Terahertz signal generation method and device

Abstract

The invention discloses a terahertz signal generation method and device, belonging to the technical field of optical communication. The generation device comprises an optical frequency comb generator, wherein the output end of the optical frequency comb generator is connected with a first optical filter; an upper channel of the first optical filter is connected with the photoelectric modulator, and a lower channel of the first optical filter is connected with a frequency shifter; the output end of a photoelectric modulator and the output end of the frequency shifter are separately connected with a second optical filter; and a lower channel of the second optical filter is connected with the frequency shifter through a closed-loop feedback compensation device. The terahertz signal generation method and device are based on a single heterodyne closed loop feedback phase stabilization technology. According to the technology, a receiving end does not need to carry out phase compensation on received terahertz waves by using a DSP algorithm, and error-code-free receiving can be realized; and in addition, a voltage-controlled oscillator and the frequency shifter are used for optical signal phase compensation, and the advantages of being high in response speed and large in phase compensation range are achieved.

Description

technical field [0001] The invention relates to the field of optical communication, in particular to a method and device for generating terahertz signals for high-frequency, large-bandwidth optical-carried wireless links. Background technique [0002] With the vigorous development of wireless communication, low-frequency high-quality spectrum resources are showing a tendency to be exhausted. Current technologies for improving spectrum utilization, such as orthogonal frequency division multiplexing technology and high-order modulation technology, are also difficult to meet the rapid increase in communication data traffic. An effective means to solve the exhaustion of spectrum resources is to adopt 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 photonics in high frequency and large bandwidth, photonics-based terahertz wave generation...

AI Technical Summary

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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