Squared Pulse Shaping Filters for ISI-Free Communication in Optical Intensity Channels

Bhandari, Ayush; Kumar, Manish; Trikha, M.

doi:10.1109/siu.2007.4298777

Cited by 2 publications

(2 citation statements)

References 9 publications

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“…He concluded that transmission is possible with a bandwidth twice the required bandwidth over the corresponding conventional electrical channels. This work was extended to other Nyquist pulses that can introduce a trade-off between bandwidth and average optical power in [9], [31].…”

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confidence: 99%

Bandlimited Intensity Modulation

Tavan

Agrell

Karout

2012

IEEE Trans. Commun.

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In this paper, the design and analysis of a new bandwidth-efficient signaling method over the bandlimited intensity-modulated direct-detection (IM/DD) channel is presented. The channel can be modeled as a bandlimited channel with nonnegative input and additive white Gaussian noise (AWGN).Due to the nonnegativity constraint, standard methods for coherent bandlimited channels cannot be applied here. Previously established techniques for the IM/DD channel require bandwidth twice the required bandwidth over the conventional coherent channel. We propose a method to transmit without intersymbol interference in a bandwidth no larger than the bit rate. This is done by combining Nyquist or root-Nyquist pulses with a constant bias and using higher-order modulation formats. In fact, we can transmit with a bandwidth equal to that of coherent transmission. A trade-off between the required average optical power and the bandwidth is investigated. Depending on the bandwidth required, the most power-efficient transmission is obtained by the parametric linear pulse, the so-called "better than Nyquist" pulse, or the root-raised cosine pulse. Index TermsIntensity-modulated direct-detection (IM/DD), strictly bandlimited signaling.

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confidence: 99%

Bandlimited Intensity Modulation

Tavan

Agrell

Karout

2012

IEEE Trans. Commun.

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Section: Introductionmentioning

confidence: 99%

Strictly Bandlimited ISI-Free Transmission over Intensity-Modulated Channels

Tavan

Agrell

Karout

2011

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

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In this paper, the design and analysis of a new bandwidth-efficient signalling method over the bandlimited intensity-modulated direct-detection (IM/DD) channel is proposed. The channel can be modeled as a bandlimited channel with nonnegative input and additive white Gaussian noise. Due to the nonnegativity constraint, the methods previously proposed for conventional bandlimited channels cannot be applied here. We propose a method to transmit without intersymbol interference in a narrower bandwidth compared to previous works, by combining Nyquist pulses with a constant bias. In fact, we can transmit with a bandwidth equal to that of coherent transmission. A trade-off between the required average optical power and the bandwidth is investigated. At low bandwidths, the most powerefficient transmission is obtained by either the parametric linear pulse or the so-called "better than Nyquist" pulse, depending on the exact bandwidth.

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Squared Pulse Shaping Filters for ISI-Free Communication in Optical Intensity Channels

Cited by 2 publications

References 9 publications

Bandlimited Intensity Modulation

Bandlimited Intensity Modulation

Strictly Bandlimited ISI-Free Transmission over Intensity-Modulated Channels

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