期刊
OPTICS EXPRESS
卷 23, 期 2, 页码 724-738出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.23.000724
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资金
- EU project Big Pipes
- Center for Functional Nanostructures (CFN) of the Deutsche Forschungsgemeinschaft (DFG) [A 4.8]
- ERC Starting Grant EnTeraPIC [280145]
- Karlsruhe School of Optics & Photonics (KSOP)
- Helmholtz International Research School for Teratronics (HIRST)
- Alfried Krupp von Bohlen und Halbach Foundation
- Initiative and Networking Fund of the Helmholtz Association
- Higher Education Authority (HEA)
Terabit/s super-channels are likely to become the standard for next-generation optical networks and optical interconnects. A particularly promising approach exploits optical frequency combs for super-channel generation. We show that injection locking of a gain-switched laser diode can be used to generate frequency combs that are particularly well suited for terabit/s super-channel transmission. This approach stands out due to its extraordinary stability and flexibility in tuning both center wavelength and line spacing. We perform a series of transmission experiments using different comb line spacings and modulation formats. Using 9 comb lines and 16QAM signaling, an aggregate line rate (net data rate) of 1.296 Tbit/s (1.109 Tbit/s) is achieved for transmission over 150 km of standard single mode fiber (SSMF) using a spectral bandwidth of 166.5 GHz, which corresponds to a (net) spectral efficiency of 7.8 bit/s/Hz (6.7 bit/s/Hz). The line rate (net data rate) can be boosted to 2.112 Tbit/s (1.867 Tbit/s) for transmission over 300 km of SSMF by using a bandwidth of 300 GHz and QPSK modulation on the weaker carriers. For the reported net data rates and spectral efficiencies, we assume a variable overhead of either 7% or 20% for forward-error correction depending on the individual sub-channel quality after fiber transmission. (C) 2015 Optical Society of America
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