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SYSTEM FOR ACHIEVING MULTIPLE BITS PER SYMBOL IN OPTICAL COMMUNICATIONS SYSTEMS BY COMBINING SPATIAL DOMAIN MULTIPLEXING AND PULSE AMPLITUDE MODULATION
SYSTEM FOR ACHIEVING MULTIPLE BITS PER SYMBOL IN OPTICAL COMMUNICATIONS SYSTEMS BY COMBINING SPATIAL DOMAIN MULTIPLEXING AND PULSE AMPLITUDE MODULATION
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机译:通过将空间域复用和脉冲振幅调制相结合来在光学通信系统中实现每个符号多个位的系统
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摘要
A modified optical PAM communication system using multiple laser sources to generate each amplitude level. The systems can be applied separately or in conjunction with another modulation system such as SDM, MDM, WDM, TDM, or other communication systems. In an embodiment, a PAM-4 system will increase data rate by a factor of two, but more complicated schemes using more lasers can be utilized to generate higher efficiency schemes. For example, a 25 Gbps NRZ signal will give 50 Gbps PAM-4 signal and higher laser systems can generate PAM-8 or PAM-16 for 75 and 100 Gbps systems respectively. These can be further applied to SDM systems to generate higher data rates equivalent to the number of SDM channels multiplied by the PAM efficiency. In embodiments, the invention may combing PAM with WDM and SDM to achieve multiple bits per symbol.
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