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TRANSMISSION AND RECEPTION OF DUOBINARY MULTILEVEL PULSE-AMPLITUDE-MODULATED OPTICAL SIGNALS USING FINITE-STATE MACHIEN-BASED ENCODER
TRANSMISSION AND RECEPTION OF DUOBINARY MULTILEVEL PULSE-AMPLITUDE-MODULATED OPTICAL SIGNALS USING FINITE-STATE MACHIEN-BASED ENCODER
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机译:使用基于有限状态马其安编码器的双二元多级脉冲幅度调制光学信号的传输和接收
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摘要
Methods an apparatus to transmit and receive information bits encoded in duobinary, multilevel pulse-amplitude-modulated (PAM) optical signals are described. The transmitted optical signal has a narrow optical spectrum and a low symbol rate. Information bits are encoded in a M-ary PAM symbol sequence, where M 2. The P AM symbol sequence is input to a finite-state machine, which yields an encoded sequence that changes sign between two symbol intervals when the encoded sequence takes on a nominally zero value during an odd number of intervening symbol intervals. The encoded sequence is lowpass filtered and modulated onto an optical electric field. The receiver (20) processes a received optical electric field to obtain an electrical signal proportional to the received optical intensity, and performs M-ary symbol-by-symbol decisions to recover the transmitted information bits, without potential error propagation.
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