부산대학교 도서관

A high-repetition-rate linear scanning scheme based on a photoelectric feedback loop and consisting of an self-heterodyne optical link and a phase-locked electrical link is proposed. By using a pre-modulated current waveform, the nonlinear error of the linear sweep triangular output can be reduced, and the error can be captured by the phase-locked loop. Then, a phase-locked feedback loop is implemented to reduce the nonlinear error of the laser output. This scheme utilizes a simple commercial DFB laser as the light source. The system can achieve optimized linearity of the 31.25 kHz repetition rate triangular sweep. The maximum error can be optimized from 6% to 0.5%. The linear regression constant of triangular sweep is optimized from $1.7 \times 10^{-3}$ to $1 \times 10^{-5}$. In addition, the extraction and processing methods of error signals were theoretically analyzed.