本文選題：可調(diào)諧 + 單頻��； 參考：《華南理工大學》2015年碩士論文

【摘要】：超高速(400G/1T)相干光通信網(wǎng)絡由于需要更高的傳輸速率和更為復雜的載波調(diào)制格式,而對激光光源模塊有更高的要求——線寬窄(100 k Hz)、信噪比高(40 d B)以及具有波長可調(diào)諧功能。相比于半導體單頻激光器,單頻光纖激光器的線寬更窄、信噪比更高、與光纖元件兼容,有潛力成為超高速相干通信的理想應用光源。本論文對可調(diào)諧單頻光纖激光器進行了深入的實驗研究。構造了滿足ITU-T建議的C波段信道波長輸出的可調(diào)諧單頻光纖激光器。本文具體工作內(nèi)容和取得成果如下:首先,提出了可調(diào)諧單頻激光器的總體設計方案。其具體實現(xiàn)方案包括1)通過控制不同泵浦芯片開關實現(xiàn)不同激射波長的單頻激光輸出,使光纖激光器實現(xiàn)輸出波長粗調(diào)的方案。2)使用高增益的磷酸鹽光纖作為激光增益介質(zhì),縮短諧振腔長,從而使光纖激光器實現(xiàn)單頻激光輸出特性的方案。3)使用精密溫度控制實現(xiàn)單頻光纖激光器輸出波長精確可調(diào)的方案。其次,針對ITU-T建議C波段信道的應用,構建了四個激射不同波長的光纖激光諧振腔,組成可調(diào)諧單頻光纖激光器,并對其不同輸出波長的激光特性開展實驗研究。實驗測得不同波長的激光均能滿足邊模抑制比(SMSR)大于65 d B,功率大于14 m W,相對強度噪聲(RIN)低于-135 d B/Hz,線寬小于3 k Hz,偏振消光比(PER)大于21 d B,而且都有良好的單頻輸出特性。同時為了實現(xiàn)對激光器輸出波長的精確調(diào)諧,分別通過溫度控制和壓電陶瓷(PZT)拉伸窄帶光纖光柵的方式,對單頻光纖激光器波長調(diào)諧特性進行了實驗研究。最后,為了提高可調(diào)諧單頻激光器的輸出功率,對其輸出1535 nm和1550 nm波長的單頻激光進行基于鉺鐿共摻磷酸鹽光纖的放大研究。通過實驗得到了增益光纖最佳使用長度4 cm。經(jīng)功率放大后其輸出激光功率大于20 m W,邊模抑制比大于60 d B,并保留了窄線寬(k Hz量級線寬)單頻光纖激光的優(yōu)勢。該可調(diào)諧單頻光纖激光器具有緊湊的結構,更低的成本,優(yōu)異的性能,有望應用到下一代相干光通信網(wǎng)絡中。
[Abstract]:Because of the need of higher transmission rate and more complex carrier modulation format, the ultra-high speed (400G / 1 T) coherent optical communication network has higher requirements for the laser light source module (100kHz) with a high signal-to-noise ratio (SNR) of 40dB) and wavelength tunable. Compared with semiconductor single-frequency lasers, single-frequency fiber lasers have narrower linewidth and higher signal-to-noise ratio (SNR), which are compatible with fiber components and have the potential to be an ideal light source for ultra-high speed coherent communication. In this paper, the tunable single-frequency fiber laser is studied experimentally. A tunable single-frequency fiber laser satisfying ITU-T 's recommendation for C-band channel wavelength output is constructed. The main contents and achievements are as follows: firstly, the overall design scheme of tunable single frequency laser is proposed. The scheme includes: 1) using high gain phosphate fiber as laser gain medium to realize single frequency laser output with different pumping wavelength by controlling different pump chip switch, and making fiber laser realize output wavelength coarse tuning. The scheme of reducing the length of resonator so that the fiber laser can realize the output characteristic of single frequency laser. 3) using precise temperature control to realize the precise tunable wavelength of single frequency fiber laser. Secondly, four fiber laser resonators with different laser wavelengths are constructed to form tunable single-frequency fiber lasers for the application of C-band channels recommended by ITU-T, and the laser characteristics of different output wavelengths are studied experimentally. The experimental results show that the laser with different wavelengths can satisfy the side mode rejection ratio (SMSRR) greater than 65 dB, the power more than 14 MW, the relative intensity noise (RIN) less than -135 dB / Hz, the linewidth less than 3 kHz, and the polarization extinction ratio (per) > 21 dB, and all of them have good single-frequency output characteristics. At the same time, in order to realize the accurate tuning of the output wavelength of the laser, the wavelength tuning characteristics of the single-frequency fiber laser are studied experimentally by temperature control and PZT-based stretching of narrow-band fiber grating. Finally, in order to improve the output power of tunable single-frequency laser, the amplification of single-frequency laser with output wavelength of 1535 nm and 1550 nm is studied based on erbium-ytterbium co-doped phosphate fiber. The optimum operating length of the gain fiber is 4 cm. After power amplification, the output laser power is more than 20 MW, the edge-mode rejection ratio is more than 60 dB, and the advantages of narrow linewidth (k Hz) single frequency fiber laser are retained. The tunable single-frequency fiber laser with compact structure, lower cost and excellent performance is expected to be used in the next generation coherent optical communication network.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN248

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本文編號：1850286