本文選題：正交頻分復(fù)用 + 渦旋光　； 參考：《上海大學(xué)學(xué)報(自然科學(xué)版)》2017年05期

【摘要】：將高斯光束入射到加載有復(fù)合衍射全息圖的空間光調(diào)制器(spatial light modulator,SLM)上可一次生成多個渦旋光(optical vortex,OV);反之,將相應(yīng)的渦旋光入射到相同全息圖上,便可還原為高斯光,實現(xiàn)渦旋光的解調(diào).由于傳統(tǒng)的渦旋光通信系統(tǒng)中一個全息圖只能解調(diào)一路入射渦旋光,故提出了一種基于復(fù)合衍射全息圖的渦旋光解調(diào)法,該方法能利用一個全息圖解調(diào)多路入射渦旋光,具有較好的應(yīng)用前景.搭建了一個實驗系統(tǒng),實現(xiàn)了16QAMOFDM(quadrature amplitude modulation-orthogonal frequency division multiplexing,正交振幅調(diào)制-正交頻分復(fù)用)光信號的渦旋光生成、傳輸和解調(diào),將解調(diào)后的高斯光經(jīng)過一系列離線處理得到了OFDM信號的星座圖和各個子載波的誤碼率.實驗結(jié)果表明,所有子載波的誤碼率均在前向糾錯(forward error correction,FEC)門限之下,說明該方法具有良好的系統(tǒng)性能.
[Abstract]:When a Gao Si beam is incident into a spatial light modulator (SLM) loaded with a composite diffraction hologram, several optical vortices can be generated at one time, whereas the corresponding vortex light can be reduced to Gao Si light if the corresponding vortex light is incident onto the same hologram. The demodulation of vortex light is realized. Since a hologram can only demodulate the incident vortex light in a traditional vortex optical communication system, a new method based on composite diffraction hologram is proposed. The method can demodulate multi-channel incident vortex light by using a hologram. It has good application prospect. An experimental system is set up to realize the vortex light generation, transmission and demodulation of 16QAMOFDM(quadrature amplitude modulation-orthogonal frequency division multiplexing, quadrature amplitude modulation-quadrature frequency division multiplexing (OFDDM) optical signals. The demodulated Gao Si light is processed off-line to obtain the constellation diagram of the OFDM signal and the bit error rate of each sub-carrier. The experimental results show that the BER of all subcarriers is below the forward error correction threshold, which indicates that the proposed method has good system performance.
【作者單位】： 上海大學(xué)通信與信息工程學(xué)院;
【基金】：國家自然科學(xué)基金資助項目(61420106011) 上海市科技創(chuàng)新行動計劃資助項目(14511100100)
【分類號】：TN929.1

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