SOA 锁模7.pdf

676 CHINESE OPTICS LETTERS / Vol. 6, No. 9 / September 10, 2008 40-GHz wavelength tunable mode-locked SOA-based fiber laser with 40-nm tuning range Shuangyi Yan (òòòVVVÀÀÀ )1,2 , Jianguo Zhang (ÜÜÜïïï III)1,3 , and Wei Zhao (ëëë ¥¥¥)1 1State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an 710119 2 Graduate University of Chinese Academy of Sciences, Beijing 100049 3Department of Electrical, Computer and Communications Engineering, London South Bank University, 103 Borough Road, London SE1 0AA, UK Received March 6, 2008 A 40-GHz wavelength tunable mode-locked fiber ring laser based on cross-gain modulation in a semicon- ductor optical amplifier (SOA) is presented. Pulse trains with a pulse width of 10.5 ps at 40-GHz repetition frequency are obtained. The laser operates with almost 40-nm tuning range. The relationship between the key laser parameters and the output pulse characteristics is analyzed experimentally. OCIS codes: 140.3520, 140.4050, 140.3600, 140.3560, 140.0140. doi: 10.3788/CO0676. Optical pulse sources that generate stable picosecond in SOAs. To generate high repetition rate, rational har- pulses are being developed for a variety of applications, monic mode-mocking technology is often used. However, such as ultra-high-bit-rate optical communication sys- this kind of technology will introduce the difference in tems, all optical signal processing, all optical logic cir- amplitude among pulses, and the stability of the pulse cuits, as well as test and measurement systems[1−4]