Open AccessTravelling wave analysis on high-speed performance of Q-modulated distributed feedback laser
Author(s) -
Jiankun Zhi,
Hongli Zhu,
Dekun Liu,
Lei Wang,
JianJun He
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.002277
Subject(s) - extinction ratio , optics , modulation (music) , laser , phase modulation , materials science , reflector (photography) , modulation index , physics , pulse width modulation , power (physics) , acoustics , wavelength , phase noise , light source , quantum mechanics
The structure of a Q-modulated distributed feedback laser is designed and simulated. A large reflectivity modulation of the rear reflector is achieved by using an anti-resonant cavity formed by two deep trenches with the one between the modulator and phase section filled by a high index dielectric material. The travelling wave model is presented to analyze the high speed performance of the laser. Due to the effect of the wave propagation in the structure, the modulation extinction ratio decreases with increasing cavity length. It is shown that 40 Gb/s RZ signal modulation can be achieved with an extinction ratio of 7 dB and 10 dB, respectively, for a cavity length of 500 μm and 300 μm.