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Structure of fabricated optical add-drop multiplexers.
Transmission loss spectra of the OADM and a straight waveguide (WG).
Infrared images of the device (top view) when 1520- and 1527-nm lightwaves were launched from the signal input port. Most of the optical power was output to the through port when the 1520-nm lightwave was launched (top picture), whereas most of the optical power was output to the drop-out port when the 1527-nm lightwave was launched (middle picture). The bottom pictures are enlargements of the square portions in the middle pictures.
Relation between the dropping wavelength and the grating period.
Relations between wavelength and the modal equivalent index calculated with a mode solver (line) and estimated experimentally (squares).
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