EuroWire November 2024

Technical Article

Figure 4 shows the attenuation of the SMFs as a function of temperature. Figure 5 shows the attenuation of MCFs as a function of temperature. Figure 6 shows the attenuation distribution at -40°C for the SMFs and MCFs. The cable was also tested according to the following GR-20 with passing results for mechanical and environmental tests.

Test

Section

Result

Figure 3: Attenuation loss for ten concatenated MCFs

Low and high temperature cable bend

6.5.3

Pass

Impact resistance

6.5.4

Pass

Cable compressive strength

6.5.5

Pass

Cable tensile strength

6.5.6

Pass

Cable twist

6.5.7

Pass

Cable cyclic flexing

6.5.8

Pass

Temperature cycling

6.6.3

Pass

Cable ageing

6.6.4

Pass

Water penetration

6.6.7

Pass

Figure 4: SMF attenuation as a function of temperature

5. Results/conclusions The MCF exhibited low splice loss, which certainly was helped by all fibres coming from the same preform. The MCF cores performed as good as or better than standard single mode fibres in temperature cycling. The cable with MCFs passed all GR-20 cable tests performed.

6. References

[1] Y. Sasaki et al., “Variations in the Optical Characteristics of 200μm and 250μm Coated Multicore Fibres Owing to Cabling,” ECOC’21, paper We1A.5 [2] P. Sillard et al., “Simple Multi-Core Fiber Fabrication Method,” ECOC’22, paper Th1A.1 [3] T. Matsui et al., “Design of multi-core fiber in 125μm cladding diameter with full compliance to conventional SMF,” presented at ECOC’15, Valencia, Spain, paper We.4.3 (2015) [4] P. Sillard, “Advances in Few-Mode Fiber Design and Manufacturing,” OFC’20, paper W1B.4

Figure 5: MCF attenuation as a function of temperature

Courtesy of IWCS Cable & Connectivity Symposium, Charlotte, North Carolina, USA

Prysmian Group 700 Industrial Drive, Lexington, SC 29072 USA Tel: +1 803 951 1001 Email: don.parris@prysmiangroup.com Website: www.prysmian.com

Figure 6: Attenuation distribution for the SMFs and MCFs

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November 2024