本論文探討低成本的法布里-比洛雷射二極體鎖模監控系統，以一直接調變數位電視訊號的垂直共振腔面射型雷射為注入鎖模光源，以此光源注入鎖模法布里-比洛雷射二極體，並再直接調變1.25Gbps數據資料進行上行傳輸。考慮到若法布里-比洛雷射二極體注入鎖模波長發生變動時，法布里-比洛雷射如何以低成本的方式來進行鎖模監控的技術。
第一部分使用可調式雷射光源注入隨機選取的兩顆相同的法布里-比洛雷射二極體，將可調式雷射光源波長注入法布里-比洛雷射二極體，於24.4oC時分別對準11個相對模態作注入，發現當旁模抑制比超過36dB時，其模態光功率也來到最高點。此外，每改變0.01nm及測量其輸出光譜的旁模抑制比與模態光功率，發現注入光於鎖模後，往長波長與短波長兩方向的移動，其旁模抑制比與模態光功率的變動趨勢是不一樣的，其中光功率隨波長移動的變化率相差約50dBm/nm。
第二部分改採用垂直共振腔面射型雷射注入法布里-比洛雷射二極體，進行兩種不同的測量，一為改變垂直共振腔面射型雷射的溫度，從22.8 oC開始，每0.1oC量測一次旁模抑制比與模態光功率；二為固定垂直共振腔面射型雷射的溫度於25oC，以溫度控制器改變法布里-比洛雷射二極體的溫度。實驗發現，注入光於法布里-比洛雷射二極體輸出光譜中的相對模態長波長與短波長處，鎖模後旁模抑制比與模態光功率的變動趨勢不一樣的特性。
最後，藉由上述鎖模的特性，探討以做為自動控制技術來監控注入鎖模的狀況，以及在發現波長漂移時，送出溫度修正信號來控制法布里-比洛雷射二極體的熱電冷卻器，調節其溫度，以自動追隨鎖模的機制，來達到低成本鎖模監控系統的目標。

In this thesis, a low-cost automatic injection-locking control system is presented. A vertical cavity surface-emitting laser(VSCEL),which is directly modulated with DVB-T signals, is adopted as an injection source. Using this injection source, a Fébry-Perot laser diode (FP-LD) is injection-locked and is directly modulated with 1.25Gbps NRZ data for upstream transmission. Considering the variation of the injection-locked wavelength of FP-LD, we study an injection-locking control system in a more cost efficient way. In part A , we randomly pick two FP-LDs at the same time, and use a tunable laser as an injection source. Firstly, we focus on the injections on the eleven relative modes of FP-LD at 24.4oC. It is found that when the side mode suppression ratio(SMSR) is above 36dB, the mode power reach the highest value. Secondly, as the injection wavelength changes by 0.01nm, we measure the SMSR and mode optical power of the optical spectrum. From our study of the injection factures, it found that the features of the variations of SMSR and mode power are different as the wavelength increased or decreased. In part B, similar study are made of replacing the tunable laser by a VCSEL. Two kinds of experiments were performed. The first one was performed at several temperatures, staring from 22.8oC to 24.8oC with an increment of 0.1oC. We measure the SMSR and mode power. The second experiment is at a fixed temperature of 25oC for the VCSEL. We change the temperature of FP-LD by a temperature controller. In the experiment, similar conclusion is reached. The injection locking features are different as the wavelength increased or decreased. Finally, using the above mode-locking characteristics, we design a low-cost automatic injection-locking system. As the wavelength of the injection source drift, the control system responds by sensing the output light power of the FP-LD. Then, a correction signal was send to the temperature controlling circuit to vary the wavelength of the FP-LD,until the mode-locking condition are achieved.

[1] M. M.-K. Liu, Principles and Applications of Optical Communications, Irwin Publishers, 1996.
[2] C. H. Lee, “Passive optical networks for FTTx applications,”
OFC/NFOEC, Volume 3, pp.6-11, March 2005.
[3] http://dtvc.org.tw/. 台灣數位電視協會，2008.
[4] 賴柏洲、林志星、魏明照、 林世欽，數位電視廣播與製作系統，
全華科技圖書股份有限公司，台北，2002。
[5] 張恆嘉，[光網路於數位電視廣播之應用]，國立台灣科技大學，
臺北，2008
[6] S. O. Kasap, Optoelectronics and Photonics : Principles and Practices, Prentice Hall Publishers, 2001
[7] D. Derickson, Fiber Optic Test and Measurement, Prentice Hall,
1998
[8] N. Kashima; S. Yamaguchi; S. Ishii, “Optical transmitter using side-mode injection locking for high-speed photonic LANs,” IEEE J. Lightwave Technology, vol. 22 , no.2, pp.550-557, 2004.
[9] S. Mohrdiek, H. Burkhard, H. Walter, “Chirp reduction of directly modulated semiconductor lasers at 10 Gbps by strong CW light injection,” IEEE J. Lightwave Technology, vol. 12, no. 3, pp.418-424, Mar. 1994.
[10] C. Lin, F. Mengel, “Reduction of frequency chirping and dynamic linewidth in high-speed directly modulated,” Electronics Letters, vol. 20, no. 25/26, pp.1073-1075, Dec. 1984.
[11] L. A. Coldren, S. W. Corzine, Diode Lasers and Photonic Integrated Cir cuits, A Wiley-Interscience Publication, 1995
[12] C.A. Stolz; D. Labukhin; N. Zakhleniuk; M.J. Adams, “Locking bandwidth of optically injected Fabry-Perot semiconductor lasers for high injection strengths, “ IET J. Optoelectronics, vol. 2, pp. 223-230,
2008.
[13] J. Wang, M. K. Haldar, L. Li, and F. V. C. Mendis, “Enhancement of modulation bandwidth of laser diodes by injection locking,” IEEE Photonics Technology Letters, vol. 8, no.1, pp. 34 -36, 1996.
[14] S. Mohrdiek, H.Burkhard, and H. Walter, “Chirp reduction of directly modulated semiconductor lasers at 10 Gb/s by Strong CW Light Injection,” J. Lightwave Technology, vol. 12, no. 3, pp. 418 -424, 1994.
[15] L.Y. Chan, C.K. Chan, D.T.K Tong, E. Tong and L. K. Chen, “Upstream traffic transmitter using injection-locked Fabry-Perot laser diode as modulator for WDM access networks,” Electronics Letters, vol. 38, no. 1, pp.43-45, January, 2002.
[16] 賴柏洲、林世欽，數位電視技術原理，全華科技圖書股份有限公
司，台北，2006。
[17] 大通電子，高畫質數位電視接收機: DTV-6200，大通電子股份有
限公司，2007。
[18] E.K. Lau, J.W. Liang , M.C. Wu, “Enhanced modulation characteristics of optical injection-locked lasers: a tutorial,” EEE. J, Selected Topics in Quantum Electronics , vol. 15, no. 3, pp. 618- 633, 2009.
[19] N. Kashima, “Dynamic properties of FP-LD transmitters using side-mode injection locking for LANs and WDM-PONs,” IEEE J. Lightwave Technology, vol. 24, no. 8, pp. 3045-3058, 2006