INVESTIGATION OF SEASUREMENT OF NOISE IN LASER DIODES FOR HIGH DATA RATE BROADBAND TELECOMMUNICATION SYSTEMS

The aim of this poster is two fold. Firstly to describe the importance of noise in laser diodes used in high data rate broadband telecommunication systems. Secondly to describe a novel technique for measuring the Relative Intensity Noise (RIN) as a function of frequency up to 20GHz with high sensitivities less than – 171 dBm/Hz. It will be shown that this technique provides an adjustable shot noise level and by comparing the adjustable flat noise spectrum with the test spectrum, the main traceable path is determined using measured DC photocurrent . experimental results will be presented to illustrate that frequency dependence of errors, particularly those due to responsivity, gain and misumatch etc, are significantly reduced and precision <0.4dB have been achieved.

Keywords:

Laser Diodes , Noise Measurement , Broadband Systems , Optical Commonications