Suppression of Relative Intensity and Mode Partition Noises in Orthogonally Polarized Dual-Wavelength VCSEL

A synthesizer-free 28-GHz millimeter wave (MMW) carrier is generated by using orthogonally polarized dual-wavelength vertical-cavity surface-emitting laser (VCSEL) as the frontend transmitter. After equalizing the dual modes with an extremely weak power as low as -26 dBm (2.5 μW) at TM-mode polarization, the dual-wavelength power extinction of only 5.4 dB is achieved for optimizing the remote-node optical heterodyne of 28-GHz MMW carrier with a peak power of -59.8 dBm before antenna propagation with remaining similar relative intensity noise (RIN) as compared to the free-running case. Moreover, the mode partition noise (MPN) is increased less than 2 dBc/Hz by TM-mode injection at -26 dBm, whereas the TE-mode control results in unchanged noise spectrum as same as that obtained in free-running case even if the master power is increased to -18 dBm.