Optical differential quadrature phase-shift key (oDQPSK) for high capacity optical transmission

Griffin, Robert; Carter, A.C.

doi:10.1109/ofc.2002.1036420

Cited by 215 publications

(83 citation statements)

References 3 publications

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“…The maximum spectral efficiency is (17) As in [11], [43], and [44], the maximum spectral efficiency can be derived by maximizing the output entropy (18) If the input electric field is Gaussian distributed with , the output photon distribution is and…”

Section: Quantum Regimementioning

confidence: 99%

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Spectral Efficiency Limits and Modulation/Detection Techniques for DWDM Systems

Kahn

2004

IEEE J. Select. Topics Quantum Electron.

289

147

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Abstract-Information-theoretic limits to spectral efficiency in dense wavelength-division-multiplexed (DWDM) transmission systems are reviewed, considering various modulation techniques (unconstrained, constant-intensity, binary), detection techniques (coherent, direct), and propagation regimes (linear, nonlinear). Spontaneous emission from inline optical amplifiers is assumed to be the dominant noise source in all cases. Coherent detection allows use of two degrees of freedom per polarization, and its spectral efficiency limits are several b/s/Hz in typical terrestrial systems, even considering nonlinear effects. Using either constant-intensity modulation or direct detection, only one degree of freedom per polarization can be used, significantly reducing spectral efficiency. Using binary modulation, regardless of detection technique, spectral efficiency cannot exceed 1 b/s/Hz per polarization. When the number of signal and/or noise photons is small, the particle nature of photons must be considered. The quantum-limited spectral efficiency for coherent detection is slightly smaller than the classical capacity, but that for direct detection is 0.3 b/s/Hz higher than its classical counterpart. Various binary and nonbinary modulation techniques, in conjunction with appropriate detection techniques, are compared in terms of their spectral efficiencies and signal-to-noise ratio requirements, assuming amplified spontaneous emission is the dominant noise source. These include a) pulse-amplitude modulation with direct detection, b) differential phase-shift keying with interferometric detection, c) phase-shift keying with coherent detection, and d) quadrature-amplitude modulation with coherent detection.

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Section: Quantum Regimementioning

confidence: 99%

“…with interferometric detection 1 [15]- [17], phase-shift keying (PSK) with coherent detection [18], [19], and (d) quadratureamplitude modulation (QAM) with coherent detection [20]. We argue that at spectral efficiencies below 1 b/s/Hz per polarization, binary PAM (OOK) and binary DPSK are attractive options.…”

mentioning

confidence: 99%

Spectral Efficiency Limits and Modulation/Detection Techniques for DWDM Systems

Kahn

2004

IEEE J. Select. Topics Quantum Electron.

289

147

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“…Multi-level modulation formats, such as differential quadrature phase-shift keying (DQPSK), have been investigated to enhance spectral efficiency [1]. For further enhancement, such as that achievable using 8-PSK and beyond, synchronous homodyne detection using an absolute optical phase reference is required.…”

Section: Introductionmentioning

confidence: 99%

DGD- and dispersion-tolerance of QPSK self-homodyne detection based on a polarization-multiplexed pilot carrier

Nakamura

Kamio

Miyazaki

2009

IEICE Electron. Express

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Abstract:We experimentally investigated DGD-and dispersiontolerance of QPSK self-homodyne detection based on a polarizationmultiplexed pilot carrier for both NRZ and RZ data formats. The results show that the tolerance is large enough to be used in deployed network systems. We also investigated receiver sensitivity penalty versus the ratio of pilot-carrier power to total optical power. The ratio had a detunable margin of as large as ±15% at around the optimum point of 50%. Keywords: optical fiber communications, QPSK, self-homodyne, DGD, dispersion Classification: Fiber-optic communication [2] S. Norimatsu, K. Iwashita, and K. Noguchi, "An 8 Gb/s QPSK optical homodyne detection experiment using external-cavity laser diodes," IEEE Photon. Technol. Lett., vol. 4, no. 7, pp. 765-767, July 1992. [3] D.-S. Ly-Gagnon, K. Katoh, and K. Kikuchi, "Unrepeatered optical transmission of 20 Gbit/s quadrature phase-shift keying signals over 210 km using homodyne phase-diversity receiver and digital signal processing," References

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“…Recently, multi-level modulation formats such as differential quadrature phaseshift keying (DQPSK) have received increasing interest due to their high spectral efficiency and large tolerance to dispersion and differential group delay (DGD) [1]. However, multi-level modulation formats require a laser linewidth narrower than a few MHz for 10 Gsymbol/s [2].…”

Section: Introductionmentioning

confidence: 99%

20-Gbit/s QPSK self-homodyne transmission experiment using a multi-wavelength Fabry-Perot laser diode

Nakamura

Kamio

Miyazaki

2009

IEICE Electron. Express

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Abstract:We experimentally demonstrated phase-noise-tolerant 20-Gbit/s QPSK self-homodyne transmission over 80 km using a spectrumsliced lightwave from an inexpensive Fabry-Perot laser diode (FP-LD). We employed an optical phase-noise cancellation technique based on self-homodyne detection using a polarization-multiplexed pilot-carrier. A BER of < 10 −8 after 80-km transmission was successfully attained without using error correction. To the authors' best knowledge, this is the first experimental demonstration of multi-level modulation/demodulation using an FP-LD. Keywords: optical fiber communications, QPSK, self-homodyne, spectral slicing, Fabry-Perot laser diode Classification: Fiber-optic communication Lett., vol. 16, no. 3, pp. 930-932, March 2004. [3] T. Miyazaki, "Linewidth-tolerant QPSK homodyne transmission using a polarization-multiplexed pilot carrier," IEEE Photon. Technol. Lett., vol. 18, no. 2, pp. 388-390, Jan. 2006. [4] S. Norimatsu, K. Iwashita, and K. Noguchi, "An 8 Gb/s QPSK optical homodyne detection experiment using external-cavity laser diodes," IEEE Photon. Technol. Lett., vol. 4, no. 7, pp. 765-767, July 1992. [5] D.-S. Ly-Gagnon, K. Katoh, and K. Kikuchi, "Unrepeatered optical transmission of 20 Gbit/s quadrature phase-shift keying signals over 210 km using homodyne phase-diversity receiver and digital signal processing,"

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Optical differential quadrature phase-shift key (oDQPSK) for high capacity optical transmission

Cited by 215 publications

References 3 publications

Spectral Efficiency Limits and Modulation/Detection Techniques for DWDM Systems

Spectral Efficiency Limits and Modulation/Detection Techniques for DWDM Systems

DGD- and dispersion-tolerance of QPSK self-homodyne detection based on a polarization-multiplexed pilot carrier

20-Gbit/s QPSK self-homodyne transmission experiment using a multi-wavelength Fabry-Perot laser diode

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