Sangjo Park et al. 13 We propose a new optical code division multiple access (OCDMA) scheme for reducing multiple access interference (MAI) and enhancing performance for optical subscriber access networks using modified pseudorandom noise (PN)-coded fiber Bragg gratings with bipolar OCDMA decoders. Through the bipolar OCDMA decoder and the modified PN codes, MAI among users is effectively depre...

We propose an asynchronous gigabit-symmetric optical code division multiplexing access passive optical network (OCDMA-PON) in which optical network units (ONUs) are source-free. In the experiment, we demonstrate a duplex OCDMA system with a 50 km 10 Gbit/s/user 4-user DPSK-OCDMA downlink and a 50 km 10 Gbit/s/user 4-user OOK-OCDMA uplink and error-free duplex transmissions are achieved. Besides...

Problem statement: Hybrid Optical Code-Division Multiple-Access (OCDMA) and Wavelength-Division Multiplexing (WDM) have flourished as successful schemes for expanding the transmission capacity as well as enhancing the security for OCDMA. However, a comprehensive review related to this hybrid system are lacking currently. Approach: The purpose of this paper is to review the literature on OCDMA-W...

We present the architecture and code design for a highly scalable, 2.5 Gb/s per user optical code division multiple access (OCDMA) system. The system is scalable to 100 potential and more than 10 simultaneous users, each with a bit error rate (BER) of less than 10. The system architecture uses a fast wavelength-hopping, time-spreading codes. Unlike frequency and phase sensitive coherent OCDMA s...

We compare the achievable load of three types of overloaded signature sets with multistage successive interference cancellation: random spreading (PN), WelchBound-Equality (WBE) sequences and overall permuted OCDMA/OCDMA (o-O/O) or PseudoNoise/OCDMA (PN/O). It is found that o-O/O outperforms PN and WBE for spreading factors N, varying from 16 to 256.

The performance comparison of different OCDMA schemes is addressed in this paper. As the result, the merits of coherent 1-D time-spreading and spectral coding schemes and incoherent 2-D scheme are highlighted. The keys towards practical OCDMA networks are discussed in terms of en/decoder, optical sources, optical thresholding as well as multiple access interferences and beat noise suppression. ...

This paper focuses on the effect on BER, Q-Factor for a four user OCDMA communication system with varying Jitter. Performance of the OCDMA communication system has been evaluated in terms of bit error rate and Q factor with jitter varying from 0 pico-seconds to 3.0 picoseconds in steps of 0.5 pico-seconds. Simulations were carried out using commercially available simulator from Rsoft, OPTSIM. K...