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High-capacity directly modulated optical transmitter for 2-μm spectral region

: Liu, Z.X.; Chen, Y.; Li, Z.H.; Kelly, B.; Phelan, R.; O'Carroll, J.; Bradley, T.; Wooler, J.P.; Wheeler, N.V.; Heidt, A.M.; Richter, T.; Schubert, C.; Becker, M.; Poletti, F.; Petrovich, M.N.; Alam, Shaif-ul; Richardson, D.J.; Slavik, R.


Journal of Lightwave Technology 33 (2015), Nr.7, S.1373-1379
ISSN: 0733-8724
European Commission EC
FP7-ICT; 258033; MODE-GAP
Fraunhofer HHI ()

The 2-µm wave band is emerging as a potential new window for optical telecommunications with several distinct advantages over the traditional 1.55 mu m region. First of all, the hollow-core photonic band gap fiber (HC-PBGF) is an emerging transmission fiber candidate with ultra-low nonlinearity and lowest latency (0.3% slower than light propagating in vacuum) that has its minimum loss within the 2-mu m wavelength band. Second, the thulium-doped fiber amplifier that operates in this spectral region provides significantly more bandwidth than the erbium-doped fiber amplifier. In this paper, we demonstrate a single-channel 2-mu m transmitter capable of delivering >52 Gbit/s data signals, which is twice the capacity previously demonstrated. To achieve this, we employ discrete multitone modulation via direct current modulation of a Fabry-Perot semiconductor laser. The 4.4-GHz modulation bandwidth of the laser is enhanced by optical injection locking, providing up to 11 GHz modulation bandwidth. Transmission over 500-m and 3.8-km samples of HC-PBGF is demonstrated.