Abstract
A new wideband integrated optical frequency shifter that utilizes noncollinear guided-wave magneto-optic (MO) Bragg diffraction from magnetostatic-forward-volume waves (MSFVW) in a bismuth-doped yttrium-iron-garnet/gadolinium-gallium-garnet (YIG/GGG) waveguide, 6×10 mm2 in size, is reported. Constancy in the output angle of the frequency-shifted light beam, irrespective of the amount of frequency shift, is facilitated by synchronous tuning of the carrier frequency of the MSFVW and the bias magnetic field using an electronic synchronizer. The device operating at the optical wavelength of 1.302 μm and the carrier frequency centered at X band has demonstrated desirable characteristics including large frequency shift, very large tunable bandwidth, large dynamic range, and fast tuning speed. Specifically, bandwidths of 1.61 and 2.35 GHz and dynamic ranges of 35 and 32 dB at the center carrier frequencies of 6.035 and 11.025 GHz, respectively, and a tuning speed of 50 μs have been accomplished.
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