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The authors propose a novel architecture of passive optical network (PON), which consists of time division multiplexing (TDM) based downstream (10  Gbit/s) and quasi-synchronization (Q-S) electrical code division multiplexing access (ECDMA) based upstream (2.5  Gchip/s), and realize the prototype of this TDM-ECDMA PON. The high speed (2.5  Gchip/s) all digital en/decoding of upstream have been achieved by field-programmable gate array in this prototype. The frames error rate (FER) free transmission of Q-S ECDMA based upstream is demonstrated after 20 km fiber link. Then receiver sensitivity of optical line terminal in upstream transmission can be improved ∼ 6  dB by coding gain compared with traditional 2.5  Gbit/s TDM PON.

optical engineering

The demonstration of &lt;inline-formula&gt;&lt;math display="inline" overflow="scroll"&gt;&lt;mrow&gt;&lt;mn mathvariant="bold"&gt;10&lt;/mn&gt;&lt;mtext&gt; &lt;/mtext&gt;&lt;mtext&gt; &lt;/mtext&gt;&lt;mi&gt;Gbit&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mi mathvariant="normal"&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/inline-formula&gt; time division multiplexing and &lt;inline-formula&gt;&lt;math display="inline" overflow="scroll"&gt;&lt;mrow&gt;&lt;mn mathvariant="bold"&gt;2.5&lt;/mn&gt;&lt;mtext&gt; &lt;/mtext&gt;&lt;mtext&gt; &lt;/mtext&gt;&lt;mi&gt;Gchip&lt;/mi&gt;&lt;mo&gt;/&lt;/mo&gt;&lt;mi mathvariant="normal"&gt;s&lt;/mi&gt;&lt;/mrow&gt;&lt;/math&gt;&lt;/inline-formula&gt; quasi-synchronous electrical code division multiplexing access passive optical network prototype system