Abstract

Two-core fibers are investigated experimentally. Low-loss birefringent single-mode two-core fibers, consisting of two cores and a pair of stress-inducing parts built in a cladding, were prepared. A power exchange of the order of a few millimeters occurs as a result of the coupling between the two cores. It was noted that the power-transfer efficiency shows a good wavelength selectivity because the fiber parameters, such as the core radius and refractive-index difference between the core and cladding of the two cores, are not identical. The Stokes beam of stimulated four-photon mixing, generated in a core by compensating for the material dispersion with the modal birefringence between the two orthogonally polarized fundamental modes, exclusively couples to the core, whereas the pump, first-order Raman Stokes, and anti-Stokes waves of the four-photon mixing remain uncoupled. This wavelength-selective coupling will be useful for various applications, such as in couplers in a wavelength-multiplexing optical system and in a fiber-optical amplifier.

© 1985 Optical Society of America

Wavelength-selective coupling of two-core optical fiber: application and design

Ken-ichi Kitayama and Yukinori Ishida
J. Opt. Soc. Am. A 2(1) 90-94 (1985)

Coupling instability and power-induced switching with two-core dual-polarizations fiber nonlinear couplers

S. Trillo and S. Wabnitz
J. Opt. Soc. Am. B 5(2) 483-491 (1988)

Single-mode single-polarization fibers: effects of a residual polarization coupling

Giovanni Cancellieri, Paola Fantini, and Mauro Tilio
J. Opt. Soc. Am. A 2(11) 1885-1890 (1985)

Polarization mode coupling with a broadband source in birefringent polarization-maintaining fibers

Kazumasa Takada, Katsunari Okamoto, and Juichi Noda
J. Opt. Soc. Am. A 2(5) 753-758 (1985)

Practical coupling device based on a two-core optical fiber

Réal Vallée and Denis Drolet
Appl. Opt. 33(24) 5602-5610 (1994)