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

Recent new methods for photonic signal processing of wideband signals based on optical delay line structures are described, including novel coherence-free notch filters and new structures that suppress phase noise in multiple-tap optical signal processors.

Photonic signal processors

A new topology for a high-Q processor with extremely low phase noise generation is presented. It is based on a frequency-shifting loop. Results show a high-Q response with a large phase noise reduction of 41 dB.

Coherence Free High-Resolution RF Photonic Filter

A new photonic microwave phase shifter structure that can realise multiple continuous 0 to 360 degree phase shifts with independent control, is presented. It is based on controlling the amplitude and phase of the optical carrier and two anti-phase RF modulation sidebands of the wavelength division multiplexed phase modulated optical signals. The new photonic microwave phase shifter also has the ability to control the output microwave signal amplitude. It has the advantages of high frequency and wide bandwidth operation, and a simple structure. Experimental results are presented that verify the new concept.

Broadband photonic microwave phase shifters with amplitude and phase controls

The attractive use of microwave photonic (MWP) technologies brings about immense benefits to the field of optical sensing. Recent new developments in microwave photonic signal processing techniques that have high potentialities to be used in a variety of sensing applications are presented in the paper, including exploring the use of finite impulse response MWP filters for distributed sensing applications, employing single passband MWP filtering techniques to increase measurement range, and the realization of optoelectronic oscillators for enhanced sensing resolution.

Microwave photonics for high performance sensing

Photonic signal processing opens up new capabilities for directly processing signals within optical fiber with high time-bandwidth operation and high-resolution performance The approach overcomes the inherent bottlenecks caused by limited sampling speeds in conventional electrical signal processors and also has the immunity to electromagnetic interference The new development of wideband signal processing towards arbitrary RF responses is presented in the paper with an emphasis on system architectures for tunable and reconfigurable operation, high resolution performance, and all-optical complex coefficients for arbitrary signal processing

Robert A. Minasian

Papers

Photonic signal processors

Coherence Free High-Resolution RF Photonic Filter

Broadband photonic microwave phase shifters with amplitude and phase controls

Microwave photonics for high performance sensing

Microwave photonics towards arbitrary RF filtering