All-Optical Access Node Technologies
All-optical switching technologies could lead to increased flexibility of communication networks by overcoming electronic bottlenecks and opto-electronic conversions. The combination of soliton transmission, ultrafast header processing and all-optical demultiplexing permits a routing service on a frame-by-frame basis, which might provide cost savings to high-speed networks by reducing the reliance on expensive SONET add/drop multiplexers. Also, the single channel speeds approaching 100Gb/s could be used to upgrade each channel in a wavelength-division-multiplexed network. A soliton ring network architecture is described that exploits the speeds of all-optical technologies, and the key enabling sub-systems are the access nodes or “on-” and “off-ramps” operating at 100Gb/s. Packet-drop function for a time-division multiplexing network using 100 Gbit/s, eight-bit words is experimentally demonstrated by integrating all-optical header processing and payload demultiplexing with electro-optic packet routing. The header processor consists of two levels of all-optical logic gates based on low birefringent nonlinear optical loop minors (NOLMs), and the payload demultiplexer is a two-wavelength NOLM. Synchronized lasers with timing jitter under 1 ps drive both devices. The contrast ratios for both header processor and demultiplexer are 10:1 and that of the packet router is 17 dB. The switching energies for header processing and payload reading are 10 pJ/pulse and 1 pJ/pulse, respectively. In addition, to test the system performance we experimentally measure the eye diagram of an all-optical header processor using a cross-correlator to achieve picosecond resolution. By varying 100 Gbit/s header packets, we measure an eye diagram with a Q value of 7.1 at 12 pJ packet pulse energy. From the Q value, we also statistically calculate the potential bit-error rate performance of 7х10-13 with a confidence level of 95%. The major challenges for ultrafast, all-optical networks include power requirements, timing jitter, and avoidance of pulse distortion.
KeywordsContrast Ratio Timing Jitter Access Node Slave Laser Management Node
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