Dependence of Mode Partition Characteristics of Laser Diodes on Modulation Frequency and Modulation Code

Masakazu MORI  Akiyuki TAKEDA  Takeshi KAWAI  Mari MIYATA  Toshio GOTO  Nobuhide YAMAGUCHI  

IEICE TRANSACTIONS on Communications   Vol.E74-B   No.2   pp.302-308
Publication Date: 1991/02/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: PAPER
Category: Optical Communication

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The dependence of mode partition characteristics of 1.3 µm Fabry-Perot laser diodes on the modulation frequency and the modulation code has been investigated. From measurements with the frequency domain method and a simple analysis, it is confirmed that the modulation frequency dependence of k-value is caused by a competition among longitudinal modes which occurs with a time constant of several nano seconds. The mode partition characteristics in NRZ code is more affected by this mode competition than that in RZ code. Nevertheless, the k-value in NRZ code at modulation frequency fb is about the same as that in RZ code at modulation frequency fb/2. A simple formula which gives the k-value as a function of the modulation frequency is derived.