发明名称 |
Pulse shaping of optical duobinary signals |
摘要 |
<p>A duobinary optical communication system is disclosed that employs pulse amplitude modulation (PAM) techniques to provide further improvements in spectral efficiency. A disclosed PAM duobinary optical transmitter converts a plurality of input bits to an N level signal using PAM techniques; adds a current N level signal to a previous N level signal to produce a 2N-1 level signal; and converts the 2N-1 level signal to an optical signal for transmission to a receiver. A disclosed PAM duobinary optical receiver detects a power level of the received optical signal (encoded using pulse amplitude modulation and duobinary encoding techniques to encode a plurality of bits) and maps the detected power level to a plurality of bits to return the transmitted information. An exemplary PAM-4 duobinary optical communication system combines PAM-4 modulation techniques with duobinary pulse shaping techniques to provide an overall factor of four improvement in spectral efficiency by reducing the bandwidth of the optical signal.</p> |
申请公布号 |
EP1401129(A2) |
申请公布日期 |
2004.03.24 |
申请号 |
EP20030255916 |
申请日期 |
2003.09.22 |
申请人 |
AGERE SYSTEMS INC. |
发明人 |
AZADET, KAMERAN;SAIBI, FADI RYAD OLIVIER |
分类号 |
H04B10/18;H04B10/155;H04B10/158;(IPC1-7):H04B10/18 |
主分类号 |
H04B10/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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