Time domain OCDMA PON architecture for 2048 optical network units

Optical code-division multiple access (OCDMA) is one of the alternatives to time-division multiple access (TDM) and wavelength-division multiple (WDM) access in passive optical network (PON) systems as in this multiple users can share the same channel at the same time by assigning different codes to each user. This paper presents basic architecture, working principle, advantage, and disadvantage of the OCDMA system in details. Next, Time domain OCDMA PON architecture for 2048 optical network units (ONUs) at 60 km reach at 2.5 Gb/s bit rate is proposed. The simulated model is investigated for different number of users and transmission distance in terms of BER and Q-factor. The result shows that the simulated model can support up to 2048 users with acceptable BER and Q-factor. Also, multi-access interference effect on proposed architecture is studied. The simulation is carried out using Optsim.

[1]  A.E. Willner,et al.  Advanced Techniques to Increase the Number of Users and Bit Rate in OCDMA Networks , 2007, IEEE Journal of Selected Topics in Quantum Electronics.

[2]  Miloslav Filka,et al.  Simulation of bidirectional traffic in WDM-PON networks , 2014 .

[3]  N. Wada,et al.  Reconfigurable time domain spectral phase encoding/decoding scheme using fibre Bragg gratings for two-dimensional coherent OCDMA , 2008, 2008 34th European Conference on Optical Communication.

[4]  Paul R. Prucnal,et al.  Spread spectrum fiber-optic local area network using optical processing , 1986 .

[5]  S. B. Deosarkar,et al.  Design and Performance Analysis of Eight Users 2-D and Spectral Phase Encoding O-CDMA time Domain Systems , 2012 .

[6]  P. Petropoulos,et al.  Reduction of Multiple Access Interference in a DS-OCDMA System via Two-Photon Absorption , 2007, OFC/NFOEC 2007 - 2007 Conference on Optical Fiber Communication and the National Fiber Optic Engineers Conference.

[7]  Edward H. Sargent,et al.  The role of optical CDMA in access networks , 2002 .

[8]  Naoya Wada,et al.  Spectral phase encoding of ultra-short optical pulse in time domain for OCDMA application. , 2007, Optics express.

[9]  K. Kitayama,et al.  OCDMA over WDM PON-solution path to gigabit-symmetric FTTH , 2006, Journal of Lightwave Technology.

[10]  Xu Wang,et al.  Analysis of beat noise in coherent and incoherent time-spreading OCDMA , 2004, Journal of Lightwave Technology.

[11]  Zhensen Gao,et al.  Demonstration of time-domain spectral phase encoding/DPSK data modulation using single phase modulator , 2009, 2009 IEEE/LEOS Summer Topical Meeting.