Abstract
Nowadays the Internet not only has fast growing data traffic, but also has a fast growing number of on-line devices. This leads to high demand of capacity and flexibility of the future networks. The conventional Orthogonal Frequency Division Multiplexing (OFDM) and Nyquist pulse shaping signals have the advantage of high spectral efficiency when consisting of superchannels in the Wavelength-Division-Multiplexing (WDM) way. However, they face a cost issue when the spectral granularity of the superchannel is decreased to support more users. This paper proposes for the first time the scheme of Orthogonal-band-multiplexed offset-Quadrature Amplitude Modulation (OBM-OQAM) superchannel. OBM-OQAM superchannel provides large capacity and high spectral efficiency. Furthermore, it has the advantage of offering subbands of variable symbol rate without changing the system configuration. We provide a proof-of-principle demonstration of OBM-OQAM superchannel transmission. In our experiment, 400 Gbps 16 Quadrature Amplitude Modulation (QAM) OBM-OQAM superchannel transmission over 400 km Standard Single Mode Fiber (SSMF) is conducted. The experimental results show that the OBM-OQAM signal has low penalty in multi-band aggregation.
Highlights
The inter-subcarrier-interference caused by the phase noise between the adjacent carriers
Compared with Nyquist-WDM, OFDM-WDM and OBM-OFDM techniques, the OBM-OQAM superchannel does not need guard bands between subbands because they overlap without resulting in crosstalk even if they come from different carriers
According to the theoretical model explained in the paper, we provide two alternative receiving schemes: detecting the full-band superchannel by using the OFDM/
Summary
The inter-subcarrier-interference caused by the phase noise between the adjacent carriers. 11, an optical comb generator is used to offer all 75 subcarriers which come from only one laser source, but each subcarrier still requires one independent modulator. Multicarrier offset quadrature amplitude modulation (MC-OQAM) signal (Fig. 1(d)) has high spectral efficiency. Refs 15 and 16 accomplish generating and detecting electrically orthogonal MC-OQAM signal, where several high spectral efficiency electrical subbands are generated by one signal source, and are modulated to one optical carrier. Each group is modulated by an electrical MC-OQAM signal, offering equidistant subbands of variable symbol rate and high spectral efficiency. With the help of the optical frequency comb generator (OFCG), a proof-of-concept experiment is demonstrated, in which a 400 Gb/s 16QAM OBM-OQAM superchannel is transmitted over 400 km SSMF
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