OFDM for Optical Communications

Armstrong, Jean

doi:10.1109/jlt.2008.2010061

Cited by 1,805 publications

(863 citation statements)

References 67 publications

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“…Both shot-noise and thermal-noise are introduced at the receiver, which may be modeled as additive white Gaussian noise (AWGN) [15]. After serial-to-parallel (S/P) conversion and CP removal, the received signals r n , n = 0, 1, · · · , N −1, are then transformed to the frequency domain by fast Fourier transform (FFT)…”

Section: Ofdm-based Vlc Systemmentioning

confidence: 99%

Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control

Wang

Hanzo

Dai

2015

IEEE Photon. Technol. Lett.

109

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Abstract-This letter proposes an asymmetrical hybrid optical orthogonal frequency division multiplexing (AHO-OFDM) scheme for dimmable visible light communication systems. In the proposed scheme, either asymmetrically clipped optical OFDM (ACO-OFDM) or pulse-amplitude-modulated discrete multitone (PAM-DMT) signal is inverted and then both the signals are combined for transmission, where pulsewidth modulation is no longer required for dimming control. The power of ACO-OFDM and PAM-DMT signals is adjusted so that the amplitude of the combined AHO-OFDM signal is asymmetrical, which could utilize all the available subcarriers as well as the entire dynamic range of light-emitting diodes with various dimming levels. Simulation results show that the proposed scheme could achieve a wide dimming range with a small throughput fluctuation.Index Terms-Orthogonal frequency division multiplexing (OFDM), visible light communication (VLC), dimming control, light emitting diode (LED).

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Section: Ofdm-based Vlc Systemmentioning

confidence: 99%

Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control

Wang

Hanzo

Dai

2015

IEEE Photon. Technol. Lett.

109

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“…In fact, let us suppose that we transmit, along with the useful signal, a PT. The received signal becomes (8) where parameter takes into account the power allocation between the useful signal and the unmodulated carrier, frequency the position of the PT, and unit vector its SOP. Considering the fiber transfer matrix in (3), we note that, while the useful signal (first term), with a bandwidth of about , is strongly affected by GVD and sees a channel with memory , the PT (second term), due to its much narrower bandwidth , is not affected by GVD (i.e.,…”

Section: B Dispersion-uncompensated Linksmentioning

confidence: 99%

“…In the light of such an upgrade, other transmission techniques, alternative to standard singlecarrier (SC) schemes, have been proposed, since they seemingly allow to more easily scale to higher bit rates, such as orthogonal frequency division multiplexing (OFDM) [5], whose success and popularity in wireless communications several authors push to repeat in optical communications [6]- [8]. Besides more general considerations about the debate between SC and OFDM (see [9]), one of the most severe impairment that affects coherent systems employing high-order modulation formats is the presence of phase noise (PN) [10], [11], introduced by both transmit and receive lasers-the former also present in widespread intensity-modulation direct-detection systems, the latter peculiar to coherent systems.…”

mentioning

confidence: 99%

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

Colavolpe

Foggi²,

Forestieri

et al. 2011

J. Lightwave Technol.

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Abstract-One of the most severe impairments that affect coherent optical systems employing high-order modulation formats is phase noise due to transmit and receive lasers. This is especially detrimental in uncompensated links, where an ideal compensator for channel distortions and laser phase noise should first eliminate receive phase noise, then equalize channel distortions, and only later compensate for transmit phase noise. Unfortunately, the simultaneous presence of transmit and receive phase noise makes very difficult to discriminate between them, even in the presence of a pilot tone. Moreover, the picture is different for optical systems using single-carrier or orthogonal frequency division multiplexing, where transmit and receive phase noise components may have a different impact. All these aspects are analyzed and discussed in this paper. A novel digital coherence enhancement (DCE) technique, able to significantly reduce the phase noise of transmit or receive lasers by using an interferometric device plus a very simple electronic processing, is also described. The performance of this technique and the statistical properties of the residual phase noise are analytically derived and verified by simulations, showing a high increase of the maximum bit-rate-distance product. The practical implementation of DCE is finally discussed and some alternative implementation schemes are presented.Index Terms-Coherent detection, group velocity dispersion (GVD), optical communication, orthogonal frequency division multiplexing (OFDM), phase noise.

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“…Several authors recently proposed using OFDM in high-speed optical communication links as a possible alternative to standard SC modulations [22]- [24]. The block diagram of an OFDM optical communication system without polarization multiplexing is shown in Fig.…”

Section: B Ofdmmentioning

confidence: 99%

OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

Barbieri

Colavolpe

Foggi

et al. 2010

J. Lightwave Technol.

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Abstract-We analyze the orthogonal frequency division multiplexing (OFDM) technique in long-haul next generation optical communication links and compare it with the well-established single-carrier (SC) data transmission using high-level modulation formats and coherent detection. The analysis of the two alternative solutions is carried out in the 100 Gbps scenario, which is commonly considered to be the next upgrade of existing optical links, with special emphasis on quaternary phase-shift keying (QPSK) modulations. The comparison between OFDM and SC takes into account the main linear and nonlinear impairments of the optical channel, e.g., group velocity dispersion (GVD), polarization mode dispersion (PMD), self-phase modulation (SPM), cross-phase modulation (XPM), and four-wave mixing (FWM), as well as the phase noise due to transmit and receive lasers, their relative frequency offset, other synchronization aspects, the overall complexity, the power and spectral efficiency, and the technological constraints.Index Terms-Cross-phase modulation (XPM), four-wave mixing (FWM), group velocity dispersion (GVD), optical coherent transmission systems, orthogonal frequency division multiplexing (OFDM), phase-shift keying (PSK), polarization mode dispersion (PMD), self-phase modulation (SPM), single-carrier transmissions.

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OFDM for Optical Communications

Cited by 1,805 publications

References 67 publications

Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control

Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control

Impact of Phase Noise and Compensation Techniques in Coherent Optical Systems

OFDM versus Single-Carrier Transmission for 100 Gbps Optical Communication

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