Distributed Measurement of Regeneration Ratios of an Apodized Type I Fiber Bragg Grating

Distributed bonding interface characterization of composite laser crystal based on optical low-coherence reflectometry

“…OLCR originated from the theory of partial coherence [10] and was practically developed and applied in the field of fiber optic sensing [11] and fiber fault diagnosis [12][13] in the 1980s. In recent years, it has gradually expanded to the testing of polarization-maintaining fibers [14] , active fiber [15][16] , fiber optic devices ( FBGs [17] , couplers [18] , etc. ), and bulk optical devices (such as surface inspection [19] and thin film thickness measurement [20] ).…”

Femtosecond Laser Fabricated Apodized Fiber Bragg Gratings Based on Energy Regulation

“…In order to suppress the side lobes in the reflection spectrum and reduce the time delay oscillation, the refractive index modulation amplitude can be changed. The apodization method is adopted to make the refractive index modulation amplitude conform to the distribution effect of the apodization function, which can effectively suppress the side lobes and improve the side lobe suppression ratio [10].…”