International Telecommunication Union (ITU) has recently standardized ultrahigh definition television (UHD-TV) with a resolution 16 times more than the current high definition TV. An increase in the efficiency of video source coding or in the capacity of transmission channels will be needed to deliver such programs by passive optical network (PON). In this paper, a high capacity integrated PON infrastructure is proposed to overlay ultrahigh definition television by a complete passive coexistence of 10G-PON (XG-PON) and single carrier directly modulated, duo-binary 40G-PON (XLG-PON) signal. The simulation results show error-free transmission performance and further distribution to 32 optical network units (ONUs) on broadcast basis with negligible power penalty over 20？km of bidirectional standard single mode fiber. 1. Introduction Service providers and telecom operators are very keen to offer triple-play (video, voice, and data) service on single common broadband passive optical network (PON) infrastructure. The present cost model for optical access only reflects the broadband connections to end users but it is obvious that this fiber setup should be used to distribute the other services such as wireless access and HDTV signals. It is very important to share the high installation cost of fibers between diversified revenue streams. Therefore, the engineering and legal liability to install the fiber network must be supported by as many services as possible [1, 2]. Internet protocol television (IPTV) is becoming a common service for many IP service providers, especially for live television and for video on demand (VOD) [3]. IPTV not only provides the access to the channel programs as does the traditional TV, it also provides interactivity with the network. Moreover, it provides end-to-end service quality compared to internet video that works on “best effort” fashion with no end-to-end service management and quality of service considerations. However, the next challenge for IPTV providers is to enhance the bandwidth capacity to deliver contents in stereoscopic video, which has gained popularity for 3D vision films [4]. At present, the major concern with the IPTV service is the delay in channel selection for live broadcast TV. The channel change response time (CCRT) is defined as the time delay between a viewer asking for a channel change by pressing some buttons on a remote control unit and the display of the selected channel on the TV screen [5]. The CCRT is affected by network operations such as admission control, multicast distribution at routers, and
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