【作者】 王昊；

【导师】 陈向飞； 姜校顺；

【作者基本信息】 南京大学 ， 光学工程（专业学位）， 2018， 硕士

【摘要】 随着信息爆炸和大数据时代的来临,社会对信息传输的要求日益升高。高速的信息传输,尤其是愈加灵活的智能化通信网络代表了光通信未来的发展方向。高带宽,工作稳定,低成本的可调谐激光器将会在此过程中起到日益重要的作用,此外可调谐激光器在相控阵雷达、气体监测、传感、测量等其他非通信领域的市场也在逐年扩大。然而目前可调谐激光器的前沿技术仍然掌握在国外的企业之中,导致可调谐激光器的价格较高(单价可达数百美元),因此研制低成本的可调谐激光器具有重要意义。本文从光纤通信引入,介绍了可调谐激光器的原理以及在当今通信系统和其他应用场景中的重要作用。然后通过对REC技术的介绍,说明了基于REC技术的可调谐激光器具有工艺相对简单、制作成本较低的优点,这使得低成本的可调谐激光器的实现成为可能。接着研究了集成半导体光放大器的串联电流可调谐DFB激光器。在25℃时,每个激光器在注入电流从30mA增加到170mA时,可以调谐的范围分别是4.3nm、4 nm和4.4nm,边模抑制比超过35 dB。得到了 50 GHz通道间隔的23个通道,波长调谐范围从1554.13nm到1562.93 nm。在下一代光通信智能网络中,系统对可调谐激光器在波长切换速度方面提出了更高的要求,激光器的波长切换速度在一定程度上影响着光通信的灵活度。因此本文还对串联可调谐半导体激光器的波长切换时间进行了研究和测量。测量系统是基于两臂长几乎相等的马赫-增德尔光纤干涉仪。测量从理论和实验方面进行了研究。实验结果得以呈现和讨论,这将有助于该类型可调谐激光器的测试及封装优化。更多还原

【Abstract】 With the advent of information explosion and the era of big data,social requirements for information transmission are getting higher and higher.High-speed transmission rate,especially the more flexible and intelligent communication network,has become the development direction of the optical communication.High-bandwidth,stable operation and low-cost tunable lasers will play an increasingly important role in this process.In addition,tunable lasers are also used in other non-communication fields such as phased-array radar,gas monitoring,sensing and measurement.The market is expanding year by year.However,the state-of-art of tunable lasers is still dominated by foreign companies,which results in high price for tunable lasers(the price can reach several hundred dollars).Therefore,it is of great significance to develop low-cost tunable lasers.This paper starts with fiber-optical communication,then it clarifies the principle of tunable lasers and the important role tunable lasers play in today’s communication and non-communication systems.Then through the introduction of reconstruction equivalent chirp(REC)technology,it shows that semiconductor distributed feedback(DFB)laser based on REC technique has the advantage of relatively simpler process and lower production cost,which makes the production of low-cost tunable lasers possible.Multi-section in-line tunable DFB laser integrated with semiconductor optical amplifier(SOA)tuned by injection current is investigated.When the temperature is controlled at 25℃ and the injection current is increased from 30 mA to 170 mA,each laser can be tuned about 4.3nm,4nm and 4.4nm.The side mode suppressing ratios(SMSRs)exceed 35dB.Twenty-three channels of 50 GHz channel spacing are obtained,the wavelength tuning range is from 1554.13nm to 1562.93nm.In the next-generation optical communication intelligent network,the system putsforward higher requirements on the wavelength switching speed of the tunable lasers.To some extent,the wavelength switching speed affects the flexibility of optical communication network.The wavelength-switching time of the in-line tunable semiconductor laser is studied and measured.The measurement system is based on the Mach-Zehnder interferometer(MZI)with two arms having almost the same length.The measurements are studied both in theory and experiments.All the results are presented and discussed,to help the optimization of testing and packaging such tunable lasers in future.更多还原