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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TL;DR: In this article, a simple theory was described which described the causes and characteristics of three p.m. to a.m discriminator effects in multimode fibredyne systems and compared with the theory.
Abstract: Low-moded coherent optical fibre systems are very microphonic. Any mechanical stress applied to the fibre causes phase modulation of the guided optical carrier, which is then converted to a related amplitude modulation by a fibredyne (fibre optic self-homodyne) detection process at the photodiode. In a companion letter, a simple theory was published which described the causes and characteristics of three p.m. to a.m. discriminator effects in multimode fibredyne systems. Experimental evidence for the two predominant p.m. to a.m. phenomena is presented and compared with the theory.
8 citations
12 Nov 2007
TL;DR: In this paper, the authors demonstrate an innovative full-duplex radio-over-fibre transmission system employing a reflective SOA to perform simultaneous reusing of the optical carrier and data remodulation, thus avoiding the use of local radiofrequency oscillator at the station sites.
Abstract: We demonstrate an innovative full-duplex radio-over-fibre transmission system employing a reflective SOA to perform simultaneous reusing of the optical carrier and data re-modulation, thus avoiding the use of local radiofrequency oscillator at the station sites.
8 citations
TL;DR: In this paper, the effect of cross-phase modulation (XPM) on two copropagating analog channels in an optical fiber link is presented, where the interaction between the two channels is linearized by keeping the self-phase modulation (SPM) and XPM interactions in the strong optical carrier components only at lowest order and then at the next order, deriving the effect on the modulation components of both channels when the optical carrier is strong relative to the other components of the channel.
Abstract: A technique for computing the effect of cross-phase modulation (XPM) on two copropagating analog channels in an optical fiber link is presented. In this approach, the interaction between the two channels is linearized by keeping the self-phase modulation (SPM) and XPM interactions in the strong optical carrier components only at lowest order and then at the next order, deriving the effect on the modulation components of both channels when the optical carrier is strong relative to the other components of the channel. In contrast to some previously suggested approaches, it is not assumed that the pump is undistorted, and therefore, this method accurately describes distortions due to SPM, XPM, and dispersion management in both channels. This method is easily applied to systems with multiple spans employing dispersion management with loss and gain. The expressions for the received radio frequency power and crosstalk between the two channels when direct detection is used are then provided. Using this approach, new expressions for the amplitude modulation and phase modulation modes of the two channels are derived, and the way they exchange energy when SPM, XPM, and dispersion are all considered is explained. This method yields excellent agreement between theory and experimental data.
8 citations
Patent•
09 Oct 2018
TL;DR: In this paper, the authors proposed a probabilistic shaping mapping method for optical orthogonal frequency division multiplexing (OOFDM) communications, which is capable of achieving shaping gain and improving the spectral efficiency of fiber communication.
Abstract: The invention relates to an optical orthogonal frequency division multiplexing communication method and a system thereof based on probabilistic shaping mapping, wherein the method comprises: generating a pseudo random binary bit stream PBRS signal; modulating the PRBS signal to obtain a PS-QAM complex signal; performing serial/parallel conversion, inverse fast Fourier transform and parallel/serialconversion on the PS-QAM complex signal to obtain a baseband OFDM signal, and obtaining an OFDM baseband signal with a cyclic prefix; modulating the OFDM baseband signal onto an optical carrier afterdigital/analog conversion to obtain a PS-OOFDM signal, and transmitting the signal to the optical fiber; converting the PS-OOFDM signal on the optical fiber into an analog OFDM electrical signal; performing analog/digital conversion on the analog OFDM electrical signal to obtain a digital OFDM signal, removing the cyclic prefix, and performing the inverse fast Fourier transform after parallel/serial conversion to obtain the PS-QAM complex signal; separating the real part and the imaginary part of the PS-QAM complex signal, and restoring the corresponding PBRS signal by de-mapping. The invention is capable of achieving shaping gain and improving the spectral efficiency of fiber communication.
8 citations
TL;DR: In this article, a method to improve the accuracy of an optical vector network analyzer (OVNA) with double-sideband (DSB) modulation was proposed, where the measurement errors of the OVNA mainly derive from optical carrier uncertainty and the beating between higher order optical sidebands.
Abstract: We report a method to significantly improve the accuracy of an optical vector network analyzer (OVNA) with double-sideband (DSB) modulation. The measurement errors of the DSB-OVNA mainly derive from optical carrier uncertainty and the beating between higher order optical sidebands. We propose a three-step measurement method and an accuracy-enhanced algorithm to eliminate these measurement errors perfectly. A theoretical model is built to analyze the potential measurement errors as well as to find a way to remove them. Excellent accuracy improvement of the OVNA is confirmed by a proof-of-concept experiment. The OVNA shows an ultrahigh resolution of 667 kHz over a wideband measurement range of 80 GHz.
8 citations