Back to results
US 11,431,149 B1Granted
Single mode laser with large optical mode size
AssigneeFreedom Photonics LLC
InventorsGordon Barbour Morrison, Milan L. Mashanovitch, Hannah Grant
Life of this patent
Estimating the term…
Abstract
A laser including a grating configured to reduce lasing threshold for a selected vertically confined mode as compared to other vertically confined modes.
Claims21
A laser comprising:
- a waveguide configured to support a vertically confined fundamental optical mode and at least one vertically confined higher order optical mode;
- an active region at a first position with respect to the waveguide;
- and
- a grating at a second position with respect to the waveguide, the first position of the active region configured to provide more gain to the at least one higher order mode and the second position of the grating configured to provide more feedback to the fundamental optical mode.
1 more element
A method for designing a laser comprising a waveguide, an active region, and a grating, the method comprising:
- providing a position of the active region and a position of the grating;
- calculating at least a vertically confined first optical mode and at least one vertically confined second optical mode supported by the waveguide for the position of the active region and the position of the grating;
- adjusting the positions of the active region and the grating such that an overlap of the first optical mode with the active region is smaller than the overlap of the second optical mode with the active region, an overlap of the first optical mode with the grating region is larger than the overlap of the second optical mode with the grating, and a first product of an overlap of the first optical mode with the grating and an overlap of the first optical mode with the active region is greater than a second product of an overlap of the at least one second optical mode with the grating and an overlap of the at least one second optical mode with the active region;
- re-calculating at least the first optical mode and the at least one second optical mode and determining perturbations of at least the first optical mode and the at least one second optical mode resulting from the adjusted positions of the active region and the grating;
- calculating a difference between the first product and the second product;
- adjusting, if the difference is less than a threshold value, the positions of the active region and the grating such that the first product is larger than the second product.
3 more elements
A laser comprising:
- a waveguide configured to support a vertically confined fundamental optical mode and at least one vertically confined higher order optical mode;
- an active region at a first position with respect to the waveguide;
- a grating at a second position with respect to the waveguide, the first position of the active region and the second position of the grating configured to reduce a first lasing threshold for the fundamental optical mode and to increase a second lasing threshold for the at least one higher order optical mode;
- and
- wherein the grating provides more overlap with the fundamental optical mode compared to higher order mode.
2 more elements
Dependencies are inferred from the claim text.