Multi-order dispersion engineering for optimal four-wave mixing

ArticleinOptics Express 16(10):7551-63 · June 2008with5 Reads
DOI: 10.1364/OE.16.007551 · Source: PubMed
Four-wave mixing in high refractive index materials, such as chalcogenide glass or semiconductors, is promising because of their large cubic nonlinearity. However, these materials tend to have normal dispersion at telecom wavelengths, preventing phase matched operation. Recent work has shown that the waveguide dispersion in strongly confining guided-wave structures can lead to anomalous dispersion, but the resulting four-wave mixing has limited bandwidth because of negative quartic dispersion. Here we first show that the negative quartic dispersion is an inevitable consequence of this dispersion engineering procedure. However, we also demonstrate that a slight change in the procedure leads to positive quartic dispersion, resulting in a superior bandwidth. We give an example in which the four-wave mixing bandwidth is doubled in this way.
    • "The observed flattening of each order of enables true multiorder dispersion engineering to facilitate the phase matching condition. Thus, parametric processes can be significantly optimized through a combination of a small negative, near zero, and a small positive neutralizing the effect of each other [11]. We also address one of the fundamental problems that high index contrast SOI waveguides exhibit, i.e., high propagation losses due to sidewall roughness. "
    [Show abstract] [Hide abstract] ABSTRACT: We propose a new technique for the multiorder dispersion engineering of nanophotonic strip waveguides. Unlike other techniques, the method does not require wafers with cus-tomized parameters and is fully compatible with standard wafers used in nanophotonics. The dispersion management is based on the application of nanometer-thick TiO layer formed by atomic layer deposition. The method is simple and reliable and allows good control of dispersion up to the fourth-order terms. The additional advantages are the reduction of propagation losses and partial compensation of fabrication tolerances.
    Full-text · Article · Aug 2012
    • "Δβ = 0) is not achieved. Various methods exist to achieve phase matching, including using birefringence and waveguide tailoring (Dimitripoulos et al., 2004; Foster et al., 2006; Lamont et al., 2008), but perhaps the simplest way is to work in a region of low dispersion. As is shown in (Agrawal, 2006), the phase mismatch term can be reduced to: and is thus directly proportional to the dispersion coefficient (note that at high power levels the phase mismatch becomes power dependant; see (Lin et al., 2008)). "
    [Show abstract] [Hide abstract] ABSTRACT: Integrated photonic technologies are rapidly becoming an important and fundamental milestone for wideband optical telecommunications. Future optical networks have several critical requirements, including low energy consumption, high efficiency, greater bandwidth and flexibility, which must be addressed in a compact form factor.
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    • "The efficiency is tightly related to the effective mode area of the waveguide and some new structures such as slot waveguides [19, 20] and surface plasmon waveguides [21] have exhibited the ability to confine light. In addition, the dispersion of the SOI waveguides has been demonstrated to be governed by its shape and dimensions [22, 23], which provides the option to realize broadband wavelength conversion by tuning the dispersion characteristics of silicon nanowire waveguides [24]. Lin et al. reported the ultra-broadband wavelength conversion by tailoring the dispersion of waveguide under the consideration of the impact of the linear loss and absorptions [25], and Liu et al. introduced a dielectric film deposited around the silicon core for dispersion engineering to achieve a broadband FWM [26]. "
    [Show abstract] [Hide abstract] ABSTRACT: The broadband wavelength conversion based on four-wave mixing in a silicon nanowire waveguide is theoretically investigated by taking into account the influence of the waveguide loss and free-carrier absorption on the phase-matched condition. The lossy wavelength conversion is compared with the lossless one in terms of conversion efficiency and bandwidth. The size of the silicon-on-insulator nanowire waveguide is optimized to be 400 nm × 269 nm for broadband wavelength conversion by realizing a flattened dispersion. The pump wavelength is also optimized to 1538.7 nm in order to further enhance the conversion bandwidth. A 3-dB conversion bandwidth of over 280 nm is achieved in the optimized waveguide with the optimized pump wavelength.
    Article · Jan 2009
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