Transmission performance of all-optically labelled packets using ASK/DPSK orthogonal modulation

Orthogonal ASK/DPSK labeling, which encodes label information on optical carriers in a modulation format, is regarded as a competing scheme to subcarrier multiplexed optical labeling. However, the inherent cross-talk limits the extinction ratio (ER) of the payload and label sensitivity. In this paper, two optical coding methods-Manchester coding and 8B10B coding-which can remarkably improve the system quality to obtain acceptable ER are discussed. A novel optical packet encoding methodmark-insertion coding-is demonstrated to significantly reduce cross-talk between the amplitude shift keying (ASK) payload and the differential phase shift keying (DPSK) label through spectrum shaping. The performance of mark-insertion coding depends on the number of inserted 'marks'. Finally, the transmission over a 40 km single mode fiber (SMF) is compared with optical label swapping for a 40 Gbit/s ASK payload and 2.5 Gbit/s DPSK label under these coding schemes. The experimental result is consistent with the theoretical analysis.

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Improved optical coding method for orthogonal ASK/DPSK modulation format

Wang

Liu

et al. 2008

Front. Optoelectron. China

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Improve the performance of orthogonal ASK/DPSK optical label switching by DC-balanced line encoding

Chi

Zhang

et al. 2006

J. Lightwave Technol.

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Abstract-Orthogonal amplitude shift keying/differential phase-shift keying (ASK/DPSK) labeling is a promising approach to ultrahigh packet-rate routing and forwarding in the optical layer. However, the limitation on the payload extinction ratio (ER) is a detrimental effect for network scalability and transparency. This paper presents theoretical and experimental studies of ASK/ DPSK labeling. It proposes that dc-balanced 8B10B coding can greatly improve ER tolerance, which in turn leads to better system performance. By using the 8B10B coding method, the paper demonstrates transmission and optical label swapping for a 40 Gb/s ASK payload and a 2.5 Gb/s DPSK label with an overall power penalty of 3.3 dB for the payload and 0.3 dB for the label. The experimental results also show that the ER is allowed to be as high as 12 dB.Index Terms-Amplitude shift keying, differential phase shift keying, optical label switching, orthogonal modulation.

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All-Optical Label Swapping Using Bistable Semiconductor Ring Laser in an Optical Switching Node

Thakulsukanant

Memon

et al. 2009

J. Lightwave Technol.

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Transmission performance of all-optically labelled packets using ASK/DPSK orthogonal modulation

Cited by 6 publications

References 1 publication

Improved optical coding method for orthogonal ASK/DPSK modulation format

Improved optical coding method for orthogonal ASK/DPSK modulation format

Improve the performance of orthogonal ASK/DPSK optical label switching by DC-balanced line encoding

All-Optical Label Swapping Using Bistable Semiconductor Ring Laser in an Optical Switching Node

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