In this paper, a wideband directional coupler is proposed for high-power applications, which composed of transformer and lumped elements. The introduction the greatly improves directivity coupler. measurement results demonstrate that design has an excellent return loss (>17 dB), small insertion (<0.4 high (>22) over wide frequency band (10–350 MHz). Meanwhile, it can achieve flat coupling level...

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In this paper, a miniaturized planar rat-race coupler is proposed to achieve arbitrary power division ratio and harmonic suppression performance simultaneously. It consists of six enhanced Tshaped line sections. The T-shaped lines can be equivalent to arbitrary electrical length lines rather than the conventional λ/4 lines. The explicit design formulas are derived and the characteristic impedan...

Modern optics is a field which combines basic physics with industrial applications, especially in the domains of telecommunication and sensor development. The grating coupler, an important device of integrated optics, is proposed as a model system. It is particularly appropriate for discussing basic topics such as wave-guiding and diffraction, and can be used for demonstrating important applica...

Recently, low threshold Raman silicon lasers based on ring resonator architecture have been demonstrated. One of the key elements of the laser cavity is the directional coupler that couples both pump and signal light in and out of the ring resonator from the bus waveguide. The coupling coefficients are crucial for achieving desired laser performance. In this paper, we report design, fabrication...