Novel synchronous DPSK optical regenerator based on a feed-forward based carrier extraction scheme

Selwan K Ibrahim,Danish Rafique,Andrew D Ellis,John A O’Dowd,Stylianos Sygletos,Ruwan Weerasuriya

doi:10.1364/oe.19.009445

Abstract

We experimentally demonstrate a novel synchronous 10.66 Gbit/s DPSK OEO regenerator which uses a feed-forward carrier extraction scheme with an injection-locked laser to synchronize the regenerated signal wavelength to the incoming signal wavelength. After injection-locking, a low-cost DFB laser used at the regenerator exhibited the same linewidth characteristics as the narrow line-width transmitter laser. The phase regeneration properties of the regenerator were evaluated by emulating random Gaussian phase noise applied to the DPSK signal before the regenerator using a phase modulator driven by an arbitrary waveform generator. The overall performance was evaluated in terms of electrical eye-diagrams, BER measurements, and constellation diagrams.

Highlights

The increasing demand for high capacity transmission networks is linked to the vast spread of bandwidth hungry internet applications [1]
In this paper we experimentally demonstrate for the first time the phase regeneration property of a novel synchronous 10.66Gbit/s DPSK OEO regenerator by emulating Gaussian phase noise using an arbitrary waveform generator (AWG) and a 40Gbit/s phase modulator covering the whole bandwidth (BW) of the DPSK signal
We experimentally demonstrated for the first time a novel Synchronous DPSK OEO regenerator for 10.66Gbit/s DPSK signals

Summary

Introduction

The increasing demand for high capacity transmission networks is linked to the vast spread of bandwidth hungry internet applications [1]. A low-cost distributed-feedback (DFB) laser was injection-locked to the extracted carrier which was extracted by stripping off the modulation from a 10.66Gbit/s DPSK signal in a feed-forward manner based on a recently published carrier extraction scheme [9]. This regenerator synchronizes the wavelength of the regenerated data signal to the wavelength of the incoming signal. The proposed scheme can be developed further to provide important functionalities which are important for different applications such as carrier distributed networks and multi-carrier add-drop multiplexers

Experimental setup

Results

Conclusions