A NEW PHOTONIC SCHEME FOR GENERATING 10-FOLD FREQUENCY MILLIMETER-WAVE SIGNALS BASED ON FOUR PARALLEL POLARIZATION MODULATORS

The paper offers a detailed design and simulation analysis of a frequency 10-tupling millimeter-wave (mm-wave) signal generation method based on polarization modulation and optical sideband selection.In modern wireless communication systems, the need for high-frequency, high-capacity, and low-loss signal transmission has been continuously increasing.mm-wave technology, operating between 30 GHz and 300 GHz, provides a promising solution because of its wide bandwidth and high data rate potential.However, producing stable and pure mm-wave signals at high frequencies, especially at multiples of a base radio frequency, presents significant technical obstacles.Traditional direct frequency multiplication methods face issues like inefficient conversion, complex circuitry, and unwanted harmonic generation.To overcome these limitations, the proposed scheme uses polarization modulation and optical sideband filtering to achieve high-order frequency multiplication with better sideband suppression.The method involves a continuous wave laser, polarization controllers, polarization modulators (PolMs), electrical phase shifters, and a photodiode to produce a pure 10th-order mm-wave signal.By adjusting polarization angles, phase shifts, and modulation indices, unwanted harmonics are effectively removed.Simulation results show the accuracy and feasibility of the scheme, with the generated mm-wave signal having a high optical sideband suppression ratio of 63.6 dB and a radio frequency sideband suppression ratio of 56.089 dB.Although potential issues like bias-voltage drift, modulation-index inaccuracies, and the finite extinction ratios of PolMs may occur, the scheme provides a promising method for high-frequency mm-wave signal generation.