Novel Scheme of Multi-Rate Quasi-synchronous Coherent Time-spreading OCDMA System
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Jianhua Ji
and
Zhengfeng Xiao
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, the aperiodic cross-correlation of OVSF with a zero-correlation zone equals zero. Therefore, multiple-access interference and beat noise can be removed in multirate quasi-synchronous coherent time-spreading OCDMA system, and the near-far problem can also be eliminated. Simulation of eight simultaneous users with 2.5 Gbit/s, 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. The results show that OVSF codes with a zero-correlation zone can be employed to multi-rate quasi-synchronous coherent time-spreading OCDMA system.
Copyright © 2011 De Gruyter
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Articles in the same Issue
- Editorial
- A Method to Measure Optical Parameters of the Diffraction Grating Using the Ratio of ±1 Orders Diffraction Efficiencies
- The Exact Planning of the GMPLS-based Metro Core Network
- A New TH-CDMA Scheme for Dispersive Infrared Channel and Its Performance Evaluation
- Performance Comparison of BB84 and B92 Satellite-Based Free Space Quantum Optical Communication Systems in the Presence of Channel Effects
- Performance Analysis of Free Space Optical Systems in the Presence of Channel Physical Limitations
- Power Assigning Method for Increasing the Number of Users in Time-spreading Optical CDMA Systems
- Novel Scheme of Multi-Rate Quasi-synchronous Coherent Time-spreading OCDMA System
- Information Processing with Length Intervals of Stationary Random Point Processes
- News
