Polarization-maintaining highly elliptical core fiber with stress-induced birefringence
AssigneesHuawei Technologies Canada Co., Ltd., Universite Laval
InventorsAlessandro Corsi, Sophie La Rochelle, Junho Chang
Life of this patent
Estimating the term…
Abstract
An optical fiber comprises a core having an elliptical cross section and a cladding having a circular cross section. The core has an aspect ratio between 2 and 40. The core and the cladding have a common central axis with the core being enclosed by the cladding. The difference of a refractive index of the cladding to a refractive index of the core is between 1×10−2 and 1.5×10−1. A trench is located between the core and the cladding. The trench has a uniform width and encircles the core. The refractive index of the trench is lower than the refractive index of the cladding.
Claims13
An optical fiber comprising:
- a core having an elliptical cross section, the core having an aspect ratio between 2 and 40;
- and
- a cladding, having a circular cross section, enclosing the core,
- wherein a difference of a refractive index of the cladding to a refractive index of the core is between 1×10−2 and 1.5×10−1.
An optical fiber amplifier comprising:
- a first WDM coupler receiving an input signal and an output from a first pump optical source;
- an optical fiber receiving an output from the first WDM coupler, the optical fiber comprising a core having an elliptical cross section, the core having an aspect ratio between 2 and 40, and a cladding, having a circular cross section, enclosing the core, the optical fiber further comprising a trench located between the core and the cladding, the trench having a uniform width and encircling the core, a refractive index of the trench being lower than the refractive index of the cladding;
- and
- a second WDM coupler receiving the output of the optical fiber and an output of a second pump optical source, the second WDM coupler outputting an amplified optical signal.
Dependencies are inferred from the claim text.