Fenghai Liu, Jon Bennike, Supriyo Dey, Christian Rasmussen,
Benny Mikkelsen, Pavel Mamyshev

Denis Gapontsev, Vladlen Ivshin
IPG Photonics Corporation, USA

Introduction
Lower cost per transmitted bit and emerging 40 Gbit/s router interfaces are the main drivers for 40 Gbit/s transport. Today, cost effective 40Gbit/s terminal equipment is becoming available whereas ultra-long haul 40 Gbit/s transport is still very challenging. However, new techniques such as carrier-suppressed RZ (CS-RZ) modulation format, distributed Raman amplification and new fiber types continue to increase the achievable transmission distance for 40 Gbit/s [1-6]. For systems with terrestrial span length, actual demonstration of error free transmission has been made for up to 2000 km (20 ´ 100 km) in an experiment using ETDM transmitter [1]. It should, however, be noted that most long distance 40 Gbit/s transmission demonstrations are performed with either optical time demultiplex-ing receivers or without actually demonstrating error-free performance (i.e., FEC assumed but not implemented).

In this paper we demonstrate error-free transmission of 40 channels at 40 Gbit/s over a record distance of 3600 km UltraWaveT fiber with a terrestrial span length of 100 km. The dispersion managed fiber spans are symmetrical so that the fiber can be used equally well for transmission in both directions which is very important for terrestrial systems. The fiber loss is compensated by distributed Raman amplification only. Importantly, the record distance is obtained with ETDM transmitter and ETDM receiver and without using polarization interleaving.

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