100 Gbaud PAM4 link without EDFA and post-equalization for optical interconnects

Ozoliņš, Oskars; Zhang, Lu; Udaļcovs, Aleksejs; Louchet, Hadrien; Dippon, Thomas; Gruen, Markus; Pang, Xiaodan; Schatz, Richard; Westergren, Urban; Xiao, Shilin; Popov, Sergei; Chen, Jiajia

doi:10.1049/cp.2019.0991

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…For a maximum pre-FEC BER of 4%, an FEC code leads to a 27% bit overhead and hard-decision (HD) decoding is assumed to be used to achieve an error-free communication, whereas a maximum pre-FEC BER of 0.38% only requires 7% overhead. 45 In our case, the optimal results in terms of data rate are obtained for 27% HD-FEC, but a larger overhead introduces more latency because it requires a more complex decoding. For every experiment, we present the gross data rates in the text and the corresponding net bit rates in Table 1 after subtracting the FEC (7% or 27%) and the pilot sequences (5%) overheads.…”

Section: Data Transmission Using External Modulatormentioning

confidence: 69%

“…However, FEC implies a rate reduction due to the introduction of redundancy bits in data frames. For a maximum pre-FEC BER of 4%, an FEC code leads to a 27% bit overhead and hard-decision (HD) decoding is assumed to be used to achieve an error-free communication, whereas a maximum pre-FEC BER of 0.38% only requires 7% overhead 45 . In our case, the optimal results in terms of data rate are obtained for 27% HD-FEC, but a larger overhead introduces more latency because it requires a more complex decoding.…”

Section: Data Transmission Using External Modulatormentioning

confidence: 99%

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High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

et al. 2022

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. Free-space optical communication is a very promising alternative to fiber communication systems, in terms of ease of deployment and costs. Midinfrared light has several features of utter relevance for free-space applications: low absorption when propagating in the atmosphere even under adverse conditions, robustness of the wavefront during long-distance propagation, and absence of regulations and restrictions for this range of wavelengths. A proof-of-concept of high-speed transmission taking advantage of intersubband devices has recently been demonstrated, but this effort was limited by the short-distance optical path (up to 1 m). In this work, we study the possibility of building a long-range link using unipolar quantum optoelectronics. Two different detectors are used: an uncooled quantum cascade detector and a nitrogen-cooled quantum well-infrared photodetector. We evaluate the maximum data rate of our link in a back-to-back configuration before adding a Herriott cell to increase the length of the light path up to 31 m. By using pulse shaping, pre- and post-processing, we reach a record bitrate of 30 Gbit s − 1 for both two-level (OOK) and four-level (PAM-4) modulation schemes for a 31-m propagation link and a bit error rate compatible with error-correction codes.

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Section: Data Transmission Using External Modulatormentioning

confidence: 69%

Section: Data Transmission Using External Modulatormentioning

confidence: 99%

High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

et al. 2022

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“…The target BER determines the relevant FEC, which is characterized by its category, overhead length and decoding process. Continuous progress in FEC allows now getting rid of errors for a BER limit as high as 4 × 10 −2 [37], that is called critical BER value in the following. This limit will be used to determine the maximum data rate when increasing the optical attenuation and when applying optical feedback.…”

Section: A Transmission Results With Qclmentioning

confidence: 99%

Free-Space Communication With Directly Modulated Mid-Infrared Quantum Cascade Devices

Spitz

Didier

Durupt

et al. 2022

IEEE J. Select. Topics Quantum Electron.

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This study deals with the communication capabilities of two kinds of semiconductor lasers emitting in one of the atmosphere transparency windows, around 4 µm. One of these two lasers is a quantum cascade laser and the other one is an interband cascade laser. With the quantum cascade laser, a subsequent attenuation is added to the optical path in order to mimic the attenuation of free-space transmission of several kilometers. Direct electrical modulation is used to transmit the message and two-level formats, non-return-to-zero and return-to-zero, are used and compared in terms of maximum transmission data rate. The sensitivity to optical feedback is also analyzed, as well as the evolution of the error rate when reducing the optical power at the level of the detector. This work provides a novel insight into the development of future secure free-space optical communication links based on midinfrared semiconductor lasers and sheds the light on improvements required to achieve multi-Gbits/s communication with off-the-shelf components.

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“…Hence, there will not be such a large feedback (−9 dB) in short-distance data transmission, so the actual BER will perform better at a 6 Gbps modulation rate and will be less than 10 -8 . Furthermore, the silicon-based quantum dot laser still meets the KP4 forward error correction-certified BER of 2 × 10 -4 at 6 Gbps rates and strong feedback [19].…”

Section: High-speed Characteristicsmentioning

confidence: 99%

Reflection sensitivity of InAs/GaAs epitaxial quantum dot lasers under direct modulation

Ding

Dong

Huang

et al. 2022

Electronics Letters

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This paper reports on the reflection sensitivity under direct modulation operation of a 1.3 μm InAs/GaAs quantum dot laser that is epitaxially grown on silicon. The quantum dot laser exhibits a high tolerance to back reflections with low error transmission at 6 Gbps. This study paves the way for developing directly modulated isolator‐free photonic integrated circuits based on quantum dot lasers.

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100 Gbaud PAM4 link without EDFA and post-equalization for optical interconnects

Abstract: We achieve 300 Gbps line rate transmission with 100 Gbaud PAM8 over 400 meters of SSMF in C-band. We also demonstrate 100 Gbaud PAM4 400 meters link below the 7% HD-FEC limit of 5•10 -3 without optical amplification and post-equalization.

Cited by 8 publications

References 17 publications

High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

High-capacity free-space optical link in the midinfrared thermal atmospheric windows using unipolar quantum devices

Free-Space Communication With Directly Modulated Mid-Infrared Quantum Cascade Devices

Reflection sensitivity of InAs/GaAs epitaxial quantum dot lasers under direct modulation

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