本文選題：零差相干光通信　切入點(diǎn)：光混頻器　出處：《光學(xué)精密工程》2017年07期

【摘要】：為了進(jìn)一步提高零差相干光通信系統(tǒng)的接收靈敏度,對(duì)空間光混頻器的信號(hào)光分光比進(jìn)行了優(yōu)化。根據(jù)零差相干通信系統(tǒng)數(shù)學(xué)模型,推導(dǎo)了信號(hào)光分光比和環(huán)路相位誤差、通信誤碼率的數(shù)學(xué)表達(dá)式,經(jīng)過(guò)計(jì)算分析可知當(dāng)光混頻器Q支路的信號(hào)光滿足鎖相環(huán)要求時(shí),可通過(guò)提高I支路信號(hào)光分光比來(lái)降低誤碼率和提高接收靈敏度。在分光比優(yōu)化后光混頻效率提高了53.5%,通信探測(cè)靈敏度提高了3dB。利用VPI軟件進(jìn)行建模仿真,得到不同分光比下系統(tǒng)的眼圖和相位噪聲功率。仿真結(jié)果顯示,探測(cè)靈敏度提高了2.83dB。最后,搭建了零差相干光通信桌面實(shí)驗(yàn)系統(tǒng),研究了空間光混頻器分光比和系統(tǒng)誤碼率、鎖相環(huán)工作的影響規(guī)律,當(dāng)分光比由0.5減小至0.2時(shí),系統(tǒng)誤碼率由3.53×10~(-9)下降至4.25×10~(-10),當(dāng)分光比為0.1時(shí),鎖相環(huán)失鎖,誤碼率為1。實(shí)驗(yàn)結(jié)果基本符合理論和仿真結(jié)果,所得分光比的影響規(guī)律和優(yōu)化結(jié)果將為空間零差相干通信系統(tǒng)的研制提供技術(shù)參考。
[Abstract]:In order to further improve the reception sensitivity of the coherent optical communication system, the signal to light splitting ratio of the spatial optical mixer is optimized. According to the mathematical model of the homodyne coherent communication system, the signal optical splitting ratio and the loop phase error are derived. The mathematical expression of communication bit error rate (BER) is calculated and analyzed. When the signal light of Q branch of optical mixer meets the requirement of PLL, The error rate and the receiving sensitivity can be reduced by increasing the I branch signal optical separation ratio. The optical mixing efficiency is increased by 53.5and the communication detection sensitivity is improved by 3dB after the optical separation ratio is optimized. The modeling and simulation are carried out by using VPI software. The system's eye diagram and phase noise power are obtained under different optical splitting ratios. Simulation results show that the detection sensitivity is increased by 2.83 dB. Finally, a coherent homodyne optical communication desktop experimental system is built, and the optical splitting ratio of spatial optical mixers and the bit error rate of the system are studied. The effect of PLL operation is that the BER of the system decreases from 3.53 脳 10 ~ (-9) to 4.25 脳 10 ~ (10) ~ (-10) when the ratio of light splitting to light is reduced from 0.5 to 0.2. When the ratio is 0.1, the phase-locked loop loses its lock and the error rate is 1.The experimental results are in good agreement with the theoretical and simulation results. The influence of the ratio and the optimized results will provide a technical reference for the development of the spatial homodyne coherent communication system.
【作者單位】： 長(zhǎng)春理工大學(xué)光電工程學(xué)院;長(zhǎng)春理工大學(xué)空間光電技術(shù)國(guó)家與地方聯(lián)合工程研究中心;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(No.91438204) 吉林省教育廳基金資助項(xiàng)目(吉教科合字,2015,第77號(hào)) 吉林省優(yōu)秀青年人才項(xiàng)目(No.20170520161JH)
【分類號(hào)】：TN773;TN929.1

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