Microwave photonics is an area that studies the generation, processing, control and transmission of microwave signals by means of photonics. In this paper, microwave photonics techniques developed in the past few years will be reviewed, with an emphasis on system architectures for microwave applications.

http://ieeexplore.ieee.org/iel5/6305327/6320324/06320333.pdf

Microwave photonics

Microwave Photonics Microwave Photonics is an interdisciplinary field that uses a coherent combination of microwave engineering and photonics to tackle problems that are usually difficult or sometimes impossible to solve using only one of these disciplines. Reduced size-weight-cost, low attenuation over a wide modulation bandwidth, high information transfer capacity, improved sensitivity and efficiency, low power consumption, immunity to electromagnetic interference are among the most important benefits of microwave photonic systems compared to conventional microwave systems.

Microwave Photonics 분야의 최근 연구 동향

The broad bandwidth and low loss offered by modern photonics have led to an ever-increasing interest in the design and implementation of photonically assisted systems for the genera- tion, processing, control and distribution of microwave signals, an area called microwave photonics. In this article, a tutorial on microwave photonics is presented with an emphasis on photonic true-time delay beamforming, radio-over-fiber and UWB-over- fiber distribution and photonic analog-to-digital conversion.

/pdf/a-tutorial-on-microwave-photonics-2cq2jshmgl.pdf

A Tutorial on Microwave Photonics

We analyze in theory, simulation, and experiment the spurious-free dynamic range (SFDR) for a radio-over-fiber system using an optical single sideband (OSSB) Mach-Zehnder modulator (MZM) that is linearized using mixed polarization. The mixed polarization OSSB MZM makes use of a dual-electrode z-cut LiNbO3 MZM, where a linear polarizer is placed in front and in behind the optical modulator, respectively. It is found that intermodulation distortion can be suppressed significantly regardless of modulation index. Thus intermodulation induced power fading and crosstalk via fiber chromatic dispersion for a given RF carrier is reduced compared to using the conventional OSSB MZM. Improvements of ~ 13 dB in SDFR is predicted in theory, simulation, and demonstrated experimentally.

Enhanced Spurious-Free Dynamic Range Using Mixed Polarization in Optical Single Sideband Mach–Zehnder Modulator

High dynamic range analog photonic links : Design and implementation

A novel dynamic dispersion compensator has been realized using MEMS microdisks with variable power-coupling ratio. The coupling is controlled by varying waveguide-disk spacing. A group velocity dispersion tuning range of 400 ps/nm has been achieved experimentally.

/pdf/dynamic-dispersion-compensator-using-mems-actuated-microdisk-4u168jmlcz.pdf

Dynamic dispersion compensator using MEMS-actuated microdisk resonators

A balanced velocity-matched distributed photodetector (VMDP) with both impedance and velocity matching has been designed and successfully fabricated. Preliminary experimental results shows that the relative intensity noise has been suppressed by 12-dB, and the signal has been enhanced by 6-dB. This was the first integration of high power and high speed balanced detectors with a slow microwave transmission line to be used in high performance RF photonic links.

/pdf/distributed-balanced-photodetectors-for-high-performance-rf-15mvvbot0t.pdf

Distributed balanced photodetectors for high performance RF photonic links

We present the design and preliminary analysis of an efficient and wide bandwidth peripheral coupled waveguide traveling-wave electroabsorption modulator (PCW-TW-EAM), which aims to decouple the optical waveguide and the microwave transmission line. The optical waveguide mode of this device is designed to closely match to a single mode fiber mode for the ease of coupling. The waveguide has presently shown an optical propagation loss of /spl sim/2dB/mm at the modulation wavelength which is essential for wide bandwidth and high modulation efficiency to be achieved in the same design. Simulations indicate that equivalent V/sub /spl pi// less than 1V over a very large bandwidth can be obtained.

https://ieeexplore.ieee.org/iel5/8599/27270/01212625.pdf

Peripheral coupled waveguide traveling-wave electroabsorption modulator

A distributed balanced photodetector with high saturation photocurrent has been experimentally demonstrated. The maximum linear DC photo-current of 33 mA/branch is equivalent to 66 mA in single-ended photodetectors. The AC linearity at high photocurrents is also investigated.

/pdf/high-power-distributed-balanced-photodetectors-with-high-4kowt8ii5n.pdf

High power distributed balanced photodetectors with high linearity

High-Performance RF-Photonic Linkusing a Balanced Electroabsorption Modulator

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