Photodetection device and laser device
AssigneeFujikura Ltd.
InventorsShinichi Sakamoto, Wataru Kiyoyama
Life of this patent
Estimating the term…
Abstract
A photodetection device including: first optical fibers; a second optical fiber; an optical combiner having: an end face connected to an end face of each of the first optical fibers; and another end face connected to an end face of the second optical fiber; a first photodetector that detects an intensity of light propagating through at least one of the first optical fibers; a second photodetector that detects Rayleigh scattering of light propagating through the second optical fiber; and a calculator that calculates the intensity of light propagating in a predetermined direction through the first optical fibers or the second optical fiber, from a result of detection by the first photodetector and a result of detection by the second photodetector.
Claims5
A photodetection device comprising:
- first optical fibers;
- a second optical fiber;
- an optical combiner having:
- an end face connected to an end face of each of the first optical fibers;
- and
- another end face connected to an end face of the second optical fiber;
- a first photodetector that detects an intensity of light propagating through at least one of the first optical fibers;
- a second photodetector that detects Rayleigh scattering of light propagating through the second optical fiber;
- and
- a calculator that calculates the intensity of light propagating in a predetermined direction through the first optical fibers or the second optical fiber, from a result of detection by the first photodetector and a result of detection by the second photodetector,
- wherein
- some, but not all, of the first optical fibers each have another end face that is optically coupled to a light source, and
- the first photodetector detects the intensity of the light propagating through the first optical fibers that are not optically coupled to the light source.
Dependencies are inferred from the claim text.