Germanate glass core fiber GDF-SM-3.5/125-50
Higly Ge-doped silica fibers are used for variety of nonlinear applications.
Please see frequently asked questions below.
Typical loss spectrum
High germania core fiber
|Core diameter, µm||4 x 3 (elliptical)|
|Clading diameter, µm||125 ± 1|
|Coating diameter, µm||260 ± 10|
|GeO2 concentration, %||50|
|Cutoff wavelength, µm||~ 1.92|
|Attenuation (at 1060nm), dB/km||23|
|Attenuation (at 1300nm), dB/km||12|
|Attenuation (at 1550nm), dB/km||6.7|
|Attenuation (at 1850nm), dB/km||~ 7|
|Attenuation (at 2100nm), dB/km||49|
FREQUENTLY ASKED QUESTIONS:
Is there any explanation why the GDF-SM-3.5/125-50 has a 4 x3 µm elliptical core?
Viscosity of glass with very high germanium concentration is much lower compared with silica glass of the support tube. So, during the high temperature preparation of the preform in MCVD process the core tends to have some ellipticity. It takes place not in every preform (and hence in fiber) but often enough.
Is it already a PM fiber? Does it splice well to standard PM fiber?
Mayby yes but we did not study its PM properties.
Do you have any advice about the best way how to splice this fiber?
This fiber is spliced well with the standard fiber like SMF-28. Maybe you have to decrease the power and/or duration of the arc in the splicing machine as much as possible.
FORC PUBLICATIONS OF GERMANATE GLASS CORE FIBERS
Publication: Vol. 27, No. 20 / 30 September 2019 / Optics Express. Autor: YANHONG LI, TUANJIE DU, BIN XU, HUIYING XU, ZHIPING CAI, VALERY M. MASHINSKY, AND ZHENGQIAN LUO
Publication: Vol. 27, No. 24 / 25 November 2019 / Optics Express. Autor: TUANJIE DU,YANHONG LI,HONGJIAN WANG,ZHIHAO CHEN,VALERY M. MASHINSKY, AND ZHENGQIAN LUO
Publication: Laser Phys. Lett. 9, No. 3, 219-222 (2012). Author: V. A. Kamynin, A. S. Kurkov, V. M. Mashinsky
Journal: LIGHTWAVE TECHNOLOGY, VOL. 23, NO. 11, NOVEMBER 2005. Autor: Evgeny M. Dianov, Member, IEEE, and Valery M. Mashinsky
Publication: OPTICS LETTERS / Vol. 29, No. 22 / November 15, 2004. Autor: V. M. Mashinsky, V. B. Neustruev, V. V. Dvoyrin, S. A. Vasiliev, O. I. Medvedkov, I. A. Bufetov, A. V. Shubin, A. N. Guryanov, V. F. Khopin, and M. Yu. Salgansky and E. M. Dianov
Publication: ECOC 2004, Autor: M.M.Bubnov