title: Measuring the feedback parameter of a semiconductor laser with external optical feedback.
abstract: Feedback parameter (the C factor) is an important parameter for a semiconductor laser operating in the regime of external optical feedback. Self-mixing interferometry (SMI) has been proposed for the measurement of the parameter, based on the time-domain analysis of the output power waveforms (called SMI signals) in presence of feedback. However, the existing approaches only work for a limited range of C, below about 3.5. This paper presents a new method to measure C based on analysis of the phase signal of SMI signals in the frequency domain. The proposed method covers a large range of C values, up to about 10. Simulations and experimental results are presented for verification of the proposed method.
authors.affiliation: School of Electrical Computer and Telecommunications Engineering, University of Wollongong, Wollongong, NSW 2522, Australia. yanguang@uow.edu.au
authors.forename: Yanguang
authors.initials: Y
authors.lastname: Yu
authors.forename: Jiangtao
authors.initials: J
authors.lastname: Xi
authors.forename: Joe F
authors.initials: JF
authors.lastname: Chicharo