本文選題：DPSK光調(diào)制 + 相位噪聲��； 參考：《長春理工大學(xué)》2017年碩士論文

【摘要】：自由空間光通信是目前通信領(lǐng)域的研究熱點(diǎn)和前沿,在眾多適用于自由空間光通信系統(tǒng)的調(diào)制格式中,DPSK光調(diào)制格式最受關(guān)注。但是,DPSK光調(diào)制碼型采用相位攜帶信息,對(duì)相位噪聲很敏感,相位噪聲造成信號(hào)相位的起伏會(huì)使信息失真,限制傳輸距離。本文重點(diǎn)分析DPSK光調(diào)制系統(tǒng)中產(chǎn)生相位噪聲的主要因素并加以補(bǔ)償,使系統(tǒng)中的相位噪聲減小,發(fā)射性能得到提升。本文根據(jù)DPSK光信號(hào)的調(diào)制原理,完成了以下工作:(1)設(shè)計(jì)自由空間光通信DPSK調(diào)制系統(tǒng),并通過光學(xué)仿真軟件Optisystem驗(yàn)證此系統(tǒng)在理想條件下的可行性;(2)分析系統(tǒng)相位噪聲的主要來源,得出系統(tǒng)中產(chǎn)生相位噪聲的主要因素為:半導(dǎo)體激光器線寬展寬、半導(dǎo)體激光器頻率漂移以及相位調(diào)制器半波電壓隨溫度發(fā)生變化;(3)研究系統(tǒng)相位噪聲的補(bǔ)償方法。采用閃耀光柵外腔反饋線寬補(bǔ)償技術(shù),通過延長半導(dǎo)體激光器的有效腔長減小其線寬,對(duì)由半導(dǎo)體激光器線寬展寬產(chǎn)生的相位噪聲進(jìn)行補(bǔ)償;采用聲光偏頻無調(diào)制頻率補(bǔ)償技術(shù),通過控制激光器有效腔長的改變穩(wěn)定激光頻率,對(duì)由半導(dǎo)體激光器頻率漂移產(chǎn)生的相位噪聲進(jìn)行補(bǔ)償;采用數(shù)字PID半波電壓補(bǔ)償技術(shù),控制調(diào)制器的驅(qū)動(dòng)電壓,使其峰峰值始終等于調(diào)制器半波電壓,對(duì)由相位調(diào)制器半波電壓隨溫度變化產(chǎn)生的相位噪聲進(jìn)行補(bǔ)償;(4)通過仿真與實(shí)驗(yàn)對(duì)系統(tǒng)相位噪聲補(bǔ)償技術(shù)的可行性進(jìn)行驗(yàn)證,最后通過相位噪聲補(bǔ)償前后系統(tǒng)輸出信號(hào)星座圖和眼圖的對(duì)比,對(duì)系統(tǒng)的整體性能進(jìn)行了分析。實(shí)驗(yàn)結(jié)果表明,在對(duì)系統(tǒng)中相位噪聲的主要來源進(jìn)行補(bǔ)償之后,提高了系統(tǒng)輸出信號(hào)的穩(wěn)定性,系統(tǒng)誤碼率得到改善,發(fā)射性能得到很大提升,由此說明本設(shè)計(jì)的正確性。
[Abstract]:Free space optical communication is the research hotspot and frontier in the field of communication. Among the many modulation formats suitable for free space optical communication systems, DPSK optical modulation format has attracted the most attention. However, the DPSK optical modulation code uses phase to carry information, which is very sensitive to phase noise. The fluctuation of signal phase caused by phase noise will make the information distorted and limit the transmission distance. In this paper, the main factors that produce phase noise in DPSK optical modulation system are analyzed and compensated, so that the phase noise in the system is reduced and the emission performance is improved. According to the modulation principle of DPSK optical signal, the following work has been accomplished: 1) designing the DPSK modulation system for free space optical communication, and verifying the feasibility of the system under ideal conditions by Optisystem.) analyzing the main source of phase noise in the system. It is concluded that the main factors to produce phase noise in the system are: linewidth broadening of semiconductor laser, frequency drift of semiconductor laser and half-wave voltage of phase modulator changing with temperature) the compensation method of phase noise in the system is studied. By extending the effective cavity length of the semiconductor laser and reducing the linewidth, the phase noise caused by the linewidth broadening of the semiconductor laser is compensated by using the feedback linewidth compensation technique of blazed grating external cavity. The phase noise caused by frequency drift of semiconductor laser is compensated by controlling the effective cavity length of the laser to compensate the phase noise generated by the frequency drift of semiconductor laser, and the digital pid half-wave voltage compensation technique is adopted. Control the driving voltage of the modulator so that its peak value is always equal to the half wave voltage of the modulator. The phase noise caused by the change of the half-wave voltage of the phase modulator with temperature is compensated. The feasibility of the system phase noise compensation technique is verified by simulation and experiment. Finally, the overall performance of the system is analyzed by comparing the constellation and eye diagram of the output signal before and after the phase noise compensation. The experimental results show that after compensating the main sources of phase noise in the system, the stability of the system output signal is improved, the bit error rate of the system is improved, and the transmission performance is greatly improved, which shows the correctness of the design.
【學(xué)位授予單位】：長春理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN929.1

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