Major Factors Affecting Fiber-Optic Transmission System Design for Radio Base Stations

Toshiyuki TSUCHIYA  Takashi SHIRAISHI  Junro ARATA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E76-B   No.9   pp.1136-1144
Publication Date: 1993/09/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Fiber-optic Microcelluler Radio Communication System and Their Technologies)
Category: Equipment and Device Matters
Keyword: 
optical interferometric deterioration,  hypothetical return loss model,  self-tuning type WDM,  radio base station,  

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Summary: 
A fiber-optic transmission system for linking radio base stations to the mobile communication center is developed, and its performance is evaluated. The introduction of this system yields two main improvements: optimum zone allocation to increase radio frequency utilization efficiency and the elimination of service quality issues such as dead zones and traffic imbalance. Being optical, the system suffers from the interferometric noise and distortion created by multiple reflections within the fiber. Moreover, because system response is much different from that of optical CATV systems, we clarify the optical parameter selection criteria and hypothetical return loss model for an embedded fiber infrastructure. An optical multiplexing method is also introduced that reduces the quantity of fiber and connectors, as well as splicing and cable installation costs. A new ternary optical multiplexing architecture combined with a cost-effective self-tuning type WDM technique and a high isolation type circulator are proposed for the 1.3µm wavelength region. The performance of low distortion high power common amplifiers is measured with the aim of reducing the size and weight of back-up batteries, and to improve the packaging density of the typical base station.