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Updated: Feb 13, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Orientation-insensitive azimuthally asymmetric mode rotator using chirally-coupled-core fiber
Abstract:
We propose orientation-insensitive azimuthally asymmetric mode rotators (OI-AAMR) using chirally-coupled-core fiber. The proposed mode rotator can convert azimuthally asymmetric mode to the orthogonal degenerate mode without the requirement for angle alignment. An LP11 mode rotator with a rotation efficiency and an extinction ratio as high as 97% and 17 dB over C-band respectively, has been successfully demonstrated for any incident lobe orientation for the first time to the best of our knowledge. Owing to its circular center core structure, low insertion loss and crosstalk at the connection with few-mode fibers (FMF) can be expected. The proposed OI-AAMR has good scalability to higher-order modes and a mode rotator for LP21 mode has been demonstrated as an example. The proposed mode rotators are promising for mode rotating applications in mode division multiplexing transmission.
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