Complimentary code keying of spectral amplitude coding signals in optical buffering with increased capacity

• Main Authors: Kai-Sheng Chen, Wien Hong
• Format: Article
• Language: English
• Published: SpringerOpen 2020-06-01
• Series: Journal of the European Optical Society-Rapid Publications
• Subjects: Optical packet switching; Spectral amplitude coding (SAC); Complementary code keying (CCK); Optical buffering
• Online Access: http://link.springer.com/article/10.1186/s41476-020-00135-6

Abstract Signal buffering services such as contention resolution and congestion avoidance are essential in optical packet switching networks. In this paper, an optical memory scheme based on spectral amplitude coding (SAC) and complementary code keying (CCK) is proposed to increase the buffer capacity. CCK is applied to packet buffering by selecting an available code set and encoding the payload bits with either an SAC signal or its complementarity. The capacity constraint is effectively released, as the usable codes for queuing packets are twice those for the conventional code-domain buffers. To minimize system costs by reducing the codec number, a shared structure based on an arrayed waveguide grating (AWG), which is capable of processing both the typical and complimentary coded signals simultaneously, is also investigated.