To introduce an artificial “magnetic field” in our arrangement, we twisted the four-core fiber. The fiber was excited at λ = 1550 nm, with an external cavity laser with a CW output power of ~1 mW. The output intensity profile from the four cores was then recorded on a complementary metal-oxide semiconductor–based infrared beam profiling camera. Moreover, to discern different cores in the structure, we used a visible imaging camera to capture both the input and output facets of the fiber, once it was twisted. In general, for a given twisting rate (corresponding to an AB phase of ϕ), the light intensity in core #1 and core #3 is explicitly given by the expressionEmbedded Image(3)where L is the length of the four-core fiber. Figure 2 depicts these theoretical results along with experimentally observed values for different values of ϕ when L = 24 cm. As evident from Eq. 3, for the specific case of ϕ = π/4, the third core will always remain dark, irrespective of the length L, in agreement with our experimental results.

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