Patent ID: 11916348
Assignee: HUAWEI TECHNOLOGIES CANADA CO., LTD.
Field: Optics (Instruments)
Classification: CPC H  G | IPC G  H

Claim 9:
10. 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.