发明名称 |
Transmission and reception of duobinary multilevel pulse-amplitude-modulated optical signals using finite-state machine-based encoder |
摘要 |
Methods and 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 PAM 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 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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申请公布号 |
US6424444(B1) |
申请公布日期 |
2002.07.23 |
申请号 |
US20010774288 |
申请日期 |
2001.01.29 |
申请人 |
STRATALIGHT COMMUNICATIONS, INC. |
发明人 |
KAHN JOSEPH MARDELL;HO KEANGPO |
分类号 |
H04B10/12;H04B10/148;H04B10/155;H04B10/158;H04L25/49;(IPC1-7):H04B10/12;H04B10/04 |
主分类号 |
H04B10/12 |
代理机构 |
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主权项 |
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