Method for generation and long-distance transmission of millimeter-wave signal based on optical heterodyne technology

2021 ◽  
Author(s):  
Lei Hong ◽  
Juan Zheng ◽  
Juanjuan Gu ◽  
Huimin Duan ◽  
Qian Zhang
Keyword(s):  
Millimeter Wave ◽  
Optical Heterodyne ◽  
Long Distance ◽  
Wave Signal ◽  
Long Distance Transmission

scholarly journals Optical millimeter wave generation utilizing stimulated brillouin scattering for radio over fiber system

2019 ◽  
Vol 13 (2) ◽  
pp. 818
Author(s):  
M.M.H Husaini ◽  
C.B.M Rashidi ◽  
SN Azemi ◽  
S.A Aljunid ◽  
M.S Anuar
Keyword(s):  
Millimeter Wave ◽  
Brillouin Scattering ◽  
Extinction Ratio ◽  
Stimulated Brillouin Scattering ◽  
Radio Over Fiber ◽  
Signal Generation ◽  
Modulation Scheme ◽  
Long Distance ◽  
Wave Signal ◽  
Stimulated Brillouin

<span>Optical millimeter-wave signal generation in Radio over Fiber (RoF) based on external modulators using different modulation schemes such as Single-Sideband (SSB), Double-Sideband (DSB) are experimentally compared. The major fallout for external modulation scheme system performance to downgrade is due to dispersion and the fading effect in optical signal generation while generating high Bit Error Rate (BER) when involving long distance delivery.  In this work, we proposed mm-wave signal utilize Stimulated Brillouin Scattering (SBS) scheme which  indicates the best performance amongst the scheme based on simulation that it achieves to propagate longest of distance over fiber, highest receiver sensitivity, the lowest BER and coherence of Mach-Zehnder Modulator (MZM) extinction ratio. Mm-wave signal of 40 Ghz and 10 Gb/s data rate was generated with the plotting of eye diagram.</span>

A Novel IoT-Based Method for Real-Time Detection of Spontaneous Leaks in Pipelines, Gathering Systems, and Offshore Risers

2021 ◽  
Author(s):  
Matthew Grimes ◽  
Nico Van Rensburg ◽  
Stuart Mitchell
Keyword(s):  
Signal Processing ◽  
Transmission Lines ◽  
Negative Pressure ◽  
Pressure Wave ◽  
Long Distance ◽  
Non Invasive ◽  
Long Distance Transmission ◽  
Offshore Production ◽  
Offshore Risers ◽  
Oil Gas

Abstract This paper presents on a non-invasive, IoT-based method for rapidly determining the presence and location of spontaneous leaks in pressurized lines transporting any type of product (e.g., oil, gas, water, etc.). Specific applications include long-distance transmission lines, gathering networks at well sites, and offshore production risers. The methodology combines proven negative pressure wave (NPW) sensing with advanced signal processing to minimize false positives and accurately identify the presence of small spontaneous leaks within seconds of their occurrence. In the case of long-distance transmission pipelines, the location of the leak can be localized to within 20-50 feet. The solution was commercialized in 2020 and has undergone extensive testing to verify its capabilities. It is currently in use by several operators, both onshore and offshore.

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