Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 38, Issue 16, Pages 4497-4503Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.2987328
Keywords
Grapefruit-type fiber; holey fiber; ring-core fiber; OAM modes multiplexing transmission
Funding
- National Key R&D Program of China [2019YFA0706300]
- Ministry of Science and Technology, China
- National Natural Science Foundation of China [U1701661]
- State Key Laboratory of Advanced Optical Communication Systems Networks China
Ask authors/readers for more resources
We propose a bend-insensitive grapefruit-type holey ring-core fiber to support orbital angular momentum (OAM) modes. The large air domain in the cladding, results in a large refractive index contrast between the ring-core and the cladding, which makes this fiber bend-insensitive and makes the vector eigen-modes well separated. Therefore, the proposed fiber can be adopted for the OAM mode division multiplexing transmission without the use of any multiple-input multiple-output digital signal processing (MIMO-DSP). It is also proved that the thickness of the outer silica layer around the ring-core plays an important role in confining the light. If the OAM modes in the ring-core and the cladding modes in the outer silica layer are not phase-matched, the OAM modes in the ring-core will not be coupled into the outer layer of silica and can be well confined. We fabricate such fiber in two steps by using the stack-and-draw method. Two kinds of fibers with different thicknesses of the outer silica layer are fabricated under different pressures and temperatures. The testing results of the fabricated fiber demonstrate the mode purity and illustrate that the loss of the OAM(+1,1) and OAM(+2,1) modes are 0.095 dB/m and 0.25 dB/m, respectively.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available