Design for a Single-Polarization Photonic Crystal Fiber Wavelength Splitter Based on Hybrid-Surface Plasmon Resonance

Abstract

A novel single-polarization photonic crystal fiber wavelength splitter based on hybrid-surface plasmon resonance is proposed. A full-vector finite-element method is applied to analyze the guiding properties. Numerical simulations show that the proposed splitter, which is only several hundred microns in length, gives single polarization in the 1.31-m and 1.55-m bands. The loss of the unwanted polarized mode is 102.6 and 245.0 dB/cm in the two aforementioned communication windows, respectively, and the corresponding insertion loss is as low as 3.5 and 1.7 dB/cm, respectively. Moreover, the dependence of the bandwidth on the fiber length is given, and according to that function, the bandwidth can reach 40 nm (1.31-m band) and 100 nm (1.55-m band) when the fiber length is up to 1 mm. Additionally, the tolerances for a realistic fabrication are analyzed. In the last part, we discuss other methods to deal with an anticrossing phenomenon in detail.

Design and fabrication of copper-filled photonic crystal fiber based polarization filters

“…Cross talk is one of the key elements used to control and limit the undesirable polarized modes during the fabrication of a polarization filter. Cross talk also characterizes the quality of transmission by defining its ability to eliminate the undesirable polarized mode [17]. The cross talk is developed by Beer-Lambert laws [29] in which it can be simplified as a function of the fiber length as given in Eq.…”

“…The PWDT property is caused by the surface plasmon polariton (SPP), which is excited at the metal-dielectric interface due to the stimulation of light. Consequently, this phenomenon has already been studied in many potential applications including polarizers [16][17][18][19][20], sensors [4,6,21], and in-fiber devices [2,5,22].…”

“…The authors observed the PWDT characteristic from the SPP resonance of the Au nanowire and the fiber core. There are a number of numerical studies on the polarization characteristics of metal-filled PCF that have been reported recently [8,[15][16][17][18][19][20][21]24,[27][28][29]. On the other hand, Xue et al in 2013 reported a polarization filter of Au-coated PCF and claimed that the resonance loss at 1311 nm wavelength was 508 dB/cm in y-polarization.…”

Polarization filtering in the visible wavelength range using surface plasmon resonance and a sunflower-type photonic quasi-crystal fiber

“…There are two methods to separate the resonance wavelengths for the two orthogonal polarized modes. The first method uses elliptic air-holes [31], a small air-hole [34] or a D-type structure [35] to obtain birefringence of the coremode. In other words, this method separates the effective indices of the two polarized modes of the core.…”

“…At the metal/silica interface, surface plasmon resonance (SPR) can occur under specific circumstances [27,28]. Using SPR, new types of PCF sensors [26,29], wavelength splitters [30,31], and polarization filters [32][33][34][35][36][37][38] could be designed and demonstrated. For typical polarization filters, although several advantages have been theoretically explored, their performance still needs to be further enhanced due to the inseparable coupling between the x-and y-polarized modes [32] and the neglected coupling effect that occurs at the gold/liquid interface [33].…”