Summary
International Conference on Emerging Technologies for Communications
2020
Session Number:C2
Session:
Number:C2-1
Coexisting transmission of SCM and 10GBB signals using new coding method that reduces power in low frequency band for CATV system
Tomoya Kusunoki, Takuya Kurakake,
pp.-
Publication Date:2020/12/2
Online ISSN:2188-5079
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Summary:
Cable television (CATV) is currently using a sub-carrier multiplexing (SCM) transmission method, whose transmission capacity is about 4 Gbps, for HDTV (2K) broadcast services. We have been studied a 10-Gbps baseband (10GBB) transmission method utilizing the same transmission coding as 10Gbps-Ethernet Passive Optical Network (10G-EPON), as it is necessary to further expand the transmission capacity for services such as 4K/8K broadcasting. To introduce the 10GBB method in the CATV system, a migration period is required because there are already many CATV subscribers using the SCM method. It should be possible for the SCM and 10GBB methods to coexist by means of wavelength division multiplexing (WDM), but this requires an additional wavelength separation filter in the SCM optical receivers. Therefore, we propose a new coding method, 3B4B conversion on the 10GBB signal, that reduces power in the low frequency band of the 10GBB signal that overlaps with the SCM signal (90?770 MHz), even when the feedforward error correction (FEC) of the 10G-EPON is adopted. By using the proposed method, SCM and 10GBB signals can coexist without an additional optical filter depending on the condition of the power ratio of the signals. We calculated the power ratio condition by simulation and confirmed that there is a range of power ratio in which both methods can coexist.