Master-slave carrier recovery for M-QAM multicore fiber transmission.

Lars Lundberg,Ruben S Luís,Georg Rademacher,Magnus Karlsson,Benjamin J Puttnam,Peter A Andrekson,Naoya Wada,Yoshinari Awaji

doi:10.1364/oe.27.022226

Abstract

Master-slave carrier recovery is a digital signal processing technique that uses correlated phase noise in multi-channel receivers to eliminate redundant carrier recovery blocks. In this paper we experimentally investigate the performance of master-slave carrier recovery for multicore fiber transmission in the presence of inter-channel nonlinear interference. Using a triple parallel loop setup we jointly receive three spatial channels in a 7-core fiber for transmission distances of up to 1600 km. We find that an increased launch power causes a moderate penalty on the slave channels. Furthermore, we study the penalty from a non-zero inter-core skew.

Highlights

Spatial-division multiplexing (SDM) has been widely proposed as a step in the development of fiber optical communication systems [1]
This means that performance differences due to different crosstalk levels are not studied, but we note that additional crosstalk on some cores possible in some fiber designs could have an impact on master-slave carrier recovery, similar to self-homodyne detection [16]
We have investigated master-slave carrier recovery in multicore wavelength-division multiplexing (WDM) transmission, via a triple parallel recirculating loop experiment

Summary

Introduction

Spatial-division multiplexing (SDM) has been widely proposed as a step in the development of fiber optical communication systems [1]. To become an attractive step to take, it is not enough to offer only increased capacity, there needs to be cost benefits. One limiting factor of modern systems is the power consumption and size of transceivers [4]. In this regard, SDM offers several advantages, one of which is the potential for transceiver integration and hardware sharing, e.g. by using the same light source to supply carrier and local oscillator (LO) to many spatial channels. Apart from the size benefits, this means that the spatial channels experience largely the same laser phase noise [5,6], which enables power consumption savings by eliminating redundant digital signal processing (DSP) blocks through master-slave carrier recovery [7]

Methods

Results

Conclusion