scholarly journals Radio-frequency ring resonators for self-referencing fiber-optic intensity sensors

2005 ◽  
Vol 44 (4) ◽  
pp. 040502 ◽  
Author(s):  
C. Va´zquez
Keyword(s):  
Radio Frequency ◽  
Fiber Optic ◽  
Ring Resonators

scholarly journals Compound Lasing Fiber Optic Ring Resonators for Sensor Sensitivity Enhancement

2015 ◽  
Vol 33 (12) ◽  
pp. 2690-2696 ◽  
Author(s):  
Sergio Rota-Rodrigo ◽  
Miguel Gonzalez-Herraez ◽  
Manuel Lopez-Amo
Keyword(s):  
Fiber Optic ◽  
Sensitivity Enhancement ◽  
Ring Resonators ◽  
Sensor Sensitivity

Experimental study of a double-circuit optoelectronic generator of radio-frequency signals

Antennas ◽  
2021 ◽  
Author(s):  
V. A. Grachev ◽  
S. A. Kapustin ◽  
T. V. Kozhevnikova ◽  
D. G. Kulyaba ◽  
N. A. Novoselova ◽  
...  
Keyword(s):  
Radio Frequency ◽  
High Frequency ◽  
Feedback Loop ◽  
Fiber Optic ◽  
Electronic Devices ◽  
Spectral Characteristics ◽  
Intrinsic Noise ◽  
Frequency Stability ◽  
Frequency Noise ◽  
Optoelectronic Oscillator

An urgent issue is the development of radio frequency generators operating in the microwave range, with high frequency stability, wide tuning band, as well as small size and weight. Microwave signal generators are used as part of radio electronic devices and devices for telecommunication, radio navigation and metrological purposes; therefore, improving their main characteristics is an important goal for the further development of radio electronic devices. A technological feature of optoelectronic generators is the combined use of solid-state components of modern HF and UHF optoelectronics, fiber optics and traditional components of UHF/EHF technology. According to the principle of operation and construction scheme, the optoelectronic generator is similar to the classic radio-frequency self-oscillator with a delay line in the feedback circuit. A feature of its work is the multifrequency nature of the generated oscillations, for which the conditions for amplitude balance and phase balance are satisfied. In the case of an optoelectronic generator, a feedback ring with a resonant system and a delay element is made using a single-mode fiber of a certain length. The signal delay time in the feedback loop is a significant parameter of the optoelectronic generator, which affects the noise and spectral characteristics of the generator. With an increase in the length of the fiber-optic path, the delay time in the feedback loop increases, thereby reducing the level of frequency noise. However, with an increase in the length of the fiber-optic path, the distance between adjacent modes of the optoelectronic oscillator also decreases, increasing the requirements for the bandwidth of the band-pass filter. The solution to this problem was the use of a multi-circuit optoelectronic generator. The paper considers a model created by the authors for a two-circuit optoelectronic generator with fiber-optic paths 1000 m and 30 m long. The available element base did not allow to reduce the generator's weight and dimensions. On this model, the characteristics of the circuit elements have been experimentally studied. The spectral characteristics of the generator have been estimated theoretically, which are in good agreement with the results of practical research. Phase noise is an important parameter in generator evaluation. Oscillators used as reference and measuring oscillators must certainly have a high frequency stability of the generated signal. Oscillations in autogenerators arise due to the effect of intrinsic noise in the circuit elements, which is one of the reasons for the occurrence of noise in the spectrum of the generator output signal. Intrinsic noise includes thermal, shot and flicker noises in semiconductor elements of generators. The article calculates the power spectral density of the phase noise of a single-loop oscillator and a dual-loop oscillator, which confirmed the assumption about a compromise between the noise level and the requirement for the filter bandwidth in a single-loop optoelectronic oscillator. An important advantage of optoelectronic generators, in comparison with generators built according to classical circuitry, is the absence of a compromise between the frequency tuning band of the device generation and the level of frequency noise.

A dual‐band high‐gain quasi‐Yagi antenna with split‐ring resonators for radio frequency energy harvesting

2019 ◽  
Vol 61 (9) ◽  
pp. 2174-2181 ◽  
Author(s):  
Zhicong Chen ◽  
Miaowang Zeng ◽  
Andrey S. Andrenko ◽  
Yongzhao Xu ◽  
Hong‐Zhou Tan
Keyword(s):  
Energy Harvesting ◽  
Radio Frequency ◽  
High Gain ◽  
Ring Resonators ◽  
Dual Band ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Radio Frequency Energy ◽  
Yagi Antenna

Fiber Optic Signal Transmission to Reduce Radio-Frequency Interference from a High-Voltage Spark Source

1983 ◽  
Vol 37 (6) ◽  
pp. 537-539 ◽  
Author(s):  
Steven G. Barnhart ◽  
John P. Walters
Keyword(s):  
Optical Fiber ◽  
Radio Frequency ◽  
High Voltage ◽  
Fiber Optic ◽  
Signal Transmission ◽  
Radio Frequency Interference ◽  
Computer Logic ◽  
Optical Fiber Cable ◽  
And Performance ◽  
Discharge Experiment

The incorporation of fiber optic signal transmission into a high voltage spark discharge experiment to reduce radio-frequency interference is described. Electrical isolation and the elimination of ground loops provided by the fiber optic links allow the use of sensitive CMOS computer logic in control of an electrically noisy spark source experiment. Circuit schematics are given and performance with three optical fiber cable types is described.

scholarly journals WDM-based radio frequency dissemination in a tree-topology fiber optic network

2015 ◽  
Vol 23 (15) ◽  
pp. 19783 ◽  
Author(s):  
Longqiang Yu ◽  
Rong Wang ◽  
Lin Lu ◽  
Yong Zhu ◽  
Jilin Zheng ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Fiber Optic ◽  
Tree Topology ◽  
Fiber Optic Network ◽  
Optic Network

Coherence effect on decryption characteristics in message modulation type chaos secure communication systems using fiber-optic ring resonators

2009 ◽  
Vol 282 (20) ◽  
pp. 4141-4145 ◽  
Author(s):  
Yoh Imai ◽  
Satoshi Yamauchi ◽  
Hirohisa Yokota ◽  
Takehito Suzuki ◽  
Kansuke Tsuji
Keyword(s):  
Secure Communication ◽  
Communication Systems ◽  
Fiber Optic ◽  
Ring Resonators ◽  
Modulation Type ◽  
Coherence Effect
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