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Open AccessLetter

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

1
School of Electrical and Computer Engineering, Nanfang College of Sun Yat-Sen University, Guangzhou 510970, China
2
Department of Information Management, Tainan University of Technology, Tainan 71002, Taiwan
*
Author to whom correspondence should be addressed.
Electronics 2019, 8(10), 1117; https://doi.org/10.3390/electronics8101117
Received: 27 September 2019 / Accepted: 2 October 2019 / Published: 3 October 2019
(This article belongs to the Special Issue Optical Communications and Networks)
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.
Keywords: optical switching network (OPS); optical code-division multiple access (OCDMA); spectral-amplitude coding (SAC); two-code keying (TCK); optical buffer optical switching network (OPS); optical code-division multiple access (OCDMA); spectral-amplitude coding (SAC); two-code keying (TCK); optical buffer
MDPI and ACS Style

Chen, K.-S.; Chen, C.-S.; Wu, X.-L. Two-Code Keying and Code Conversion for Optical Buffer Design in Optical Packet Switching Networks. Electronics 2019, 8, 1117.

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