My freshman year is electronic information science and integrated circuits, and my sophomore year is divided into electronic information engineering, electronic information science, electronic information technology and optical information science and technology. If you want to take the postgraduate entrance examination, I suggest you study optics. Telecommunications is a bit out of date now. It's all fiber optics. Majors are characteristic majors, some good teachers are bad, depending on luck, but the university has basically taught itself ... Except for optical communication, other professional courses are similar, and the basic course of optical communication is similar.