Fiber- and FSO-Protected Connections for Long-Reach TWDM Access Architecture With Fault Protection

Chien-Hung Yeh,Bo-Yin Wang,Wei-Yao You,Wei-Hung Hsu,Chi-Wai Chow,Jhao-Ren Chen,Shien-Kuei Liaw

doi:10.1109/access.2020.3031609

Abstract

In this paper, we propose a long-reach star-ring-based timeand wavelength-divisionmultiplexing passive optical network (TWDM-PON) by using fiberand free space optical (FSO)-protected architecture against fiber breakpoint. Here, the new fiber-based and FSO-based optical network unit (ONU) modules are designed in the PON system to achieve the self-protected operation. Thus, the adjacent ONU is linked to produce the fiberor FSO-based reconnections. Thus, 4 × 10 Gbit/s downstream and 10 Gbit/s upstream signals can be reached through 70 km fiber transmission and a length of free space link without signal amplification and dispersion compensation. Moreover, the relationships of splitter ratio and FSO link length in the proposed TWDM access network are also analyzed and discussed.

Highlights

The requirement of broad bandwidth has been grown speedily due to the huge number of internet user, cloud information, big data process, 4K/8K video, social networking, data center, and video gaming and conference [1]–[3]
The four time- and wavelength-division-multiplexing (TWDM) DS signals will be split by a 1×N optical splitter (OSP) at the remote node (RN) for broadcasting
The new fiber-based and free space optical (FSO)-based optical network unit (ONU) modules were proposed in the passive optical network (PON) system to achieve the self-protected operation

Summary

Introduction

The requirement of broad bandwidth has been grown speedily due to the huge number of internet user, cloud information, big data process, 4K/8K video, social networking, data center, and video gaming and conference [1]–[3]. In the fiber-based protection network, the maximum splitter ratios of 32 and 16 are reached after 50 and 70 km SMF transmission, respectively, according to the available power budget without using optical amplification and dispersion compensation.

Results

Conclusion