Using optical modulators and closed-loop phase control have enabled new techniques, wherein signals in the microwave and millimeter-wave spectrum are converted to the optical domain, where they are subsequently spatially processed using conventional optical components enabling applciations from passive millimeter-wave imaging to multi-beam broadband receivers.
A balanced P-TWPD on SOI is demonstrated for the first time. The device composed of 8 Ge photodiodes delivers powers of 8.3 dBm at 5 GHz and 2.6 dBm at 25 GHz. The internal responsivity is 0.84 A/W. The CMRR is larger than 30 dB.
An integrated optical sensor is designed and fabricated for implantable applications in monitoring the pressure and temperature within intracranial, intraocular space. The sensing mechanisms utilize Fabry-Perot interferometry and photonic crystal resonance. The containing semiconductor material and integrated polymer fiber are selected to be all bioresorbable.