Super-channel spectrum saving optimization procedure in elastic optical networks

Margita Radovic; Andrea Sgambelluri; Filippo Cugini; Nicola Sambo

doi:10.1364/JOCN.475596

Journal of Optical Communications and Networking
Vol. 15,
Issue 2,
pp. 68-77
(2023)
•https://doi.org/10.1364/JOCN.475596

Super-channel spectrum saving optimization procedure in elastic optical networks

Margita Radovic, Andrea Sgambelluri, Filippo Cugini, and Nicola Sambo

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Margita Radovic, Andrea Sgambelluri, Filippo Cugini, and Nicola Sambo, "Super-channel spectrum saving optimization procedure in elastic optical networks," J. Opt. Commun. Netw. 15, 68-77 (2023)

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Abstract

Optical networks have historically been overprovisioned for physical-layer conditions and capacity and, as such, operate uninterrupted over several years. By reducing system margins, network efficiency and cost savings could be improved without compromising network reliability. On the other hand, super-channel transmission has been identified as a suitable solution for supporting high-data-rate connectivity. NETCONF, along with YANG models, has been recognized as a software defined networking (SDN) configuration and management protocol enabling control in a vendor-neutral way. Moreover, the OpenConfig YANG model defines vendor-specific transmission parameters, such as modulation format and bit rate, within operational modes. This paper investigates the trade-off between super-channel quality of transmission (QoT) and spectrum saving by allowing slight subcarrier overlap and tight filtering, hence reducing system margins. An automatic spectrum-efficient super-channel optimization procedure is experimentally demonstrated using a 600 Gbit/s transponder in an SDN-controlled elastic optical network. The automatic procedure performs the adaptation of filter bandwidth and subcarrier spacing. The latter is effectively operated by transponder agents, without involving the SDN controller, thus reducing the margins while guaranteeing that the QoT enables savings of up to 25% of the spectrum.

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Equations (1)

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		80 km		160 km		240 km		320 km
		OP2	OP3	OP6	OP7	OP5	OP6	OP2	OP3	OP7
S [GHz]		500 Gb/s DP-QAM32 75 GHz	400 Gb/s DP-QAM16 75 GHz	200 Gb/s 8PSK 75 GHz	200 Gb/s DP-QAM16 50 GHz	300 Gb/s 8PSK-2 75 GHz	200 Gb/s 8PSK 75 GHz	500 Gb/s DP-QAM32 75 GHz	400 Gb/s DP-QAM16 75 GHz	200 Gb/s DP-QAM16 50 GHz
None	(0,0,0,0)	6.5E-3	4.3E-4	1.3E-7	2.3E-5	9.5E-5	1.2E-6		3.3E-3	1.9E-4
12.5	(1,0,0,1)	1.3E-2	1.4E-3	2.6E-7	4.3E-5	1.2E-4	1.4E-6	$>$ TH	6.9E-3	2.9E-4
	(0,1,1,0)	1.9E-2	9.4E-3	5.2E-7	1.0E-4	2.2E-4	2.7E-6	$>$ TH	2.4E-2	5.8E-4
25	(2,0,0,2)			1.0E-6	8.1E-4	3.5E-4	9.6E-6	$>$ TH	2.3E-2	5.4E-3
	(1,1,1,1)	2.3E-2	2.2E-2	3.8E-7		2.4E-4	1.9E-6	$>$ TH
	(0,2,2,0)	$>$ TH	$>$ TH	4.9E-4	$>$ TH	9.7E-3	7.4E-4	$>$ TH	$>$ TH	$>$ TH
37.5	(3,0,0,3)	$>$ TH	$>$ TH	1.2E-3	$>$ TH	7.1E-3	8.3E-4	$>$ TH	$>$ TH	$>$ TH
	(2,1,1,2)	$>$ TH	$>$ TH		$>$ TH			$>$ TH	$>$ TH	$>$ TH
	(1,2,2,1)	$>$ TH	$>$ TH	2.0E-3	$>$ TH	2.2E-2	1.9E-3	$>$ TH	$>$ TH	$>$ TH

Bit Rate	Nominal Bandwidth		80 km		160 km		240 km		320 km
900 Gbit/s	150 GHz		Saving 25 GHz		Saving 25 GHz		Saving 18.75 GHz		Saving 12.5 GHz
			(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(1,0,0,2)	(0,1,1,1)	(0,0,0,2)
		OP2 OP3	2.4E-2 7.7E-3		$>$ TH 8.2E-4		2.3E-2 2.2E-3
800 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 18.75 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(1,0,0,3)	(0,1,1,2)	(0,0,0,3)
		OP2 OP5	2.2E-2 9.6E-5		$>$ TH 6.2E-5			2.2E-2 5.2E-4
700 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 25 GHz		Saving 18.75 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(1,0,0,3)	(0,1,1,2)	(0,0,0,3)
		OP2 OP6	2.2E-2 3.9E-7		$>$ TH 3.5E-7			2.0E-2 1.8E-6
700 Gbit/s	125 GHz		Saving 25 GHz		Saving 25 GHz		Saving 18.75 GHz		Saving 12.5 GHz
			(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(1,0,0,2)	(0,1,1,1)	(0,0,0,2)
		OP2 OP7	2.4E-2 1.8E-3		$>$ TH 1.5E-3			2.1E-2 3.7E-3
700 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)
		OP3 OP5		8.2E-3 8.2E-4		1.3E-2 2.5E-4		2.3E-2 2.4E-4		1.8E-2 1.5E-2
600 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)
		OP3 OP6		8.6E-3 8.5E-6		1.1E-2 1.5E-5		1.8E-2 4.4E-5	1.8E-2 2.5E-3
600 Gbit/s	125 GHz		Saving 25 GHz		Saving 25 GHz		Saving 25 GHz		Saving 25 GHz
			(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)
		OP3 OP7		2.3E-2 2.8E-3		2.1E-2 2.1E-3	$>$ TH 4.4E-3		2.3E-2 4.0E-3
500 Gbit/s	150 GHz		Saving 37.5 GHz		Saving 37.5 GHz		Saving 37.5 GHz		Saving 37.5 GHz
			(3,0,0,3)	(2,1,1,2)	(3,0,0,3)	(2,1,1,2)	(3,0,0,3)	(2,1,1,2)	(3,0,0,3)	(2,1,1,2)
		OP5 OP6	1.1E-2 9.0E-8		$>$ TH 3.0E-7		1.6E-2 2.0E-6		1.9E-2 2.9E-5
500 Gbit/s	125 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)
		OP5 OP7	1.6E-3 7.1E-4		$>$ TH 2.9E-3		2.1E-2 1.2E-3		1.9E-2 1.4E-2
400 Gbit/s	125 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)
		OP6 OP7	2.4E-4 4.6E-4		4.9E-4 2.1E-3		1.0E-4 1.3E-3		2.8E-3 6.1E-3

	Adjacent Channel	Left-Hand Subcarrier	Right-Hand Subcarrier
(a)	2.33E-7	1.57E-6	4.98E-6
(b)	2.03E-7	3.79E-4	7.7E-4
(c)	5.89E-7	5.52E-4	3.03E-4

		80 km		160 km		240 km		320 km
		OP2	OP3	OP6	OP7	OP5	OP6	OP2	OP3	OP7
S [GHz]		500 Gb/s DP-QAM32 75 GHz	400 Gb/s DP-QAM16 75 GHz	200 Gb/s 8PSK 75 GHz	200 Gb/s DP-QAM16 50 GHz	300 Gb/s 8PSK-2 75 GHz	200 Gb/s 8PSK 75 GHz	500 Gb/s DP-QAM32 75 GHz	400 Gb/s DP-QAM16 75 GHz	200 Gb/s DP-QAM16 50 GHz
None	(0,0,0,0)	6.5E-3	4.3E-4	1.3E-7	2.3E-5	9.5E-5	1.2E-6		3.3E-3	1.9E-4
12.5	(1,0,0,1)	1.3E-2	1.4E-3	2.6E-7	4.3E-5	1.2E-4	1.4E-6	$>$ TH	6.9E-3	2.9E-4
	(0,1,1,0)	1.9E-2	9.4E-3	5.2E-7	1.0E-4	2.2E-4	2.7E-6	$>$ TH	2.4E-2	5.8E-4
25	(2,0,0,2)			1.0E-6	8.1E-4	3.5E-4	9.6E-6	$>$ TH	2.3E-2	5.4E-3
	(1,1,1,1)	2.3E-2	2.2E-2	3.8E-7		2.4E-4	1.9E-6	$>$ TH
	(0,2,2,0)	$>$ TH	$>$ TH	4.9E-4	$>$ TH	9.7E-3	7.4E-4	$>$ TH	$>$ TH	$>$ TH
37.5	(3,0,0,3)	$>$ TH	$>$ TH	1.2E-3	$>$ TH	7.1E-3	8.3E-4	$>$ TH	$>$ TH	$>$ TH
	(2,1,1,2)	$>$ TH	$>$ TH		$>$ TH			$>$ TH	$>$ TH	$>$ TH
	(1,2,2,1)	$>$ TH	$>$ TH	2.0E-3	$>$ TH	2.2E-2	1.9E-3	$>$ TH	$>$ TH	$>$ TH

Bit Rate	Nominal Bandwidth		80 km		160 km		240 km		320 km
900 Gbit/s	150 GHz		Saving 25 GHz		Saving 25 GHz		Saving 18.75 GHz		Saving 12.5 GHz
			(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(1,0,0,2)	(0,1,1,1)	(0,0,0,2)
		OP2 OP3	2.4E-2 7.7E-3		$>$ TH 8.2E-4		2.3E-2 2.2E-3
800 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 18.75 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(1,0,0,3)	(0,1,1,2)	(0,0,0,3)
		OP2 OP5	2.2E-2 9.6E-5		$>$ TH 6.2E-5			2.2E-2 5.2E-4
700 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 25 GHz		Saving 18.75 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(1,0,0,3)	(0,1,1,2)	(0,0,0,3)
		OP2 OP6	2.2E-2 3.9E-7		$>$ TH 3.5E-7			2.0E-2 1.8E-6
700 Gbit/s	125 GHz		Saving 25 GHz		Saving 25 GHz		Saving 18.75 GHz		Saving 12.5 GHz
			(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(1,0,0,2)	(0,1,1,1)	(0,0,0,2)
		OP2 OP7	2.4E-2 1.8E-3		$>$ TH 1.5E-3			2.1E-2 3.7E-3
700 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)
		OP3 OP5		8.2E-3 8.2E-4		1.3E-2 2.5E-4		2.3E-2 2.4E-4		1.8E-2 1.5E-2
600 Gbit/s	150 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)	(2,0,0,3)	(1,1,1,2)
		OP3 OP6		8.6E-3 8.5E-6		1.1E-2 1.5E-5		1.8E-2 4.4E-5	1.8E-2 2.5E-3
600 Gbit/s	125 GHz		Saving 25 GHz		Saving 25 GHz		Saving 25 GHz		Saving 25 GHz
			(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)	(2,0,0,2)	(1,1,1,1)
		OP3 OP7		2.3E-2 2.8E-3		2.1E-2 2.1E-3	$>$ TH 4.4E-3		2.3E-2 4.0E-3
500 Gbit/s	150 GHz		Saving 37.5 GHz		Saving 37.5 GHz		Saving 37.5 GHz		Saving 37.5 GHz
			(3,0,0,3)	(2,1,1,2)	(3,0,0,3)	(2,1,1,2)	(3,0,0,3)	(2,1,1,2)	(3,0,0,3)	(2,1,1,2)
		OP5 OP6	1.1E-2 9.0E-8		$>$ TH 3.0E-7		1.6E-2 2.0E-6		1.9E-2 2.9E-5
500 Gbit/s	125 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)
		OP5 OP7	1.6E-3 7.1E-4		$>$ TH 2.9E-3		2.1E-2 1.2E-3		1.9E-2 1.4E-2
400 Gbit/s	125 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz		Saving 31.25 GHz
			(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)	(3,0,0,2)	(2,1,1,1)
		OP6 OP7	2.4E-4 4.6E-4		4.9E-4 2.1E-3		1.0E-4 1.3E-3		2.8E-3 6.1E-3

Abstract

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Figures (11)

Tables (3)

Equations (1)

Journal of Optical Communications and Networking