Numerical and experimental study on the impact of chromatic dispersion
on O-band direct-detection transmission

Yang Hong; Kyle R. H. Bottrill; Natsupa Taengnoi; Naresh K. Thipparapu; Yu Wang; Jayanta K. Sahu; David J. Richardson; Periklis Petropoulos

doi:10.1364/AO.424962

Applied Optics
Vol. 60,
Issue 15,
pp. 4383-4390
(2021)
•https://doi.org/10.1364/AO.424962

Numerical and experimental study on the impact of chromatic dispersion on O-band direct-detection transmission

Yang Hong, Kyle R. H. Bottrill, Natsupa Taengnoi, Naresh K. Thipparapu, Yu Wang, Jayanta K. Sahu, David J. Richardson, and Periklis Petropoulos

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Yang Hong, Kyle R. H. Bottrill, Natsupa Taengnoi, Naresh K. Thipparapu, Yu Wang, Jayanta K. Sahu, David J. Richardson, and Periklis Petropoulos, "Numerical and experimental study on the impact of chromatic dispersion on O-band direct-detection transmission," Appl. Opt. 60, 4383-4390 (2021)

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Table of Contents Category
- Fiber Optics, Fiber Sensors, and Optical Communications
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About this Article
History
- Original Manuscript: March 15, 2021
- Revised Manuscript: April 24, 2021
- Manuscript Accepted: April 26, 2021
- Published: May 17, 2021

Abstract

The recent emergence of efficient O-band amplification technologies has enabled the consideration of O-band transmission beyond short reach. Despite the O-band being a low chromatic dispersion (CD) window, the impact of CD will become increasingly significant when extending the reach of direct-detection (DD) systems. In this work, we first numerically investigate the 3-dB bandwidth of single-mode fibers (SMF) and the CD-restricted transmission reach in intensity-modulation DD systems, confirming the significant difference between low- and high-dispersion O-band wavelengths. We then carry out experimental transmission studies over SMF for distances of up to 70 km at two different wavelengths, the low-dispersion 1320 nm and the more dispersive 1360 nm, enabled by the use of an O-band bismuth-doped fiber amplifier as a preamplifier at the receiver. We compare three 50-Gb/s optical DD formats, namely, Nyquist on-off keying (OOK), Nyquist 4-ary pulse amplitude modulation (PAM4) and Kramers–Kronig detection-assisted single-sideband quadrature phase shift keying (KK-QPSK) half-cycle subcarrier modulation. Our results show that at both wavelengths, OOK and QPSK exhibit better bit error rate performance than PAM4. When transmitting over 70-km of SMF at the less dispersive wavelength of 1320 nm, 50-Gb/s OOK modulation offers more than 1.5-dB optical power sensitivity improvement at the photodiode (PD) compared to 50-Gb/s QPSK. Conversely, at 1360 nm, the required optical power to the PD can be reduced by more than 3 dB by using QPSK instead of OOK.

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Data Availability

Data underlying the results presented in this paper are available in Ref. [30].

30. Y. Hong, K. R. Bottrill, N. Taengnoi, N. K. Thipparapu, Y. Wang, J. K. Sahu, D. J. Richardson, and P. Petropoulos, “Numerical and experimental study on the impact of chromatic dispersion on O-band direct-detection transmission,” University of Southampton Institutional Repository, 2021, https://doi.org/10.5258/SOTON/D1813.

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	Reach
Format	10 km	20 km	35 km	50 km	70 km
PAM4	$1.1 \times 1 0^{- 2}$	$1.2 \times 1 0^{- 2}$	$1.4 \times 1 0^{- 2}$	$1.5 \times 1 0^{- 2}$	$4.8 \times 1 0^{- 2}$
OOK	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$1.5 \times 1 0^{- 4}$
QPSK	$2.3 \times 1 0^{- 4}$	$2.4 \times 1 0^{- 4}$	$3.7 \times 1 0^{- 4}$	$4.3 \times 1 0^{- 4}$	$2.3 \times 1 0^{- 3}$

	Reach
Format	10 km	20 km	35 km	50 km	70 km
PAM4	$2.6 \times 1 0^{- 2}$	$2.7 \times 1 0^{- 2}$	$2.9 \times 1 0^{- 2}$	$3.3 \times 1 0^{- 2}$	$6.6 \times 1 0^{- 2}$
OOK	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$4.7 \times 1 0^{- 4}$	$4.8 \times 1 0^{- 3}$	$2.2 \times 1 0^{- 2}$
QPSK	$6.8 \times 1 0^{- 4}$	$8 \times 1 0^{- 4}$	$1.3 \times 1 0^{- 3}$	$2.7 \times 1 0^{- 3}$	$7.8 \times 1 0^{- 3}$

	Reach
Format	10 km	20 km	35 km	50 km	70 km
PAM4	$1.1 \times 1 0^{- 2}$	$1.2 \times 1 0^{- 2}$	$1.4 \times 1 0^{- 2}$	$1.5 \times 1 0^{- 2}$	$4.8 \times 1 0^{- 2}$
OOK	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$1.5 \times 1 0^{- 4}$
QPSK	$2.3 \times 1 0^{- 4}$	$2.4 \times 1 0^{- 4}$	$3.7 \times 1 0^{- 4}$	$4.3 \times 1 0^{- 4}$	$2.3 \times 1 0^{- 3}$

	Reach
Format	10 km	20 km	35 km	50 km	70 km
PAM4	$2.6 \times 1 0^{- 2}$	$2.7 \times 1 0^{- 2}$	$2.9 \times 1 0^{- 2}$	$3.3 \times 1 0^{- 2}$	$6.6 \times 1 0^{- 2}$
OOK	$< 1 \times 1 0^{- 4}$	$< 1 \times 1 0^{- 4}$	$4.7 \times 1 0^{- 4}$	$4.8 \times 1 0^{- 3}$	$2.2 \times 1 0^{- 2}$
QPSK	$6.8 \times 1 0^{- 4}$	$8 \times 1 0^{- 4}$	$1.3 \times 1 0^{- 3}$	$2.7 \times 1 0^{- 3}$	$7.8 \times 1 0^{- 3}$

Abstract

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Applied Optics