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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Highly polarization-dependent periodic coupling in mechanically induced long period grating over air-silica fibers

D Lee1, Y Jung, Y S Jeong

  • 1Department of Information and Communications, Gwangju Institute of Science and Technology, South Korea.

Optics Letters
|February 17, 2006
PubMed

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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.