The design of a phase shifter with minimum device length that could be easily integrated into the isolator is investigated in this work. A twin-rib-waveguide nonreciprocal phase shifter having composite magnetic garnet film is characterized here using the spectral-index method. The proposed phase shifter has a device length of 22.54 mm at 1.3 μm wavelength, which is the length of the entire isolator.
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Arokiaswami Alphones (2000) studied this question.
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