OCI1500 can be used to measure grating microstructure and spectrum, and evaluate the quality of gratings. The following figures show the measurement results of four gratings.
Each fiber has three complete gratings. The length of gratings shown by figure (a) and figure (b) are 800μm and 200μm, and the grating area is displayed as a neat sawtooth pattern. The reflectivity of each point on the grating is basically consistent, which indicates that the grating has good structure. Figure (c) and Figure (d) show gratings with the length of 200μm and the reflectivity of some points on the gratings are inconsistent which indicates structural defective. Figure 2 shows the spectrum of grating (a).
Figure 1. Measurement results of four gratings
Figure 2. Spectrum of grating (a)