Separation of total-loss data into its absorption and scattering components: a
more accurate model for fiber loss

F. T. Stone

doi:10.1364/AO.21.002721

Applied Optics
Vol. 21,
Issue 15,
pp. 2721-2726
(1982)
•https://doi.org/10.1364/AO.21.002721

Separation of total-loss data into its absorption and scattering components: a more accurate model for fiber loss

F. T. Stone

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F. T. Stone, "Separation of total-loss data into its absorption and scattering components: a more accurate model for fiber loss," Appl. Opt. 21, 2721-2726 (1982)

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Abstract

A technique is presented that uses total-loss data from a conventional monochromator-based spectral-loss measurement set to obtain not only the Rayleigh and wavelength-independent scattering of a fiber but also the UV-band-edge absorption. That absorption causes the total-loss data to deviate significantly from a straight line when the data are plotted vs λ on a 1/λ⁴ scale. Including the absorption term accounts for the deviation from a straight line over an extended wavelength region (0.66–1.16 μm) and materially affects the A and B coefficients obtained. For one fiber examined in detail A went from 1.30 to 1.13 μm⁴ dB/km and B from 0.22 to 0.32 dB/km when the UV absorption was included. This technique also eliminates the problem of negative B coefficients and allows processing variables that affect absorption to be separated from those that affect scattering.

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Fiber 3071	Wavelength region of fita (μm)	A coefficient (μm⁴ dB/km)	B coefficient (dB/km)	Correlation coefficient	Standard deviation (dB/km)
First data set	0.78–1.16	1.35	0.10	0.9978	0.024
	0.66–1.16	1.52	−0.11	0.9926	0.148
Second data set	0.78–1.16	1.29	0.25	0.9986	0.027
	0.66–1.16	1.55	−0.08	0.9872	0.111
Third data set	0.78–1.16	1.30	0.22	0.9988	0.023
	0.66–1.16	1.56	−0.11	0.9880	0.110

Fiber 3071	Methoda	A coefficient (μm⁴ dB/km)	B coefficient (dB/km)	C coefficient (dB/km)	D coefficient (μM)	Correlation coefficient		Standard deviation (dB/km)
Fiber 3071	Methoda	A coefficient (μm⁴ dB/km)	B coefficient (dB/km)	C coefficient (dB/km)	D coefficient (μM)	abs.	scatt.	Standard deviation (dB/km)
First data set	I	1.15	0.20	6.67 × 10⁻⁵	6.95	0.9866	0.9995	0.037
	G	1.18	0.20	2.16 × 10⁻⁵	7.67	0.9880	0.9995	0.036
Second data set	I	1.11	0.36	3.32 × 10⁻⁵	7.43	0.9981	0.9998	0.021
	G	1.11	0.36	2.84 × 10⁻⁵	7.53	0.9983	0.9999	0.021
Third data set	I	1.12	0.33	4.10 × 10⁻⁵	7.29	0.9974	0.9999	0.021
	G	1.13	0.32	2.92 × 10⁻⁵	7.50	0.9978	0.9999	0.021

	σA (μ⁴ dB/km)	σ_B (dB/km)	σ_C (dB/km)	σ_Dμm)	Wavelength region (μm)
Conventional technique
First data set	0.018	0.027	Assumed	Absent	0.78–1.16
First data set	0.032	0.075	Assumed	Absent	0.66–1.16
Second data set	0.014	0.021	Assumed	Absent	0.78–1.16
Second data set	0.042	0.107	Assumed	Absent	0.66–1.16
Third data set	0.018	0.029	Assumed	Absent	0.78–1.16
Third data set	0.041	0.104	Assumed	Absent	0.66–1.16
Present technique
First data set	0.018	0.022	1.0 × 10⁻⁶	*	0.66–1.16
Second data set	0.009	0.012	5.7 × 10⁻⁷	*	0.66–1.16
Third data set	0.009	0.012	6.0 × 10⁻⁷	*	0.66–1.16

Fiber 3071	Wavelength region of fita (μm)	A coefficient (μm⁴ dB/km)	B coefficient (dB/km)	Correlation coefficient	Standard deviation (dB/km)
First data set	0.78–1.16	1.35	0.10	0.9978	0.024
	0.66–1.16	1.52	−0.11	0.9926	0.148
Second data set	0.78–1.16	1.29	0.25	0.9986	0.027
	0.66–1.16	1.55	−0.08	0.9872	0.111
Third data set	0.78–1.16	1.30	0.22	0.9988	0.023
	0.66–1.16	1.56	−0.11	0.9880	0.110

Fiber 3071	Methoda	A coefficient (μm⁴ dB/km)	B coefficient (dB/km)	C coefficient (dB/km)	D coefficient (μM)	Correlation coefficient		Standard deviation (dB/km)
Fiber 3071	Methoda	A coefficient (μm⁴ dB/km)	B coefficient (dB/km)	C coefficient (dB/km)	D coefficient (μM)	abs.	scatt.	Standard deviation (dB/km)
First data set	I	1.15	0.20	6.67 × 10⁻⁵	6.95	0.9866	0.9995	0.037
	G	1.18	0.20	2.16 × 10⁻⁵	7.67	0.9880	0.9995	0.036
Second data set	I	1.11	0.36	3.32 × 10⁻⁵	7.43	0.9981	0.9998	0.021
	G	1.11	0.36	2.84 × 10⁻⁵	7.53	0.9983	0.9999	0.021
Third data set	I	1.12	0.33	4.10 × 10⁻⁵	7.29	0.9974	0.9999	0.021
	G	1.13	0.32	2.92 × 10⁻⁵	7.50	0.9978	0.9999	0.021

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Applied Optics