Document Details

Document Type : Article In Journal 
Document Title :
Theoretical analysis of modecompetition noise in modulated laser diodes and its influence on the noise performance of fibre links
Theoretical analysis of modecompetition noise in modulated laser diodes and its influence on the noise performance of fibre links
 
Subject : physics 
Document Language : English 
Abstract : We analyse modecompetition (MC) noise in sinusoidally modulated laser diodes and assess its contribution to the noise performance of directly modulated fibre links. The noise figure (NF) is used to evaluate the noise performance of the link. The present analyses are based on a multimode rate equation model that takes into account both symmetric and asymmetric suppressions of the crossmodal gain. Variations of the MC relative intensity noise of both the total output and the oscillating modes with modulation conditions are investigated. The obtained results show that regardless of the fact that the nonmodulated laser oscillates nearly in singlemode or in twomode hopping, the modulated laser oscillates in single mode when the signal is continuous, and converts into multimode when the signal is pulsing. The contribution of MC noise to the NF of the link increases with an increase in the modulation depth and with a decrease in the modulation frequency, except when the signal has period doubling. This contribution is negligible under high modulation frequencies when the laser signal is continuous and uniform, and is most enhanced (similar to 53 dB) under low modulation frequencies when the signal is pulsing and superposed with nonuniform relaxation oscillations. 
ISSN : 00223727 
Journal Name : JOURNAL OF PHYSICS DAPPLIED PHYSICS 
Volume : 45 
Issue Number : 40 
Publishing Year : 1433 AH
2012 AD 
Article Type : Article 
Added Date : Saturday, July 22, 2017 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
Moustafa Ahmed,Ahmed,, Moustafa InvestigatorDoctoratemostafa.hafez@science.miniauniv.edu.eg
Minoru) YamadaYamada, Minoru) ResearcherDoctorate 

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