Generalized Pulse-Position Modulation for Optical Power-Efficient Communication

Karlsson, Magnus; Agrell, Erik

doi:10.1364/ecoc.2011.tu.6.b.6

Cited by 16 publications

(8 citation statements)

References 11 publications

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“…This yields B F = 2 log 2 (K) + 4 bits per PPMframe, SE = log 2 (4K)/K and γ = log 2 (4K)/2. For any K, this family of formats has both higher SE and γ compared to KPPM-PM-QPSK which was also discussed in [4]. Note that the same SE and γ are obtained for KPPM-QPSK as PM-KPPM-QPSK.…”

Section: A Conventional Ppm and Ppm In Combination With Iq-modulationsupporting

confidence: 60%

“…The KPPM format has N = K dimensions and carries B F = log 2 (K) bits per PPM frame. The SE for KPPM is SE = 2 log 2 (K)/K and the asymptotic power efficiency is γ = log 2 (K)/2 [4]. The KPPM signal can be polarization multiplexed as illustrated in Fig.…”

Section: A Conventional Ppm and Ppm In Combination With Iq-modulationmentioning

confidence: 99%

“…Also included in Fig. 4 is the 4D format C 4,16 , which has been found by sphere packing [29], and has the same SE as QPSK and 1.11 dB better power efficiency.…”

Section: B 4imdpm-qpsk and 8imdpm-qpskmentioning

confidence: 99%

“…By using PPM in combination with, e.g. PM-QPSK or PS-QPSK, modulation formats with increased power efficiency can be found at the expense of reduced SE [4]. Other physical properties can also be used to increase the dimensionality of the signal space, i.g.…”

Section: Introductionmentioning

confidence: 99%

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<italic>K</italic>-Over-<italic>L</italic> Multidimensional Position Modulation

Eriksson

Johannisson

Puttnam

et al. 2014

J. Lightwave Technol.

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We analyze a family of modulation formats based on multidimensional position modulation (MDPM) with multiple pulses per frame (K-over-L-MDPM) in combination with quadrature phase shift keying (QPSK), polarization multiplexed QPSK (PM-QPSK) and polarization-switched QPSK (PS-QPSK). MDPM is a generalization of pulse position modulation (PPM) where different pulse slots can be realized by time slots, polarization states, frequencies, modes of multimode fibers, cores in multicore fibers or a combination of these. We show that by using K-over-L-MDPM with QPSK, it is possible to simultaneously increase both the spectral efficiency and the asymptotic power efficiency over QPSK. We also identify K-ary inverse-MDPM (KiMDPM-QPSK) as the special case of K-over-(K − 1)-MDPM and show that 4iMDPM-QPSK has a 1.25 dB increased asymptotic power efficiency over QPSK with a maintained spectral efficiency.Index Terms-Digital modulation, multicore fiber, multidimensional position modulation (MDPM), multiple pulse position modulation (MPPM), optical fiber communication, polarizationswitched quadrature phase shift keying (PS-QPSK), power efficiency, pulse position modulation (PPM), quadrature phase shift keying (QPSK), sensitivity, spectral efficiency.

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Section: A Conventional Ppm and Ppm In Combination With Iq-modulationsupporting

confidence: 60%

Section: A Conventional Ppm and Ppm In Combination With Iq-modulationmentioning

confidence: 99%

“…Also included in Fig. 4 is the 4D format C 4,16 , which has been found by sphere packing [29], and has the same SE as QPSK and 1.11 dB better power efficiency.…”

Section: B 4imdpm-qpsk and 8imdpm-qpskmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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<italic>K</italic>-Over-<italic>L</italic> Multidimensional Position Modulation

Eriksson

Johannisson

Puttnam

et al. 2014

J. Lightwave Technol.

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show abstract

“…This format is known as polarization-switched QPSK (PS-QPSK) [1,2]. Together with 2-pulse-position QPSK, PS-QPSK is the most power efficient modulation format in signal spaces with up to four dimensions [1][2][3]. It has similar implementation complexity as PM-QPSK and has attracted a lot of attention recently.…”

Section: Introductionmentioning

confidence: 99%

Transmission of PM-QPSK and PS-QPSK with different fiber span lengths

Sjödin¹,

Puttnam²,

Johannisson³

et al. 2012

Opt. Express

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Abstract:We perform experimental and numerical investigations of the transmission reach of polarization-switched QPSK (PS-QPSK) and polarization-multiplexed QPSK (PM-QPSK) for three different fiber span lengths: 83, 111 and 136 km. In the experimental comparison we investigate the performance of PS-QPSK at 20 Gbaud and PM-QPSK at the same bit rate (60 Gbit/s) and at the same symbol rate, both the single channel case and a WDM system with 9 channels on a 50 GHz grid. We show that PS-QPSK gives significant benefits in transmission reach for all span lengths. Compared to PM-QPSK, use of PS-QPSK increases the reach with more than 41% for the same symbol rate and 21% for the same bit rate. In the numerical simulations we use the same data rates as in the experiment. The simulation results agree well with the experimental findings, but the transmission reach is longer due to the absence of various non-ideal effects and higher back-to-back sensitivity. Apart from using data coded in the absolute phase in the simulations, we also investigate differentially coded PS-QPSK for the first time and compare with PM-QPSK with differential coding. The power efficiency advantage of PS-QPSK then increases with approximately 0.3 dB at a bit error rate of 10, resulting in a further relative transmission reach improvement over PM-QPSK. Both the experimental and the numerical results indicate that PS-QPSK has slightly higher tolerance to inter-channel nonlinear crosstalk than PM-QPSK.

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Energy Efficiency in Optical Networks

Kilper

2020

Springer Handbook of Optical Networks

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Firstly, for the proper understanding of this project, the main architectures and technologies used to develop a network over fiber are going to be presented. In addition, some energy-saving models proposed by different working groups, applicable in a close future at the optical unit, will be introduced. Next, the most important devices used in the deployment of a network over fiber optics are shown. Also, the main technical data, relevant for some simulations described in the final part of the project, are presented. Finally, the results on the energy efficiency of the different technologies discussed will be shown. The efficiency of each one will be studied based on the most important physical parameters in the deployment of an access network over fiber.

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Generalized Pulse-Position Modulation for Optical Power-Efficient Communication

Abstract: A family of modulation formats is derived by combining pulse-position modulation (PPM) with multilevel dual-polarization signal constellations. With 16-PPM, gains of up to 5.4 dB are obtained over dual-polarization QPSK, at the cost of reduced spectral efficiency.

Cited by 16 publications

References 11 publications

<italic>K</italic>-Over-<italic>L</italic> Multidimensional Position Modulation

<italic>K</italic>-Over-<italic>L</italic> Multidimensional Position Modulation

Transmission of PM-QPSK and PS-QPSK with different fiber span lengths

Energy Efficiency in Optical Networks

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