Calculation of the mode coupling coefficient in step-index plastic optical fibers based on the far field measurements
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2022-05-25Аутори
Savović, Svetislav
Djordjevich, Alexandar
Drljača, Branko
Simović, Ana
Min, Rui
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Using the power flow equation (PFE), this article investigates mode coupling in step-index
(SI) multimode (MM) polymer optical fiber (POF). This equation’s coupling coefficient was
initially fine-tuned so that it could appropriately reconstruct previously recorded far-field
(FF) power distributions. The equilibrium mode distribution (EMD) and steady-state
distribution (SSD) in the SI MM POF were found to be obtained at lengths Lc = 15 m
and zs = 41 m, respectively. These lengths are substantially shorter than their glass optical
fiber counterparts. Such characterization of the investigated POF can be used in its
employment as a part of the communication or sensory system. Namely, the POF’s
bandwidth is inverse linear function of fiber length (z
−1
) below the coupling length Lc.
However, it has a z
−1/2 dependence beyond this equilibrium length. Thus, the shorter the
coupling length Lc, the sooner transition to the regime of slower bandwidth decrease
occurs. It is also important to be able to determine a modal distribution at a certain length of
the POF employed as a part of optical fiber sensory system.
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