Effect of external cavity length on self-mixing signals in a multilongitudinal-mode Fabry-Perot laser diode

摘要

The effect of external-cavity length on self-mixing signals in a multilongitu dinal-mode Fabry-Perot laser diode (FP-LD) was investigated experimentally. It has been shown that the output waveforms of selfmixing signals vary periodically when the length of the external cavity changes. This result agrees well with our theoretical calculations for the self-mixing effect of two adjacent longitudinal modes in a FP-LD. Moreover, the time-averaged output intensities of self-mixing signals has also been measured and compared with theoretical analysis.