Patent ID: 11862923
Assignee: LUMENTUM OPERATIONS LLC
Field: Optics (Instruments)
Classification: CPC H  G | IPC G  H

Claim 8:
9. An optical system, comprising:
a first optical device having a core to carry core light and a cladding, surrounding the core, to carry high-power cladding light;
a second optical device having a core to carry core light and a cladding, surrounding the core, to carry high-power cladding light, wherein the core of the first optical device and the core of the second optical device have different fundamental mode fields; and
a mode field adapter coupled between the first optical device and the second optical device, wherein the mode field adapter comprises:
an input fiber having a core and a cladding, surrounding the core of the input fiber, with a diameter that decreases adiabatically, wherein the cladding surrounding the core of the first optical device is adiabatically etched such that a ratio between the core of the first optical device and the cladding surrounding the core changes over a length of the first optical device; and
an output fiber having a core and a cladding, surrounding the core of the output fiber, with a diameter that matches the diameter of the cladding of the input fiber at a waist of the output fiber,
wherein a core fundamental mode of the input fiber matches a core fundamental mode of the output fiber at the waist of the output fiber,
wherein the diameter of the cladding of the output fiber increases adiabatically, and
wherein the core and the cladding surrounding the core of the second optical device are adiabatically tapered such that a ratio between the core of the second optical device and the cladding surrounding the core of the second optical device is constant over a length of the second optical device.