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Reflection Induced Degradations in Optical Fiber Feeder for Microcellular Mobile Radio Systems
Makoto SHIBUTANI Wataru DOMON Katsumi EMURA
IEICE TRANSACTIONS on Electronics
Publication Date: 1993/02/25
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)
Category: Fiber Optic Radio Links
subcarrier multiplexed (SCM) optical transmission, mobile radio, optical reflection, noise, distortion,
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This paper reports the influence of optical reflection induced noise and distortion for optical fiber feeder systems for microcellular mobile communication systems. Since the optical feeder requires very wide dynamic range, noise and distortion must be suppressed to an extremely low level. From optical transmission experiments and theoretical analysis, the basic characteristics of the reflection induced noise and distortion were investigated. By using these results, it was estimated that, for currently used analog mobile telephone systems, the number of connectors with 35 dB reflectance must be limited to less than 17, in order to suppress the noise caused by the connector reflections. Moreover, it was confirmed that the reflection induced distortion drastically decreases according to the increase of the length between reflectors. Therefore, the distortion can be suppressed by expanding the connector spacing to more than 7 meters.