Journal
OPTICS LETTERS
Volume 41, Issue 8, Pages 1805-1808Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.41.001805
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Funding
- 863 High Technology Plan [2015AA015502]
- National Natural Science Foundation of China (NSFC) [61275069, 61331010, 61322507]
- State Key Laboratory of Optical Communication Technologies and Networks, Wuhan Research Institute of Posts & Telecommunications Open Fund [2016OCTN-01]
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We experimentally demonstrate C-band 2 x 56 Gb/s pulse-amplitude modulation (PAM)-4 signal transmission over 100 km standard single-mode fiber (SSMF) using 18 GHz direct-modulated lasers (DMLs) and direct detection, without inline optical amplifier. A delay interferometer (DI) at the transmitter side is used to extend the transmission reach from 40 to 100 km. A digital Volterra filter at the receiver side is used to mitigate the nonlinear distortions. We obtain an average bit error ratio (BER) of 1.5 x 10(-3) for 2 x 56 Gb/s PAM-4 signal after 100 km SSMF transmission at the optimal input power, which is below the 7% forward error correction (FEC) threshold (3.8 x 10(-3)). (C) 2016 Optical Society of America
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