Abstract
Three different types of distributed-feedback semiconductor optical amplifier (DFB-SOA) are studied: periodic, linearly tapered, and linearly chirped DFB-SOA’s. The features of these amplifiers are as follows: because of weak distributed-feedback structures caused by corrugations, wide bandwidth and high gain can be realized, i.e., higher gain than for traveling-wave-type amplifiers and wider bandwidth than for Fabry–Perot-type amplifiers. Two different applications for these three different types of DFB-SOA can be considered, viz., as transmission and as reflection structures; however, one transmission structure is better than the other. To reduce reflections from the amplifiers to the input side, either linearly tapered coefficients with negative taper or linearly chirped DFB-SOA’s are useful. The noise level (caused by spontaneous emissions) of the proposed amplifiers can be lower than for traveling-wave-type amplifiers because here a lower injection current is required for the same level of amplification to be obtained.
© 1987 Optical Society of America
Full Article | PDF ArticleMore Like This
Makoto Yamada and Kyohei Sakuda
Appl. Opt. 26(16) 3474-3478 (1987)
Xin-Hong Jia
J. Opt. Soc. Am. B 23(12) 2503-2510 (2006)
R. S. Weis and T. K. Gaylord
J. Opt. Soc. Am. A 4(9) 1720-1740 (1987)