Coherent ultra dense wavelength division multiplexing passive optical networks

Shahpari, Ali; Ferreira, Rui A. C.; Ribeiro, Vítor; Sousa, Andreia F.; Ziaie, Somayeh; Tavares, Ana P. M.; Vujičić, Zoran; Guiomar, Fernando P.; Reis, Jacklyn D.; Pinto, Armando N.; Teixeira, A.

doi:10.1016/j.yofte.2015.07.001

Cited by 29 publications

(10 citation statements)

References 56 publications

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“…The advantages provided by coherent reception for F-OAN have been widely reported by several research groups [14]- [45]. Due to its good ability to improve the receiver sensitivity and wavelength selectivity, an ODN power budget higher than 46 dB was obtained, together with an improvement in the number of the end-users in the system with dedicated WDM channels and data rates from 150 Mbit/s to 10 Gb/s and with a reach up to 100 km [15].…”

Section: Coherent Access Architecturesmentioning

confidence: 89%

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: 89%

Coherent Access: A Review

Shahpari

Ferreira

Luís

et al. 2017

J. Lightwave Technol.

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“…On the other hand, for the same bit rate, with DPSK modulation a spectral separation of 8.75 GHz was needed. Although the spectral efficiency was enough for our experiment, it could be enhanced by employing pulse shaping techniques [2]. Having verified the proper detection of the signals, the system was tested with a fiber link as long as 100 km.…”

Section: Resultsmentioning

confidence: 99%

“…FTER the decision of the full service access network (FSAN) committee for a time and wavelength division multiplexing (TWDM) as the second stage of the next generation passive optical networks (NG-PON2) standard, ultra-dense WDM (UDWDM) appears as a candidate for upcoming access network generations [1][2][3]. Though coherent UDWDM offers high sensitivity and coexistence with current PON deployments, the potential high cost and device complexity has limited its attractiveness to operators.…”

Section: Introductionmentioning

confidence: 99%

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DQPSK Directly Phase Modulated DFB for Flexible Coherent UDWDM-PONs

Cano

Lerín

Prat

2016

IEEE Photon. Technol. Lett.

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“…In Manuscript Color versions of one or more of these figures in this paper are available in the pdf version of this manuscript. addition to these requirements, the key constraints are costper-bit and compact footprint in such systems [1], [2]. The LR passive optical network (PON) architecture without midspan amplification is a promising cost-effective solution in which a local exchange can be replaced with a single fiber span of up to 100 km, consolidating backhaul and access spans.…”

Section: Introductionmentioning

confidence: 99%

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 ultra dense wavelength division multiplexing passive optical networks

Cited by 29 publications

References 56 publications

Coherent Access: A Review

Coherent Access: A Review

DQPSK Directly Phase Modulated DFB for Flexible Coherent UDWDM-PONs

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

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