Accurate wavelength drift measurements of NGPON2 tunable lasers candidates

Simon, Gerhard; Saliou, Fabienne; Chanclou, Philippe; Guyader, Bertrand Le; Guillo, Laurent; Erasme, Didier

doi:10.1109/ecoc.2015.7341823

Cited by 3 publications

(8 citation statements)

References 3 publications

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“…Several methods were proposed to verify the accuracy of the spectral measurements of the wavelength drift [5], [10]- [16]. Assuming this effect to be time-related, most of these methods are based on time-resolved measurements, such as the periodic filter method presented in [12].…”

Section: Time-domain Wavelength Drift Measurements Methods For Dmentioning

confidence: 99%

“…When containing data, the intensity steps between ones and zeros will be captured as well as instantaneous frequency variation between the same ones and zeros (see Fig. 3) resulting from the laser chirped modulation [7]- [10]. A variant of this setup, only using a unique photodiode and few passive optical components was presented in [10].…”

Section: B Heterodyne Detection Methodsmentioning

confidence: 99%

“…3) resulting from the laser chirped modulation [7]- [10]. A variant of this setup, only using a unique photodiode and few passive optical components was presented in [10].…”

Section: B Heterodyne Detection Methodsmentioning

confidence: 99%

“…The heterodyne detection method allows a wide observation range (O and C bands) with a high accuracy. Time resolution can be lower than the bit duration at 10Gb/s [10], [11]). However, its main drawback is the relatively complex offline processing.…”

Section: Comparison Of the Methodsmentioning

confidence: 99%

“…We propose here a synthesis of our previous works on the time-dependent wavelength drift of DMLs under burst-mode operation for TWDM [10], [11] with a complementary description of drift measurements methods and new results. The ITU-T recommendations are recalled in Section II and compared to the spectral measurements done on a precommercial TWDM NG-PON2 system.…”

Section: Introductionmentioning

confidence: 99%

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Focus on Time-Dependent Wavelength Drift of DMLs Under Burst-Mode Operation for NG-PON2

Simon

Saliou

Chanclou

et al. 2016

J. Lightwave Technol.

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Upstream time-dependent wavelength drift of Directly Modulated Lasers (DMLs) under burst-mode operation is measured on a Second Next Generation Passive Optical Network (NG-PON2) pre-commercial system. A new measurement method is used to demonstrate that the ITU-T (International Telecommunication Union) recommendations on maximum wavelength drift excursion should be improved. Considering the proximity of the different wavelength channels in the ITU-T grid (down to 50GHz), the time-dependent wavelength drift of directly modulated optical emitters is shown to lead to communication degradation and may cause breakdowns. A way to mitigate this problem is proposed. Index Terms-Adiabatic chirp, direct modulation, heterodyne detection, second next generation passive optical network (NG-PON2), thermal chirp, time-dependent wavelength drift, time and wavelength division multiplexing (TWDM), time division multiplexing (TDM), wavelength division multiplexing (WDM).

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Section: Time-domain Wavelength Drift Measurements Methods For Dmentioning

confidence: 99%

Section: B Heterodyne Detection Methodsmentioning

confidence: 99%

“…3) resulting from the laser chirped modulation [7]- [10]. A variant of this setup, only using a unique photodiode and few passive optical components was presented in [10].…”

Section: B Heterodyne Detection Methodsmentioning

confidence: 99%

Section: Comparison Of the Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Focus on Time-Dependent Wavelength Drift of DMLs Under Burst-Mode Operation for NG-PON2

Simon

Saliou

Chanclou

et al. 2016

J. Lightwave Technol.

Self Cite

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Fast-Convergence Digital Signal Processing for Coherent PON Using Digital SCM

Wang

Zhou

Xing

et al. 2023

J. Lightwave Technol.

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Optical access networks have been evolving to meet the explosive growth of data traffic. It is foreseeable that the 100Gb/s/λ and beyond passive optical network (PON) will be required in future optical access networks. Coherent optical communication is a promising solution for the future beyond 100G PON. However, the traditional digital signal processing (DSP) for coherent optical communication is difficult to realize fast convergence due to blind and complex algorithms. In this paper, we design a specific preamble structure and propose a burst-mode DSP to achieve fast convergence for the coherent PON. For verifying the feasibility of the proposed scheme, pointto-multi-point (P2MP) coherent PON is experimentally built up based on digital subcarrier multiplexing (DSCM), which is a kind of frequency division multiple access. When the allocated frequency of the optical network unit is suddenly changed, the DSP should converge fast to ensure a low handoff latency. In P2MP coherent PON, the proposed specific preamble structure and burst-mode DSP jointly implement the fast convergence using a short preamble with only 416 symbols. The experimental results show that the 8-Gbaud/SC×8-SCs 400Gb/s-net-rate coherent PON in burst-mode detection achieves the receiver sensitivity of approximately −27dBm at the 20% soft-decision forward error correction limit and approximately 35.5dB optical power budget with an optical pre-amplifier.

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Fast-Convergence Digital Signal Processing for Coherent PON using Digital SCM

Wang¹,

Zhou²,

Xing³

et al. 2023

Preprint

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<p>It is foreseeable that the 100 Gb/s/λ and beyond passive optical network (PON) will be required in future optical access networks to meet the explosive growth of data traffic. The coherent optical systems could be a promising solution for the future beyond 100G PON. Coherent PON using digital subcarrier multiplexing (DSCM) can provide flexible bandwidth allocation to a large number of access subscribers by dividing subcarriers of the DSCM signal into time slots for time-and-frequency division multiple access. When the optical network unit is allocated a new subcarrier, digital signal processing (DSP) should converge fast in the allocated time slot to ensure a low handoff latency for real-time bandwidth allocation. However, the traditional coherent DSP is hard to realize fast convergence due to blind and complex algorithms. In this paper, we design a specific training sequence (TS) structure and propose data-aided DSP to achieve fast convergence for coherent PON. The feasibility of the proposed scheme is experimentally verified in an 8 Gbaud/SC×8 SCs 400 Gb/s-net-rate coherent PON using DSCM with 16 quadrature amplitude modulation. The experimental results show that fast convergence is jointly realized by the proposed TS structure and data-aided DSP using a 416-symbol TS with a 52 ns duration. The receiver sensitivity at the 20% soft-decision forward error correction limit is approximately −27 dBm and an optical power budget of about 35.5 dB is achieved with a booster amplifier.</p>

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Accurate wavelength drift measurements of NGPON2 tunable lasers candidates

Cited by 3 publications

References 3 publications

Focus on Time-Dependent Wavelength Drift of DMLs Under Burst-Mode Operation for NG-PON2

Focus on Time-Dependent Wavelength Drift of DMLs Under Burst-Mode Operation for NG-PON2

Fast-Convergence Digital Signal Processing for Coherent PON Using Digital SCM

Fast-Convergence Digital Signal Processing for Coherent PON using Digital SCM

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