Device and method for generating terahertz wave based on nested Mach-Zehnder modulator
A modulator and nested technology, applied in the field of terahertz wireless communication, can solve the problems of many optical devices, complex implementation, large insertion loss, etc., to simplify the device structure, reduce bandwidth requirements, strong operability and tunability. Effect
Inactive Publication Date: 2013-01-02
HUNAN UNIV OF TECH
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The invention discloses a device and a method for generating a terahertz wave based on a nested Mach-Zehnder modulator in the field of terahertz wireless communication. The device comprises a tunable light source, a radio frequency signal source, an electric branching unit, a first electric amplifier, an electric phase shifter, a second electric amplifier, the nested Mach-Zehnder modulator and a photoelectric detector. The method comprises the following steps that: a low-frequency sine wave signal output by the radio frequency signal source is divided into two paths by the electric branching unit; the two paths of signals are amplified by a first amplifier and a second amplifier and then respectively drive an upper arm sub-modulator and a lower arm sub-modulator of the nested Mach-Zehnder modulator; continuous light waves output by the tunable light source are input into the nested Mach-Zehnder modulator to modulate; the tuned continuous light waves are input into the photoelectric detector to carry out photoelectric conversion, and the output end of the photoelectric detector generates the terahertz wave which is 12fold as much as the frequency of the low-frequency sine wave signal by rationally adjusting modulation voltage and offset voltage of the nested Mach-Zehnder modulator. The device is simple in configuration, and the system cost and the requirements on the apparatus bandwidth are reduced.
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