Terahertz wave signal generation system and method based on optical frequency comb

Abstract

The embodiment of the invention provides a terahertz wave signal generation system and method based on an optical frequency comb. The system comprises a laser and a radio frequency source. A first modulator is used for modulating the laser and the radio frequency signal to generate an initial optical frequency comb; a second modulator is used for modulating the radio frequency signal and the initial optical frequency comb to generate a target optical frequency comb; a wavelength selection switch is used for selecting two frequency comb lines of which the frequency interval is a preset intervalfrom the target optical frequency comb, and sending a first frequency comb line to an optical coupler; a Mach-Zehnder modulator is used for loading data in the digital signal into the second frequency comb line to obtain an initial optical carrier signal; the optical coupler is used for combining the first frequency comb line and the filtered optical carrier signal into a target optical carrier signal; and a photoelectric converter is used for performing photoelectric conversion on the target optical carrier signal to obtain a terahertz wave signal. According to the embodiment of the invention, the terahertz wave signal with relatively stable frequency can be generated.

Description

technical field [0001] The present invention relates to the technical field of optical communication, in particular to a terahertz wave signal generation system and method based on an optical frequency comb. Background technique [0002] Terahertz waves refer to electromagnetic waves with a frequency in the range of 0.3 to 10 THz. Compared with optical links, terahertz waves have smaller attenuation of atmospheric disturbances; compared with microwaves, terahertz waves have a larger available bandwidth. In addition, due to the high-speed data transmission capability of terahertz waves and the strong ability of communication tracking and capture, terahertz waves have very good application prospects. [0003] In the prior art, a terahertz wave signal generation system usually includes: two lasers, a power amplifier, and a photoelectric converter. In the process of generating terahertz wave signals, two lasers respectively generate a laser, one of which is input to an IQ (In-p...

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Problems solved by technology

[0004] Since in the prior art, the terahertz wave signal is generated based on the laser light generated by two lasers respectively, and the frequencies of the two lasers are independent, the center frequency of the two generated laser light may be different, therefore, the generated terahertz wave signal The frequency separation of the two signals may vary depending on the precision of the laser, resulting in an unstable frequency of the generated terahertz wave signal

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