Design of ultrahigh-speed square wave pulser in a Brillouin sensing system

Because of the actual situation of the lack of ultrahigh-speed pulser for Brillouin sensor technique, the design method of an ultrahigh-speed pulser was introduced based on field-programmable gate array (FPGA) device. In order to achieve smaller inter-symbol interference and better signal integrity, the crosstalk, modeling and electro-magnetic field of sensitive signal were analyzed. The time-domain waveforms and eye diagrams of the pulse with different pulse width were measured with a broadband oscilloscope. The generated pulse was specified by the minimum pulse width of 1ns, the maximum swing of 1.0V and the rising and falling transition time of less than 300ps. The pulse width could range from 1ns to 5ns, while repetitive frequency could range from 1kHz to 10kHz. This result is helpful for improving the design of ultrahigh-speed pulsers.