Technologies for Cost-Effective udWDM-PONs

Prat, Josep; Cano, Nilo F.; Presi, M.; Tomkos, Ioannis; Klonidis, Dimitrios; Vall-llosera, Gemma; Brenot, R.; Pous, R.; Παπαστεργίου, Γεώργιος; Rafel, Albert; Ciaramella, E.

doi:10.1109/jlt.2015.2499381

Cited by 64 publications

(33 citation statements)

References 33 publications

(41 reference statements)

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“…With these results, we dimension the UDWDM-PON considering the PtP WDM wavelength band for NGPON2 (1603 nm -1625 nm) [9] However, it is important to consider the eye safety frontier (21.3 dBm [1]). With this value in mind, the emitted power per channel should be limited to only -6 dBm.…”

Section: Resultsmentioning

confidence: 99%

“…Motivated by the need of high spectral efficiency and aggregated capacity, coherent ultra-dense wavelength division multiplexing (UDWDM) solutions have gained interest [1,2]. These systems are attractive because they can inherently filter the optical signal by selecting the wavelength, and provide higher sensitivities compared with direct detection thus avoiding optical amplifiers [3].…”

Section: Introductionmentioning

confidence: 99%

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1.25–2.5 Gb/s Simple Nyquist Transmitters for Coherent UDWDM-PON with Enhanced Spectral Efficiency

Velasquez

Tabares

Cano

et al. 2018

Fiber and Integrated Optics

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A coherent ultra-dense wavelength division multiplexing passive optical network (UDWDM-PON) with high spectral efficiency is experimentally tested. The transmitters consist of directly phase modulated distributed feedback (DFB) lasers through beat signals whose duty-cycle and amplitude are digitally adjusted. The benefit of using Gaussian or Nyquist pulse-shaping filters at the transmitter is evaluated through numerical simulations and experiments. The results show that transmitting a Nyquist-shaped signal achieves a 25% spectral saving allowing to place 2.5 Gb/s/user data in 6.25 GHz channels. The proposed transmitter tolerates differential link-losses of 15 dB with Rx sensitivity of -44 dBm at BER=10 -3 with intradyne detection.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

1.25–2.5 Gb/s Simple Nyquist Transmitters for Coherent UDWDM-PON with Enhanced Spectral Efficiency

Velasquez

Tabares

Cano

et al. 2018

Fiber and Integrated Optics

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“…3. The transmitter (Tx) implemented a DFB laser ( = 1550 nm) with spectral linewidth ∆ = 4 MHz, emitting at 0 dBm, that was properly equalized by a high-pass RC network for direct 0-180º PSK modulation [4]. Data consisted of non-return-to-zero pseudo random binary sequences (NRZ-PRBS) from a pulse-pattern generator (PPG) running at 1.25 Gb/s.…”

Section: Real-time Experimental Setupmentioning

confidence: 99%

“…This translates into reducing the energy consumption and complexity of the optical network units (ONUs) at most. To fulfill the requirements of the access networks, efforts in research are being taken to develop the Gigabit-to-the-user concept towards user bandwidths in excess of 1 Gb/s, but enhancing the spectral efficiency by allocating hundreds of wavelengths in ultra-dense grid configuration [4]- [6]. For instance, the research involved in [7] aimed to implement a cost-effective ultra-dense wavelength division multiplexing passive optical network (udWDM-PON) exploiting coherent detection with user terminals based on commercial low-cost devices and low-complexity techniques.…”

Section: Introductionmentioning

confidence: 99%

Simplified Carrier Recovery for Intradyne Optical PSK Receivers in udWDM-PON

Tabares

Ghasemi

Polo

et al. 2018

J. Lightwave Technol.

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We present an optimized carrier recovery architecture based on differential detection for coherent optical receivers that substantially reduces the required DSP hardware resources, aimed to cost-effective transceivers for access networks applications. The proposed architecture shares the 1-symbol complex correlation required for differential phase detection within both the frequency estimation and the phase recovery blocks of the receiver DSP, thus lowering the energy consumption of the digital coherent receiver and increasing the tolerance against fast wavelength drifts of the lasers. We prototyped the proposed carrier recovery in a commercial FPGA for real-time evaluation with DPSK data at 1.25 Gb/s. The optical transmission system implemented direct-phase modulation of commercial DFB lasers, 25 km of single-mode fiber, and a coherent intradyne receiver with low-cost optical front-end based on 3x3 coupler and three photodiodes providing phase-diversity operation. Results show high performance in real-time for DPSK, achieving-55 dBm sensitivity at BER = 10-3 in a 6.25 GHz spaced ultra-dense WDM grid, high tolerance to optical phase noise, and enhanced mitigation of the fast wavelength drifts from lasers enabled by feed-forward DSP correction and feedback LO automatic tuning.

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“…25, allowing full coexistence with all legacy systems. When the coherent detection is employed, crosstalk interaction between COCONUT and the other PON systems is reduced, especially when using PSK or FSK modulation, thus the guard bands can be narrowed [34].…”

Section: B Wavelength Planmentioning

confidence: 99%