Optical fiber filter
AssigneeFujikura Ltd.
InventorsSatoshi Okude, Tetsuya Sakai, Akira Wada, Ryozo Yamauchi
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Abstract
The present invention relates to an optical fiber filter provided with a portion which selectively reflects or transmits light of a specific wavelength, this portion comprised of a multimode optical fiber in which the refractive index of the core changes periodically along the longitudinal direction thereof. Furthermore, this multimode optical fiber has an input end and an output end, with at least the input end of the multimode optical fiber being connected to a single mode optical fiber. As a result of forming an optical fiber filter in this way, it is possible to realize an optical fiber filter that exhibits no transmission loss at wavelengths other than the center wavelength.
Claims22
An optical fiber filter having a portion which selectively reflects or transmits light of a specific wavelength, wherein:
- the portion for selectively reflecting or transmitting light of a specific wavelength is comprised of a multimode optical fiber in which the refractive index of the core changes periodically along the longitudinal direction thereof;
- the multimode optical fiber having an input end and an output end, wherein at least the input end of the multimode optical fiber is connected to a single mode optical fiber.
An optical fiber filter having a portion for selectively reflecting or transmitting light of a specific wavelength, wherein:
- the portion for selectively reflecting or transmitting light of a specific wavelength comprises a multimode optical fiber in which the refractive index of the core changes periodically along the longitudinal direction thereof;
- the multimode optical fiber having an input end and an output end, wherein at least the input end of the multimode optical fiber is connected to an external single mode optical fiber or an external single mode optical waveguide.
Dependencies are inferred from the claim text.