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Several parallel inserts may be used in the same length of waveguide.
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In waveguide, this device is simply a short length of waveguide.
This consists of a short length of waveguide blocked at both ends.
Typically, an evanescent mode filter consists of a length of waveguide smaller than the waveguide feeding the input and output ports.
A stub is a short length of waveguide connected to some point in the filter at one end and short-circuited at the other end.
It is used to couple together two lengths of waveguide and is a means of introducing a discontinuity.
It is shown that the efficiency decreases considerably even for the low-loss waveguide compared to the lossless one especially for long waveguides and to achieve the higher efficiency for the same length, the amount of the extra power to compensate the loss increases.
The results show that if symmetric rib waveguide is replaced by asymmetric rib waveguide, the length of branch waveguide could be reduced by 30% under the same conditions of transmission loss.
These parameters include the thickness and width of the guide core, mode effective refractive indices and group refractive index, diffraction order, pitch of adjacent waveguides, length difference of adjacent arrayed waveguides, focal length of slab waveguides, free spectral range (FSR), the number of input/output (I/O) channels, and that of arrayed waveguides.
Thus, by changing widths and lengths of waveguides, and the gaps between adjacent waveguides, specific frequencies can be selected with special designed structures.
b Cut-back method result: transmittance measured at the output of the waveguide as a function of the length of the waveguide (blue circles) and a linear fit (red solid line).
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