Optical generation method and devices of tunable high-frequency microwave signals

A microwave signal and high frequency tuning technology, applied in the field of microwave photonics, can solve the problems of difficulty in obtaining microwave signals, irrelevance and complexity, and achieve the effects of simple structure, easy generation and easy realization of the device
CN101540469AInactive Publication Date: 2009-09-23ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2009-09-23
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention relates to an optical generation method and devices of tunable high-frequency microwave signals. The method utilizes radial stress to cause a narrowband transmission peak of a phaseshift Fiber Bragg Grating to be divided into two so as to realize a dual-wavelength laser and further generate the tunable high-frequency microwave signals by beat frequency. The devices for realizing the method comprise a pump light source with the wavelength of 980nm, a three-port 980nm / 1550nm optical wavelength-division multiplexer, a uniform Fiber Bragg Grating, a phaseshift Fiber Bragg Grating, a three-port optical circulator and an erbium-doped gain optical fiber as well as a photodetector, wherein the uniform Fiber Bragg Grating, the phaseshift Fiber Bragg Grating, the three-port optical circulator and the erbium-doped gain optical fiber form a laser resonator. All the gratings utilized by the method have the common grating structure, and compared with the generation method of electric microwave signals, the devices have simple structures and easy realization and are easy for generating the tunable microwave signals.
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Description

technical field

[0001] The invention belongs to the technical field of microwave photonics, relates to the generation technology of high-frequency microwave signals, is especially suitable for the application in the optical fiber wireless system (RoF system) combining wireless communication and wired communication, and specifically relates to an optical method A method for generating a tunable high-frequency microwave signal, and an apparatus for realizing the method. Background technique

[0002] In optical fiber wireless systems, digital signals are usually modulated on high-frequency carrier signals, and then transmitted in optical fibers through optical modulation, thereby increasing system bandwidth and communication rate. Optical fiber wireless system provides a good solution for next-band wireless communication. In this system, the high-frequency carrier signal is very critical to the improvement of system bandwidth and communication rate. At present, the methods fo...

Claims

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