Recent developments in photonics-based microwave image-reject mixers (IRMs) are reviewed\nwith an emphasis on the pre-filtering method, which applies an optical or electrical filter to remove the\nundesired image, and the phase cancellation method, which is realized by introducing an additional\nphase to the converted image and cancelling it through coherent combination without phase shift.\nApplications of photonics-based microwave IRM in electronic warfare, radar systems and satellite\npayloads are described. The inherent challenges of implementing photonics-based microwave IRM to\nmeet specific requirements of the radio frequency (RF) system are discussed. Developmental trends of\nthe photonics-based microwave IRM are also discussed.
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