Abstract
In this paper, we propose a novel approach to simultaneously receive multi-band 100-Gb/s direct-detection optical signal with only one polarization and one conventional 40-GHz photodiode. The modulation format of orthogonal frequency-division multiplexing based on offset quadrature amplitude modulation (OFDM/OQAM) is selected to provide signal spectrum with high side-lobe suppression ratio, which can effectively reduce the electrical sub-band frequency interference. The whole 100-Gb/s OFDM/OQAM signal is comprised of 6 sub-bands with 16- and 32-QAM formats loading. Only one guard band is required to accommodate the overlapped 6-band signal-to-signal beat interference (SSBI). The receiver bandwidth is mainly limited by the digital storage oscilloscope (DSO) of 33 GHz. The transmission distance over standard single mode fiber (SSMF) is up to 320 km.
Highlights
Coherent detection has achieved great success to provide excellent solution for the high-speed and long-haul transmission in the past few years [1,2,3,4]
The whole 100-Gb/s OFDM/offset quadrature amplitude modulation (OQAM) signal is comprised of 6 sub-bands, in which 4 bands are loaded with 32-QAM, and the other 2 bands at higher frequency are loaded with 16-QAM due to the roll off of the frequency response. 6 lasers are used as the pilot carriers to beat the signal
10 training symbols (TSs) are periodically inserted in the front of each OFDM/OQAM frame, which is followed by 500 payload symbols
Summary
Coherent detection has achieved great success to provide excellent solution for the high-speed and long-haul transmission in the past few years [1,2,3,4]. As the lab research and industrial production of coherent 100G/200G have been well carried out, on one hand, the optical research is pursuing higher speed per transponder, which highly relies on the development of electronics devices/components, such as ultra-high-speed ADCs [5]. Yan et al have demonstrated a 100 Gb/s optical intensity modulation/direct detection (IM/DD) transmission with 10G-class devices using 65 GS/s Fujitsu high-speed ADC [6]. The transmission distance using conventional IM/DD scheme is highly limited by the fiber chromatic dispersion. Another alternative DD schemes studies the pilot-assisted single sideband [7]. Chen et al have proposed a cost-effective 40-Gb/s directdetection optical orthogonal frequency division multiplexing (DDO-OFDM) transmission system using block-wise phase switching with single polarization and single PD over 80-km standard single mode fiber (SSMF) [8]
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