Reliable λ-Tuning OLT-Protection Method Based on Backup-Wavelength Pre-assignment and Discovery Process for Resilient WDM/TDM-PONs

This paper proposes a novel wavelength-tuning (λ-tuning) optical line terminal (OLT) protection method for wavelength division multiplexing/time division multiplexing-passive optical networks (WDM/TDM-PONs). Since λ-tuning OLT protection achieves redundancy of OLT ports utilizing only the λ-tunability of optical network units (ONUs) that ONUs intrinsically have for colorless operation, no additional equipment such as redundant OLT ports or optical switches is necessary for the protection. The proposed method is based on backup wavelength pre-assignment and a discovery process. Since the backup wavelengths are pre-assigned, the proposed method shortens the service outage time and balances traffic loads among the active OLT ports after OLT protection. Therefore, the proposed method achieves high-level reliability cost-effectively. Through system demonstrations using media access control boards and λ-selective burst-mode transceivers for symmetric 40-Gb/s WDM/TDM-PONs, the validity of the proposal is examined based on the link-up time and throughput measurement for λ-tuning OLT-protection.

[1]  J. Kani.  Power saving techniques for optical access , 2012, OFC/NFOEC.

[2]  Toshihito Fujiwara,et al.  Long-reach and high-splitting-ratio 10G-EPON system with N:1 OSU protection , 2014, 2014 The European Conference on Optical Communication (ECOC).

[3]  Tomoaki Yoshida,et al.  First λ-tunable dynamic load-balancing operation enhanced by 3-msec bidirectional hitless tuning on symmetric 40-Gbit/s WDM/TDM-PON , 2014, OFC 2014.

[4]  Frank J. Effenberger.  PON resilience , 2014, OFC 2014.

[5]  Vincent O'Byrne.  PON evolution for residential and business applications , 2014, OFC 2014.

[6]  S. Kimura,et al.  100-ns λ-selective burst-mode transceiver for 40-km reach symmetric 40-Gbit/s WDM/TDM-PON , 2013 .

[7]  Tomoaki Yoshida,et al.  An automatic load-balancing DWBA algorithm considering long-time tuning devices for λ-tunable WDM/TDM-PON , 2013 .

[8]  Jun-ichi Kani,et al.  Enabling Technologies for Future Scalable and Flexible WDM-PON and WDM/TDM-PON Systems , 2010, IEEE Journal of Selected Topics in Quantum Electronics.

[9]  Ning Cheng.  Flexible TWDM PONs , 2014, OFC 2014.

[10]  S. Kimura.  WDM/TDM-PON technologies for future flexible optical access networks , 2010, OECC 2010 Technical Digest.

[11]  T. Sakamoto.  Protection schemes beyond currently defined in FTTx , 2013, 2013 Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC).

[12]  Tomoaki Yoshida,et al.  Dynamic-load-balancing algorithm suppressing the number of wavelength reallocations for λ-tunable WDM/TDM-PON , 2014, 2014 The European Conference on Optical Communication (ECOC).

[13]  N A Tomoaki Yoshida.  Recent Research Progress in λ-Tunable WDM/TDM-PON , 2014 .

[14]  Kazutaka Hara,et al.  Flexible and scalable PON protection architecture using N:M redundancy toward next generation access network , 2011, The 17th Asia Pacific Conference on Communications.

[15]  Tomoaki Yoshida,et al.  First demonstration of a wavelength swept discovery process for λ-tunable WDM/TDM-PON system , 2014, OFC 2014.

[16]  Tomoaki Yoshida,et al.  First system demonstration of hitless λ-tuning sequence for dynamic wavelength allocation in WDM/TDM-PON , 2014, OFC 2014.