There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Microwave photonics, which brings together the worlds of radiofrequency engineering and optoelectronics, has attracted great interest from both the research community and the commercial sector over the past 30 years and is set to have a bright future. The technology makes it possible to have functions in microwave systems that are complex or even not directly possible in the radiofrequency domain and also creates new opportunities for telecommunication networks. Here we introduce the technology to the photonics community and summarize recent research and important applications.

Microwave photonics combines two worlds

Course Description This is an advanced course in which we explore the field of Statistical Optics. Topics covered include such subjects as the statistical properties of natural (thermal) and laser light, spatial and temporal coherence, effects of partial coherence on optical imaging instruments, effects on imaging due to randomly inhomogeneous media, and a statistical treatment of the detection of light. Development of this more comprehensive model of the behavior of light draws upon the use of tools traditionally available to the electrical engineer, such as linear system theory and the theory of stochastic processes.

http://ieeexplore.ieee.org/iel5/3/23094/01073023.pdf

Statistical optics

Broadband and low loss capability of photonics has led to an ever-increasing interest in its use for the generation, processing, control and distribution of microwave and millimeter-wave signals for applications such as broadband wireless access networks, sensor networks, radar, satellite communitarians, instrumentation and warfare systems. In this tutorial, techniques developed in the last few years in microwave photonics are reviewed with an emphasis on the systems architectures for photonic generation and processing of microwave signals, photonic true-time delay beamforming, radio-over-fiber systems, and photonic analog-to-digital conversion. Challenges in system implementation for practical applications and new areas of research in microwave photonics are also discussed.

Microwave Photonics

A new tuneable high-resolution microwave photonic bandpass filter without coherent interference limitations, is presented. It is based on a wavelength dependent delay line incorporated into a frequency shifting amplified recirculating delay line structure. The tuning operation is obtained by changing the optical source wavelength, which alters the delay line loop length. Experimental results are presented for the novel structure, which demonstrate tuneable high-resolution microwave photonic bandpass filtering with a Q of 150, and with no coherence and phase-induced intensity noise limitations.

http://ieeexplore.ieee.org/iel5/5606055/5614756/05616691.pdf

Tuneable high-Q microwave photonic bandpass filter without coherent interference limitations

A new, accurate noise analysis method for optical receivers is presented. It is based on the noise figure concept of two-port networks and utilises directly available device noise parameters. The general noise matching network requirements are obtained for minimum receiver noise current. A synthesis procedure for low-noise broadband optical receivers is described which can closely satisfy the matching network requirements. Experimental results are presented for a band pass tuned PIN-HEMT optical receiver with a measured transimpedance gain of 46 dBΩ with a variation of less that ± 0.8 dB and a measured average noise current of 4.9 pA/√Hz over the frequency range from 1.7 GHz to 6 GHz

Low-noise optical receiver network synthesis using general noise figure concepts

We report a new mcirowave photonic filter that offers continously tunable true time delays, based on the concept of fractional delay lines. Proof of concept experiments demosntrate a 10-tap microwave photonic fractional delay filter. (2 pages)

Microwave photonic filter based on fractional delay lines

Advances in microwave photonic signal processing for 5G and IoT are presented. Photonic signal processing offers a new powerful paradigm for processing high speed signals, due to its inherent advantages of wide bandwidth and immunity to electromagnetic interference. Recent trends are focused on realising photonic integrated circuits using silicon photonics that are compatible with CMOS electronics. Microwave photonic advances including versatile beamforming for phased array antennas, dispersion-free microwave-optical links, frequency conversion and filtering, and integrated high-resolution photonic sensors, are presented.

Advances in microwave photonic signal processing for 5G and IoT Keynote Paper

Recent new developments in spectrum sliced photonic signal processors, which address the challenges of dispersion induced distortion and noise mitigation are presented, together with a novel multi-tap filter with insensitivity to the operating optical wavelength.

/pdf/spectrum-sliced-microwave-photonic-signal-processing-1dcutty7sd.pdf

Robert A. Minasian

Papers

Tuneable high-Q microwave photonic bandpass filter without coherent interference limitations

Low-noise optical receiver network synthesis using general noise figure concepts

Microwave photonic filter based on fractional delay lines

Advances in microwave photonic signal processing for 5G and IoT Keynote Paper

Spectrum sliced microwave photonic signal processing