Single-pass-band tunable microwave photon filter based on broad band light source

Abstract

The invention provides a single-pass-band tunable microwave photon filter based on a broad band light source. The single-pass-band tunable microwave photon filter based on the broad band light source comprises the light source used for providing broad band light, a polarization modulator connected with the light source and used for adjusting the polarization direction of the broad band light in the fast axis direction and the slow axis direction of the polarization modulator respectively, a difference group delayer connected with the polarization modulator and used for conducting phase position delay on the adjusted broad band light, a polarization analyzer connected with the difference group delayer and used for combining delay light on the fast axis and delay light on the slow axis, a dispersive medium connected with the polarization analyzer and used for enabling the combined light to pass through the dispersive medium and conducting filtering on the combined light and a photoelectric detector connected with the dispersive medium and used for detecting electric signals modulated on the combined light. According to the filter, direct current bias of the polarization modulator does not need to be set, base band response and power declining caused by the dispersive medium can be eliminated, and the shape of a filter pass band is kept unchanged.

Description

technical field [0001] The invention relates to the field of microwave photon technology, in particular to a single-passband tunable microwave photon filter based on a wide-spectrum light source. Background technique [0002] The microwave photonic filter is a new type of device that modulates the microwave signal onto the light wave and uses photon technology to process the amplitude and phase of the microwave signal. Drawing on the traditional electrical digital signal processing method, the existing microwave photonic filter is to carry the microwave signal On different optical carrier taps, each microwave signal is time-delayed and weighted combined. Compared with traditional electrical microwave filters, existing microwave photonic filters have the advantages of high operating frequency, large bandwidth, low loss, and anti-electromagnetic interference. Microwave photonic filters can be divided into finite impulse response microwave photonic filters and infinite impulse...

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Problems solved by technology

In addition, when SSB modulation is used, the frequency domain response curve of the filter will have a large baseband response in addition to the required passband, which is likely to cause damage to the microwave system.

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