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.
Millimeter-wave long-wavelength integrated optical receivers grown on GaAs
Compact monolithically integrated narrow-band photoreceivers with a high responsivity at millimeter-wave frequencies were realized. In these receivers, a 1.3-1.55-/spl mu/m wavelength In/sub 0.53/Ga/sub 0.47/As p-i-n photodiode, grown lattice relaxed on GaAs, is conjugately matched to a two-stage narrow-band amplifier based on 0.15-/spl mu/m GaAs based dual-gate PHEMTs. A first receiver, designed for operation around 42 GHz, obtains an optical responsivity of 7 A/W. This is a 38-dB increase in comparison with the measured responsivity of a terminated p-i-n photodiode. For a second receiver, operating at 58 GHz, a responsivity of 2.5 A/W is obtained. These receivers are, to our knowledge, the first high-gain millimeter-wave long-wavelength photoreceivers monolithically integrated on GaAs. Their high responsivity makes them attractive for use in various microwave and millimeter-wave-over-fiber applications.
Reactively matched optoelectronic transceivers on InP substrate for 6 GHz operation
The monolithic integration of optoelectronic devices with microwave impedance matching networks is presented. These are a GaInAs photodiodes and a GaInAsP buried ridge stripe structure laser emitting at 1.3 mu m; both are fabricated on semi-insulating InP substrate. The matching networks, consisting of reactive components, have been designed to match these devices to 50 Omega at 6 GHz with a bandwidth close to 10%. Compared to an unmatched link, an improvement of 12 dB at 6 GHz is theoretically obtained; experimentally, it has been measured to 11.4 dB at 5.6 GHz.<<ETX>>