Applications of single-mode extraction from finite difference time domain data

Craddock, Ian J; Paul, DL; Railton, CJ; Fletcher, P.N.; Dean, Mike

doi:10.1049/ip-map:19990562

Cited by 10 publications

(9 citation statements)

References 1 publication

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“…This is crucially important in exciting the structure realistically. Furthermore, it enables a specialized transmission calculation to be performed which we have called the Modal S-parameter calculation [12]. Here, an overlap integral between the input mode and the fields at a plane (known as a snapshot) specified in the output waveguide are stored at each time step.…”

Section: Resultsmentioning

confidence: 99%

Calculation of losses in 2-D photonic Crystal membrane waveguides using the 3-D FDTD method

Cryan

Wong

Craddock

et al. 2005

IEEE Photon. Technol. Lett.

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Section: Resultsmentioning

confidence: 99%

Calculation of losses in 2-D photonic Crystal membrane waveguides using the 3-D FDTD method

Cryan

Wong

Craddock

et al. 2005

IEEE Photon. Technol. Lett.

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“…A number of important features have been implemented in this in-house code, which allow a detailed study of pulse propagation. First, modal excitation and mode overlap integrals [12], [13] have been implemented, which allow very accurate determination of the phase shift through the device. Second, linearly chirped pulses can be defined, which is a necessary requirement to observe pulse compression in any linear system.…”

Section: Modelingmentioning

confidence: 99%

“…The waveguide is excited by the fundamental TE mode (E x is the dominant field component) of the input photonic wire waveguide. This feature enables realistic excitation of the structure and allows overlap integrals to be performed at the output of the waveguide [12]. The transmission response of the structure is calculated by first performing a simulation with a simple straight waveguide and no PhC present in order to remove the effects of reflection from the PhC waveguide.…”

Section: Modelingmentioning

confidence: 99%

Fast-Light Based Pulse Compression in 2-D Photonic Crystal Waveguides

Cao

Cryan

et al. 2007

J. Lightwave Technol.

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Abstract-Chirped-pulse propagation close to a mini-stopband (MSB) in short photonic crystal (PhC) waveguides is studied using the 2-D finite-difference time-domain method. The group delay (GD) is calculated for different length waveguides and is shown to have a nonlinear relationship with length, implying that dispersion diagram based design approaches may not be applicable in these cases. Pulse compression is then observed directly in the time domain, and a GD-based analysis is used to explain the results. It is shown that the fast-light or negative GD region that is found within the MSB plays a more important role than pulse filtering effects, which can also induce compression. The GD analysis is then used to find the optimum length waveguide for the maximum pulse compression, and this is found to be in agreement with direct time-domain results. Finally, a different PhC waveguide structure is studied based on square holes, which results in an increased GD and, hence, increased pulse compression.

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“…The method of computing the aforementioned inner products is accomplished by a double summation of weighted stair-step and piecewise linear functions; the weights are the values of the nodal fields on the grid [10]. For example,…”

Section: Tem Detectionmentioning

confidence: 99%

“…With respect to the detection problem, these same transverse fields E ta and H ta can be used in conjunction with modal orthogonality to isolate the mode of interest from the total signal [1,10,11]. If the mode of interest is the TEM mode, then the results from orthogonality can be used to find unique terminal plane voltages and currents.…”

Section: Introductionmentioning

confidence: 99%

Excitation and Detection of Waves in the FDTD Analysis of N-Port Networks

Young¹,

Adams²

2005

PIER

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Abstract-An FDTD methodology is provided herein that allows for TEM excitation and detection of signals associated with N -port network analysis. The scheme is based upon the numerical solution of Laplace's equation in the context of the standard Yee grid. The invocation of both equivalence and orthogonality of modes principles assures that the TEM mode of interest is both exclusively excited and detected. Electric and magnetic surface currents are employed to render zero backward radiation from the source plane. Orthogonality is utilized at the terminal plane to extract the TEM mode from a multi-mode signal, provided that the spectrum of the guiding structure is discrete. The advantage of this approach is found in the placement of both the terminal and source planes -both can be placed as close to each other and to the network as necessary, thus alleviating the computational and memory burdens of the simulation. Examples pertaining to this methodology include stripline structures and the monopole strip antenna. The microstrip patch antenna is also considered to demonstrate the difficulties associated with the excitation and detection of quasi-TEM signals in the midst of radiation terms.

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Applications of single-mode extraction from finite difference time domain data

Cited by 10 publications

References 1 publication

Calculation of losses in 2-D photonic Crystal membrane waveguides using the 3-D FDTD method

Calculation of losses in 2-D photonic Crystal membrane waveguides using the 3-D FDTD method

Fast-Light Based Pulse Compression in 2-D Photonic Crystal Waveguides

Excitation and Detection of Waves in the FDTD Analysis of N-Port Networks

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