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:
Feb. 23, 2021
Filed:
Jan. 27, 2017
Spi Lasers Uk Limited, Hedge End, GB;
Michael Kevan Durkin, Bitterne Park, GB;
SPI Lasers UK Limited, Hedge End, GB;
Abstract
Apparatus for optical isolation, which apparatus comprises a laser (), a beam delivery system (), and an output port (), wherein: the beam delivery system () comprises an optical isolator () and an optical fibre (); the laser () is defined by a peak power (); the laser () emits laser radiation () at a signal wavelength (); the laser radiation () is coupled from the laser () to the output port () via the beam delivery system (); and the optical fibre () comprises an optical waveguide () defined by a core (), a cladding (), a mode field area () at the signal wavelength (), a length (), and a Raman wavelength (); and the apparatus being characterised in that: the Raman wavelength () is longer than the signal wavelength (); the beam delivery system () attenuates the laser radiation () at the signal wavelength () such that the power of the laser radiation () emitted by the laser () is more than the power of the laser radiation () at the output port (); the apparatus does not include a pump for pumping the laser radiation () at the signal wavelength () as the laser radiation () propagates along the optical fibre (); the optical isolator () has greater backward optical isolation () and greater forward transmission () at the signal wavelength () compared to the Raman wavelength (); and the optical fibre () comprises a suppressing means () for suppressing stimulated Raman scattering.