BNC 130 - Manual (Page 10)

10
SECTION 2
OPERATING INFORMATION
FEATURES
The Model 106C, 155 and 130 plug-in modules provide 1064nm, 1550 nm and 1310 nm optical output
sources for the Model 6040 Universal Pulse Generator. Accurate and adjustable outputs are available for
all of the four modes in which the 6040 mainframe can operate.
In Pulse Mode operation, the 106C/155/130 supplies flat-topped pulses with fast rise and fall times and
independently adjustable Peak and Baseline levels. The timing for these pulses may be supplied in a
number of ways.
A delayed pulse of adjustable width may be generated by the mainframe. This delay can be specified
with respect to an internal trigger occurring at a selected repetition rate or with respect to an externally
supplied trigger signal (TRIG IN). In addition, Single Cycle operation allows the user to trigger the
instrument manually, using a pushbutton (or using remote programming). In each case a trigger out
signal (TRIG OUT) is provided by the 6040 for reference (see Figure 1-1). Double Pulse operation,
producing both an initial and delayed pulse put of the same jack may be selected for any trigger choice.
For all of these timing options, the mainframe supplies electrical output pulses (PULSE OUT) coincident
with the module's optical output (LIGHT OUT).
External Drive operation is also available in the Pulse Mode. This allows a drive signal, supplied by the
user to the module's front panel (EXT DR), to generate the optical pulses directly. The occurrence and
duration of each light pulse will correspond to that of each pulse in the external drive signal: when the
EXT DR pulse goes high, the light pulse goes to the Peak value. Peak and Baseline output levels remain
specified by the mainframe (as well as the threshold level for the external drive signal). With External
Drive, the mainframe's pulse and trigger outputs are disabled.
In External Modulation Mode, an electrical signal supplied to the module's front panel (EXT MOD) by the
user will be converted into its optical analog. The quiescent optical level, corresponding to the zero point
that the input signal modulates about, is selected by the mainframe (External Modulation Level), but no
other parameters can be altered.
In the Impulse Mode, a narrow optical pulse of fixed width and amplitude is produced at the module
output (LIGHT OUT) with a corresponding pulse (of 5 ns duration) appearing at the mainframe (PULSE
OUT). As with the Pulse Mode, the trigger source may be internal, external or from manual (or remote
programming) control. Either a single delayed impulse or a pair of impulses separated by a delay may be
obtained. In Impulse Mode, External Drive operation is disabled; and Peak and Baseline Level settings
also have no effect.
CW Mode results in a steady-state optical output. The output power level in this Mode may
be adjusted by the mainframe (CW Level).
For more detailed information on the characteristics of each Mode and hour to control the module from
the mainframe, see the Specifications section and the 6040 manual.