Large-dynamic-range microwave photon I/Q down-conversion device and adjusting metho

The invention provides a large-dynamic-range microwave photon I/Q down-conversion device and an adjusting method. The large-dynamic-range microwave photon I/Q down-conversion device and the adjustingmethod are realized by utilizing a polarization multiplexing dual-parallel Mach-Zehnder modulator, a dual-channel wavelength division multiplexer, an electric power divider, an electric attenuator anda photoelectric detector. The microwave photon I/Q down-conversion system utilizes an integrated PDM-DPMZM to realize microwave photon down-conversion, realizes non-linear distortion suppression of down-conversion signals by reasonably setting the attenuation amount of the electric attenuator, realizes phase orthogonality of the down-conversion signals by reasonably setting the direct current bias point of the modulator, and finally obtains a microwave photon I/Q down-conversion system with a large dynamic range. The large-dynamic-range microwave photon I/Q down-conversion device and the adjusting method are simple in