Long-reach 10-Gb/s RSOA-based WDM PON employing QPSK signal and coherent receiver

K Y Cho,T Sano,Y Horiuchi,U H Hong,M Suzuki,A Agata,Y C Chung,S P Jung,Y Takushima

doi:10.1364/oe.20.015353

Abstract

We demonstrate a long-reach wavelength-division-multiplexed passive optical network (WDM PON) operating at the symmetric rate of 10.3 Gb/s. For the cost-effectiveness, we realize the upstream transmission by utilizing directly-modulated TO-can packaged reflective semiconductor optical amplifiers (RSOAs) and digital coherent receivers. In addition, to overcome the limited modulation bandwidth of this TO-can packaged RSOA (~2.2 GHz) and operate it at 10.3 Gb/s, we utilize the quadrature phase shift keying (QPSK) format and the electronic phase equalization technique. The result shows that we can extend the maximum reach of the 10.3-Gb/s RSOA-based WDM PON to ~80 km without using any remote amplifiers.

Highlights

To further enhance the competitiveness of the wavelength-division-multiplexed passive optical network (WDM PON), we should be able to increase its operating speed and maximum reach cost-effectively [1]
We demonstrate a long-reach wavelength-division-multiplexed passive optical network (WDM PON) operating at the symmetric rate of 10.3 Gb/s
For the cost-effectiveness, we realize the upstream transmission by utilizing directly-modulated TO-can packaged reflective semiconductor optical amplifiers (RSOAs) and digital coherent receivers

Summary

Introduction

To further enhance the competitiveness of the wavelength-division-multiplexed passive optical network (WDM PON), we should be able to increase its operating speed and maximum reach cost-effectively [1]. It becomes inevitable to utilize separate fibers for the upstream and downstream signals [7] To solve this problem and extend the coverage of the central office (CO), we have recently developed a cost-effective coherent detection technique applicable to the access network [9]. By using this technique, we could demonstrate the RSOA-based WDM PON operating at the speed of 2.5 Gb/s with the maximum reach of >100 km without using any remote EDFA [5]. We focus our efforts for the cost-effective implementation of the upstream transmission by using the directly-modulated TO-can packaged RSOAs and the digital coherent receivers recently developed for the use in the access network [9]. The results show that, due to the excellent sensitivity of the digital coherent receiver, the maximum reach of this network can be increased to ~80 km without using any remote EDFA

Experiment and results

Summary