Experimental Investigations of 3-D-/4-D-CAP Modulation With Directly Modulated VCSELs

Othman, M. B.; Zhang, Xu; Deng, Lei; Wieckowski, M.; Jensen, Jesper Bevensee; Monroy, Idelfonso Tafur

doi:10.1109/lpt.2012.2217811

Cited by 36 publications

(9 citation statements)

References 7 publications

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“…High dimensionality 3D-CAP and 4D-CAP with directly modulated vertical cavity surface emitting lasers (DM-VCSELs) over 20 km SSMF has been experimentally demonstrated for the first time to provide more flexibility in optical fiber systems [17]. However, it requires excessive bandwidth due to the higher upsampling factor that resulting to decreased spectral efficiency performance.…”

Section: Cap Motivationmentioning

confidence: 99%

A Carrierless Amplitude Phase (CAP) Modulation Format: Perspective and Prospect in Optical Transmission System

Ridzuan

Abdullah

Othman

et al. 2018

IJECE

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The explosive demand of broadband services nowadays requires data communication systems to have intensive capacity which subsequently increases the need for higher data rate as well. Although implementation of multiple wavelengths channels can be used (e.g. 4 × 25.8 Gb/s for 100 Gb/s connection) for such desired system, it usually leads to cost increment issue which is caused by employment of multiple optical components. Therefore, implementation of advanced modulation format using a single wavelength channel has become a preference to increase spectral efficiency by increasing the data rate for a given transmission system bandwidth. Conventional advanced modulation format however, involves a degree of complexity and costly transmission system. Hence, carrierless amplitude phase (CAP) modulation format has emerged as a promising advanced modulation format candidate due to spectral efficiency improvement ability with reduction of optical transceiver complexity and cost. The intriguing properties of CAP modulation format are reviewed as an attractive prospect in optical transmission system applications.

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Section: Cap Motivationmentioning

confidence: 99%

A Carrierless Amplitude Phase (CAP) Modulation Format: Perspective and Prospect in Optical Transmission System

Ridzuan

Abdullah

Othman

et al. 2018

IJECE

Self Cite

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“…To the author's knowledge, the only method of finding base functions in three or more dimensions known so far is the minimax optimization procedure, which was first applied for this purpose in [11]. This method was later modified or enhanced by other authors [7], [12], [13]. In this paper, the optimization problem is formulated as a minimax problem as follows:…”

Section: B Choice Of Cap Transceiver Filters For Three and More Dimementioning

confidence: 99%

“…3(a). Some authors [7] include in the objective function also minimization of the dc component of the filter frequency responses. The reason for this is to avoid baseline wander, which may present a problem at some transmitters, especially those with a dc null in their transmission characteristics.…”

Section: B Choice Of Cap Transceiver Filters For Three and More Dimementioning

confidence: 99%

“…Furthermore, power dissipation in a CAP system is significantly lower than in an OFDM system [3], where energy-consuming fast inverse fast Fourier transform block is used. Yet another useful feature of multidimensional CAP is the possibility of providing multiple access, similar to code division multiple access (CDMA) [7]. Here, the signature waveforms of CAP take a role of orthogonal codes in CDMA and could be used for upstream transmission in a passive optical network.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, although the multidimensional CAP is known for several years, only one experimental demonstration is known to the author [7]. In this paper, therefore we aim to complete the knowledge on multidimensional CAP.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Efficiency of <italic>N</italic>-Dimensional CAP Modulations

Stępniak

2014

J. Lightwave Technol.

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There is a growing interest in applying carrierless amplitude-phase (CAP) modulation in intensity modulated optical links. CAP as a multilevel modulation scheme can reach high spectral efficiency and be generated at low cost. An interesting feature of CAP is that its signal basis can be extended to three or more dimensions (D). This paper aims to complete the knowledge on 3-D CAP. Discussed are design of transceiver filters, spectral efficiency, and digital equalization in 3-D. Several problems accompanying 3-D CAP transmission are identified. The most significant are the peak to average power ratio, which is higher than in one or two dimensions and noise correlation at the output of a 3-D equalizer. It is found that the latter problem severely degrades bit error rates achieved but can be efficiently mitigated using noise whitening equalization. Finally, 1-D, 2-D, and 3-D CAP are compared experimentally in a step-index polymer optical fiber link.

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Multiband carrierless amplitude and phase index modulation

Puerta

Vesga

Jaramillo-Ramírez

2020

Int J Communication

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SummaryAs 5G standards continue to evolve, the need for communication systems with higher data rates is clear. However, the available bandwidth in the spectrum in most of the cases is limited and is not sufficient to satisfy future demands. Higher data rates drive the need for more efficient schemes to transmit information. Currently, there are different physical‐layer (PHY) technologies that enable increasing data rates with a limited bandwidth such as flexible multicarrier waveforms and channel coding schemes. Index modulation (IM), which uses alternative ways to transmit extra information compared to traditional communication systems, is an innovative PHY solution to increase capacity and spectral efficiency (SE). In this paper, a new IM scheme based on multicarrier quadrature amplitude modulation/carrierless amplitude phase (QAM/CAP) modulation is presented. The property used by this scheme is, provided a contiguous fixed bandwidth, the feasibility to transmit the same amount of data by transmitting different number of contiguous frequency bands by adjusting their bandwidths. To increase the SE, an extra degree of freedom is generated by dynamically changing the distribution of the frequency bands being transmitted, that is, the number of bands used and its bandwidths and subcarrier frequencies. Simulation results are presented to validate the feasibility of the proposed scheme.

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Experimental Investigations of 3-D-/4-D-CAP Modulation With Directly Modulated VCSELs

Cited by 36 publications

References 7 publications

A Carrierless Amplitude Phase (CAP) Modulation Format: Perspective and Prospect in Optical Transmission System

A Carrierless Amplitude Phase (CAP) Modulation Format: Perspective and Prospect in Optical Transmission System

Comparison of Efficiency of <italic>N</italic>-Dimensional CAP Modulations

Multiband carrierless amplitude and phase index modulation

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