Numerical Study of APSK Format for Long-Haul Transmission and Its Performance Improvement by Zero-Nulling Method

Hidenori TAGA  Jyun-Yi WU  Wei-Tong SHIH  Seng-Sheng SHU  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.7   pp.2165-2168
Publication Date: 2008/07/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.7.2165
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Joint Special Section on Opto-electronics and Communications toward NGN and beyond)
optical fiber communication,  amplitude shift keying,  phase shift keying,  numerical simulation,  

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Transmission performance of amplitude and phase shift keying (APSK) format is studied theoretically. The extinction ratio of the amplitude shift keying (ASK) signal of the APSK format causes a trade-off of the performance between the ASK and the phase shift keying (PSK) signal of the APSK format. Then, zero-nulling method is proposed to improve the performance of the APSK format, and its effectiveness is confirmed by the numerical simulation.