Options
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.
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
File(s)
No Thumbnail Available
Name
ntu-95-R93942083-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):f0ec1de92ef675d3e67aa57aa4a1d613