Open AccessPerformance evaluations of hybrid modulation with different optical labels over PDQ in high bit-rate OLS network systems
Author(s) -
Ming Xu,
Y Li,
TangZhen Kang,
T S Zhang,
Junkai Ji,
Shuwen Yang
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.026228
Subject(s) - pulse position modulation , modulation (music) , payload (computing) , phase shift keying , computer science , electronic engineering , phase modulation , quadrature amplitude modulation , extinction ratio , pulse amplitude modulation , keying , bit error rate , optics , physics , telecommunications , computer network , engineering , phase noise , pulse (music) , decoding methods , wavelength , acoustics , detector , network packet
Two orthogonal modulation optical label switching(OLS) schemes, which are based on payload of polarization multiplexing-differential quadrature phase shift keying(POLMUX-DQPSK or PDQ) modulated with identifications of duobinary (DB) label and pulse position modulation(PPM) label, are researched in high bit-rate OLS network. The BER performance of hybrid modulation with payload and label signals are discussed and evaluated in theory and simulation. The theoretical BER expressions of PDQ, PDQ-DB and PDQ-PPM are given with analysis method of hybrid modulation encoding in different the bit-rate ratios of payload and label. Theoretical derivation results are shown that the payload of hybrid modulation has a certain gain of receiver sensitivity than payload without label. The sizes of payload BER gain obtained from hybrid modulation are related to the different types of label. The simulation results are consistent with that of theoretical conclusions. The extinction ratio (ER) conflicting between hybrid encoding of intensity and phase types can be compromised and optimized in OLS system of hybrid modulation. The BER analysis method of hybrid modulation encoding in OLS system can be applied to other n-ary hybrid modulation or combination modulation systems.