Title :
Research on multi-rate quasi-synchronous coherent time-spreading OCDMA system
Author :
Zhengfeng Xiao ; Jianhua Ji ; Ming Xu ; Shuwen Yang
Author_Institution :
Adv. Technol. Res. Center, Shenzhen Univ., Shenzhen, China
Abstract :
We propose a novel scheme of multi-rate quasi-synchronous coherent time-spreading OCDMA system, employing orthogonal variable spreading factor (OVSF) codes with a zero-correlation zone. Within permissible time delay, multiple-access interference and beat noise can be removed in multi-rate quasi-synchronous coherent time-spreading OCDMA system, and the near-far problem can also be eliminated. Simulation of eight simultaneous users with 1.25 Gbit/s and 0.625 Gbit/s is demonstrated, where the fiber link consists of 20 km single-mode fiber, plus 2 km Dispersion Compensating Fiber.
Keywords :
code division multiple access; interference suppression; light interference; optical fibre networks; orthogonal codes; OVSF codes; beat noise removal; bit rate 0.625 Gbit/s; bit rate 1.25 Gbit/s; coherent time-spreading OCDMA system; dispersion compensating fiber; fiber link; multiple-access interference; multirate quasisynchronous OCDMA system; near-far problem; orthogonal variable spreading factor codes; single-mode fiber; size 2 km; size 20 km; zero-correlation zone; OCDMA; OVSF; aperiodic cross-correlation; optical communication;
Conference_Titel :
Optical Communications and Networks (ICOCN 2010), 9th International Conference on
Conference_Location :
Nanjing
DOI :
10.1049/cp.2010.1172
