We present the numerical procedures involved in the design of coupler cavities for accelerator sections for linear colliders. The MAFIA code is used to simulate an X-band accelerator section with a symmetrical double-input coupler at each end. The transmission properties of the structure are calculated in the time domain and the dimensions of the coupler cavities are .&usted until the power cou...

We experimentally demonstrate a terahertz-bandwidth photonic differentiator employing a silicon-on-insulator directional coupler. The integrated waveguide coupler with two identical paralleled strip waveguides achieves a first-order differentiator when full energy coupling is met from one waveguide to another. The integrated waveguide coupler can offer different operation bandwidths by changing...

This paper presents a proposal for a novel integrated tun-able coupler device called programmable coupler ladder, based on Titanium diffused lithium niobate waveguide and Y-junction reflector. Unlike the traditional serial to parallel converter, the coupler ladder sorts the output bits in the time axis using a built-in delay waveguide. With a proper control signal it can perform signal processi...

Recent experience with X-band accelerator structure development has shown the rf input coupler to be the region most prone to rf breakdown and degradation, effectively limiting the operating gradient. A major factor in this appears to be high magnetic fields at the sharp edges of the coupling irises. As a first response to this problem, couplers with rounded and thickened iris horns have been e...

Coupled climate models are large, multiphysics applications designed to simulate the Earth’s climate and predict the response of the climate to any changes in the forcing or boundary conditions. The Community Climate System Model (CCSM) is a widely used state-of-the-art climate model that has released several versions to the climate community over the past ten years. Like many climate models, C...

A 120o optical hybrid based on 3x3 multimode interference coupler is reported. The device exhibits less than 10o phase deviation over 55 nm in the Cand L-band. Keywords—120-degree hybrid; multimode interference coupler;

We report a 1.04 GHz high-power Kerr-lens mode-locked Yb:CaYAlO 4 laser pumped by single-mode fiber at 976 nm. Based on bow-tie cavity, stable unidirectional operation is obtained with an output coupler of 1.6%. The oscillator delivers pulses average power 1.46 W and the pulse duration 99 fs, which, to best our knowledge, first gigahertz-level based gain medium. believe that watt-level solid-st...

A simple waveguide directional coupler is described which uses the split-block type of construction common in millimeter-wave components. The coupler uses an array of metal probes suspended on quartz stand-offs. Depending on the number of coupling elements, the coupling can be in the range 15-30 dB, with typically ± 2 dB variation across the waveguide band, and directivity > 10 dB. The coupler,...

This paper proposes a reflection-type wideband 360 ° analogue phase shifter. The phase shifter employs a branchline coupler circuit to achieve a wideband operation and a varactor-diode circuit to achieve a wide phase-shift range. Analytical formulas are derived to optimize the parameters in the coupler circuit for wideband operation and reduced attenuation ripple, and in the varactor circuit to...

In this letter, a 60GHz tandem coupler using offset broadside-coupled lines is proposed on a silicon-based integrated passive device technology. Over the frequency band of 57–66GHz, the measured insertion loss, amplitude imbalance, input return loss, isolation and phase error of the designed tandem coupler are better than 0.67 dB, 0.31 dB, 27.9 dB, 29.7 dB and 3.7◦ respectively. To the best of ...