Terahertz Generation in an Electrically Biased Optical Fiber: A Theoretical Investigation
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This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. We propose and theoretically investigate a novel approach for generating terahertz (THz) radiation in a standard single-mode ﬁber. The optical ﬁber is mediated by an electrostatic ﬁeld, which induces an eﬀective second-order nonlinear susceptibility via the Kerr eﬀect. The THz generation is based on diﬀerence frequency generation (DFG). A dispersive ﬁber Bragg grating (FBG) is utilized to phase match the two interacting optical carriers. A ring resonator is utilized to boost the optical intensities in the biased optical ﬁber. A mathematical model is developed which is supported by a numerical analysis and simulations. It is shown that a wide spectrum of a tunable THz radiation can be generated, providing a proper design of the FBG and the optical carriers .