Santec TSL-770 - External Modulation; Low-Frequency Modulation

6-4
TSL-770 Operation Manual
This product is equipped with a function for modulating the intensity of optical power
using external signal. The modulations are classied as either low-frequency (LF)
modulation or highfrequency (RF) modulation according to the frequency band. RF
modulation is an option.
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6-3-1 Low-frequency Modulation
Modulating the intensity of optical power is performed at relatively low frequency.
Specications
Input voltage : -1.65 to 0 V
Modulation depth : 100 % (Max.)
Bandwidth : 0 to 400 kHz (Typ.)
Input impedance: 4.7kΩ
Input terminal: ANALOG INPUT
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How to set
1. Touch MENU and MOD to move to modulation setting screen.
2. Select “LF” in Source pull-down menu, and turn State ON.
3. “LF Mod” lights up on the right edge of the screen.
4. Input modulation signal into the BNC connector labeled “ANALOG INPUT” at
the rear panel.
6-3 External Modulation
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How to cancel
1. Turn State OFF.
2. Coherence control function turns OFF, and “Coh.Ctrl” turns off on the screen.