A method and device for generating a terahertz signal

Abstract

The invention discloses a method and a device for generating a terahertz signal, belonging to the technical field of optical communication, wherein the generating device comprises an optical frequency comb generator, and an output end of the optical frequency comb generator is connected to a first optical filter; The upper channel of the first optical filter is connected to the photoelectric modulator, and the lower channel of the first optical filter is connected to the frequency shifter; the output end of the photoelectric modulator and the output end of the frequency shifter are respectively connected with the first Two optical filters are connected; the lower channel of the second optical filter is connected with the frequency shifter through a closed-loop feedback compensation device. The method and device for generating a terahertz signal are based on a single heterodyne closed-loop feedback phase stabilization technology; the technology enables the receiving end to achieve error-free reception without using a DSP algorithm to perform phase compensation on the received terahertz wave; in addition, using The voltage-controlled oscillator and frequency shifter perform optical signal phase compensation, which has the advantages of fast response speed and large phase compensation range.

Description

technical field [0001] The present invention relates to the field of optical communication, in particular to a method and a device for generating a terahertz signal for a high-frequency and large-bandwidth optical carrier wireless link. Background technique [0002] With the vigorous development of wireless communication, the low-frequency high-quality spectrum resources show a tendency to be exhausted. Current technologies for improving spectrum utilization, such as orthogonal frequency division multiplexing and high-order modulation, are also difficult to meet the rapid increase in communication data traffic. An effective way to solve the depletion of spectrum resources is to use terahertz technology, because the frequency of terahertz can be as high as 10THz, which provides almost endless spectrum resources for wireless communication. Due to the natural advantages of high frequency and large bandwidth of photonics, photonics-based terahertz wave generation schemes have a...

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Problems solved by technology

However, this method has phase noise caused by laser frequency offset and linewidth, which can cause serious bit errors

The phase noise caused by laser frequency deviation and line width can be compensated by digital signal processing (DSP) algorithm, but DSP algorithm will bring large power consumption and delay, increase the cost of the receiving end, and affect the real-time transmission of information

The phase noise caused by laser frequency deviation and line width can also be eliminated by using an optical frequency comb, but the phase noise caused by physical optical path separation is often introduced during the modulation of the optical frequency comb by the input data signal

In the terahertz wave link based on the optical frequency comb to generate the data signal, it is necessary to eliminate the phase noise caused by the separation of the physical optical path and improve the stability of the terahertz wave phase; but so far, there is still a lack of simple structure, Apply feasible solutions

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