The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 28, 2026
Filed:
Feb. 21, 2023
Exfo Optics, Sas, Lannion, FR;
Alain Mugnier, Penvénan, FR;
EXFO Optics, SAS, Lannion, FR;
Abstract
There is provided a tunable external-cavity laser and a tunable laser source based on such tunable external-cavity laser. The tunable external-cavity laser comprises: two reflective surfaces to form a laser cavity therebetween; an active waveguide for amplifying laser light propagating in the laser cavity; a tunable wavelength-selective filter within the laser cavity for selecting the emission wavelength of the tunable external-cavity laser with in a tuning range; and a collimating lens system for collimating the optical beam out of the active waveguide for propagation in the laser cavity. The collimating lens system comprises an imaging lens and a collimating lens for collimating the optical beam. The imaging lens induces a positive chromatism within the tuning range and the collimating lens comprises a complex lens inducing a negative chromatism within the tuning range so as to at least partially compensate for the positive chromatism induced by the imaging lens.