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Study of Phase Modulations With Dual-Balanced Detection in Coherent Homodyne Optical CDMA Network

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2 Author(s)
Karbassian, M.M. ; Dept. of Electron., Electr. & Comput. Eng., Univ. of Birmingham, Birmingham ; Ghafouri-Shiraz, H.

In this paper, we examine the performance of two different phase modulation methods in coherent optical code-division multiple-access (OCDMA) systems. As optical spreading sequences, a recently introduced prime code family hereby referred to as double-padded modified prime code has been employed and analyzed. The OCDMA system operates under synchronous homodyne dual-balanced detection scheme. In this analysis, binary phase-shift keying format is deployed where the phase is modulated by either a Mach-Zehnder interferometer external phase-modulator or an injection-locking of distributed feedback laser diode's driving current. The performances of the two phase-modulation techniques in the presence of multiple-access interferences in a shot-noise limited regime are studied. Phase limitations and reasonable consequence associated with the limited phase excursion are also investigated.

Published in:

Lightwave Technology, Journal of  (Volume:26 ,  Issue: 16 )

Date of Publication:

Aug.15, 2008

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