Reducing Clipping-Induced Distortion in an Optical Cable TV System by Using Carrier Phase Locking

Takuya KURAKAKE
Mikio MAEDA
Yasuhiro ITO
Naoyoshi NAKAMURA
Kimiyuki OYAMADA

Publication
IEICE TRANSACTIONS on Communications   Vol.E81-B       pp.1941-1943
Publication Date: 1998/10/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Category: Optical Communication
Keyword: 
laser-clipping-induced distortion,   SCM,   carrier phase locking,   cable television,  

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Summary: 
We propose a method of reducing laser-clipping-induced distortion in a subcarrier multiplexed (SCM) optical-cable TV system. This scheme reduces amplitude peaks of the SCM signal by controlling the phases of video carriers to prevent the clipping which occurs when these peaks fall below the threshold of a laser-diode. It is experimentally shown that using this method reduces the bit error rate in an AM-VSB / QAM hybrid optical-transmission system.