A new RF-photonic transversal filter based on wavelength division multiplexed (WDM) technologies is reported. The tap-amplitudes of the bandpass filter were designed to be antisymmetric and arbitrarily reconfigurable. For 20-tap filters centred at 4.8 GHz, a sidelobe suppression of >30 dB, passband widths <470 MHz, and a linear insertion phase are demonstrated.

Recently, there has been great interest in the application of photonic sampling to help achieve analog-to-digital conversion (A/D) with high resolution at multi-GHz sampling rates (f/sub s/). Conceptually, the low-jitter picosecond pulses generated by a mode-locked laser are ideal vehicles that would enable one to accomplish impulse sampling of an analog signal. To this end we have developed a 4-bit 20 Gsample/s flash analog-to digital converter in InP HBT technology with monolithically integrated optical signal and optical clock receivers.

Conceptually, picosecond pulses generated by a mode-locked (ML) laser are ideal vehicles that can help achieve accurate impulse sampling of an analog signal. As illustrated an electro-optic modulator can be used to impress the analog input onto the optical pulse train. After photodetection, the received signal due to the modulated pulse train is sent, in turn, to an electronic quantizer for digitization

We report single- and multi-element fibre grating coupled diode laser transmitter modules that emit at ITU-designated wavelengths. In addition, we demonstrate that they can attain a direct modulation bandwidth that is as high as 4.62 GHz. Previously, the highest speed reported for these devices was 3.5 GHz

We report the development of a compact (22 cm×14.5 cm) DFB fiber laser module designed for 2.5 Gb/sec WDM networks. In particular, our DFB fiber cavity is of a novel design that offers asymmetric power outputs (with a ratio as high as 1:0.01 mW) from its two ends. This enables us to utilize the optical power from the fiber laser efficiently by feeding the output from the low power end to a electronic feedback loop for noise-reduction

We describe the design of single frequency array transmitters and their application in RF-photonic systems. In addition, we present an array-based packaging technology that is based on passive-alignment with Si-waferboards.