With the expansion of researches towards the 5th generation of the wireless communication systems, using visible light communications for transmitting the information become more important. Visible light communications, which use the range of wavelengths between 380 to 750 nm, have some advantages such as higher power efficiency, higher bandwidth efficiency and more data rates than radio frequency communication. The transmission speed in visible light communication is 66 times more than RF based systems. Orthogonal frequency division multiplexing is a kind of modulation which have attracted attentions these days because it is an effective solution to the inter symbol interference problem. However, one of the disadvantages of this modulation is high peak to average power ratio (PAPR). In this thesis, we have proposed a new scheme to reduce PAPR in orthogonal frequency division multiplexing in visible light communications. this idea afforded us the chance of considering the requairements of sending and recieving informations through the optical channels. in this idea, first of all, we clipp the signal in a thershold level. The clipped error informations are kept and repositioned in their own previous positions. finally we prepare a bitstream consists of domain and sign informations which leads to correct detection in the receiver. then we convert this bitstream to a time domain signal and after a time multiplexing, it will send with the main siganl. Simulation results show that the proposed scheme achieves peak to average power ratio reduction with almost no loss of information and with good performance in bit error ratio and low complexity.