Hybrid single-mode and multimode optical fiber

摘要

A hybrid optical fiber integrates features of multimode optical fibers and single-mode optical fibers. The hybrid optical fiber possesses an optical core having a first core region and a second core region to provide improved optical mode coupling ratio for single-mode transmission while maintaining a broad bandwidth for multimode transmission. The hybrid optical fiber's optical core may optionally include a depressed trench positioned between the optical core's first core region and the optical core's second core region to reduce modal dispersion and to improve modal bandwidth during multimode transmissions.

主权项

1. An optical system, comprising:
a hybrid optical fiber connected to a single-mode optical fiber, wherein, during transmissions at a wavelength of 1550 nanometers, at least 98 percent of the power of the single-mode optical fiber's fundamental mode is coupled into the hybrid optical fiber's fundamental mode; wherein the hybrid optical fiber comprises: an optical core including (i) a first core region having a radius as of between 1.5 microns and 9 microns, and (ii) a second core region contiguously surrounding the first core region, the second core region having a radius a of at least 15 microns; an optical cladding surrounding the optical core; wherein the optical core's first and second core regions are such that the optical core has a refractive index profile n(r) defined by the following equation:n⁡(r)={n0·1-2·Δ·(ra)α+Δsr