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

Table 3

Refractive index measurement for various lengths (groove type).

Length; (mm)	Number 01; (nm/RIU)	Number 02; (nm/RIU)	Number 03; (nm/RIU)	Average; (nm/RIU)	Standard deviation; (nm/RIU)
10	17.3	16.3	17.0	16.87	0.51
20	12.2	9.6	10.4	10.73	1.33
30	19.5	19.5	15.6	18.20	2.25
40	54.4	54.4	54.4	54.40	0.00
50	38.4	38.2	38.4	38.33	0.11