Spectrally compact optical subcarrier multiplexing with 42.6 Gbit/s AM-PSK payload and 2.5 Gbit/s NRZ labels

We propose an RF tone in-band labeling technique that is able to support large-scale and low-latency optical packet switch. This approach is based on N in-band wavelengths, each carrying M radio frequency (RF) tones. The wavelengths and the tones have a binary value, and are able to encode 2 N M possible routing address. We develop an optical label processor for the RF tone in-band optical label based on parallel and asynchronous processing. It allows the optical packet switch with an exponential increase of number of ports at the expense of limited increase in the latency and the complexity. By using RF tone in-band labeling technique, we demonstrate error free (bit error rate 10 9 ) optical packet switching operation for both 160 Gb/s packets and 40 Gb/s packets. We further investigate the scalability, the latency and the optical power fluctuation tolerance of the proposed RF tone in-band labeling technique. We show that 30 label bits are able to be delivered using single in-band wavelength, and the label processor introduces an extra latency of less than 7 ns.Index Terms-Label processor, optical labeling, optical packet switching, RF tone in-band label.

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FPGA-Based Label Processor for Low Latency and Large Port Count Optical Packet Switches

Calabretta

2012

J. Lightwave Technol.

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We present a field-programmable gate array (FPGA)-based label processor for in-band optical labels with a processing time independent of the number of label bits. This allows for implementing an optical packet switching architecture that scales to a large port count without compromising the latency. As a proof of concept, we have employed an FPGA board with 100 MHz clock to validate the operation of the label processor in a 160 Gb/s optical packet switching system. Experimental results show successful three label bits processing and 160 Gb/s packets switching with 1 dB power penalty and 470 ns of latency. Projections on the label processor performance by using more powerful FPGAs indicate that 60 label bits ( optical addresses) can be processed within 31 ns.Index Terms-Data centers (DCs), label processing, optical interconnects, optical packet switching.

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Spectrally compact optical subcarrier multiplexing with 42.6 Gbit/s AM-PSK payload and 2.5 Gbit/s NRZ labels

Cited by 4 publications

References 6 publications

FPGA based controller for large port count optical packet switches

FPGA based controller for large port count optical packet switches

Optical RF Tone In-Band Labeling for Large-Scale and Low-Latency Optical Packet Switches

FPGA-Based Label Processor for Low Latency and Large Port Count Optical Packet Switches

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