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Writing Bragg Gratings in Multicore Fibers
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A large effective area multi-core fiber with an optimized cladding thickness.

Katsuhiro Takenaga1, Yoko Arakawa, Yusuke Sasaki

  • 1Optics and Electronics Laboratory, Fujikura Ltd. 1440, Mutsuzaki, Sakura, Chiba, 285-8550, Japan. katsuhiro.takenaga@jp.fujikura.com

Optics Express
|January 26, 2012
PubMed
Summary
This summary is machine-generated.

Investigating trench-assisted multi-core fibers revealed that cladding thickness is limited to approximately 40 µm to prevent excess loss in outer cores. Multi-core fibers can tolerate micro-bending better than single-core fibers.

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Area of Science:

  • Optical Fiber Technology
  • Photonics
  • Telecommunications

Background:

  • Multi-core fibers (MCFs) offer increased transmission capacity.
  • Trench-assisted MCFs are designed to mitigate crosstalk between cores.
  • Cladding thickness is a critical parameter affecting MCF performance, particularly outer core losses.

Purpose of the Study:

  • To theoretically and experimentally investigate the impact of cladding thickness on excess losses in the outer cores of trench-assisted MCFs.
  • To determine the minimum allowable cladding thickness for MCFs without introducing significant excess loss.
  • To assess the micro-bending loss tolerance of MCFs compared to single-core fibers.

Main Methods:

  • Theoretical analysis of cladding thickness effects on outer core excess loss.
  • Experimental fabrication and characterization of trench-assisted MCFs with varying cladding thicknesses.
  • Measurement of micro-bending loss and excess loss in fabricated MCFs.

Main Results:

  • No significant micro-bending loss increase was observed for cladding thicknesses around 30 µm.
  • MCFs exhibit a larger tolerance to micro-bending loss compared to single-core fibers.
  • Excess loss in outer cores limits the reduction of cladding thickness to approximately 40 µm.

Conclusions:

  • A cladding thickness of around 40 µm is a practical limit for trench-assisted MCFs to avoid excess outer core loss.
  • A multi-core fiber with an 110 µm² effective area and 181 µm cladding diameter was successfully fabricated without excess loss.