DocumentCode :
1399833
Title :
Theoretical and Experimental Investigation of the Incident-Power-Dependent Extinction Ratio of an Electroabsorption Modulator Integrated With a Distributed Feedback Laser
Author :
Fujisawa, Takeshi ; Yamanaka, Takayuki ; Tadokoro, Takashi ; Fujiwara, Naoki ; Arai, Masakazu ; Kobayashi, Wataru ; Kawaguchi, Yoshihiro ; Tsuzuki, Ken ; Kano, Fumiyoshi
Author_Institution :
Photonics Labs., NTT Corp., Atsugi, Japan
Volume :
47
Issue :
1
fYear :
2011
Firstpage :
60
Lastpage :
65
Abstract :
We have found that the extinction ratio (ER) of an electroabsorption modulator integrated with a distributed feedback laser strongly depends on the incident power to the modulator. Our theoretical consideration based on full device simulation reveals that the temperature change in the modulator dominates the phenomenon. To obtain the intrinsic extinction characteristics of the modulator, we use microscopic theory, which takes into account quantum mechanical many-body interactions in semiconductors and makes it possible to exclude unknown experimental fitting parameters. A heat-flux analysis is performed for the calculation of the temperature distribution in the entire device. As the incident power to the modulator increases, the photocurrent also increases, leading to an increase in the temperature of the modulator by some tens of degrees Celsius by Joule heating. The increase red-shifts the absorption spectrum of the modulator, and the detuning, which is the difference between the lasing wavelength and the band-edge wavelength of the modulator, becomes small, leading to a larger ER. The calculated results are in good agreement with the experiment, showing the validity of our discussion, and indicate that the ER of electroabsorption modulators is strongly affected by the internal heating of the device.
Keywords :
distributed feedback lasers; electro-optical modulation; heat treatment; integrated optics; optical tuning; quantum well devices; red shift; semiconductor lasers; Joule heating; detuning; distributed feedback laser; electroabsorption modulator; heat-flux analysis; incident-power-dependent extinction ratio; integrated optics; microscopic theory; photocurrent; quantum mechanical many-body interactions; red shift; semiconductor device; Absorption; Erbium; Heating; Laser theory; Modulation; Photonics; Electroabsorption modulator; heat-flux simulation; microscopic theory; quantum well;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/JQE.2010.2073448
Filename :
5662957
Link To Document :
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