Efficient and Reliable Protection Mechanism in Long-Reach PON

Shicheng Zhang; Wei Ji; Xiao Li; Kangrui Huang; Zenglu Yan

doi:10.1364/JOCN.8.000023

Journal of Optical Communications and Networking
Vol. 8,
Issue 1,
pp. 23-32
(2016)
•https://doi.org/10.1364/JOCN.8.000023

Efficient and Reliable Protection Mechanism in Long-Reach PON

Shicheng Zhang, Wei Ji, Xiao Li, Kangrui Huang, and Zenglu Yan

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Shicheng Zhang, Wei Ji, Xiao Li, Kangrui Huang, and Zenglu Yan, "Efficient and Reliable Protection Mechanism in Long-Reach PON," J. Opt. Commun. Netw. 8, 23-32 (2016)

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Abstract

Network survivability and protection mechanisms are very important and necessary in optical networks. The long-reach passive optical network (LR-PON) proposed in this paper extends the access network to hundreds of kilometers, and it can support more optical network units by wavelength division multiplexing technology. We propose an efficient protection mechanism for the whole LR-PON. Optical encoders are used to monitor the whole network, and a network management system in the central office will initialize the protection process by monitoring the information it collects. When the network works normally, space division multiplexing technology is adopted to reduce the loss and crosstalk of signals. The designed system propagates the upstream and downstream signals in different fiber rings to mitigate the influence of Rayleigh backscattering. The proposed protection mechanism can protect the network from the multi-faults of fiber links with the designed switches. Furthermore, the loss, availability, costs, and network performance are also studied. The results obtained prove the feasibility of the proposed network. The network is costless and reliable, and it has high availability of up to 99.9992% by the protection mechanism.

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Component	Insertion Loss (dB)
AWG	$L_{AWG}$	3
Splitter	$L_{S}$	3
Optical switch $3 \times 4$ (state 1)	$L_{OS 1}$	0.8
Optical switch $3 \times 4$ (state 2,3)	$L_{OS 1^{'}}$	1.6
Optical switch $2 \times 2$	$L_{OS 2}$	0.5
WS	$L_{WS}$	2
Coupler	$L_{C}$	0.5
PSC	$L_{PSC}$	12
Optical switch $1 \times 2$	$L_{OS 3}$	0.5
Circulator	$L_{Circulator}$	0.5
Single-mode fiber (km)	$L_{α}$	0.2

Component/Device	FIT	MTTR (h)	Unavailability		Cost ($)
OLT	256	2	$U_{OLT}$	$5.12 E - 07$	$C_{OLT}$	500
ONU	256	2	$U_{ONU}$	$5.12 E - 07$	$C_{ONU}$	60
Splitter	20	2	$U_{S}$	$4.00 E - 08$	$C_{S}$	10
PSC	50	2	$U_{PSC}$	$1.00 E - 07$	$C_{PSC}$	30
Optical switch $3 \times 4$	300	2	$U_{OS 1}$	$6.00 E - 07$	$C_{OS 1}$	70
Optical switch $2 \times 2$	200	2	$U_{OS 2}$	$4.00 E - 07$	$C_{OS 2}$	2 25
Optical switch $1 \times 2$	200	2	$U_{OS 3}$	$4.00 E - 07$	$C_{OS 3}$	3 25
Coupler	50	2	$U_{C}$	$4.00 E - 08$	$C_{C}$	10
Circulator	100	2	$U_{Circulator}$	$2.00 E - 07$	$C_{Circulator}$	80
WS	200	2	$U_{W S}$	$4.00 E - 07$	$C_{WS}$	140
OA	200	2	$U_{OA}$	$4.00 E - 07$	$C_{OA}$	180
Fiber (km)	60	4	$U_{F}$	$2.40 E - 07$	$C_{F}$	12

Component	Insertion Loss (dB)
AWG	$L_{AWG}$	3
Splitter	$L_{S}$	3
Optical switch $3 \times 4$ (state 1)	$L_{OS 1}$	0.8
Optical switch $3 \times 4$ (state 2,3)	$L_{OS 1^{'}}$	1.6
Optical switch $2 \times 2$	$L_{OS 2}$	0.5
WS	$L_{WS}$	2
Coupler	$L_{C}$	0.5
PSC	$L_{PSC}$	12
Optical switch $1 \times 2$	$L_{OS 3}$	0.5
Circulator	$L_{Circulator}$	0.5
Single-mode fiber (km)	$L_{α}$	0.2

Component/Device	FIT	MTTR (h)	Unavailability		Cost ($)
OLT	256	2	$U_{OLT}$	$5.12 E - 07$	$C_{OLT}$	500
ONU	256	2	$U_{ONU}$	$5.12 E - 07$	$C_{ONU}$	60
Splitter	20	2	$U_{S}$	$4.00 E - 08$	$C_{S}$	10
PSC	50	2	$U_{PSC}$	$1.00 E - 07$	$C_{PSC}$	30
Optical switch $3 \times 4$	300	2	$U_{OS 1}$	$6.00 E - 07$	$C_{OS 1}$	70
Optical switch $2 \times 2$	200	2	$U_{OS 2}$	$4.00 E - 07$	$C_{OS 2}$	2 25
Optical switch $1 \times 2$	200	2	$U_{OS 3}$	$4.00 E - 07$	$C_{OS 3}$	3 25
Coupler	50	2	$U_{C}$	$4.00 E - 08$	$C_{C}$	10
Circulator	100	2	$U_{Circulator}$	$2.00 E - 07$	$C_{Circulator}$	80
WS	200	2	$U_{W S}$	$4.00 E - 07$	$C_{WS}$	140
OA	200	2	$U_{OA}$	$4.00 E - 07$	$C_{OA}$	180
Fiber (km)	60	4	$U_{F}$	$2.40 E - 07$	$C_{F}$	12

Efficient and Reliable Protection Mechanism in Long-Reach PON

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Equations (36)

Journal of Optical Communications and Networking