Reconfigurable RoF system based on on-off keying tunable optical filters as well as working method and application of reconfigurable RoF system

Abstract

The invention relates to a reconfigurable RoF system based on on-off keying tunable optical filters as well as a working method and application of the reconfigurable RoF system. The reconfigurable RoF system is characterized by comprising a directly modulated laser, an electrooptical modulator and a tuning unit which are sequentially connected, wherein the electrooptical modulator is connected with a local oscillator source; the tuning unit comprises two on-off keying tunable optical filters which are connected in parallel; the on-off keying tunable optical filters comprise tunable optical filters and MZI optical switches, which are connected in series. The system adopts a direct modulating and external modulating mode to generate and modulate optical millimeter waves; in an up conversion scheme of the optical millimeter waves, the direct modulating and external modulating mode is capable of realizing up conversion with no need of utilizing two MZMs, or up conversion with no need of utilizing non-linearity of optical fibers or semiconductor devices, and is capable of lowering the cost, reducing the complexity and improving the stability while realizing a frequency multiplication effect.

Description

technical field [0001] The invention relates to a reconfigurable RoF system based on an on-off keying tunable optical filter and its working method and application, belonging to the technical field of optical fiber communication. Background technique [0002] With the popularity of smart terminal equipment, the popularization of multimedia services such as high-definition video telephony, and the pursuit of high-quality services such as security monitoring and telemedicine, personal home networks have developed rapidly. Indoor traffic suddenly increased. In addition, the home network with high comfort as the goal requires providing wireless high-speed multimedia access services indoors to meet users' flexible and convenient communication and entertainment needs. In addition to home networks, in other occasions, such as office buildings, industrial parks, airport halls, and large shopping malls, there are also high-volume wireless communication requirements such as video con...

AI Technical Summary

Problems solved by technology

For signal processing in the traditional electrical domain, due to electronic bottlenecks such as response frequency in microwave processing based on electronic structures, the cost of high-frequency devices will become very expensive

Therefore, high-frequency millimeter-wave communication has always been a research hotspot. In the up-conversion scheme of optical-carrying millimeter-wave, it includes the use of two Mach-Zehnder modulators to achieve up-conversion, and the use of nonlinearities in optical fibers or semiconductor devices to achieve up-conversion. However, these technologies still face problems such as high cost, complex structure, and insufficient stability, which seriously hinder their commercial application.

[0004] There is no device and method for applying on-off keying tunable optical filters to RoF systems in the prior art

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