Large Enhancement of Linearity in Electroabsorption Modulator with Composite Quantum-Well Absorption Core

Yong-Duck CHUNG  Young-Shik KANG  Jiyoun LIM  Sung-Bock KIM  Jeha KIM  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E88-C   No.5   pp.967-972
Publication Date: 2005/05/01
Online ISSN: 
DOI: 10.1093/ietele/e88-c.5.967
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Section on Recent Progress in Optoelectronics and Communications)
Category: Optical Active Devices and Modules
Keyword: 
electroabsorption modulator,  linear transfer function,  composite quantum-well,  SFDR,  

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Summary: 
We proposed a novel structure that improved the linear characteristics of electroabsorption modulator (EAM) with composite quantum-wells as an absorption core layer. We fabricated three types of EAM's whose active cores were 8 nm thick, 12 nm thick and a composite core with 8 nm thick and 12 nm thick quantum-well (QW), respectively. The transfer functions of EAM's were investigated and their third-order inter-modulation distortion (IMD3) was obtained by calculation. The spurious free dynamic range (SFDR) was measured and compared with three types of QW. The linearity of the device with composite quantum-well showed a large enhancement in SFDR by 9.3 dBHz2/3 in TE mode and 7.0 dBHz2/3 in TM mode compared with the conventional EAM.