Abstract
The effect of external feedback on an isolator free transmitter was investigated experimentally by measuring relative intensity noise (RIN). The experiments were done under the possible conditions that might happen during operation such as external reflection and temperature change. In addition to that, the effect of reflection depending on the types of source which DFB and FP LD are widely used for that. Finally, LD to Fiber alignment under external reflection was demonstrated. It was found that the effect of external reflection was dominant factor compared with temperature change and FP LD is less affected by reflection than DFB LD. The maximum RIN occurs at the maximum coupling position of LD and fiber and the minimum RIN exists near the maximum coupling position, which can be used to optimize the coupling and RIN tolerance according to the alignment position by changing the lens focal length.
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