Optic for multi-pass optical channel monitor
AssigneeLumentum Operations LLC
InventorPaul Colbourne
Life of this patent
Estimating the term…
Abstract
An optical device may include a dispersion element. The optical device may include a reflective optic to reflect an optical beam with a fixed offset perpendicular to a dispersion direction of the dispersion element and with a negative offset in the dispersion direction of the dispersion element. The reflective optic may be aligned to the dispersion element to offset an optical beam with respect to the dispersion element and to cause the optical beam to pass through the dispersion element on a plurality of passes, offsetting the optical beam on each of the plurality of passes.
Claims20
An optical device, comprising:
- a dispersion element;
- a reflective optic to reflect an optical beam with a fixed offset perpendicular to a dispersion direction of the dispersion element and with a negative offset in the dispersion direction of the dispersion element,
- wherein the reflective optic is aligned to the dispersion element to offset an optical beam with respect to the dispersion element and to cause the optical beam to pass through the dispersion element on a plurality of passes, offsetting the optical beam on each of the plurality of passes;
- and
- a reflective tuning element in an optical path of the dispersion element and the reflective optic.
A method, comprising:
- receiving, at an input port of an optical channel monitor, an optical beam;
- directing, by a reflective optic of the optical channel monitor, the optical beam through a dispersion element of the optical channel monitor and a reflective tuning element of the optical channel monitor for a plurality of passes, wherein each pass is offset in accordance with a fixed perpendicular offset of the reflective optic;
- and
- determining, by the optical channel monitor, a characteristic of the optical beam based on directing the optical beam through the dispersion element for the plurality of passes.
A reflective optic, comprising:
- a plurality of prism faces,
- wherein the plurality of prism faces are angled with respect to each other to cause, in an optical path, a fixed perpendicular offset in at least one optical path through the reflective optic with respect to at least one other optical path through the reflective optic,
- wherein a size of the fixed perpendicular offset is independent of an incident position of an optical beam on a prism face of the plurality of prism faces, and
- wherein the plurality of prism faces are angled with respect to each other to cause, in the at least one optical path, a spectral inversion.
Dependencies are inferred from the claim text.