Jean Kalkavage

Ring Resonator Delay Elements for Integrated Optical Beamforming Networks: Group Delay Ripple Analysis

The group delay ripple of cascaded optical ring resonator (ORR) delays is quantitatively studied with a genetic algorithm. Initial measurement results are also reported for a fabricated optical beam forming network chip utilizing cascaded ORRs.

Photonic downconverting link with digital linearization

We experimentally demonstrate a digitally linearized high dynamic range downconverting microwave photonic link. The system is limited in frequency only by the 10 GHz 3-dB bandwidth of the optical modulators used and is demonstrated at 9 GHz. Digital linearization suppresses third order intermodulation distortion by as much as 39 dB. The linearization is shown for a single tone, a two tone, and a 1 MHz bandwidth input signal.

Ring resonator based integrated optical beam forming network with true time delay for mmW communications

An optical ring resonator (ORR) based integrated optical beamforming network (OBFN) for a W-band millimeter wave phased array antenna is reported. The delay response of a 3-ORR delay line is optimized and dynamic tuning ranges of 208.7 ps and 172.4 ps for the true time delay bandwidths of 6.3 GHz and 8.7 GHz are achieved. Moreover, all of the delay paths are successfully tuned with 4. 2 ps delay difference from the neighboring paths. Eye diagrams of a 3 Gbps NRZ OOK modulated signal are measured to show that no noticeable signal deterioration is induced by the OBFN chip.

Recent progress in photonic analog-to-digital converters

Progress in photonic analog-to-digital conversion architectures and system design issues will be discussed taking full advantage of recent photonic, electronic and signal processing technologies. Specifically targeted will be architectures supporting operational frequencies exceeding the sampling rate as well as recent work on compressive sampling, where instantaneous bandwidths larger than the sampling rate are obtainable.

Integrated optical beamforming network for millimeter wave communications

An optical ring resonator (ORR) based 1 × 4 integrated optical beamforming network (OBFN) targeting mmW is reported. The optimized true time delay response of a 3-ORR delay line with a bandwidth of 8.7 GHz was achieved over tuning range of 172.4 ps, which corresponds to a 31π phase shift for a 90 GHz signal. A 3 Gbps OOK NRZ data signal was transmitted through the delay line to verify the overall performance. A 49° beamsteering angle equivalent OBFN delay response was achieved for a 90 GHz half-wavelength dipole antenna array. Using heterodyne upconversion technology and a single delay path, 41 GHz mmW signal with 3 Gbps OOK NRZ data modulation was generated and delayed.

Ring Resonator True Time Delay Arrays with Sharing Optimization for Wideband Applications

The delay response and sharing topology of a 3-optical-ring-resonator based optical beamforming network were experimentally studied and optimized. Eye diagrams were measured to evaluate the signal degradation imposed by the chip.