A Simple but Accurate Method of Estimation of Far Field Pattern of Single-Mode Triangular Index Fiber

Chebyshev series expression for LP01 mode of triangular r.i. profile fiber is used for formulating expression of far field pattern associated with it. The prescribed simple formalism can be executed easily using little computation. Here, two triangular r.i. profile optical fibers having V values 3.5 and 4.0 have been used. Our results have been matching nicely with the accurate results available in literature. Accordingly, our formalism will prove useful in predicting different relevant parameters related to the far field of triangular index fiber. Further, the knowledge of far field is effective for evaluating normalized frequency (V number), radius of the core and as such the numerical aperture. The expression for far field also gives expression for the near modal field as well. Thus, our formalism will be helpful to the scientists and engineers in the domain of devices made of optical fiber.