Comparison of optical millimetre-wave system concepts with regard to chromatic dispersion

1995 ◽  
Vol 31 (21) ◽  
pp. 1848-1849 ◽  
Author(s):  
H. Schmuck
Keyword(s):  
Chromatic Dispersion ◽  
Wave System ◽  
Millimetre Wave

scholarly journals Analysis of Phase Noise in a Hybrid Photonic/Millimetre-Wave System for Single and Multi-Carrier Radio Applications

2020 ◽  
Vol 10 (17) ◽  
pp. 5800 ◽  
Author(s):  
Devika Dass ◽  
Sean O'Duill ◽  
Amol Delmade ◽  
Colm Browning
Keyword(s):  
Phase Noise ◽  
Satellite Communications ◽  
Wave System ◽  
Receiver Design ◽  
60 Ghz ◽  
Error Vector Magnitude ◽  
Millimetre Wave ◽  
Future Evolution ◽  
Wave Phase ◽  
Single Carrier

The future evolution of wireless networks, throughout the 5G era and beyond, will require the expansion and augmentation of millimetre-wave systems for both terrestrial and satellite communications. Photonic technologies offer a cost efficient and high bandwidth platform for millimetre-wave carrier generation and distribution, but can introduce high levels of phase noise through optical heterodyning, which is highly problematic for mobile signal waveforms. In this work, a detailed analytical model of a hybrid photonic/mm-wave system is developed and discussed. Through careful system design, the system is found to support both 5G compatible multi-carrier (OFDM) and single carrier (APSK) modulation at 60 GHz. APSK is found to offer higher tolerance mm-wave phase noise compared to OFDM, ultimately easing optical linewidth restrictions to ∼30 kHz. The model is extended to include a novel millimetre wave phase noise cancelling receiver, which is shown to significantly alleviate these restrictions even further—enabling phase noise free mm-wave operation for optical linewidths up to ∼2 MHz. Detailed analysis and discussion of this extended system lead to the establishment of a theoretical relationship between the mm-wave receiver design and the achievable system performance in terms of error vector magnitude (EVM). Excellent matching of the predicted theoretical with simulated performances is shown.

Dual band radio-over-fibre millimetre–wave system utilizing optical frequency combs

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Geethika V. Kavitha ◽  
Supriya S. Sindhu ◽  
Joseph Zacharias
Keyword(s):  
Optical Networks ◽  
Data Transmission ◽  
High Speed ◽  
Dual Band ◽  
Optical Frequency ◽  
Wave System ◽  
Millimetre Wave ◽  
Optical Frequency Combs ◽  
Frequency Combs ◽  
Radio Over Fibre

AbstractThe urge for high-speed data transmission never ends. The demand for seamless online video streaming services demands a faster data transmission rate. To fulfil the demand optical communication can be used to enhance the overall performance. The union of microwave and optical networks known as Radio-over-Fibre (RoF) technology, may be a reasonable solution for improving capacity and mobility likewise as decreasing costs within the access network. Millimetre-wave (mm-wave) signals can be utilized for multi-Gb/s transmission. But mm-wave generation in the electrical domain is less feasible. Here, the optical domain comes into play. In this paper, two mm-wave frequencies are generated using optical frequency combs (OFCs). This technique is an effective solution for the mm-wave RoF system for 5G and beyond. By simulation, the major restraints of linewidth and relative intensity noise (RIN) are explored. RIN level of −163 dB/Hz is achieved.

scholarly journals High-Resolution Radiometer for Remote Sensing of Solar Flare Activity from Low Earth Orbit Satellites

2019 ◽  
Vol 1 (1) ◽  
Author(s):  
Luca Aluigi
Keyword(s):  
Solar Flares ◽  
Microwave Radiometer ◽  
Low Earth Orbit ◽  
Wave System ◽  
Flare Activity ◽  
Millimetre Wave ◽  
Analysis And Design ◽  
Order Of Magnitude ◽  
Low Earth Orbit Satellites ◽  
On Chip

Solar flares, intense bursts of radiation, can disrupt the atmosphere and potentially affect communication, navigation and electrical systems. A newly developed miniaturised microwave radiometer used on a space-borne platform should offer astronomers unprecedented understanding of the largest explosive phenomena in our solar system. In this paper the activity and results of the EU funded research project FLARES are presented. Objective of FLARES has been the study, analysis and design of millimetre-wave (mm-wave) system-on-chip (SoC) radiometer for space-borne detection of solar flares. The proposed approach has contributed to reduce significantly the power consumption and weight with respect to the existing instruments for the observation and study of solar flares. In particular, the proposed SoC Dicke radiometer can achieve one order of magnitude improvement in terms of resolution, so allowing the detection of solar flares with relatively low intensity, i.e. about 100 times lower than those currently detected by the existing systems, owing to space-borne operations and the microchip-level miniaturization through silicon technology under space qualification. 

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