Chirp Effect of Semiconductor Diode Lasers and Its Application and Impact on Lightwave Transmission
Date Issued
2006
Date
2006
Author(s)
Chen, Hao-Kai
DOI
zh-TW
Abstract
Semiconductor laser change the output light intensity with an modulated voltage or current. However, the signal output phase or frequency also changes to give a dynamic chirp effect. Combined with chromatic dispersion, chirp effect typically limits the transmission distance of an optical signal.
In this thesis, we focus on the chirp effect of directly-modulated semiconductor laser (DML) and external modulators such as Electro-Absorption Modulator (EAM) and Mach-Zenhder Modulator (MZM). The analyzed and measured results are used to investigate the impact of chirp to a lightwave transmission system.
From experimental measurement, directly-modulated semiconductor has severe chirp effect that limits the transmission dispersion when interacting with fiber chromatic dispersion. The chirp effect is suppressed by passing a directly-modulated signal through a narrow-band optical filter to convert the frequency-modulated signal to on-off keying signal. The transmission distance is extended from 20 to over 60 km.
Subjects
啁啾
頻率鍵移
開關鍵移
調變器
chirp
FSK
OOK
optical modulation
Type
thesis
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