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US 11,855,416 B2Granted
External-cavity laser with reduced frequency noise
AssigneeFiber Sense Limited
InventorGideon Yoffe
Life of this patent
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Abstract
A laser for a distributed fiber sensing system may have a frequency discriminator integrated with the laser. The laser may be an external cavity laser, with at least a portion of the laser cavity on a planar lightwave circuit, which also includes the frequency discriminator.
Claims13
A laser device with a frequency discriminator for a distributed fiber sensing system, comprising:
- a laser element for generating light and a planar lightwave circuit (PLC) optically coupled to the laser element so as to receive light from the laser element, the PLC including a frequency discriminator component;
- wherein the frequency discriminator component comprises a Mach-Zehnder interferometer with asymmetric arm lengths and a phase shifter in at least one arm of the Mach-Zehnder interferometer;
- and
- wherein the laser element is part of an external cavity laser, and the PLC includes a wavelength selective component optically coupled to the laser element, so as to provide wavelength selective feedback to the laser element.
1 more element
A laser device with a frequency discriminator for a distributed fiber sensing system, comprising:
- a laser element for generating light;
- and
- a planar lightwave circuit (PLC) optically coupled to the laser element so as to receive light from the laser element, the PLC including a frequency discriminator component;
- wherein the laser element is part of an external cavity laser, and the PLC includes a wavelength selective component optically coupled to the laser element, so as to provide wavelength selective feedback to the laser element;
- and
- wherein the wavelength selective component comprises a waveguide with perturbations along at least part of a length of the waveguide.
3 more elements
A laser device with a frequency discriminator for a distributed fiber sensing system, comprising:
- a laser element for generating light and a planar lightwave circuit (PLC) optically coupled to the laser element so as to receive light from the laser element, the PLC including a frequency discriminator component;
- wherein the laser element is part of an external cavity laser, and the PLC includes a wavelength selective component optically coupled to the laser element, so as to provide wavelength selective feedback to the laser element;
- and
- wherein the wavelength selective component comprises a waveguide with islands of waveguide material on at least one side of the waveguide along at least part of a length of the waveguide.
1 more element
Dependencies are inferred from the claim text.