Fiber Optical CATV System Performance Improvement by Using Push-Pull Modulated DFB Laser Diodes

Hai-Han LU
Shah-Jye TZENG
Wen-Jen WANG
Hsiang-Chun PENG
Ching-Yi CHEN

Publication
IEICE TRANSACTIONS on Communications   Vol.E88-B    No.3    pp.1260-1263
Publication Date: 2005/03/01
Online ISSN: 
DOI: 10.1093/ietcom/e88-b.3.1260
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Fiber-Optic Transmission for Communications
Keyword: 
direct modulation,  half-split-band,  push-pull modulation,  

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Summary: 
A directly modulated AM-VSB CATV erbium-doped fiber amplifier (EDFA)-repeated system that uses push-pull modulated distributed feedback (DFB) laser diodes and half-split-band technique is proposed and demonstrated. Push-pull modulation scheme enhances the frequency response of the laser diode, and thus improves the overall performance of the fiber optical CATV systems. Good performances of carrier-to-noise ratio (CNR), composite second order (CSO), and composite triple beat (CTB) were achieved for the full channel band over a 100-km single-mode fiber (SMF) transport.