns the minimum programmable value (0%)
MAX: returns the maximum programmable value (100%)
DEF: returns the default preset (*RST) value.
response: Returns the currently set excursion level as a percentage between 0 and 99.98
example: source2:am:cohc? → 50<END>
affects: DFB sources and Agilent 81980A, 81940A, 81989A, 81949A
command:
[:SOURce[n]][:CHANnel[m]]:FM:SOURce[l]
syntax: [:SOURce[n]][:CHANnel[m]]:FM:SOURce[l]<wsp>SBSCtrl|0
description: Selects the type of the frequency modulation of the laser output.
Currently, only parameter strings that select SBS Control are valid.
Enable frequency modulation before issuing this command.
Refer to “[:SOURce[n]][:CHANnel[m]]:FM:STATe[l]” on page 119.
parameters: 0, SBSCtrl Simulated Brillouin Scattering
NOTE
SBSCtrl (Simulated Brillouin Scattering) Control modulation suppresses SBS effects within
high-power measurement setups.
response: none
example: sour2:fm:sour SBSC
affects: Agilent 81980A, 81940A, 81989A, 81949A compact tunable lasers.