Bidirectional single-fiber filterless optical networks: modeling and experimental assessment

Dimitris Uzunidis; Marco Presi; Andrea Sgambelluri; Francesco Paolucci; Francesco Paolucci; Alexandros Stavdas; Filippo Cugini

doi:10.1364/JOCN.411637

Journal of Optical Communications and Networking
Vol. 13,
Issue 6,
pp. C1-C9
(2021)
•https://doi.org/10.1364/JOCN.411637

Bidirectional single-fiber filterless optical networks: modeling and experimental assessment

Dimitris Uzunidis, Marco Presi, Andrea Sgambelluri, Francesco Paolucci, Alexandros Stavdas, and Filippo Cugini

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Dimitris Uzunidis, Marco Presi, Andrea Sgambelluri, Francesco Paolucci, Alexandros Stavdas, and Filippo Cugini, "Bidirectional single-fiber filterless optical networks: modeling and experimental assessment," J. Opt. Commun. Netw. 13, C1-C9 (2021)

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Abstract

This paper proposes, designs, and validates a filterless metro network employing bidirectional transmission over a single fiber. Transmission impairments, dominated by cross talk, are specifically estimated leveraging on what we believe to be novel closed-form expressions to determine optical reach, launch power, and number of supported cascaded nodes. Results show that extremely good transmission performance can be achieved and further improved when misalignment in spectrum allocation is configured among the two counter-propagating directions. This confirms that filterless metro networks employing bidirectional transmission over a single fiber represent an extremely attractive solution, particularly in the case of scarce fiber availability and when regulatory aspects impose a rent for any occupied fiber infrastructure.

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Dimitris Uzunidis	https://orcid.org/0000-0002-9993-5230
Francesco Paolucci	https://orcid.org/0000-0003-4821-5193
Filippo Cugini	https://orcid.org/0000-0002-9840-0365

Link Length [km]	OSNR [dB] 0.1 nm	Signal/Cross-Talk Ratio [dB]
20	27.6	$- 22$
30	27.2	$- 19.6$
40	26.7	$- 17.4$
50	26.4	$- 15.4$

	Modulation Format	Symbol Rate (Gbaud)	Channel Spacing (GHz)	Data Rate (Gb/s)	Required OSNIR (dB) ( $B E R = 10^{- 3}$ )	Maximum Number of Channels
100G	PM-QPSK	32	37.5	100	9.8	116
100G	PM-QPSK	32	50	100	9.8	87
200G	PM-16QAM	32	37.5	200	16.55	116
400G	PM-16QAM	63	75	400	16.55	58
400G	PM-64QAM	42	50	400	22.5	87

Parameter	Symbol	Value
Fiber attenuation	$a$	0.2 (dB/km)
Local dispersion	D	17 (ps/nm/km)
Non-linear coefficient	$γ$	1.3 (1/W/km)
Noise figure	NF	6 (dB)
Amplifier gain	G	$a \cdot L + 5 (d B)$
Inter-node distance	L	10, 20 (km)
Central wavelength	$λ$	1550 (nm)
Modulation format FWM dependence	$Φ$	1 for QPSK, 17/25 for 16QAM, 13/21 for 64QAM

	$L = 10 k m$		$L = 20 k m$
	$P_{o p t}$ (dBm)	OSNIR (dB)	$P_{o p t}$ (dBm)	OSNIR (dB)
100G-PM-QPSK (37.5 GHz)	$- 3$	25.9	$- 2$	24.1
100G-PM-QPSK (37.5 GHz)	$- 3$	26.0	$- 2$	24.2
200G-PM-16QAM (37.5 GHz)	$- 3$	25.2	$- 3$	23.6
400G-PM-16QAM (75 GHz)	$- 1$	$25.0$	0	$23.4$
400G-PM-64QAM (50 GHz)	$- 2$	$25.0$	$- 2$	$23.3$

Bidirectional single-fiber filterless optical networks: modeling and experimental assessment

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Abstract

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Figures (9)

Tables (4)

Equations (6)

Journal of Optical Communications and Networking