Topic
Optical Carrier transmission rates
About: Optical Carrier transmission rates is a research topic. Over the lifetime, 2463 publications have been published within this topic receiving 33293 citations.
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17 Dec 2015
TL;DR: In this article, a photonics-based ultra wideband RF receiver for spectrum sensing applications is presented, which scans the RF spectrum at discrete steps, down-converting at baseband single portions of the detected spectrum, where they can be precisely acquired.
Abstract: This paper presents an innovative photonics-based ultra wideband RF receiver for spectrum sensing applications. The scheme scans the RF spectrum at discrete steps, down-converting at baseband single portions of the detected spectrum, where they can be precisely acquired. The down-conversion is performed modulating a tunable optical carrier with the RF signal, and beating it with an optical local oscillator. The selection of the desired spectrum portion is achieved tuning the wavelength of the optical carrier, avoiding tunable optical filters and allowing a fast scanning of the detected spectrum. The phase locking between the carrier and the local oscillator by means of a coherent optical comb generator ensures very low phase noise. An experimental validation shows an RF input range of 0.5÷9.5 GHz, with high sensitivity and dynamic range. Increasing the number of comb lines by enhancing the comb generation, the architecture has the potential to detect RF signals up to 100GHz. Moreover, implementing the scheme through integrated photonics technologies will ensure high environmental stability and reduced size weight and power consumption, meeting the increasingly stringent requirements of RF spectrum sensing applications.
6 citations
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29 Jan 2014
6 citations
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TL;DR: Optical two-tone (OTT) signal generation is demonstrated without optical wavelength filtering for wavelength-free operation in radio-frequency (RF) upconversion assisted by photonics.
Abstract: Optical two-tone (OTT) signal generation is demonstrated without optical wavelength filtering for wavelength-free operation in radio-frequency (RF) upconversion assisted by photonics. This principle is based on selective polarization manipulation for the optical carrier; the optical carrier’s polarization is first tilted, and the carrier is then suppressed using a polarizer. Owing to optimized conditions obtained from theoretical calculation and the high polarization extinction ratio achieving a 25.7-dB carrier suppression, a 40-GHz separated OTT signal is successfully generated by an optical intensity modulator driven by a 10-GHz sinusoidal RF signal. Conversion into a frequency-quadrupled RF signal is also demonstrated experimentally.
6 citations
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TL;DR: In this paper, a new architecture for bidirectional gigabit colorless wavelength division multiplexed-passive optical network system based on a reflective semiconductor optical amplifier is proposed, which uses techniques of both optical carrier suppression and subcarrier multiplexing.
6 citations
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06 Aug 2014
TL;DR: In this paper, a vibration information obtaining method based on an optoelectronic oscillator is proposed, which consists of the steps that optical carrier waves generated by a light source in the Optoelectric oscillator are modulated through a single side band to obtain modulated optical signals; vibration information from a vibrator is picked up through an energy storage optical fiber of the optoeelectronic oscillators and is loaded to the modulated signals to obtain optical signals carrying the vibration information; photovoltaic conversion and vibration are carried out on the optical signals carried the vibration
Abstract: The invention discloses a vibration information obtaining method based on an optoelectronic oscillator. The method comprises the steps that optical carrier waves generated by a light source in the optoelectronic oscillator are modulated through a single side band to obtain modulated optical signals; vibration information from a vibrator is picked up through an energy storage optical fiber of the optoelectronic oscillator and is loaded to the modulated optical signals to obtain optical signals carrying the vibration information; photovoltaic conversion and vibration are carried out on the optical signals carrying the vibration information to obtain vibration signals; digital demodulation is carried out on the vibration signals after the vibration signals are processed and collected, so that the vibration information is obtained. According to the vibration information obtaining method based on the optoelectronic oscillator, the long energy storage optical fiber of the optoelectronic oscillator serves as a sensing optical fiber, the sensitiveness of a sensor can be improved, the sensor is not affected by light-intensity variation of a laser device, and high-sensitiveness vibration signal measurement can be achieved.
6 citations