Coherent Systems for Low-Cost 10 Gb/s Optical Access Networks

Artiglia, M.; Corsini, R.; Presi, M.; Bottoni, F.; Cossu, G.; Ciaramella, E.

doi:10.1109/jlt.2015.2433952

Cited by 23 publications

(14 citation statements)

References 24 publications

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“…In order to simplify the coherent transceiver architectures for both OLT and ONU using PI receivers, several works have been reported in [34]- [39]. As shown in [34] by means of extensive numerical simulations, a polarization-diversity detector scheme for a broadcast network based on 2 × 1 multiple-inputmultiple-output (MIMO) orthogonal frequency-division multiplexing OFDM system has been investigated theoretically.…”

Section: Coherent Access Architecturesmentioning

confidence: 99%

Coherent Access: A Review

Shahpari

Ferreira

Luís

et al. 2017

J. Lightwave Technol.

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In this paper, we will address the benefits of the coherent detection in future optical access networks. The scarcity of the optical spectrum, the required flexibility, and constant evolution of requirements highlight the effectiveness of coherent techniques toward the future passive optical networks (PON). A set of architectures for coherent optical access networks will be presented and the key attributes of each scenario will be investigated. In addition, as a basis to decrease the cost of the local oscillator (LO) at customer side, we experimentally investigate the possibility of using a low-cost laser as LO with real-time detection of a Nyquistshaped differential quadrature phase-shift keying (DQPSK) signal using simple 8-bit digital signal processing (DSP) on a fieldprogrammable gate array. Moreover, we experimentally derive a set of optimized parameters and their impact on the network operation for coherent ultradense wavelength-division multiplexing (UDWDM) systems. The balance between the number of channels, power budget, and dynamic power range will be evaluated. Furthermore, we demonstrate a reconfigurable real-time receiver DSP for future flexible UDWDM-PON systems applying the DQPSK and D8PSK modulation formats. By reviewing some of the motivations for this technology, such as flexibility, spectral efficiency, as well as compatibility with software-defined networking, we show that this technology is approaching the required maturity.

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Section: Coherent Access Architecturesmentioning

confidence: 99%

Coherent Access: A Review

Shahpari

Ferreira

Luís

et al. 2017

J. Lightwave Technol.

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“…COCONUT project has explored different solution for coherent ONUs. COCONUT receiver is based on simple 3x3 fiber couple with polarization independent operation [78] or simplified polarization heterodyne receivers [79]. COCONUT transmitters are based on Distributed Feed-Back (DFB) lasers which can operate as ASK mode [78] or DPSK mode [79].…”

Section: Flat Optical Core Networkmentioning

confidence: 99%

Passive Optical Networks: Introduction

Altabás

Sarmiento

Lazaro

2018

Wiley Encyclopedia of Electrical and Electronics Engineering

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Passive optical networks (PONs) are telecommunication networks that provide services to users by no active elements. Only passive elements are used in the network to transmit the information and signals between users as well as between users and the companies operating the telecommunication networks.PONhave evolved from their infancy as fine and economical ideas, toward a long‐term, reliable, and cost‐effective technical solutions for providing access to most users to high‐speed Internet by Fiber‐to‐the‐Home (and similar) solutions.PONare still evolving, providing the base of multiple standardized networks and in combination with different technologies are growing into metropolitan networks and extensions of mobile communications.Herein, we overview the state of the art of passive optical networks as well as their basic concepts. This work is divided into four sections: In Section 1, we give a summary of the main concepts of passive optical networks. Sections 2 and 3 introduce the most important features ofITU‐TRecommendations andIEEEStandards for passive access networks, respectively. Finally, Section 4 concludes the article with an overview on the future trends ofPONsfor access networks.

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“…A LO laser enters at 45 o to a PBS, splitting it into two orthogonal components with the same amplitude, and the incoming signal is sent directly to one of the photodiodes. It has been experimentally demonstrated for 1.25 and 10 Gb/s LR WDM-PONs using amplitude-shift keying (ASK) signalling, providing loss budgets of 48 dB and 38 dB at a transmission distance over 66 km standard single-mode fiber (SSMF) in [17] and [18], respectively. The main advantage of this low-cost receiver is that the signal can be demodulated using basic analogue processing requiring no DSP or ADC.…”

Section: Low-cost Coherent Solutions For Lr-ponsmentioning

confidence: 99%

“…Note that the channel estimation for the Alamouti-coded OFDM signal was achieved using an Alamouti decoder [22]. Finally, the BER was estimated by error counting over 2 18…”

Section: Receiver Dspmentioning

confidence: 99%

See 1 more Smart Citation

Polarization-Insensitive Single-Balanced Photodiode Coherent Receiver for Long-Reach WDM-PONs

Erkılınç

Lavery

Shi

et al. 2016

J. Lightwave Technol.

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In an access network based on a passive optical network architecture, coherent detection is attractive since it allows for high receiver sensitivity coupled with inherent frequency selectivity. Nevertheless, solutions employed in core networks are prohibitively complex and costly, requiring the optical complexity of the coherent receivers to be reduced to make them feasible for access networks. For monolithic integration, a key challenge is posed by the polarization beam splitter (PBS). If however the PBS is removed, the receiver needs to be re-designed to be insensitive to the incoming polarization state of the received signal. In this paper, we experimentally demonstrate a polarization-insensitive (i.e., polarization-independent) coherent receiver for the optical network unit (ONU) in passive optical networks (PONs). The receiver consists of only a 3 dB coupler and a single balanced photodiode (BPD) such that the complexity is comparable to a direct detection receiver. The proposed cost-effective coherent receiver is implemented by using the Alamouti polarizationtime block coding (PTBC) scheme combined with heterodyne detection. To verify the technique, the Alamouti-coded OFDM signal is rotated over the full Poincaré sphere. Compared to the DP-OFDM signal operating at a net bit rate of 10 Gb/s per polarization (a gross bit rate of 10.7 Gb/s including a 7% FEC overhead), only a 0.6 dB sensitivity degradation is observed. The sensitivity at the FEC threshold, assumed to be 4 × 10 −3 , is measured to be -41.5 dBm (56 photons-per-bit) on a 25-GHz grid. Following this, different channel spacings are investigated and, the signal is transmitted over 80 km of standard single mode fiber (SSMF) in a long-reach (LR) wavelength division multiplexed (WDM) PON system. The loss budgets are found to be 43.0 dB and 42.8 dB for 50-and 25-GHz grids, respectively.Index Terms-Optical access, coherent detection, polarization, Alamouti, polarization-time block code (PTBC), wavelength division multiplexing (WDM), passive optical network (PON).

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Coherent Systems for Low-Cost 10 Gb/s Optical Access Networks

Cited by 23 publications

References 24 publications

Coherent Access: A Review

Coherent Access: A Review

Passive Optical Networks: Introduction

Polarization-Insensitive Single-Balanced Photodiode Coherent Receiver for Long-Reach WDM-PONs

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