Hollow core fiber and optical communication systems

A void core fiber with a photonic crystal structure allows simultaneous transmission in two wavelength bands, addressing the limitations of PBGFs by reducing transmission loss and simplifying design and management in optical communication systems.

JP2026092947APending Publication Date: 2026-06-08FURUKAWA ELECTRIC CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
FURUKAWA ELECTRIC CO LTD
Filing Date
2024-11-27
Publication Date
2026-06-08

AI Technical Summary

Technical Problem

Photonic bandgap fibers (PBGFs) are limited by a narrow wavelength band with low transmission loss, requiring separate designs for different wavelength bands used in data center and long-distance communications, complicating design, manufacturing, and management.

Method used

A void core fiber with a cladding portion forming a photonic crystal around a void core portion, capable of transmitting light in two wavelength bands (1000-1150 nm and 1530-1625 nm) with a transmission loss ratio of 10:1, featuring a void core diameter of 20-30 μm and void diameter of 4-7 μm, and a wall thickness ratio of 0.8-0.99, allowing stable transmission up to 10 m for the first band and over 1 km for the second band.

Benefits of technology

Enables a single design of PBGF suitable for both wavelength bands, simplifying design, manufacturing, and management by achieving low transmission loss across different communication distances.

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Abstract

To provide a photonic bandgap type vacant core fiber suitable for transmission in two wavelength bands, and an optical communication system using the same. [Solution] The porous core fiber comprises a cladding portion having a porous structure arranged to surround the porous core portion and form a photonic crystal in which the porous core portion is a crystal defect, and propagates a first light having a wavelength of 1000 nm to 1150 nm and a second light having a wavelength of 1530 nm to 1625 nm in the porous core portion, and the transmission loss of the first light is 10 times or less the transmission loss of the second light.
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