Agilent Technologies B, 8163A, 8164A, 8166A - page 118

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 cont rol, 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 mod ules.
parameters: The excursion level as a percentage of its maxi mum 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 Agilent81980A, 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 corresp onds to
maximum coherence le ngth and minimum lin ewidth.
parameters: Optional MIN: returns the minimum programmab le value (0%)
MAX: returns the maximum programma ble 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 Agilent81980A, 81940A, 8 1989A, 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 modulat ion of the laser output.
Currently, only parameter strings that select SBS Con trol are valid.
Enable frequency modulation be fore issuing this command.
Refer to “[:SOURce[n]][:CHANnel[m]]:FM:STATe[l]” on page119.
parameters: 0, SBSCtrl Simulated Brillouin Scatterin g
NOTE SBSCtrl (Simulated Brillouin Scatt ering) Control modulation sup presses SBS effects within
high-power measurement setups.
response: none
example: sour2:fm:sour SBSC
affects: Agilent81980A, 81940A, 81989A, 81949A compact tunable lasers.