Performance enhancement of optical code-division multiple-access systems using transposed modified Walsh code

Somali Sikder; Shila Ghosh

doi:10.1117/1.OE.57.2.026114

22 February 2018 Performance enhancement of optical code-division multiple-access systems using transposed modified Walsh code

Somali Sikder, Shila Ghosh

Author Affiliations +

Optical Engineering, Vol. 57, Issue 2, 026114 (February 2018). https://doi.org/10.1117/1.OE.57.2.026114

Abstract

This paper presents the construction of unipolar transposed modified Walsh code (TMWC) and analysis of its performance in optical code-division multiple-access (OCDMA) systems. Specifically, the signal-to-noise ratio, bit error rate (BER), cardinality, and spectral efficiency were investigated. The theoretical analysis demonstrated that the wavelength-hopping time-spreading system using TMWC was robust against multiple-access interference and more spectrally efficient than systems using other existing OCDMA codes. In particular, the spectral efficiency was calculated to be 1.0370 when TMWC of weight 3 was employed. The BER and eye pattern for the designed TMWC were also successfully obtained using OptiSystem simulation software. The results indicate that the proposed code design is promising for enhancing network capacity.

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Somali Sikder and Shila Ghosh "Performance enhancement of optical code-division multiple-access systems using transposed modified Walsh code," Optical Engineering 57(2), 026114 (22 February 2018). https://doi.org/10.1117/1.OE.57.2.026114

Received: 30 July 2017; Accepted: 26 January 2018; Published: 22 February 2018

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