Low-Cost CDC ROADM Architecture Based on Stacked Wavelength Selective Switches

Haining Yang; Brian Robertson; Peter Wilkinson; Daping Chu

doi:10.1364/JOCN.9.000375

Journal of Optical Communications and Networking
Vol. 9,
Issue 5,
pp. 375-384
(2017)
•https://doi.org/10.1364/JOCN.9.000375

Low-Cost CDC ROADM Architecture Based on Stacked Wavelength Selective Switches

Haining Yang, Brian Robertson, Peter Wilkinson, and Daping Chu

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Haining Yang, Brian Robertson, Peter Wilkinson, and Daping Chu, "Low-Cost CDC ROADM Architecture Based on Stacked Wavelength Selective Switches," J. Opt. Commun. Netw. 9, 375-384 (2017)

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Abstract

A highly flexible, stacked, switch module is proposed, wherein multiple independent $1 \times N$ wavelength selective switches (WSSs) can be realized on a single 4k liquid crystal on silicon device. The stacked WSS module can be configured in different ways for application at either the transit side or the add/drop side of a colorless, directionless, and contentionless (CDC) reconfigurable optical add/drop multiplexer (ROADM). Two ROADM architectures are proposed based on the stacked WSS modules. Their costs are analyzed for both a 4-deg network node and a larger 8-deg node. The first proposed ROADM architecture with full CDC features is shown to realize a cost reduction of at least 35% in these two test network nodes, when compared with the conventional CDC ROADM architecture based on the standalone WSSs and multicasting switches (MCSs). The second ROADM architecture proposed has a small probability of wavelength contention, which could be prevented by a local wavelength assignment algorithm. According to our cost estimation, we are able to aggressively reduce the number of components at the add/drop side and make an overall cost reduction of $> 70 %$ and $> 80 %$ in the 4- and 8-deg network nodes, respectively.

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	Standalone	Stacked (std.)	Stacked (cons.)
Assembly and packaging cost	0.40	0.40	0.50
LCOS device	0.20	0.20	0.20
Diffraction grating	0.20	0.60	0.70
Relay lens	0.15	0.20	0.30
Fiber array cluster	0.05	0.10	0.15
Total	1.00	1.50	1.85

			Unit Cost	Quantity	Component Cost	Transit Cost	Add/Drop Cost	Total Cost
Benchmark	Transit	$1 \times 20$ WSSs	1.00	32	32.00	32.00	28.80	60.80
	Add/drop	$4 \times 6$ MSCs	0.50	32	16.00
	Add/drop	Amplifiers	0.10	128	12.80
Architecture I	Transit	8 $1 \times 32$ stacked WSS module	1.50 [1.85]^a	4	6.00 [7.40]	6.00 [7.40]	25.44 [28.24]	31.44 [35.64]
	Add/drop	8 $1 \times 32$ stacked WSS module	1.50 [1.85]	8	12.00 [14.80]
		$1 \times 4$ space switch	0.02	512	10.24
		Amplifiers (low amplification)	0.05	64	3.20
Architecture II	Transit	8 $1 \times 32$ stacked WSS module	1.50 [1.85]	4	6.00 [7.40]	6.00 [7.40]	9.52 [10.92]	15.52 [18.32]
	Add/drop	48 $1 \times 12$ stacked WSS module	1.50 [1.85]	4	6.00 [7.40]
		$1 \times 16$ splitters/couplers	0.01	32	0.32
		Amplifiers	0.10	32	3.20

			Unit Cost	Quantity	Component Cost	Transit Cost	Add/Drop Cost	Total Cost
Benchmark	Transit	$1 \times 20$ WSSs	1.00	128	128.00	128.00	230.40	358.40
	Add/drop	$8 \times 16$ MSCs	1.00	128	128.00
	Add/drop	Amplifiers	0.10	1024	102.40
Architecture I	Transit	8 $1 \times 32$ stacked WSS module	1.50 [1.85]^a	16	24.00 [29.60]	24.00 [29.60]	183.04 [205.44]	207.04 [235.04]
	Add/drop	8 $1 \times 32$ stacked WSS module	1.50 [1.85]	64	96.00 [118.40]
		$1 \times 8$ space switch	0.03	2048	61.44
		Amplifiers (low amplification)	0.05	512	25.60
Architecture II	Transit	8 $1 \times 32$ stacked WSS module	1.50 [1.85]	16	24.00 [29.60]	24.00 [29.60]	26.08 [28.88]	50.08 [58.48]
	Add/drop	48 $1 \times 12$ stacked WSS module	1.50 [1.85]	8	12.00 [14.80]
		$1 \times 16$ splitters/couplers	0.01	128	1.28
		Amplifiers	0.10	128	12.8

	Standalone	Stacked (std.)	Stacked (cons.)
Assembly and packaging cost	0.40	0.40	0.50
LCOS device	0.20	0.20	0.20
Diffraction grating	0.20	0.60	0.70
Relay lens	0.15	0.20	0.30
Fiber array cluster	0.05	0.10	0.15
Total	1.00	1.50	1.85

			Unit Cost	Quantity	Component Cost	Transit Cost	Add/Drop Cost	Total Cost
Benchmark	Transit	$1 \times 20$ WSSs	1.00	32	32.00	32.00	28.80	60.80
	Add/drop	$4 \times 6$ MSCs	0.50	32	16.00
	Add/drop	Amplifiers	0.10	128	12.80
Architecture I	Transit	8 $1 \times 32$ stacked WSS module	1.50 [1.85]^a	4	6.00 [7.40]	6.00 [7.40]	25.44 [28.24]	31.44 [35.64]
	Add/drop	8 $1 \times 32$ stacked WSS module	1.50 [1.85]	8	12.00 [14.80]
		$1 \times 4$ space switch	0.02	512	10.24
		Amplifiers (low amplification)	0.05	64	3.20
Architecture II	Transit	8 $1 \times 32$ stacked WSS module	1.50 [1.85]	4	6.00 [7.40]	6.00 [7.40]	9.52 [10.92]	15.52 [18.32]
	Add/drop	48 $1 \times 12$ stacked WSS module	1.50 [1.85]	4	6.00 [7.40]
		$1 \times 16$ splitters/couplers	0.01	32	0.32
		Amplifiers	0.10	32	3.20

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Journal of Optical Communications and Networking