Using directly modulated DFBs without power penalty in low‐cost and high‐power budget coherent access networks

Presi, M.; Corsini, R.; Artiglia, M.; Ciaramella, E.

doi:10.1049/el.2014.0096

Cited by 8 publications

(5 citation statements)

References 9 publications

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“…In Figure 11 in section 4.B.1 and PAM-4 in section 4.B.2, detected by the 3x3 homodyne RX single-polarization. These results very well match the results in [9] with NRZ using DMLs. The sensitivity penalty at BER = 10 -3 for PAM-4 with respect to NRZ, with ∆λ = 5 GHz, is about 12 dB in part by the Nyquist shaping and in part by the image-rejection at the RX that performs better as the IF increases, and is slightly worse for PAM-4.…”

Section: A Baseband Modulationsupporting

confidence: 88%

Demonstration of continuous multiple access with homodyne and image-rejection heterodyne coherent receivers using directly modulated laser transmitters

Masanas¹,

Tabares²,

Cano³

et al. 2023

J. Opt. Commun. Netw.

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This work presents a comprehensive set of experiments for the multipoint-to-point coherent passive optical network (PON), where the wavelength locking between the optical network unit (ONU) and optical line termination lasers is critical, especially if operating in burst mode. Here, we test the performance of continuous multiple access in a splitter-based PON with both an ultra-dense wavelength division multiplexing and RF-subcarrier multiplexing configuration, with simple distributed feedback (DFB) lasers along non-return to zero and pulse amplitude modulation of four levels. Most interestingly, we test a spectrally efficient heterodyne receiver with image-frequency rejection and polarization independence based on the 3×3 optical front-end. Two users at the same intermediate frequency are detected simultaneously avoiding image frequency interference while minimizing complexity, with transmissions of 2.5 Gb/s. We provide comparison with an asynchronous homodyne receiver. The achieved results demonstrate the feasibility of continuous multiple access using thermally controlled ONUs with conventional DFBs as an enhanced alternative to commercial time division multiplexing access.

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Section: A Baseband Modulationsupporting

confidence: 88%

Demonstration of continuous multiple access with homodyne and image-rejection heterodyne coherent receivers using directly modulated laser transmitters

Masanas¹,

Tabares²,

Cano³

et al. 2023

J. Opt. Commun. Netw.

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“…2), obtained by simply exploiting the 3 rd input of the 3x3 coupler [4]; this allows for polarization independence without resorting to complex solutions (polarization diversity, automatic polarization alignment etc.) d) demonstration of operation with directly-modulated laser sources (DML) up to 10 Gbit/s [5]; this feature is quickly summarized in Fig. 3, and it allows using cheaper and simpler transmitter at ONU.…”

Section: Key Resultsmentioning

confidence: 99%

Simple and effective solutions for low-cost coherent WDM-PON

Ciaramella

Bottoni

Corsini

et al. 2015

2015 International Conference on Photonics in Switching (PS)

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This paper presents the most significant results achieved in the last two years by our group in coherent ultra-dense-WDM PON for λ-to-the-user access. Here we mostly focus on the architectures based on simple OOK-NRZ modulation format. We demonstrated the real-time implementation of our coherent receiver and we proved its compatibility with direct modulated laser (DML). Receiver sensitivities as low as -48 dBm at BER=1·10-3 for 1.25 Gb/s has been observed, showing the feasibility of a coherent ONU receiver based on devices commonly available and with limited cost. The system support quite high ODN losses and allows the λ-to-the-user approach

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“…The ASK signal envelope was recovered by squaring and summing the three i k s via software in the RTO (as shown in Fig. 2) [6], [11], [12]. The bit error ratio (BER) was computed off-line comparing bit-by-bit the received sequence against the transmitted one by means of an ad hoc SW routine run by the RTO processor.…”

Section: Experimental Set-upmentioning

confidence: 99%

“…Recently, we demonstrated a cost-effective coherent envelope detection scheme enabling the use of directly modulated (DM) lasers with adiabatic chirp in Wavelength Division Multiplexed (WDM) PON access networks at 1.25 or 2.5 Gb/s per channel [6]. A 120°hybrid consisting of a commercial 3 Â 3 fused fiber coupler was used in the coherent receiver to implement phase diversity, and commercial low cost DFBs were used as transmitter and local oscillator (LO) lasers.…”

Section: Introductionmentioning

confidence: 99%

10-Gb/s Long-Reach PON System With Low-Complexity Dispersion-Managed Coherent Receiver

et al. 2015

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We demonstrate 10-Gb/s transmission over more than 130 km of G.652 fiber using a simple directly modulated distributed feedback (DFB) laser and a new “chirp-managed” approach based on a low-complexity coherent receiver. The “chirp-managed” effect, which has been obtained in the past by optical spectral reshaping, is conveniently achieved here by means of simple electrical filtering of the received signal at the intermediate frequency. Due to coherent detection, the receiver sensitivity was -38 dBm at bit error rate (BER) 1/4 1.8 χ 10-3. No colored filters and no dispersion compensation (optical or digital signal processing (DSP)-based) were used at the receiver side. We show that the coherent system presented here, based on off-the-shelf components, is robust against variations of DFB chirp, local oscillator detuning, and electrical filter bandwidth over ranges wide enough to guarantee a simple and cost-effective implementation for 10-Gb/s long-reach passive optical network applications

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Using directly modulated DFBs without power penalty in low‐cost and high‐power budget coherent access networks

Cited by 8 publications

References 9 publications

Demonstration of continuous multiple access with homodyne and image-rejection heterodyne coherent receivers using directly modulated laser transmitters

Demonstration of continuous multiple access with homodyne and image-rejection heterodyne coherent receivers using directly modulated laser transmitters

Simple and effective solutions for low-cost coherent WDM-PON

10-Gb/s Long-Reach PON System With Low-Complexity Dispersion-Managed Coherent Receiver

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