Ultra-wideband gain-active optical fiber in S+C+L bands

Patent metadata

Field	Value
Publication number	US-2025362446-A1
Application number	US-202519292270-A
Country	US
Kind code	A1
Filing date	Aug 6, 2025
Priority date	Dec 14, 2023
Publication date	Nov 27, 2025
Grant date	—

Abstract

The present disclosure discloses an S+C+L band ultra-wideband gain-active optical fiber, including sequentially from the inner to outer layers: an inner core layer, an inner cladding layer, a core layer, a porous layer, and a cladding layer. The inner core layer is doped with Tm ions, the inner cladding layer is doped with F elements, the core layer is doped with Er ions, and the porous layer is doped with Bi, Al, and P ions. In the fiber structure, the Tm ions in the inner core layer are completely enveloped by the inner cladding layer formed by F elements, placing the Tm ions in a low phonon energy environment provided by the F elements, thereby enhancing their luminescence efficiency in the S-band.

First claim

1 . A ultra-wideband gain-active optical fiber in the S+C+L bands, comprises the following structure from the inside out: the fiber sequentially includes an inner core layer, an inner cladding layer, a core layer, a porous layer, and a cladding layer. The inner core layer is doped with Tm ions, the inner cladding layer is doped with F elements, and the core layer is doped with Er ions.

2 . The ultra-wideband gain-active optical fiber in the S+C+L bands, as described in claim 1 , wherein the presence of Bi, Al, and P ions doped into the porous layer.

3 . The gain-active optical fiber for ultra-wideband in the S+C+L bands, as described in claim 2 , comprises: Er ions doping concentration controlled within the range of 0.01 to 4 mol %; Tm ions doping concentration controlled within the range of 0.01 to 2 mol %; Bi ions doping concentration controlled within the range of 0.01 to 1.5 mol %; F ions doping concentration controlled within the range of 0.01 to 1 mol %; Al ions doping concentration controlled within the range of 0.01 to 10 mol %; P ions doping concentration controlled within the range of 0.01 to 10 mol %.

4 . The gain-active optical fiber for ultra-wideband in the S+C+L bands, as described in claim 2 , comprises: inner core layer, inner cladding layer, core layer, and porous layer forming the core of the fiber, with a core diameter of 4 to 25 μm, and a cladding diameter of 70 to 250 μm.

5 . The gain-active optical fiber for ultra-wideband in the S+C+L bands, as described in claim 4 , comprises: refractive index difference between core and cladding in the range of 0.002 to 0.05.

6 . The gain-active optical fiber for ultra-wideband in the S+C+L bands, as described in claim 3 , comprises: the absorption wavelength range of the optical fiber is 450˜1625 nm; the emission wavelength range is 1260˜1650 nm; the wavelength range with gain greater than 20 dB is 1460˜1625 nm, and noise figure consistently below 5 dB.

7 . The gain-active optical fiber for ultra-wideband in the S+C+L bands, as described in claim 4 , comprises: the absorption wavelength range of the optical fiber is 450˜1625 nm; the emission wavelength range is 1260˜1650 nm; the wavelength range with gain greater than 20 dB is 1460˜1625 nm, and noise figure consistently below 5 dB.

8 . The gain-active optical fiber for ultra-wideband in the S+C+L bands, as described in 5 , comprises: the absorption wavelength range of the optical fiber is 450˜1625 nm; the emission wavelength range is 1260˜1650 nm; the wavelength range with gain greater than 20 dB is 1460˜1625 nm, and noise figure consistently below 5 dB.

Assignees

• Univ Shanghai

Inventors

• Wang Tingyun
• Dong Yanhua
• Wen Jianxiang
• Liu Hongyu

Classifications

• H01S3/1608

  erbium · CPC title

• H01S3/06733 Primary

  Fibre having more than one cladding · CPC title

• G02B2207/107

  Porous materials, e.g. for reducing the refractive index · CPC title

• G02B6/02361

  Longitudinal structures forming multiple layers around the core, e.g. arranged in multiple rings with each ring having longitudinal elements at substantially the same radial distance from the core, having rotational symmetry about the fibre axis · CPC title

• G02B6/02357

  Property of longitudinal structures or background material varies radially and/or azimuthally in the cladding, e.g. size, spacing, periodicity, shape, refractive index, graded index, quasiperiodic, quasicrystals · CPC title