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We fabricated a specially designed polymer long-periodwaveguide grating to demonstrate the phenomenon of dual resonance arising from light coupling between the core mode and a low-ordercladding mode of the waveguide. By varying the temperature of the grating, we observed the onset and the evolution of the dual-resonancewavelengths. The separation between the dual-resonancewavelengths was varied by ∼110 nm with a temperature variation of ∼10 °C. The experimental results are explained well by the simulation results. [ABSTRACT FROM AUTHOR]

We report the design and simulation performance of a digital push–pull switch based on a wide-angle, asymmetric X-junction that we recently proposed (truncated-structural X-branch). At a full-branching angle of 1.2°, the crosstalk and (straight-port) transmission at the zero-voltage state were -19 and -0.92 dB, respectively. In the switched state, they are -17.45 and -1.06 dB, respectively. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 30: 208–211, 2001. [ABSTRACT FROM AUTHOR]

We report here in detail the WDM performance of a wide-angle novel X-junction switch (TSXB) that we developed earlier. At a full branching angle of 1.5°, our new design achieves a bandwidth of 145 nm (1470–1615 nm) at 1.5 dB over which the crosstalk is kept below -18.0 dB. Maintaining the same order of bandwidth in normal X-junctions (NXB) requires a branching angle as narrow as 0.2°. A TSXB is thus suitable for WDM systems, yet comes in a size significantly more wide angle (and hence more compact) than an NXB. © 2001 John Wiley & Sons, Inc. Microwave Opt Technol Lett 28: 423–426, 2001. [ABSTRACT FROM AUTHOR]

We present a simulation of the temperature sensitivity of the resonance wavelength of a long-period waveguide grating (LPWG). We find that the temperature sensitivity of an LPWG in a channel waveguide is proportional to a modal dispersion factor that depends sensitively on the size of the core of the waveguide. Measurements with experimental polymer LPWGs agree well with the simulation results. The dimension of the waveguide core is an effective parameter for the control of the thermal characteristics of an LPWG in a channel waveguide. [ABSTRACT FROM AUTHOR]