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DD Transmissions using a Directly Modulated O-band DFB+R Laser targeting LR Applications
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  • Xiaodan Pang ,
  • Toms Salgals ,
  • Hadrien Louchet ,
  • Di Che ,
  • Markus Gruen ,
  • Yasuhiro Matsui ,
  • Thomas Dippon ,
  • Richard Schatz ,
  • Mahdieh Joharifar ,
  • Benjamin Krüger ,
  • Fabio Pittala ,
  • Yuchuan Fan ,
  • Aleksejs Udalcovs ,
  • Lu Zhang ,
  • Xianbin Yu ,
  • Sandis Spolitis ,
  • Vjaceslavs Bobrovs ,
  • Sergei Popov ,
  • Oskars Ozolins
Xiaodan Pang
KTH Royal Institute of Technology

Corresponding Author:[email protected]

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Toms Salgals
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Hadrien Louchet
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Markus Gruen
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Yasuhiro Matsui
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Thomas Dippon
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Richard Schatz
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Mahdieh Joharifar
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Benjamin Krüger
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Fabio Pittala
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Yuchuan Fan
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Aleksejs Udalcovs
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Xianbin Yu
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Sandis Spolitis
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Vjaceslavs Bobrovs
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Sergei Popov
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Oskars Ozolins
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We experimentally demonstrate an O-band single-lane 200 Gb/s intensity modulation direct detection (IM/DD) transmission system using a low-chirp, broadband, and high-power directly modulated laser (DML). The employed laser is an isolator-free packaged module with over 65-GHz modulation bandwidth enabled by a distributed feedback plus passive waveguide reflection (DFB+R) design. We transmit high baud rate signals over 20-km standard single-mode fiber (SSMF) without using any optical amplifiers and demodulate them with reasonably low-complexity digital equalizers. We generate and detect up to 170 Gbaud non-return-to-zero on-off-keying (NRZ-OOK), 112 Gbaud 4-level pulse amplitude modulation (PAM4), and 100 Gbaud PAM6 in the optical back-to-back configuration. After transmission over the 20-km optical-amplifier-free SSMF link, up to 150 Gbaud NRZ-OOK, 106 Gbaud PAM4, and 80 Gbaud PAM6 signals are successfully received and demodulated, achieving bit error rate (BER) performance below the 6.25%-overhead hard-decision (HD) forward-error-correction code (FEC) limit. The demonstrated results show the possibility of meeting the strict requirements towards the development of 200Gb/s/lane IM/DD technologies, targeting 800Gb/s and 1.6Tb/s LR applications.
01 Jun 2023Published in Journal of Lightwave Technology volume 41 issue 11 on pages 3635-3641. 10.1109/JLT.2023.3261421