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Fiber-to-the-home (FTTH) has recently come into fullscale use. Over 40% of cable television (CATV) operators have already shifted to FTTH1). A passive optical network (PON) system, a form of FTTH, has been popular in communication access networks. Now, a 10Gbps-class PON system2)3) is expected to be put into practical use. The sub-carrier multiplexing (SCM)4) and frequency modulation (FM) conversion5)6) methods have already been standardized as applicable to transmitting broadcast signals over FTTH. They use the 1550-nm wavelength in optical fiber exclusively for broadcasting7) and are applied to both analog (VSB-AM) and digital (OFDM, QAM) signals. In addition, conventional set top boxes (STBs) can be applied to these methods. Such compatibility has affected the growth and development of these methods. These two methods are referred to as the frequency division multiplexing (FDM) methods. Ultra high definition television (UHDTV), which has 4 or 16 times the number of pixels of HDTV, was proposed and approved as a standard by the ITU8). In terms of the distribution of UHDTV programs to homes, we can expect an increase in the demand for a higher transmission bandwidth with lower cost. Considering the adaptation to such a new broadcast system, progress on replacing metal cables with optical fibers even in homes9), and the expiration of analog transmission by March 201510) in Japan, it is now possible to apply time-division multiplexing of baseband digital broadcasting signals for distribution to homes. We previously proposed such a time-division multiplexing (TDM) method (hereafter, "the TDM method") 11)12). The TDM method transmits baseband digital broadcasting signals with a modified transport stream multiplexing frame (TSMF)13) as a dedicated frame structure. It has a higher multiplexing efficiency compared with conventional TDM methods in order to distribute broadcast signals over an optical network, a TV trunk network that connects broadcasting stations based on asynchronous transfer mode (ATM) technology14), and Internet Protocol television (IPTV)15)-17), which has been recently developed. Furthermore, compared with conventional FDM methods, the requirements of transmission system components are substantially mitigated because the Abstract We previously proposed a time division multiplexing method for digital broadcasts over fiber-tothe-home. We evaluated the number of optical amplifiers, subscribers, and service areas with a simple star-type optical network model. Compared with the frequency division multiplexing methods used in conventional cable television systems, the number of optical amplifiers of our previously proposed method achieved less than 16 37% that of conventional methods or accommodated an increase in subscribers 2.9 6.1 times more than conventional methods even with an optical laser of inferior relative intensity noise (RIN). By analyzing a dominant factor for configuring a cost-effective distribution network, we found that it was valid to mitigate the requirement for optical power at a receiver and set a strict requirement for the RIN of an optical laser.

[Paper] Evaluation of Optical Network of Multichannel Baseband Digital Broadcasts Over FTTH