Optical differential phase shift keying (DPSK) direct detection considered as a duobinary signal

Penninckx, D.; Bissessur, H.; Brindel, P.; Gohin, E.; Bakhti, F.

doi:10.1109/ecoc.2001.989713

Cited by 43 publications

(31 citation statements)

References 4 publications

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“…1 can be understood by looking at the limit of the optimization process. When a DPSK signal is received without a delay interferometer, or equivalently an MZI with no relative delay between the two arms, and with strong filtering it can be directly detected as a duobinary signal [5]. When this is done balanced detection cannot be used and so the 3dB benefit from using DPSK is no longer present.…”

Section: Discussionmentioning

confidence: 99%

An RZ DPSK receiver design with significantly improved dispersion tolerance

Govan¹,

Doran²

2007

Opt. Express

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Abstract:We show an improved DPSK receiver design which can increase useful dispersion tolerance by up to a factor of two. The increased dispersion tolerance is achieved through optimization of the optical filter at the receiver and the delay of the Mach-Zehnder interferometer. In this paper we fully explain the concept, quantify the gain and provide an explanation for the operation of the receiver.

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Section: Discussionmentioning

confidence: 99%

An RZ DPSK receiver design with significantly improved dispersion tolerance

Govan¹,

Doran²

2007

Opt. Express

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“…Optical differential quadrature phase shift keying (DQPK) [132,[143][144][145][146][147] and duobinary modulation [148][149][150][151][152] are spectrally efficient modulation formats related to DPSK that have recently been considered for use over long-haul fiber links, where dispersion is often a dominant limitation. However, dispersion and channel bandwidth are generally not limiting factors in free-space links, so the combination of reduced photon-efficiency and increased complexity make these modulation formats less attractive than DPSK for use in free-space applications.…”

Section: Differential-phase-shift-keying (Dpsk)mentioning

confidence: 99%

Laser communication transmitter and receiver design

Caplan

2007

J Optic Comm Rep

118

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Free-space laser communication systems have the potential to provide flexible, high-speed connectivity suitable for long-haul intersatellite and deep-space links. For these applications, power-efficient transmitter and receiver designs are essential for cost-effective implementation. State-of-the-art designs can leverage many of the recent advances in optical communication technologies that have led to global wideband fiber-optic networks with multiple Tbit/s capacities. While spectral efficiency has long been a key design parameter in the telecommunications industry, the many THz of excess channel bandwidth in the optical regime can be used to improve receiver sensitivities where photon efficiency is a design driver. Furthermore, the combination of excess bandwidth and average-power-limited optical transmitters has led to a new paradigm in transmitter and receiver design that can extend optimized performance of a single receiver to accommodate multiple data rates. This paper discusses state-of-the-art optical transmitter and receiver designs that are particularly well suited for average-power-limited photon-starved links where channel bandwidth is readily available. For comparison, relatively simple direct-detection systems used in short terrestrial or fiber optic links are discussed, but emphasis is placed on mature high-performance photon-efficient systems and commercially available technologies suitable for operation in space. The fundamental characteristics of optical sources, modulators, amplifiers, detectors, and associated noise sources are reviewed along with some of the unique properties that distinguish laser communication systems and components from their RF counterparts. Also addressed is the interplay between modulation format, transmitter waveform, and receiver design, as well as practical tradeoffs and implementation considerations that arise from using various technologies.

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“…Similarly, regarding the I channel of information, ignoring the Id port instead of the Ic port presents better performance. Τhis feature can be justified by noting that the constructive output port is resembles a duobinary (DB) signal, while the destructive output port resembles an alternatingmark-inversion (AMI) signal [27,28]. The intrinsic high tolerance of the DB modulation format in chromatic dispersion originates from its narrow spectrum [29] and can explain the better performance of every equalizer when the constructive, rather than the destructive, port (of each channel) is maintained to undergo the process of equalization [30].…”

Section: Optical Layer Simulationmentioning

confidence: 99%

High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers

et al. 2017

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Optical transmission technologies optimized for optical network segments sensitive to power consumption and cost, comprise modulation formats with direct detection technologies. Specifically, non-return to zero differential quaternary phase shift keying (NRZ-DQPSK) in deployed fiber plants, combined with high-performance, low-complexity electronic equalizers to compensate residual impairments at the receiver end, can be proved as a viable solution for high-performance, high-capacity optical links. Joint processing of the constructive and the destructive signals at the single-ended DQPSK receiver provides improved performance compared to the balanced configuration, however, at the expense of higher hardware requirements, a fact that may not be neglected especially in the case of high-speed optical links. To overcome this bottleneck, the use of partially joint constructive/destructive DQPSK equalization is investigated in this paper. Symbol-by-symbol equalization is performed by means of Volterra decision feedback-type equalizers, driven by a reduced subset of signals selected from the constructive and the destructive ports of the optical detectors. The proposed approach offers a low-complexity alternative for electronic equalization, without sacrificing much of the performance compared to the fully-deployed counterpart. The efficiency of the proposed equalizers is demonstrated by means of computer simulation in a typical optical transmission scenario.

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Optical differential phase shift keying (DPSK) direct detection considered as a duobinary signal

Cited by 43 publications

References 4 publications

An RZ DPSK receiver design with significantly improved dispersion tolerance

An RZ DPSK receiver design with significantly improved dispersion tolerance

Laser communication transmitter and receiver design

High-Speed, High-Performance DQPSK Optical Links with Reduced Complexity VDFE Equalizers

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