Photonic millimeter-wave generation and transmission techniques for the high-frequency Radio Interferometers

A method to generate two optical signals is the lithium niobate Mach-Zehnder optical intensity modulator which is capable of generating two highly stable optical signals by applying a sinusoidal microwave signal to an input laser signal. During the signal transmission through the fiber cable, the cable length delay fluctuation is caused together with polarization mode dispersion, which will impact the performance of coherent signal distribution. The phase stabilizer is developed by using the double difference round-trip phase measurement method with Michelson´s interferometer. The roundtrip phase measurement is performed on each lightwave signal separately.