Tunable pulse position modulation signal generation device based on spectrum construction

Abstract

The invention discloses a tunable pulse position modulation signal generation device based on spectrum construction, and the device employs a method which comprises the steps: inputting a wide-spectrum optical frequency signal which is emitted from a mode-locked laser and is processed through a polarization controller and a baseband signal into a light polarization modulator for baseband signal modulation at the same time; mapping the baseband signal into different polarization states of the wide-spectrum optical frequency signal; enabling the signal processed by a polarization controller to enter a polarization maintaining FBG through an optical circulator; enabling the polarization maintaining FBG to construct a wavelength modulation spectrum after the polarization state filtering of thesignal; enabling the signal which is finally reflected to reach a dispersion element and a photoelectric detector for the waveform mapping from the frequency domain to the time domain through the optical circulator, and generating a pulse position modulation signal. The device achieves the generation of the pulse position modulation signal through an optical method, guarantees the high-frequencyperformance of a generated microwave signal, achieves the adjustability of the pulse position of a signal, and enables the microwave signal optical generation method to be abundant.

Description

technical field [0001] The invention relates to the field of microwave photonics and microwave signal generation, in particular to photonic microwave generation technology. Background technique [0002] High-frequency microwave generation technology has always played a key role in optical wireless communication systems, radar systems and sensor networks. At present, microwave frequency bands used and proposed to be used in microwave technology and applications are constantly increasing, which is a great challenge to traditional microwave devices. Therefore, the use of optical methods to generate microwave signals has become an extremely attractive research hotspot. Compared with traditional microwave generation methods, photonics methods have low loss, high bandwidth characteristics, and are not subject to electromagnetic interference. It is worth pointing out that the frequency of microwave signals generated by optical methods is often only limited by the bandwidth of phot...

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Problems solved by technology

Due to the use of spatial light modulators in the former, the complexity of the system is relatively high; the modulation format of the microwave signal generated by the latter is relatively single, mostly sinusoidal

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