Optical fiber profiles using the refracted near-field technique: a comparison with other methods

M. J. Saunders

doi:10.1364/AO.20.001645

Applied Optics
Vol. 20,
Issue 9,
pp. 1645-1651
(1981)
•https://doi.org/10.1364/AO.20.001645

Optical fiber profiles using the refracted near-field technique: a comparison with other methods

M. J. Saunders

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M. J. Saunders, "Optical fiber profiles using the refracted near-field technique: a comparison with other methods," Appl. Opt. 20, 1645-1651 (1981)

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Abstract

Multimode fiber profiles by the refracted near-field method (RNF) agree to within ±0.5% with profiles obtained by the highly accurate interferometric slab technique in regions of adequate resolution of the latter. Nineteen multimode fiber profiles by the RNF and transverse interferometric methods differ in Δ and α on the average by 4% and 3%, respectively. The precision of a refractive-index determination by the RNF technique is 4 × 10⁻⁵. A rapid method of calibrating the profiles by measuring the liquid temperature is presented, and the effect of foreign matter on the fiber face is discussed.

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Fiber				Refracted near field				Transverse interferometry
Fiber				α_r	α_L	$\bar{α}$	$\bar{Δ}$	α_r	α_L	$\bar{α}$	$\bar{Δ}$
1				2.05	2.02	2.04		1.88	2.07	1.97	0.0107
				2.12	1.95	2.04	0.0109	1.88	2.07	1.97	0.0107
2				2.33	2.38	2.36		2.29	2.45	2.37
3							0.0112				0.0116
4
	{	(Elliptical core)	}
		Major axis		2.20	2.39	2.30	0.0146	1.89	2.31	2.10	0.0133
		Minor axis		2.46	2.63	2.55	0.0150	2.20	2.15	2.17	0.0164
		45°		2.46	2.12	2.29	0.0148	2.25	2.25	2.25	0.0142
5				2.07	2.07	2.07	0.0110			2.13	0.0109
6				2.07	2.07	2.07	0.0109			2.07	0.0109
7				2.08	2.16	2.12	0.0123	1.92	2.24	2.08	0.0114
8				1.91	2.28	2.10	0.0126	1.95	2.06	2.00	0.0116
9				2.07	1.58	1.83	0.0126	1.69	1.73	1.71	0.0126
10				1.90	1.88	1.89	0.0118	1.96	2.03	2.00	0.0115
11				1.95	1.86	1.91	0.0153	1.98	1.92	1.95	0.0156
12				1.90	1.88	1.89	0.0203	1.78	1.90	1.84	0.0217
13				2.00	1.72	1.86	0.0174	1.88	1.95	1.91	0.0160
14							0.0120				0.0119
15							0.0113				0.0112
16							0.0130				0.0135
17							0.0126				0.0128
18							0.0128				0.0144
19							0.0132				0.0137

Preform or fiber	Fiber Δ	Preform Δ
26	0.0030	0.0029
27	0.0024	0.0026
28	0.0034	0.0031
29	0.0051	0.0055
30	0.0048	0.0049

Fiber				Refracted near field				Transverse interferometry
Fiber				α_r	α_L	$\bar{α}$	$\bar{Δ}$	α_r	α_L	$\bar{α}$	$\bar{Δ}$
1				2.05	2.02	2.04		1.88	2.07	1.97	0.0107
				2.12	1.95	2.04	0.0109	1.88	2.07	1.97	0.0107
2				2.33	2.38	2.36		2.29	2.45	2.37
3							0.0112				0.0116
4
	{	(Elliptical core)	}
		Major axis		2.20	2.39	2.30	0.0146	1.89	2.31	2.10	0.0133
		Minor axis		2.46	2.63	2.55	0.0150	2.20	2.15	2.17	0.0164
		45°		2.46	2.12	2.29	0.0148	2.25	2.25	2.25	0.0142
5				2.07	2.07	2.07	0.0110			2.13	0.0109
6				2.07	2.07	2.07	0.0109			2.07	0.0109
7				2.08	2.16	2.12	0.0123	1.92	2.24	2.08	0.0114
8				1.91	2.28	2.10	0.0126	1.95	2.06	2.00	0.0116
9				2.07	1.58	1.83	0.0126	1.69	1.73	1.71	0.0126
10				1.90	1.88	1.89	0.0118	1.96	2.03	2.00	0.0115
11				1.95	1.86	1.91	0.0153	1.98	1.92	1.95	0.0156
12				1.90	1.88	1.89	0.0203	1.78	1.90	1.84	0.0217
13				2.00	1.72	1.86	0.0174	1.88	1.95	1.91	0.0160
14							0.0120				0.0119
15							0.0113				0.0112
16							0.0130				0.0135
17							0.0126				0.0128
18							0.0128				0.0144
19							0.0132				0.0137

Preform or fiber	Fiber Δ	Preform Δ
26	0.0030	0.0029
27	0.0024	0.0026
28	0.0034	0.0031
29	0.0051	0.0055
30	0.0048	0.0049

Abstract

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Applied Optics