ConOptics EO Modulator Driver Model # M25D-M SN # 2478
Line Volt 230V 230/240 VAC 50/60 Hz The Model 25D drive electronics is a high voltage push-pull power amplifier capable of output voltage swings in the order of 175v P-P, push-pull. The Model 25D provides output rep rates from DC-30MHz and typical rise and fall times of 8ns. Controls and Indicators: Drive Voltage control allows the end-user to set the P-P output of the amplifier to the proper level for the modulator and the wavelength of operation. Limits are 175v max and 138v min. This is typically set by the user while monitoring the detected output of the system with an oscilloscope. Bias Voltage Adjustment control allows the end user to set the static DC bias on the modulator which sets the quiescent optical operating point. For example, when the system is being used as a high-speed shutter, the user might set the throughput intensity of the system to minimum at logic low input level. Then, when the input signal goes to logic high, maximum throughput intensity is obtained. The inverse may be obtained by setting the Bias at maximum transmission with logic low input. Then when the input goes high, minimum transmission is obtained. Bias Voltage Meter is an analog volt meter that indicates the actual differential bias voltage applied to the modulator. This voltage is not referenced to ground but is to the internal electrodes of the modulator. Bias voltage range is approximately, +/- 400vDC.