Active optical vortex fiber
By designing a double-clad active fiber with a tapered longitudinal profile and low birefringence, the problems of insufficient OAM optical signal power and poor mode field contrast in the existing technology are solved, realizing high-power and stable OAM beam generation and amplification.
CN115699479BActive Publication Date: 2025-12-23AMPLICONYX OY
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Patent Information
- Application Number
- CN202080101679.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2020-06-02
- Publication Date
- 2025-12-23
- Estimated Expiration
- 2040-06-02
AI Technical Summary
Technical Problem
Existing technologies struggle to generate orbital angular momentum (OAM) optical signals with sufficient optical power and mode field contrast, leading to beam quality degradation and instability.
Method used
It employs double-clad active optical fiber with a tapered longitudinal profile, including a ring core and a multi-layer cladding structure, rare earth element doping, and a low birefringence design to ensure effective propagation and amplification of optical signals in both single-mode and multi-mode components.
Benefits of technology
It improves the average and peak power of the OAM beam, enhances mode field contrast, ensures beam stability under environmental changes, and reduces polarization distortion.
✦ Generated by Eureka AI based on patent content.
Abstract
Various exemplary embodiments relate to active optical fibers and devices using active optical fibers. An active optical fiber can include a central portion surrounded by a ring-shaped active core. The optical fiber can have a tapered longitudinal profile such that the optical fiber includes a single-mode portion and a multi-mode portion. The ring-shaped core can have a low birefringence, for example, obtained by rotating (fast-rotating) the optical fiber preform during the optical fiber manufacturing. The refractive index of the ring-shaped core can be higher than the refractive index of the central portion and the cladding(s) surrounding the ring-shaped core. The active optical fiber is capable of selectively generating or amplifying an optical mode field having orbital angular momentum (OAM). Furthermore, the optical fiber has a large mode field diameter (MFD) and is insensitive to internal heating or environmental influences.
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