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Multichannel optical add–drop multiplexers (OADMs) based on cascaded Bragg grating/Mach–Zehnder interferometers in silicon-on-insulator are reported. The OADMs are fabricated using electron beam lithography with a single etch. Three add–drop channels at wavelengths of 1542.5, 1557.0, and 1570.4 nm, each with a 3 dB bandwidth (BW) of 4 nm are obtained. All channels exhibit a transmission isolation...
Narrowband filters based on Bragg gratings (BGs) in subwavelength grating (SWG) waveguides in silicon-on-insulator are reported. The SWG BGs are fabricated using electron beam lithography with a single etch. For SWG BGs 1.12 mm in length, the measured 3 dB bandwidths are ∼0.5 nm, and they have a peak reflectivity as high as 94.4% in the C-band.
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