scholarly journals Photodetector optic power optimization to increase the gain on sub-octave microwave photonic link / Optimização da potência óptica do fotodetector para aumentar o ganho na ligação fotónica de microondas sub-octave

2021 ◽  
Vol 5 (5) ◽  
pp. 1990-2001
Author(s):  
Naiara Tieme Mippo ◽  
Paulo Henrique Kiohara Acyoli Bastos ◽  
Felipe Streitenberger Ivo ◽  
Olympio Lucchini Coutinho
Keyword(s):  
Bias Voltage ◽  
Experimental Approach ◽  
Power Optimization ◽  
Rf Power ◽  
Intensity Modulator ◽  
Microwave Photonic ◽  
Spectral Components ◽  
Rf Signal ◽  
Sideband Ratio

An investigation of the optic spectral components beating at the photodetector to recover the RF signal at the output of a sub-octave microwave photonic link is presented, by a theoretical and experimental approach. It is demonstrated the best efficiency is achieved when the carrier to sideband ratio (CSR) is 0 dB at a low bias voltage condition on Mach-Zehnder (MZM) intensity modulator. A RF power link gain improvement of 9.7 dB is demonstrated for a same photodetector incident optic power, compared with a link operating at quadrature bias voltage condition on the MZM.  

scholarly journals Generation of Switchable Chirp Waveforms in the Photonic Domain with Immunity to Dispersion-Induced Power Fading

Photonics ◽  
2021 ◽  
Vol 8 (11) ◽  
pp. 501
Author(s):  
Chaoqun Huang ◽  
Jun Ou ◽  
Hao Chi
Keyword(s):  
Bias Voltage ◽  
Chromatic Dispersion ◽  
Radio Over Fiber ◽  
Rf Power ◽  
Optical Filtering ◽  
Polarization Control ◽  
Mach Zehnder Modulator ◽  
The Stability ◽  
Rf Signal ◽  
The Given

A novel photonic approach to generating switchable multi-format chirp waveforms using a dual-drive dual-parallel Mach–Zehnder modulator (DD-DPMZM) is proposed and experimentally demonstrated. By properly controlling the bias voltage on the DD-DPMZM, different chirp RF waveforms, including the dual-, down-, and up-chirp waveforms, can be obtained when an RF signal and a chirp RF signal are injected into the modulator. A main feature of this approach is that it can eliminate chromatic dispersion-induced RF power fading, which is highly desired in distributed multi-functional radars based on radio over fiber. There is no polarization control and optical filtering in the given scheme, which also improves the stability and feasibility of the approach. An experiment successfully demonstrated the generation and switching of the multi-format chirp waveforms and the capability of immunity to dispersion-induced power fading.

Wideband and Dispersion Immune Microwave Photonic Phase Shifter With Tunable Optical Carrier to Sideband Ratio

2020 ◽  
Vol 38 (19) ◽  
pp. 5262-5269 ◽  
Author(s):  
Yunping Bai ◽  
Mingzheng Lei ◽  
Zhennan Zheng ◽  
Jinwang Qian ◽  
Xiyao Song ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Optical Carrier ◽  
Microwave Photonic ◽  
Sideband Ratio

Optically Filtered Microwave Photonic Links for RF Signal Processing Applications

2011 ◽  
Vol 29 (16) ◽  
pp. 2394-2401 ◽  
Author(s):  
Anjali Agarwal ◽  
Tom Banwell ◽  
Ted K. Woodward
Keyword(s):  
Signal Processing ◽  
Microwave Photonic ◽  
Photonic Links ◽  
Rf Signal ◽  
Rf Signal Processing

Single Wafer, Anisotropic Etching of Polysilicon with C12/SF6 and Trielectrode Reactor Operation

1986 ◽  
Vol 68 ◽  
Author(s):  
James E. Nulty
Keyword(s):  
Bias Voltage ◽  
Etch Rate ◽  
Proximity Effects ◽  
The Self ◽  
Rf Power ◽  
Reactor Operation ◽  
Lower Electrode ◽  
Dc Bias ◽  
Bias Versus ◽  
Etching System

AbstractA totally anisotropic, highly selective dry poly etch process has been developed that is capable of etching sub-2.0 micron linewidths.Doped poly etch rates of 10,000 A/min.are obtained using C12-only chemistry.Standard novolac or bilevel photoresist is used, depending on the lithography requirements.Anisotropy is achieved without the use of carbon-containing gases; as a result, minimal proximity effects are observed between dense and stand alone etched lines.Wafer maps of etched linewidths on 4-inch wafers are presented, showing mask to final bias and uniformity results.A commercially available triode dry etching system was used for the work.The self-induced dc bias voltage can be selected regardless of the applied rf power.The effect of variable self-induced dc bias versus applied rf power is presented for selectivity, upper and lower electrode interactions, and etch rate uniformity.Characterization by the use of spectroscopy is also presented, showing changes due to varying the self-induced dc bias at a constant rf power.

Broadband tunable microwave photonic phase shifter with low RF power variation in a high-Q AlN microring

2016 ◽  
Vol 41 (15) ◽  
pp. 3599 ◽  
Author(s):  
Xianwen Liu ◽  
Changzheng Sun ◽  
Bing Xiong ◽  
Jian Wang ◽  
Lai Wang ◽  
...  
Keyword(s):  
Phase Shifter ◽  
Rf Power ◽  
High Q ◽  
Microwave Photonic ◽  
Power Variation ◽  
Tunable Microwave

NBR surface modification by Ar plasma and its tribological properties

2016 ◽  
Vol 68 (2) ◽  
pp. 227-232 ◽  
Author(s):  
Dawit Zenebe Segu
Keyword(s):  
Plasma Treatment ◽  
Bias Voltage ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Butadiene Rubber ◽  
Rf Power ◽  
Wear Properties ◽  
Content Type ◽  
Ion Plasma ◽  
Ar Plasma

Purpose – The purpose of this paper is to study the possibility and validity of using radio frequency (RF) power argon (AR) ion plasma treatment to modify the surface of nitrile butadiene rubber (NBR) and the change in the chemical structure under various bias voltage. Using wear test, the authors also compared the friction and wear properties of untreated and treated NBR. Design/methodology/approach – The hybrid RF-power sputtering system was used to generate RF Ar plasma to modify the surface of NBR specimens. The tribological properties were evaluated by ball-on-disc test using a load cell mounted on the ball holder. Findings – It was found that the NBR surface treated by the Ar plasma improved the wettability, friction and wear performance than the untreated NBR. The ATR-IR analysis indicated that the improvement come from the oxygen based functional groups generated on the surface of NBR. The improvement of friction and wear resistance may also come from the formation of nanostructure surface. Originality/value – In this study, the authors develop the RF AR ion plasma treatment at different bias voltage, and it has been used to modify the surface of NBR to increase the tribological performance.

Sign in / Sign up

Export Citation Format

Share Document