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Equilibrium Modal Power Distribution Measurement of Step-index Hard Plastic Cladding and Graded-index Silica Multimode Fibers

Tao, R; Hayashi, T; Kagami, M; Kobayashi, S; Yasukawa, M; Yang, H; Robinson, D; ... Selviah, DR; + view all (2015) Equilibrium Modal Power Distribution Measurement of Step-index Hard Plastic Cladding and Graded-index Silica Multimode Fibers. In: Schröder, H and Chen, RT, (eds.) Optical Interconnects XV. SPIE: San Francisco, CA, USA. Green open access

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Abstract

A stable reproducible optical standard source for measuring multimode optical fiber attenuation is required as recent round robin measurements of such fibers at several international companies and national standards organizations showed significant variation when using a source having only the encircled flux in the near field emerging from it defined. The paper presents and compares the far field modal power distributions for (i) 2 km and 3 km step-index multimode Hard Plastic Cladding Fibers, HPCF, (SI-MMF) with 200 μm silica core diameter, 0.37 numerical aperture (NA) and polymer cladding, (ii) a 10 m silica graded-index multimode fiber (GI-MMF) with 50 μm core diameter and 0.2 NA, and (ii) a near field Encircled Flux Mode Convertor or “modcon”. A free space method for measuring the far field using a Lightemitting diode (LED) centered at 850 nm wavelength with 40 nm 10 dB-bandwidth and a charge-coupled device (CCD) camera is compared with a f-theta multi-element lens based far field pattern (FFP) system. Mandrels of different diameter and different numbers of turns of the fiber around them were used to achieve an equilibrium mode distribution (EMD) for the GI-MMF. The paper defines encircled angular flux (EAF) as the fraction of the total optical power radiating from a multimode optical fiber core within a certain solid angle in the far field. The paper calculates the EAF when the solid angle increases from the far field centroid.

Type: Proceedings paper
Title: Equilibrium Modal Power Distribution Measurement of Step-index Hard Plastic Cladding and Graded-index Silica Multimode Fibers
Event: Optical Interconnects XV
Open access status: An open access version is available from UCL Discovery
DOI: 10.1117/12.2079355
Publisher version: http://dx.doi.org/10.1117/12.2079355
Language: English
Additional information: Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Keywords: EAF, encircled angular flux, far field, Fraunhofer diffraction, modal power distribution, equilibrium modal distribution, mandrel, SIMMF, GIMMF
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1497162

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