청색 LED 가시광 통신을 이용한 홀로그램 영상 전송 데니 달라스, 김용현, 윌리 아누그라흐 차흐야디, 정연호* 부경대학교 Denny.darlis@tass.telkomuniversity.ac.id, gokyh123@gmail.com, wac.zze@gmail.com, *yhchung@pknu.ac.kr Holographic image transmission using blue LED visible light communications Denny Darlis, Yong Hyeon Kim, Willy Anugrah Cahyadi, Yeon Ho Chung* Pukyong National University Abstract In this paper, a computer generated hologram image was transmitted using a high power blue LED in a visible light communication (VLC) system. At the receiver side, a Fresnel lens was used to collimate the ray of lights with the data transmitted over 1 m distance. The transmitted hologram images were reconstructed using a reconstruction software. The results show that the proposed VLC based holographic image transmission is viable and can be used for future 3D hologram transmission. Ⅰ. Introduction Massive bandwidth is needed for a 3D hologram video transmission, since several images with a large amount of pixels are transmitted simultaneously. For a realistic digital hologram video, even a small dimension 3D object, such as 5 cm 3 , it requires approximately 32 megapixels of the image data. Therefore, if an 8-bit intensity modulation and 30 frames per second hologram image is transmitted, it would require a data rate of up to approximately 7.68 G bps [1]. Studies on visible light communication (VLC) have recently demonstrated the potentiality of multi-gigabit transmission using complex modulation techniques where a laser with diffused light is used as a light source and a sensitive PIN photodiode is employed as a detector [2,3]. One of the suitable applications today for VLC systems can be to broadcast digital data to several users. The present work investigates a VLC system to transmit a 3D hologram image. An experimental reconstruction was performed on the receiver side. In this work, a computer generated hologram format is only considered for representing a 3D object recorded on a holographic plate using on-axis Fresnel holography. After transmitted through the VLC channel, the transmitted image is reconstructed using a common optical setup to display the holographic image under ambient light. The rest of this paper is organized as follows. Section II describes the system configuration. Section III presents the results and discussion. Finally, conclusions are drawn in Section IV. Ⅱ. System Configuration Figure 1 shows the complete system configuration. We transmit a 3D-CGH pattern through a 1W blue LED transmitter. The hologram binary pattern is fed directly without any additional amplifier both on the transmitter and the receiver. Figure 1. Holographic VLC transmission system. The controller converts the pattern into the binary data and the data are transmitted through the VLC transmitter employing a high-intensity blue LED with OOK modulation. The data are then received by the VLC receiver, which is a light-to-voltage optical sensor. The received data is converted back to the hologram pattern. This received hologram pattern can be reconstructed by an optical arrangement that can display any hologram pattern, such as a 1280 x 720 2016 137