Dong-Nhat Nguyen, a postdoc from Czech Technical University in Prague, Czech Republic made a 1-month stay at Instituto de Telecomunicaciones y Aplicaciones Multimedia, Universitat Politècnica de Valencia, Spain under the supervision of Prof. Beatriz Ortega to carry out the research on bidirectional microwave photonic links for 5G. During his STSM, he worked on both experiments and simulation of the 5G NR and multiband signals transmission over seamless full-duplex radio-over-fiber and free-space optics systems at sub-6 GHz and mmW frequencies using a low-cost DML. Furthermore, current and future collaboration between the two research groups have been further consolidated.