Design of a monolithic tunable laser based on equivalent-chirp grating reflectors |
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| Authors: | Dai Yitang Xu Kun Wu Jian Li Yan Hong Xiaobin Guo Hongxiang Lin Jintong |
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| Institution: | Key Laboratory of Information Photonics and Optical Communications (Beijing University of Posts and Telecommunications), Ministry of Education, P.O. Box 55 (BUPT), Beijing 100876, China. ytdai@bupt.edu.cn |
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| Abstract: | A Vernier-tuned distributed Bragg reflector (DBR) semiconductor laser is an effective monolithic approach for wide wavelength tunability, at the expense, however, of costly electron-beam lithography during fabrication. In this Letter, a tunable laser design with equivalent-chirp based, flat-top envelope grating reflectors is proposed that can be implemented easily by conventional two-beam interference lithography. The principle is described, and a detailed design shows uniform output power (0.08 dB variation) and excellent side-mode suppression ratio (47 dB minimum) within a wide tuning range (>32 nm) through numerical simulation. |
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