Optical Coupling Structures of Fiber-Optic Mach-Zehnder Interferometers Using CO₂ Laser Irradiation

Table 5

Refractive index measurement results for the reduced 𝐿 range.

Length (mm)	Slope (nm/RIU)	𝑅-square
8	12.6	0.95677
13	34.1	0.89198
38	59.7	0.93973
43	38.6	0.91275