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Impact and Mitigation of Noise in Optical 2D Techniques Using (n, w, λa, λc) Optical Orthogonal Codes for Optical CDMA

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Title Impact and Mitigation of Noise in Optical 2D Techniques Using (n, w, λa, λc) Optical Orthogonal Codes for Optical CDMA
 
Creator Bharti, Manisha
 
Subject Optical orthogonal codes
Multiple access interference
SQC/OCC
PC
SPS
Optical hard limiter (OHL)
Coherent detection
 
Description 586-594
The performance of two dimensional (2D) hybrid wavelength/time optical code division multiple access (OCDMA)
system is affected severely by the presence of noise at its physical layer. This noise is present in the guise of multiple access
interference (MAI) and beat noise in OCDMA systems and degrades its performance. In this paper an attempt has been
made to analyze the impact of noise in OCDMA system using four different coding schemes. The mitigation of noise is then
done by using either optical hard limiter (OHL) or by utilizing coherent detection for all these schemes. These codes use
synchronized quadratic congruence sequences (SQC), synchronized prime procession (SPP), prime code sequences (PC) and
synchronized prime sequences (SPS) for wavelength hopping and (n, w, λa, λc) one dimensional optical orthogonal codes for
time spreading respectively. The code with heavier code weight or lower values of auto- and cross- correlation function
performs the best with noise mitigation techniques. Investigations reveal that SQC/OOC coding scheme in combination with
OHL and PC/OOC scheme in combination with coherent detection outperforms in comparison to other techniques.
 
Date 2021-08-23T11:27:49Z
2021-08-23T11:27:49Z
2021-08
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscair.res.in/handle/123456789/57935
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJPAP Vol.59(08) [August 2021]