Abstract
We present the first experimental demonstration and characterization of the application of optical physical-layer network coding in coherent optical OFDM systems. It combines two optical OFDM frames to share the same link so as to enhance system throughput, while individual OFDM frames can be recovered with digital signal processing at the destined node.
Highlights
With the drastic growth in network traffic, spectrum efficient communication technique is highly desirable
Orthogonal frequency division multiplexing (OFDM) technique has been widely recognized as a promising approach to support high-speed optical fiber transmission, owing to its high and flexible spectrum efficiency in both optical and electronic domains, as well as the robustness in combating chromatic dispersion (CD) and polarization mode dispersion (PMD) in optical fiber
In order to improve the practicality of network coding in optical networks, we propose to perform optical physicallayer network coding (OPNC) in which the two input optical signals are optically combined at the intermediate network node so as to share the same output fiber link for throughput enhancement, and let the destined nodes do the signal separation and recovery process, via electronic digital processing algorithms
Summary
With the drastic growth in network traffic, spectrum efficient communication technique is highly desirable. In order to improve the practicality of network coding in optical networks, we propose to perform optical physicallayer network coding (OPNC) in which the two input optical signals are optically combined at the intermediate network node so as to share the same output fiber link for throughput enhancement, and let the destined nodes do the signal separation and recovery process, via electronic digital processing algorithms The feasibility of this approach has been confirmed by the previously reported works on applying OPNC to optical data frames in onoff keying format [4], as well as in direct-detection OFDM format [5].
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