Liu, Zhixin, Chen, Yong, Li, Zhihong, Kelly, Brian, Phelan, Richard, O'Carroll, John, Bradley, Tom, Wooler, John, Wheeler, Natalie V., Heidt, Alexander, Richter, Thomas, Schubert, Colja, Becker, Martin, Poletti, Francesco, Petrovich, Marco N., Alam, Shaif-ul, Richardson, David J. and Slavík, Radan (2015) High-capacity directly modulated optical transmitter for 2µm spectral region. Journal of Lightwave Technology, 33 (7), 1373-1379. (doi:10.1109/JLT.2015.2397700).
Abstract
The 2µm wave band is emerging as a potential new window for optical telecommunications with several distinct advantages over the traditional 1.55µm 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 2µm wavelength band. Secondly, 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 2µm transmitter capable of delivering >52 Gbit/s data signals, which is twice the capacity previously-demonstrated. To achieve this we employ discrete multi-tone (DMT) modulation via direct current modulation of a Fabry-Perot semiconductor laser. The 4.4GHz modulation bandwidth of the laser is enhanced by optical injection locking, providing up to 11GHz modulation bandwidth. Transmission over 500m and 3.8km samples of HCPBGF is demonstrated.
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