| 摘要 |
<p>A communications network transport node comprising an optical add-drop multiplexer (OADM), comprising optical signal processing apparatus, electrical signal routing apparatus, and a packet switch. Each optical signal processing apparatus comprises an optical input, an optical output, optical-to-electrical (O-E) signal conversion apparatus arranged to receive input optical channel signals and to convert each into an input radio frequency (RF) modulated electrical channel signal, and electrical to optical (E-O) signal conversion apparatus arranged to receive output RF modulated electrical channel signals and to convert each into an output optical channel signal. The electrical signal routing apparatus determines which input RF modulated electrical channel signals are to be dropped, and routes these to the electrical drop outputs, and which are to be transmitted, and routes these to a selected E-O apparatus. The routing apparatus receives further electrical channel signals and routes these to a selected E-O apparatus.</p> |
