Three-dimensional grid architecture supporting discretionary direct communication among optical network units in metro-access networks

Wei Lin; Chaoqin Gan; Yuanyuan Chen; Yaqin Guo; Nianfei Zhan

doi:10.1364/JOCN.11.000613

Journal of Optical Communications and Networking
Vol. 11,
Issue 12,
pp. 613-623
(2019)
•https://doi.org/10.1364/JOCN.11.000613

Three-dimensional grid architecture supporting discretionary direct communication among optical network units in metro-access networks

Wei Lin, Chaoqin Gan, Yuanyuan Chen, Yaqin Guo, and Nianfei Zhan

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Wei Lin, Chaoqin Gan, Yuanyuan Chen, Yaqin Guo, and Nianfei Zhan, "Three-dimensional grid architecture supporting discretionary direct communication among optical network units in metro-access networks," J. Opt. Commun. Netw. 11, 613-623 (2019)

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Abstract

In this paper, a three-dimensional grid architecture supporting discretionary direct communication among optical network units (ONUs) is proposed. By setting up one $N \times N\hspace{3pt}$ arrayed waveguide grating (AWG) and two coarse wavelength division multiplexers in the remote node (RN), the optimal path selection of discretionary direct communication among ONUs can be carried out. At the same time, the construction of the RN is simple. By combining with a three-band wavelength allocation, downstream and upstream signals as well as direct-communication signals can be simultaneously transmitted. By utilizing a four-level protection mechanism, three kinds of optical fiber fault protection (i.e., feeder fiber fault protection, distribution fiber fault protection, and interconnecting fiber fault protection) can be achieved. Besides, both the scalability and the reliability of the network can be greatly improved. Finally, the feasibility of the proposed architecture is demonstrated by the simulation experiment.

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Type of ONU	Working Mode	All Possible States of ${O S}_{2}$ (Connection Mode of ${O S}_{2}$ ’s Port)
Source ONU	Normal work/ protection mode	4→3, 4→2, 4→1, 4→6
Destination ONU	Normal work/ protection mode	6→5, 2→5, 3→5
The others	Normal work/ protection mode	2→6, 3→6

Source ONU	Destination ONU	Proposed Scheme Link Distance	Grid Network Link Distance
${O N U}_{1}^{1}$	${O N U}_{n}^{n}$	$A W G + 2 O N U$	$2 A W G + (n - 1) O N U$
${O N U}_{2}^{1}$	${O N U}_{n}^{n}$	$A W G + O N U$	$2 A W G + (n - 1) O N U$
${O N U}_{3}^{1}$	${O N U}_{n}^{n}$	$A W G + 2 O N U$	$2 A W G + (n - 1) O N U$
…	…	…	…
${O N U}_{n / 2}^{1}$	${O N U}_{n}^{n}$	$A W G + (n / 2 - 1) O N U$	$2 A W G + (n - 1) O N U$
…	…	…	…
${O N U}_{n}^{1}$	${O N U}_{n}^{n}$	$A W G + O N U$	$2 A W G + (n - 1) O N U$
${O N U}_{1}^{n - 1}$	${O N U}_{n - 2}^{2}$	$A W G + 4 O N U$	$2 A W G + n O N U$

Component	Symbol	Insertion Loss (dB)	References
Multiplexer	$L_{M U X}$	3	[10]
Circulator	$L_{C i r}$	0.5	[10]
Optical switch	$L_{O S}$	0.5	[10]
Coupler	$L_{C p l}$	0.5	[11]
CWDM	$L_{C W D M}$	0.5	[12]
AWG	$L_{A W G}$	3	[10]
WB	$L_{W B}$	3	[13]
Splitter (power splitter)	$L_{S p}$	3	[10]
WF	$L_{W F}$	3.5	[14]
Fiber	$α_{F}$	0.2 dB/km	[10]

Component	Symbol	Unreliability (Failure/ $10^{9} h$ )	References
OLT	$U_{O L T}$	$5.12 \times 10^{- 7}$	[10]
EDFA	$U_{E D F A}$	$4 \times 10^{- 7}$	[10]
Splitter	$U_{S p}$	$4 \times 10^{- 8}$	[10]
Circulator	$U_{C i r}$	$2 \times 10^{- 7}$	[10]
Coupler	$U_{C p l}$	$4 \times 10^{- 8}$	[11]
Optical Switch	$U_{O S}$	$4 \times 10^{- 7}$	[10]
WF	$U_{W F}$	$3 \times 10^{- 7}$	[15]
WB	$U_{W B}$	$1.2 \times 10^{- 6}$	[15]
AWG	$U_{A W G}$	$4.8 \times 10^{- 6}$	[10]
CWDM	$U_{C W D M}$	$1.44 \times 10^{- 5}$	[16]
ONU	$U_{O N U}$	$5.12 \times 10^{- 7}$	[10]
Fiber	$U_{F}$	$2.4 \times 10^{- 7} / k m$	[10]

Type of ONU	Working Mode	All Possible States of ${O S}_{2}$ (Connection Mode of ${O S}_{2}$ ’s Port)
Source ONU	Normal work/ protection mode	4→3, 4→2, 4→1, 4→6
Destination ONU	Normal work/ protection mode	6→5, 2→5, 3→5
The others	Normal work/ protection mode	2→6, 3→6

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Journal of Optical Communications and Networking