Multilevel subcarrier multiplexing in optical fiber communications
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PublisherThe University of Arizona.
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AbstractThe primary aim of the thesis is to determine the spectrum efficiency and power penalty of multi-level Subcarrier Multiplexing (SCM) transmission. To perform quantitative analysis, this thesis first develops a fiber transmission model. When there is one SCM transmission channel, it is found that the power penalty due to multi-level is 5 dB per bit at the same bit error rate (BER). For multiple channel SCM transmission, to reduce adjacent channel interference (ACI), it is found that binary transmission has the best spectrum efficiency for Non-Return-to-Zero (NRZ) pulses at the same BER. However, if raised-cosine pulses are used, 32-ary transmission is found to be the most efficient in spectrum use because of the smaller ACI.