Method for all-optically generating sextuple frequency high-speed millimeter wave

Abstract

The invention relates to a method for all-optically generating a sextuple frequency high-speed millimeter wave and belongs to the technical field of optical communication. The method comprises the following steps: mutually cascading two standard Mach-Zehnder modulators; respectively driving the two standard Mach-Zehnder modulators by low-speed radio frequency signals; respectively choosing offset points of the two standard Mach-Zehnder modulators as the highest point and the lowest point of a transmission curve; and simply controlling amplitudes and phases of radio frequency driving signals of the two standard Mach-Zehnder modulators, thereby acquiring the high-speed millimeter wave, the repeated frequency of which is sextuple frequency of the radio frequency signals. According to the method provided by the invention, a linear optical frequency multiplying process is used for generating the millimeter wave which has excellent spectrum purity and phase coherence. Expensive high-speed photoelectric element and complex nonlinear signal processing process are unnecessary according to the method, thereby greatly lowering the configuration cost and simplifying the system structure. If a high-speed element is adopted while the system structure is unchanged, the frequency band can be easily increased to above 100GHz. The method has wide application prospect in future wireless wideband communication.

Description

technical field [0001] The present invention relates to a method and device in the technical field of optical communication, specifically, a method for all-optical generation of six-fold frequency high-speed millimeter wave in an optical wireless communication system. Background technique [0002] Wireless communication over optical fiber is an emerging technology. It mainly combines the two major technologies of optical fiber and wireless communication, and uses the characteristics of low loss and high bandwidth of optical fiber to improve the bandwidth and mobility of wireless access network, and provide users with "anytime, anywhere , any business” wireless access service. Compared with traditional wireless systems, wireless communication over optical has the advantages of wider cellular coverage, higher bandwidth, lower configuration costs, lower power consumption, and easy dynamic management and maintenance, etc., and can achieve more than 1Gbit / s Ultra-broadband wirel...

AI Technical Summary

Problems solved by technology

However, this solution has the following disadvantages: 1. A 400-meter-long highly nonlinear optical fiber and a high-power optical amplifier are required to generate the four-wave mixing effect, which increases the configuration cost of the system; 2. The use of multiple discrete optical devices makes The structure of the system is complex, the insertion loss is large, and it is difficult to realize integration; 3. Four-wave mixing based on highly nonlinear optical fibers will cause stimulated Bryouin scattering and affect the efficiency of four-wave mixing; 4. Fiber Bragg gratings are required Filter out other unwanted frequency components, because the fiber Bragg grating is very sensitive to temperature and light wavelength, it will cause the generated millimeter wave to lack good stability