Relative Intensity Noise Spectrum and  ωR

To find the RIN, we use the data obtained from the spectral analyzer(RFSA_2) and the power meter(PWM_1) using a script to calculate RIN and create a plot of RIN against the frequencies. Fig. 15. shows this graph, and shows the trend that as the input current is increased, the lower the noise. This is further demonstrated on the right of Fig .15. , which shows the relation of the modulation currents. The relaxation oscillation frequency, ωR is the peak of the RIN spectrum graph, which is found graphically to be 0.88GHz. Furthermore, we find that the RIN at 1GHz is averaged at -150.8dB/Hz.