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Ring-core optical fibers have been designed to carry orbital angular momentummodes. We demonstrate the imaging of these modes, individually identifyingmodes separated temporally by only 30~ps. A single-pixel camera operating inthe short-wave infrared detection range is used to image the 1550~nm wavelengthoptical modes. With this technique, examination of these optical modes can beperformed with significantly higher temporal resolution than is possible withconventional imaging systems, such that the imaging of modes separated byspin-orbit coupling is achieved and evaluated. Deconvolution is required toseparate the instrument response from the optical mode signal, increasing theclarity and temporal resolution of the measurement system.

Direct observation of the spin-orbit coupling interaction in ring-core optical fibers