Two-Code Keying and Code Conversion for Optical Buffer Design in Optical Packet Switching Networks

• Main Authors: Kai-Sheng Chen, Chien-Sheng Chen, Xiao-Lu Wu
• Format: Article
• Language: English
• Published: MDPI AG 2019-10-01
• Series: Electronics
• Subjects: optical switching network (ops); optical code-division multiple access (ocdma); spectral-amplitude coding (sac); two-code keying (tck); optical buffer
• Online Access: https://www.mdpi.com/2079-9292/8/10/1117

Buffering management is a crucial function in current optical packet switching (OPS) networks. To avoid packet blocking due to competition for the same switched path, optical buffering is required to queue packets after a router makes the forwarding decision. In this paper, the author proposed a buffering scheme based on optical code-division multiple access (OCDMA), where each packet is encoded with an optical signature code. An optical coding technique combining spectral-amplitude coding (SAC) and two-code keying (TCK) is introduced to advance the buffering performance regarding packet loss probability. In TCK, the payload bits “1” and “0” of a stored packet are respectively converted to a SAC signal and its complementarity. As the Hamming distance between the coding signals of bits “1” and “0” is extended, the existing drawback that the OCDMA-based buffer capacity is limited by the decoder noise increased with the number of queued SAC packets is resolved. Moreover, an encoder consisting of a fiber Bragg grating (FBG) array is applied for simplifying the system design. A SAC signal and its complementary counterpart can be generated simultaneously without the need of an extra encoder.