Fiber-embedded micro-Faraday rotator for the infrared

Kazuo Shiraishi

doi:10.1364/AO.24.000951

Fiber-embedded micro-Faraday rotator for the infrared

Kazuo Shiraishi

Applied Optics
Vol. 24,
Issue 7,
pp. 951-954
(1985)
•https://doi.org/10.1364/AO.24.000951

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Kazuo Shiraishi, "Fiber-embedded micro-Faraday rotator for the infrared," Appl. Opt. 24, 951-954 (1985)

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History
- Original Manuscript: June 19, 1984
- Published: April 1, 1985

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Abstract

An infrared Faraday rotator embedded in a fiber is proposed and fabricated using Gd₃₋_xBi_xFe₅O₁₂ single crystals; the specific bismuth substitution x was ∼0.9 in our experiments. Insertion losses for multimode and single-mode fibers are 2.9 and 4.3 dB at the 1.29-μm wavelength, respectively, and 4.3 and 6.7 dB at the 0.78-μm wavelength, respectively. It is shown that insertion losses would be decreased by increasing the bismuth substitution x. The fiber-embedded micro-Faraday rotator can be used in a fiber isolator not only for 1.3 μm but also for 0.8-μm wavelength regions.

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	Single-mode Fiber		Multimode fiber
Wavelength (μm)	0.78	1.29	0.78/1.29
Effective cutoff wavelength (μm)	0.76	1.20	—
Core diameter (μm)	5.0	9.1	51
Outer diameter (μm)	125	130	120
Relative index difference (%)	0.29	0.24	${}^{0.93}{(\begin{array}{l} α - profile \\ is 1.8 \end{array})}$
Transmission loss at λ = 1.3 μm (dB/km)	2.83	0.7	1.28

	Single-mode fiber		Multimode fiber
Wavelength (μm)	0.78	1.29	0.78	1.29
Measured insertion loss (dB)	6.7	4.3	4.3	2.9
Diffraction loss (dB)	1.1	2.6	≲0.1	≲1.3
Absorption loss (dB)	3.3	∼0	3.3	∼0
Fresnel reflection loss (dB)	0.5	0.5	0.5	0.5
Misalignments loss (dB)	1.8	1.2	0.4	1.1

	Single-mode fiber		Multimode fiber
Wavelength (μm)	0.78	1.29	0.78	1.29
Specific rotation (deg/μm)	1.043	0.229	1.043	0.229
Thickness for 45° Faraday rotation (μm)	43	197	43	197
Diffraction loss (dB)	0.28	1.36	0	≲0.6
Absorption loss (dB)	1.7	0	1.7	0
Total loss (dB)	2.0	1.4	1.7	≲0.6

	Single-mode Fiber		Multimode fiber
Wavelength (μm)	0.78	1.29	0.78/1.29
Effective cutoff wavelength (μm)	0.76	1.20	—
Core diameter (μm)	5.0	9.1	51
Outer diameter (μm)	125	130	120
Relative index difference (%)	0.29	0.24	${}^{0.93}{(\begin{array}{l} α - profile \\ is 1.8 \end{array})}$
Transmission loss at λ = 1.3 μm (dB/km)	2.83	0.7	1.28

	Single-mode fiber		Multimode fiber
Wavelength (μm)	0.78	1.29	0.78	1.29
Measured insertion loss (dB)	6.7	4.3	4.3	2.9
Diffraction loss (dB)	1.1	2.6	≲0.1	≲1.3
Absorption loss (dB)	3.3	∼0	3.3	∼0
Fresnel reflection loss (dB)	0.5	0.5	0.5	0.5
Misalignments loss (dB)	1.8	1.2	0.4	1.1

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