Impact of Unbalanced Interferometer on Laser Frequency Sweep Linearization

Laser frequency sweep linearization is achieved using an auxiliary unbalanced interferometer, in which the impact of the fiber delay line is analyzed. The short fiber delay line reduces the linearization accuracy and ranging resolution. In the experiment, ranging resolution can be enhanced by eight times if the fiber delay line length is lengthened from 10 cm and 5 m. For the fiber shorter than 1 m, it is infeasible to obtain a residual nonlinearity smaller than 10
⁻⁷
• This work gives the limitation of fiber length in the auxiliary interferometer for laser frequency sweep linearization.