Best Paper Award
gRadio-over-Fiber-Based Seamless Optical and Radio Transmission System by Autonomous Self-Healing Technique for Optical Fiber Failuresh
Masayuki OISHICNaoyasu KAMIYACAbdelmoula BEKKALICKosuke NISHIMURAC
Keiji TANAKA
[Trans. Electron. (JPN Edition), Jul. 2015]

Masayuki OISHI

Naoyasu KAMIYA

Abdelmoula BEKKALI

Kosuke NISHIMURA

Keiji TANAKA
   As optical fiber transmission systems make it possible to convey huge amounts of large-capacity data through broadband applications and services, it is vital to be able to restore these systems when they subject to an optical fiber failure due to a disaster. In the current systems, network operators go directly to the failure points, and therefore, it takes several hours or even much longer to restore a system that has suffered an optical fiber failure. As these failures are likely to occur at specific sections such as paths along bridges, embankments and cliffs, radio back-up links preliminarily installed at these sections can rapidly restore the failed links. Radio-over-Fiber (RoF) is one of the several promising technologies because it has the capability to provide seamless optical and radio transmission. In such a RoF-based seamless optical and radio transmission system, a self-healing function is required for detecting optical fiber failures and autonomously switching to the back-up links. In addition, it is necessary to clarify the degradation of signal quality caused by the switching operation when designing system parameters such as the number of radio back-up links and transmission distance. The system parameters for seamless optical and radio transmission have not previously been investigated in detail.
  This paper proposes a novel autonomous self-healing technique utilizing a self-injection-locked Fabry-Perot laser, and it has been experimentally confirmed that the switching operation can be completed within the required restoration time for network lifelines. The proposed technique can autonomously and rapidly restore multiple optical fiber failures with a high degree of reliability. In addition, the signal quality degradation caused by the switching operation has been quantitatively evaluated by RoF transmission experiments utilizing the proposed technique. The results presented in this paper enable the design of seamless optical and radio transmission systems with multiple radio back-up links.
  As described above, the technique proposed in this paper is a highly effective and useful way of reinforcing disaster resistance, for which there is a high social need in order to safeguard optical fiber communication infrastructure, and thus, this paper is a suitable candidate for the IEICE Best Paper Award.

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