Journal ArticleDOI
Frequency Quadrupling and Upconversion in a Radio Over Fiber Link
Hao Chi,Jianping Yao +1 more
TLDR
In this paper, a novel technique to realize frequency quadrupling and upconversion in a radio over fiber (RoF) link is proposed and experimentally demonstrated by using two cascaded Mach-Zehnder modulators (MZMs) that are biased at the minimum transmission point, with a tunable optical delay line placed between the MZMs.Abstract:
In this paper, a novel technique to realize frequency quadrupling and upconversion in a radio over fiber (RoF) link is proposed and experimentally demonstrated. The frequency quadrupling is achieved by using two cascaded Mach-Zehnder modulators (MZMs) that are biased at the minimum transmission point, with a tunable optical delay line placed between the MZMs. By properly adjusting the time delay between the two MZMs, a pair of optical wavelengths with a wavelength spacing corresponding to four times the frequency of the microwave drive signal is generated. The two wavelengths are then sent to a third MZM to which an intermediate-frequency (IF) signal is applied. At the output of the third MZM, a frequency-upconverted signal at the millimeter-wave (mm-wave) band is obtained. The advantages of the technique are that a relatively low-frequency local oscillator (LO) signal is used to generate a high-frequency LO signal and the upconverted signal is more tolerant to the dispersion-induced power fading compared with a conventional RoF link based on double-sideband (DSB) modulation. Experiments are performed to verify the technique.read more
Citations
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Journal Article
Microwave Photonics
TL;DR: In this paper, techniques developed in the last few years in microwave photonics are reviewed with an emphasis on the systems architectures for photonic generation and processing of microwave signals, photonic true-time delay beamforming, radio-over-fiber systems, and photonic analog-to-digital conversion.
Proceedings Article
Microwave photonics
TL;DR: In this paper, microwave photonics techniques developed in the past few years will be reviewed, with an emphasis on system architectures for microwave applications.
Journal ArticleDOI
Millimeter-Wave Radio Over Fiber Optical Upconversion Techniques Relying on Link Nonlinearity
TL;DR: This paper introduces the basics of ROF communication, including optical modulation, the optical channel, and the optical detection techniques, and surveys the family of advanced optical upconversion techniques that exploit the nonlinearity of the ROF link.
Journal ArticleDOI
A continuously tunable and filterless optical millimeter-wave generation via frequency octupling.
TL;DR: This work proposes a cost-effective, continuously tunable and filterless optical millimeter-wave (MMW) signal generation employing frequency octupling using the external modulator with a limited bandwidth of 40 GHz.
Journal ArticleDOI
Simplified optical millimeter-wave generation configuration by frequency quadrupling using two cascaded Mach-Zehnder modulators.
TL;DR: It is proved to be valid that the proposed scheme is insensitive to the MZM bias drift, which demonstrates a relatively higher stability.
References
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Journal ArticleDOI
Optical millimeter-wave generation or up-conversion using external modulators
TL;DR: In this article, the authors compared the performances of optical millimeter-wave generation or up-conversion using external modulators based on different modulation schemes and found that the OCS modulation scheme has the highest receiver sensitivity, highest spectral efficiency and smallest power penalty over long-distance delivery.
Journal ArticleDOI
Frequency chirping in external modulators
Fumio Koyama,Kenichi Iga +1 more
TL;DR: In this paper, a general formula is given that expresses frequency chirping in some types of external intensity modulators, such as the loss modulator, directional-coupler-type modulator and total-internal-reflection type modulator.
Journal ArticleDOI
Technique for optical ssb generation to overcome dispersion penalties in fibre-radio systems
TL;DR: In this article, a method for generating an optical carrier with single sideband modulation using a dual-electrode Mach-Zehnder modulator biased at quadrature is presented.
Journal ArticleDOI
Comparison of optical millimetre-wave system concepts with regard to chromatic dispersion
TL;DR: In this paper, the impact of chromatic dispersion in optical millimetre-wave systems operating in the 1.55 µm wavelength window was investigated. But the effect of dispersion on the performance of optical modulators was not considered.
Journal ArticleDOI
Generation and distribution of a wide-band continuously tunable millimeter-wave signal with an optical external modulation technique
TL;DR: In this article, a new technique to generate and distribute a wide-band continuously tunable millimeter-wave signal using an optical external modulator and a wavelength-fixed optical notch filter is proposed.