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Ultra-narrow Linewidth FBG Cavity DFB Laser with saturable Absorber  

Kim, Jun-Won (경희대학교 대학부 전자공학과)
Jin, Yong-Ok (경희대학교 정보통신대학부)
Choe, Gyu-Nam (텍사스 에이엔엠 대학교 CEMDAS 연구소)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.39, no.5, 2002 , pp. 46-53 More about this Journal
Abstract
A novel ultra-narrow linewidth single longtudinal mode DFB semiconductor laser in the extended FBG cavity is proposed. The 3㏈ linewidth of 20KHz was demonstrated by using self-heterodyne measurement set-up with a fiber delay line of 63km. And this linewidth was further compressed to less than 3KHz, which is resolution limited performance, by inserting E $r^{+3}$ doped fiber saturable absorber. This is equivalent to 3㏈ linewidth of 2$\times$10$^{-8}$ nm.
Keywords
Linewidth; DFB; Saturable Absorber; FBG;
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