Abstract
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.
Highlights
Optical packet switching (OPS) is a primary technique to realize all-optical networks with sufficient data capacity [1,2,3]
The application of two-code keying (TCK) in an optical code-division multiple access (OCDMA)-based buffer in OPS networks was investigated in this application
The number ofofqueued in the proposed buffer was increased byinvestigated assigning packets paper
Summary
Optical packet switching (OPS) is a primary technique to realize all-optical networks with sufficient data capacity [1,2,3]. Contention resolution and packet buffering should be performed while the packets are being routed Electrical buffering schemes, such as random access memory (RAM), have yet to be maturely implemented in the optical domain [4,5]. TCK encodes distinct codes on the optical spectrum according to the values of data bits [15,16,18] This scheme was initially used in optical access networks to enhance communication security and increase the system signal-to-noise ratio (SNR). Contention resolution is performed as all N delayed packets can be multiplexed in a single output channel without interference In this scheme, packets cannot be stored contiguously in time as each FDL only provides a discrete delay.
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