Hybrid and monolithic integrated optic/millimeter-wave converters for 60 GHz radio-over-fiber systems
Hybrid as well as monolithic integrated /spl lambda/=1.55 /spl mu/m optic/millimeter-wave converters were developed and investigated experimentally based on detailed microwave simulations. Both converters working near 60 GHz showed responsitivities of about 1 A/W in good agreement with the simulations.
Low-phase-noise millimeter-wave generation at 64 GHz and data transmission using optical sideband injection locking
The 60-GHz band is proposed for the radio link frequency in broad-band cellular systems. 140-155-Mb/s transmission experiments are reported with optically generated millimeter-waves at frequencies in the 60-GHz band. By applying the sideband injection locking technique, the remotely generated millimeter-wave signals depict quartz accuracy and low phase noise <-100 dBc/Hz at offset frequencies 21 MHz.
High speed, high efficiency resonant-cavity enhanced InGaAs MSM photodetectors
Resonant-cavity-enhanced In/InGaAs metal-semiconductor-metal photodetectors designed for 1.31 /spl mu/m wavelength illumination are demonstrated. The bottom mirror microcavity consists of an InGaAlAs/InAlAs buried Bragg reflector, and the top mirror comprises the interdigitated contact metallisation and a Si/SiN/sub x/ quarter wave stack deposited on the surface. An external quantum efficiency of 77%, and a 3 dB bandwidth of 10 GHz, are achieved with an InGaAs absorber thickness of 300 nm.