Open AccessEnhancing the 3-dB Bandwidth via the Gain-Lever Effect in Quantum-Dot Lasers
Author(s) -
Y. Li,
N. A. Naderi,
V. Kovanis,
L. F. Lester
Publication year - 2010
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2010.2046481
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
We investigate the small-signal modulation response of two-section, gain-lever, quantum-dot semiconductor lasers. A three-pole modulation function is derived from a 3-D set of rate equations, and a 70% 3-dB bandwidth enhancement is computed and experimentally realized in an undoped quantum-dot gain-lever laser under extreme asymmetric-bias conditions. Finally, it is demonstrated that the 3-dB bandwidth is three times the free-running relaxation oscillation frequency in these types of laser structures, as opposed to 1.55 times in the case of conventional single-section lasers.