Ultracompact 2$\,\times\,$2 Photonic Crystal Waveguide Power Splitter Based on Self-Imaging Effect Realized by Asymmetric Interference

Design of broadband power splitters using two-mode interference in slot waveguides

“…Multimode interference has also been used in the semiconductor waveguide for SLED power improvement [29,30]. As the simplest multimode interference, two-mode interference (TMI) is widely used to construct compact power splitters [1][2][3][4][10][11][12][13]. The inset in Fig.…”

“…The interaction length of TMI (denoted as L) in the proposed PS is one order of magnitude less than that of the PS based on TMI in photonic crystal waveguides [1][2][3][4], or Bragg reflection waveguides [10,11], or periodic dielectric waveguides [12], and is almost equivalent to that of the PS based on TMI in plasmonic subwavelength waveguides [13]. The interaction length (L) of the 1 Â 2 PS based on TMI in different waveguides at working wavelength 1.55 μm are listed in Table 1.…”

“…Based on the novel optical waveguides such as photonic crystal waveguides [1][2][3][4][5][6][7][8], Bragg reflection waveguides [9][10][11], periodic dielectric waveguides [12] and plasmonic subwavelength waveguides [13][14][15], a considerable number of compact PS have been presented. Take 1 Â 2 PS as an example, they can be approximately classified into two kinds according to their working mechanisms: T/Y branch type [5][6][7][8][9]14,15] and two-mode interference (TMI) type [1][2][3][4][10][11][12][13]. In General, the former is more compact, while the optimization of their branch region is complicated [5][6][7][8][9].…”

“…In General, the former is more compact, while the optimization of their branch region is complicated [5][6][7][8][9]. The latter is simpler, while it has large interaction length of TMI [1][2][3][4][10][11][12].…”

A T-shaped 1 × 8 balanced optical power splitter based on 90° bend asymmetric vertical slot waveguides

“…The characteristics of low loss, low cost, compactness and wavelength independence are highly preferred. To date, there there have been numerous investigations carried out on OPSs, which are mostly based on the Y-branch [4][5][6], multi-mode interference (MMI) [7,8], photonic crystals [9] and sub-wavelength plasmonic waveguides [10,11].…”