Nonlinear distortion suppression in directly modulated DFB-LD by dual-parallel modulation

A novel method to suppress nonlinear distortion of directly modulated laser diodes using a dual parallel modulation scheme has been proposed. The scheme exploits the fact that frequency chirping influences the phase of RF signals. Two properly controlled undesired intermodulation signals with out-of...

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Bibliographic Details
Published inIEEE photonics technology letters Vol. 14; no. 7; pp. 980 - 982
Main Authors Jung, Hyun-Do, Han, Sang-Kook
Format Journal Article
LanguageEnglish
Published New York IEEE 01.07.2002
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Chirp modulation
Coherence
Diode lasers
Distortion
Intermodulation
Intermodulation distortion
Laser diodes
Modulation
Nonlinear distortion
Nonlinear optics
Nonlinearity
Optical distortion
Optical modulation
Optical refraction
Phase modulation
Radio frequencies
Radio frequency
RF signals
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Summary:A novel method to suppress nonlinear distortion of directly modulated laser diodes using a dual parallel modulation scheme has been proposed. The scheme exploits the fact that frequency chirping influences the phase of RF signals. Two properly controlled undesired intermodulation signals with out-of-phase difference are cancelled via coherent RF recombination at the photodetector. The validity of this scheme was confirmed through experiments. A 20-dB reduction of the third-order intermodulation distortion was achieved and tunability of the suppression region was observed.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
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ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2002.1012405