Differential group delay behavior in homogeneous weakly coupled multicore fiber under bending and twisting condition

Ultrasensitive vector bending sensor based on multicore optical fiber.

In this Letter, we demonstrate a compellingly simple directional bending sensor based on multicore optical fibers (MCF). The device operates in reflection mode and consists of a short segment of a three-core MCF that is fusion spliced at the distal end of a standard single mode optical fiber. The asymmetry of our MCF along with the high sensitivity of the supermodes of the MCF make the small be...

Fiber optic sensors based on strongly coupled multicore fiber

We report on the use of a multi-core fiber (MCF) for accurate sensing of temperature, strain, bending, and vibrations in real-world environments and under harsh conditions including temperatures up to 1000 oC. OCIS codes: (060.2370) Fiber optics sensors; (280.4788) Optical sensing and sensors; (060.4005) Microstructured fibers; (060.2280) Fiber design and fabrication.

Twisting and bending stress in DNA minicircles.

The interplay between bending of the molecule axis and appearance of disruptions in circular DNA molecules, with ∼100 base pairs, is addressed. Three minicircles with different radii and almost equal contents of AT and GC pairs are investigated. The DNA sequences are modeled by a mesoscopic Hamiltonian which describes the essential interactions in the helix at the level of the base pair and inc...

Differential birefringence in Bragg gratings in multicore fiber under transverse stress.

We present experimental measurements of the peak splitting of the reflection spectra of fiber Bragg gratings as a result of birefringence induced by transverse loading of a multicore fiber. Measurements show that the splitting is a function of the applied load and the direction of the load relative to the azimuth of the fiber. A model for calculating the stress in the fiber that is due to an ap...

Damage Detection of Carbon Fiber-reinforced Concrete Under Bending Test