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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 16, Iss. 7 — Mar. 31, 2008
  • pp: 4494–4498
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Reliable tree-type passive optical networks with self-restorable apparatus

Chien Hung Yeh, Fu-Yuan Shih, Gee-Kung Chang, and Sien Chi  »View Author Affiliations


Optics Express, Vol. 16, Issue 7, pp. 4494-4498 (2008)
http://dx.doi.org/10.1364/OE.16.004494


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Abstract

We propose and investigate a simply self-restored tree-type time-division-multiplexed passive optical network (TDM-PON) with duplex fiber system against the fiber failure. The new proposed optical line terminal (OLT), optical network unit (ONU), and remote node (RN) can be used to prevent and protect the occurrence of fiber failure in the self-protected tree-type PON. The protection and restoration time of the access network can be archived within 7 ms in this experiment. In addition, the performances of data traffic for the fiber access network are also analyzed and discussed.

© 2008 Optical Society of America

1. Introduction

In this paper, we propose and experimentally demonstrate self-restored architecture for the cost-effective, tree-based TDM-PON to detect and prevent the occurrence of fiber failure. The proposed structure can protect the transmission path failure in the feeder fiber as well as the failure in distributed fibers. The performance of the downstream and upstream data traffic in this proposed TDM-PON architecture have also been analyzed.

Fig. 1. Proposed self-restored tree-based TDM-PON architecture without fiber failure and each ONUs connect to working fiber. The black and red fibers are working and restoring fiber paths.

2. Protection apparatus

Fig. 2. Proposed self-restored tree-based TDM-PON architecture when a fiber failure occurs on feeder fiber between OLT and RN.

In the ITU-T G.983.1, two OLTs are used in full duplex network to prevent and protect the fiber fault. Compared with the full duplex system specified in the ITU-T G.983.1, the proposed architecture only uses single OLT against fiber fault in order to reduce the cost for fiber protection. However, when the OLT breaks down, the proposed fiber access network will be disconnected. Of course, the proposed protection network could use two OLTs to avoid the OLT breaking down.

Fig. 3. Proposed self-restored tree-based TDM-PON architecture when a fiber failure occurs on distributed fiber between RN and ONUi.
Fig. 4. Protection and restoration time of the proposed self-restored PON is within 7 ms.

3. System testing and analysis

To verify the performance of the proposed self-restored tree-type TDM-PON, an experiment is performed. Figure 1 shows the experimental setup in the self-protected architecture for serving eight OUNs. In our experiment, a transmission distance between OLT and each ONU is set to 20 km long for the working and restoring fiber paths. The 1490 nm downstream and 1310 nm upstream wavelengths have 1.25 Gb/s direct modulations. Besides, the output powers of 1490 and 1310 nm lasers are 2.0 and 1.8 dBm. In regard to the power budget of protection PON system, the traffic signal will traverse a 1×2 CP (~3 dB), a 1×8 SP (~9 dB), an OS (~1 dB) and about 20 km standard single mode fiber (SSMF) (~4 dB), thus the total loss budget is about 17 dB at least, when the data traffic without and with fiber protection. In the proposed system, the protection and restoration time can be measured within 7 ms, as shown in Fig. 4. In real system, the requirement for the protection and restoration time [7

7. A. D. Hossain, H. Erkan, R. Dorsinville, M. Ali, A. Shami, and C. Assi, “Protection for a ring-based EPON architecture,” in International Conference on Broadband Networks, 2005, pp. 626–631.

] was within 2 ms for no loss of traffic and fault detection. The proposed protection architecture will bring package loss due to the additional optical switch. In addition, the bit error rate (BER) performances are measured by a 1.25 Gb/s non-return-to-zero (NRZ) pseudo random binary sequence (PRBS) with a pattern length of 231-1 for the downstream and upstream traffic without and with protections (on the working and restoring paths) no matter the fiber fault occurs on the feeder or distributed fibers (as seen in Figs. 2 and 3), respectively. Therefore, Figure 5 shows the BER performance of (a) downstream and (b) upstream traffic at 1.25 Gb/s modulation through the working and restoring fiber paths without and with protection, respectively. The observed optical power penalties of Figs. 5(a) and 5(b) are very smaller when the BER is 10-9.

Fig. 5. BER performances of (a) downstream and (b) upstream traffic at 1.25 Gb/s modulation through the working and restoring fiber paths between OLT and ONUi without and with protection no matter the fiber fault occurs on the feeder or distributed fibers, respectively.

4. Conclusion

In summary, we have proposed and investigated a self-restored, tree-type TDM-PON with duplex fiber system against the fiber failure. The new proposed architecture with enhanced optical line termination, optical network unit, and remote node are designed and implemented to detect and restore fiber failure in the self-protected PON. The protection and restoration time of this proposed method can be achieved within 7 ms of the occurrence of a failure. As a result, the proposed TDM-PON access network protection is designed with a simple and elegant scheme while achieving ease of operation, and cost-effective. The performance analysis of up-steam and down-stream data traffic for the access network have also discussed and reported.

Acknowledgment

Authors would like to thank C. S. Lee and F. C. Chao for their help of the experimental set up and data collection.

1.

F.-T. An, D. Gutierrez, K. S. Kim, J. W. Lee, and L. G. Kazovsky, “SUCCESS-HPON: A next-generation optical access architecture for smooth migration from TDM-PON to WDMPON,” IEEE Commun. Mag. 43, S40–S47 (2005). [CrossRef]

2.

G. Kramer and G. Pesavento, “Ethernet passive optical network (EPON): building a next-generation optical access network,” IEEE Commun. Mag. 40, 66–73 (2002). [CrossRef]

3.

IEEE Standard for Information Technology, IEEE Std 802.3ah-2004 (IEEE, 2004), pp.01–623.

4.

ITU-T Recommendation G.984.2-2003, “Gigabit-capable passive optical networks (GPON): physical media dependent (PMD) layer specification,” (ITU, 2003).

5.

M. Abrams, P. C. Becker, Y. Fujimoto, V. O’Byrne, and D. Piehler, “FTTP deployments in the United States and Japan-equipment choices and service provider imperatives,” J. Lightwave Technol. 23, 236–246 (2005). [CrossRef]

6.

K. D. Langer, J. Grubor, and K. Habel, “Promising evolution paths for passive optical access networks,” in ICTON’04, 2004, pp. 202–207.

7.

A. D. Hossain, H. Erkan, R. Dorsinville, M. Ali, A. Shami, and C. Assi, “Protection for a ring-based EPON architecture,” in International Conference on Broadband Networks, 2005, pp. 626–631.

8.

X. Sun, Z. Wang, C.-K. Chan, and L.-K. Chen, “A novel star-ring protection architecture scheme for WDM passive optical access networks,” in Optical Fiber Communication Conf. 2005, Tech. Dig., 2005, pp. JWA53.

9.

W.-P. Lin, M.-S. Kao, and S. Chi, “The modified star-ring architecture for high-capacity subcarrier multiplexed passive optical networks,” J. Lightwave Technol. 19, 32–39 (2001). [CrossRef]

OCIS Codes
(060.4257) Fiber optics and optical communications : Networks, network survivability
(060.4261) Fiber optics and optical communications : Networks, protection and restoration

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: October 25, 2007
Revised Manuscript: December 3, 2007
Manuscript Accepted: December 13, 2007
Published: March 18, 2008

Citation
Chien Hung Yeh, Fu-Yuan Shih, Gee-Kung Chang, and Sien Chi, "Reliable tree-type passive optical networks with self-restorable apparatus," Opt. Express 16, 4494-4498 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-7-4494


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References

  1. F.-T. An, D. Gutierrez, K. S. Kim, J. W. Lee, L. G. Kazovsky, “SUCCESS-HPON: A next-generation optical access architecture for smooth migration from TDM-PON to WDMPON,” IEEE Commun. Mag. 43, S40–S47 (2005). [CrossRef]
  2. G. Kramer, G. Pesavento, “Ethernet passive optical network (EPON): building a next-generation optical access network,” IEEE Commun. Mag. 40, 66–73 (2002). [CrossRef]
  3. IEEE Standard for Information Technology, IEEE Std 802.3ah-2004 (IEEE, 2004), pp.01–623.
  4. ITU-T Recommendation G.984.2-2003, “Gigabit-capable passive optical networks (GPON): physical media dependent (PMD) layer specification,” (ITU, 2003).
  5. M. Abrams, P. C. Becker, Y. Fujimoto, V. O’Byrne, D. Piehler, “FTTP deployments in the United States and Japan-equipment choices and service provider imperatives,” J. Lightwave Technol. 23, 236–246 (2005). [CrossRef]
  6. K. D. Langer, J. Grubor, K. Habel, “Promising evolution paths for passive optical access networks,” in ICTON’04, 2004, pp. 202–207.
  7. A. D. Hossain, H. Erkan, R. Dorsinville, M. Ali, A. Shami, C. Assi, “Protection for a ring-based EPON architecture,” in International Conference on Broadband Networks, 2005, pp. 626–631.
  8. X. Sun, Z. Wang, C.-K. Chan, L.-K. Chen, “A novel star-ring protection architecture scheme for WDM passive optical access networks,” in Optical Fiber Communication Conf. 2005, Tech. Dig., 2005, pp. JWA53.
  9. W.-P. Lin, M.-S. Kao, S. Chi, “The modified star-ring architecture for high-capacity subcarrier multiplexed passive optical networks,” J. Lightwave Technol. 19, 32–39 (2001). [CrossRef]

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