期刊
JOURNAL OF LIGHTWAVE TECHNOLOGY
卷 33, 期 7, 页码 1373-1379出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2015.2397700
关键词
Digital signal processing; optical fiber communication; optical modulation; optical transmitter; photonic band gap fiber
资金
- EPSRC Fellowship [EP/K003038/1]
- EU FP7 project MODE-GAP [258033]
- EPSRC [EP/I061196X]
- Engineering and Physical Sciences Research Council [EP/I01196X/1, EP/K003038/1] Funding Source: researchfish
- EPSRC [EP/I01196X/1, EP/K003038/1] Funding Source: UKRI
The 2-mu m 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.
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