A Device for Generating Octave-Frequency Millimeter Waves Using a Mach-Zehnder Modulator

Abstract

The invention discloses a device and method for generating eight frequency multiplication millimeter waves by utilizing a Mach-Zehnder modulator, and the device and method are mainly used for the generation of the optical millimeter waves in a radio over fiber (ROF) access network. The method is shown in attached figures: optical millimeter wave signals, the frequency of which is eight times as large as that of local oscillator signals, are generated by utilizing nonlinear characteristics and interference superposition characteristics of two parallelly-connected double-parallel lithium niobate Mach-Zehnder modulators (DPMZM) and under the condition of an appropriate DC bias voltage, thereby greatly reducing equipment frequency index required for generating high frequency / extremely high frequency signals, and reducing the system cost. According to the device and method, specific phase modulation index is not needed, and radio-frequency signals can be flexibly adjusted, so that the requirement for radio-frequency power is lowered; and meanwhile, stray sideband can be well restrained.

Description

technical field [0001] The present invention relates to the field of optical communication technology and microwave technology, and in particular to a method for generating high-frequency millimeter-wave signals based on a relatively mature external modulation technology in optical communication technology. Background technique [0002] The development of computers and communication networks has brought human society into the information age. In recent years, the rapid growth of Internet business volume and the diversification of business forms have made people not only satisfied with the previous simple communication methods of text, sound, and picture transmission, but also have higher and higher demands for multimedia communication such as video. The more urgent it is, the higher the requirements for network bandwidth and mobility. In this context, the optical fiber communication network with large capacity, high bandwidth, low loss, anti-electromagnetic interference, an...

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Problems solved by technology

[0006] However, the generation of high-frequency millimeter waves in ROF systems is a very critical issue. It is difficult or even almost impossible to generate very complex extremely high-frequency millimeter-wave signals with traditional electrical domain methods, mainly because crystal oscillators are generally used in the electrical domain The device generates high-frequency millimeter-wave signals through frequency multiplication and phase-locking. Due to the speed bottleneck of electronic devices and the limitation of technology, it is difficult to generate high-frequency and high-quality signals.

In addition, using the electrical domain method to generate high-frequency millimeter-wave signals has very high requirements on the device, and the complex manufacturing process may greatly reduce the performance of the device

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