Fiber-coupled diode laser and photodetector microwave packages with performance extending to 20 GHz have been developed for optical tranmission of broadband analog and digital signals. These units provide all the features expected in field-deployable hermetic modules. The laser package1 incorporates a thermoelectric heat pump, thermistor, and photodetector for laser stabilization and is operable to an ambient temperature of 60°C. Microstrip coupling from the rf port to the laser chip minimizes parasitic elements and allows either direct connection to the laser or 50-Ω impedance matching over the entire band with a minimum return loss of 10 dB. The laser is coupled to a single-mode tapered lensed fiber fly-lead with solder-fixed fiber alignment. The photodetector package utilizes a substrate-illuminated mesa-geometry InGaAs PIN photodiode which terminates the rf port of the package (Fig. 1).
© 1988 Optical Society of AmericaPDF Article