Design and analysis of a refractive index sensor based on dual-core large-mode-area fiber

作者：Kamakshi Koppole^*; Rastogi Vipul; Kumar Ajeet

来源：Optical Fiber Technology, 2013, 19(4): 325-329.

DOI：10.1016/j.yofte.2013.03.007

• Refractive index sensor
• Large-mode-area fiber
• Leakage loss
• Dual-core fiber
• Resonant coupling

We present a novel co-axial dual core large-mode-area (LMA) fiber design for refractive index sensing. In a dual-core fiber there is resonant coupling between the two cores, which is strongly affected by the refractive index (RI) of the outermost region. The transmittance of the fiber, therefore, varies sharply with the refractive index of surrounding medium. This characteristic of the proposed structure has been utilized to design a RI sensor. We have analyzed the structure by using the transfer matrix method. Our numerical results show that the proposed sensor is highly sensitive with the resolution of 2.0 x 10(-6) around n(ex) = 1.44376. Effect of design parameters on sensitivity of the proposed sensor has also been investigated.

• 出版日期2013-8